# QueryableExtensions.SumAsync Method

## Definition

Important

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## Overloads

SumAsync(IQueryable<Int32>, CancellationToken) |
Asynchronously computes the sum of a sequence of Int32 values. |

SumAsync(IQueryable<Int64>, CancellationToken) |
Asynchronously computes the sum of a sequence of Int64 values. |

SumAsync(IQueryable<Nullable<Decimal>>, CancellationToken) |
Asynchronously computes the sum of a sequence of nullable Decimal values. |

SumAsync(IQueryable<Nullable<Single>>, CancellationToken) |
Asynchronously computes the sum of a sequence of nullable Single values. |

SumAsync(IQueryable<Nullable<Int32>>, CancellationToken) |
Asynchronously computes the sum of a sequence of nullable Int32 values. |

SumAsync(IQueryable<Single>, CancellationToken) |
Asynchronously computes the sum of a sequence of Single values. |

SumAsync(IQueryable<Double>, CancellationToken) |
Asynchronously computes the sum of a sequence of Double values. |

SumAsync(IQueryable<Nullable<Double>>, CancellationToken) |
Asynchronously computes the sum of a sequence of nullable Double values. |

SumAsync(IQueryable<Decimal>, CancellationToken) |
Asynchronously computes the sum of a sequence of Decimal values. |

SumAsync(IQueryable<Nullable<Int64>>, CancellationToken) |
Asynchronously computes the sum of a sequence of nullable Int64 values. |

SumAsync(IQueryable<Nullable<Single>>) |
Asynchronously computes the sum of a sequence of nullable Single values. |

SumAsync(IQueryable<Single>) |
Asynchronously computes the sum of a sequence of Single values. |

SumAsync(IQueryable<Double>) |
Asynchronously computes the sum of a sequence of Double values. |

SumAsync(IQueryable<Int32>) |
Asynchronously computes the sum of a sequence of Int32 values. |

SumAsync(IQueryable<Int64>) |
Asynchronously computes the sum of a sequence of Int64 values. |

SumAsync(IQueryable<Decimal>) |
Asynchronously computes the sum of a sequence of Decimal values. |

SumAsync(IQueryable<Nullable<Double>>) |
Asynchronously computes the sum of a sequence of nullable Double values. |

SumAsync(IQueryable<Nullable<Int32>>) |
Asynchronously computes the sum of a sequence of nullable Int32 values. |

SumAsync(IQueryable<Nullable<Int64>>) |
Asynchronously computes the sum of a sequence of nullable Int64 values. |

SumAsync(IQueryable<Nullable<Decimal>>) |
Asynchronously computes the sum of a sequence of nullable Decimal values. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>, CancellationToken) |
Asynchronously computes the sum of the sequence of Single values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>, CancellationToken) |
Asynchronously computes the sum of the sequence of nullable Single values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>, CancellationToken) |
Asynchronously computes the sum of the sequence of nullable Int64 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>, CancellationToken) |
Asynchronously computes the sum of the sequence of nullable Int32 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>, CancellationToken) |
Asynchronously computes the sum of the sequence of nullable Double values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>, CancellationToken) |
Asynchronously computes the sum of the sequence of nullable Decimal values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>, CancellationToken) |
Asynchronously computes the sum of the sequence of Int64 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>, CancellationToken) |
Asynchronously computes the sum of the sequence of Int32 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>, CancellationToken) |
Asynchronously computes the sum of the sequence of Decimal values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>, CancellationToken) |
Asynchronously computes the sum of the sequence of Double values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) |
Asynchronously computes the sum of the sequence of nullable Single values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) |
Asynchronously computes the sum of the sequence of nullable Int64 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) |
Asynchronously computes the sum of the sequence of nullable Int32 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) |
Asynchronously computes the sum of the sequence of nullable Double values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) |
Asynchronously computes the sum of the sequence of nullable Decimal values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) |
Asynchronously computes the sum of the sequence of Int64 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) |
Asynchronously computes the sum of the sequence of Int32 values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) |
Asynchronously computes the sum of the sequence of Double values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) |
Asynchronously computes the sum of the sequence of Decimal values that is obtained by invoking a projection function on each element of the input sequence. |

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) |
Asynchronously computes the sum of the sequence of Single values that is obtained by invoking a projection function on each element of the input sequence. |

## SumAsync(IQueryable<Int32>, CancellationToken)

Asynchronously computes the sum of a sequence of Int32 values.

`public static System.Threading.Tasks.Task<int> SumAsync (this System.Linq.IQueryable<int> source, System.Threading.CancellationToken cancellationToken);`

`static member SumAsync : System.Linq.IQueryable<int> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<int>`

#### Parameters

- source
- IQueryable<Int32>

A sequence of Int32 values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

A task that represents the asynchronous operation. The task result contains the sum of the values in the sequence.

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.

### Applies to

## SumAsync(IQueryable<Int64>, CancellationToken)

Asynchronously computes the sum of a sequence of Int64 values.

`public static System.Threading.Tasks.Task<long> SumAsync (this System.Linq.IQueryable<long> source, System.Threading.CancellationToken cancellationToken);`

`static member SumAsync : System.Linq.IQueryable<int64> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<int64>`

#### Parameters

- source
- IQueryable<Int64>

A sequence of Int64 values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

A task that represents the asynchronous operation. The task result contains the sum of the values in the sequence.

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.

### Applies to

## SumAsync(IQueryable<Nullable<Decimal>>, CancellationToken)

Asynchronously computes the sum of a sequence of nullable Decimal values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<decimal>> SumAsync (this System.Linq.IQueryable<Nullable<decimal>> source, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<decimal>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<decimal>>`

#### Parameters

- source
- IQueryable<Nullable<Decimal>>

A sequence of nullable Decimal values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

A task that represents the asynchronous operation. The task result contains the sum of the values in the sequence.

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.

### Applies to

## SumAsync(IQueryable<Nullable<Single>>, CancellationToken)

Asynchronously computes the sum of a sequence of nullable Single values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<float>> SumAsync (this System.Linq.IQueryable<Nullable<float>> source, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<single>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<single>>`

#### Parameters

- source
- IQueryable<Nullable<Single>>

A sequence of nullable Single values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Int32>>, CancellationToken)

Asynchronously computes the sum of a sequence of nullable Int32 values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<int>> SumAsync (this System.Linq.IQueryable<Nullable<int>> source, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<int>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<int>>`

#### Parameters

- source
- IQueryable<Nullable<Int32>>

A sequence of nullable Int32 values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync(IQueryable<Single>, CancellationToken)

Asynchronously computes the sum of a sequence of Single values.

`public static System.Threading.Tasks.Task<float> SumAsync (this System.Linq.IQueryable<float> source, System.Threading.CancellationToken cancellationToken);`

`static member SumAsync : System.Linq.IQueryable<single> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<single>`

#### Parameters

- source
- IQueryable<Single>

A sequence of Single values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Double>, CancellationToken)

Asynchronously computes the sum of a sequence of Double values.

`public static System.Threading.Tasks.Task<double> SumAsync (this System.Linq.IQueryable<double> source, System.Threading.CancellationToken cancellationToken);`

`static member SumAsync : System.Linq.IQueryable<double> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<double>`

#### Parameters

- source
- IQueryable<Double>

A sequence of Double values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Double>>, CancellationToken)

Asynchronously computes the sum of a sequence of nullable Double values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<double>> SumAsync (this System.Linq.IQueryable<Nullable<double>> source, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<double>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<double>>`

#### Parameters

- source
- IQueryable<Nullable<Double>>

A sequence of nullable Double values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Decimal>, CancellationToken)

Asynchronously computes the sum of a sequence of Decimal values.

`public static System.Threading.Tasks.Task<decimal> SumAsync (this System.Linq.IQueryable<decimal> source, System.Threading.CancellationToken cancellationToken);`

`static member SumAsync : System.Linq.IQueryable<decimal> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<decimal>`

#### Parameters

- source
- IQueryable<Decimal>

A sequence of Decimal values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Int64>>, CancellationToken)

Asynchronously computes the sum of a sequence of nullable Int64 values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<long>> SumAsync (this System.Linq.IQueryable<Nullable<long>> source, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<int64>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<int64>>`

#### Parameters

- source
- IQueryable<Nullable<Int64>>

A sequence of nullable Int64 values to calculate the sum of.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Single>>)

Asynchronously computes the sum of a sequence of nullable Single values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<float>> SumAsync (this System.Linq.IQueryable<Nullable<float>> source);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<single>> -> System.Threading.Tasks.Task<Nullable<single>>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Nullable(Of Single))) As Task(Of Nullable(Of Single))
```

#### Parameters

- source
- IQueryable<Nullable<Single>>

A sequence of nullable Single values to calculate the sum of.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Single>)

Asynchronously computes the sum of a sequence of Single values.

`public static System.Threading.Tasks.Task<float> SumAsync (this System.Linq.IQueryable<float> source);`

`static member SumAsync : System.Linq.IQueryable<single> -> System.Threading.Tasks.Task<single>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Single)) As Task(Of Single)
```

#### Parameters

- source
- IQueryable<Single>

A sequence of Single values to calculate the sum of.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Double>)

Asynchronously computes the sum of a sequence of Double values.

`public static System.Threading.Tasks.Task<double> SumAsync (this System.Linq.IQueryable<double> source);`

`static member SumAsync : System.Linq.IQueryable<double> -> System.Threading.Tasks.Task<double>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Double)) As Task(Of Double)
```

#### Parameters

- source
- IQueryable<Double>

A sequence of Double values to calculate the sum of.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Int32>)

Asynchronously computes the sum of a sequence of Int32 values.

`public static System.Threading.Tasks.Task<int> SumAsync (this System.Linq.IQueryable<int> source);`

`static member SumAsync : System.Linq.IQueryable<int> -> System.Threading.Tasks.Task<int>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Integer)) As Task(Of Integer)
```

#### Parameters

- source
- IQueryable<Int32>

A sequence of Int32 values to calculate the sum of.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync(IQueryable<Int64>)

Asynchronously computes the sum of a sequence of Int64 values.

`public static System.Threading.Tasks.Task<long> SumAsync (this System.Linq.IQueryable<long> source);`

`static member SumAsync : System.Linq.IQueryable<int64> -> System.Threading.Tasks.Task<int64>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Long)) As Task(Of Long)
```

#### Parameters

- source
- IQueryable<Int64>

A sequence of Int64 values to calculate the sum of.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync(IQueryable<Decimal>)

Asynchronously computes the sum of a sequence of Decimal values.

`public static System.Threading.Tasks.Task<decimal> SumAsync (this System.Linq.IQueryable<decimal> source);`

`static member SumAsync : System.Linq.IQueryable<decimal> -> System.Threading.Tasks.Task<decimal>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Decimal)) As Task(Of Decimal)
```

#### Parameters

- source
- IQueryable<Decimal>

A sequence of Decimal values to calculate the sum of.

#### Returns

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Double>>)

Asynchronously computes the sum of a sequence of nullable Double values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<double>> SumAsync (this System.Linq.IQueryable<Nullable<double>> source);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<double>> -> System.Threading.Tasks.Task<Nullable<double>>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Nullable(Of Double))) As Task(Of Nullable(Of Double))
```

#### Parameters

- source
- IQueryable<Nullable<Double>>

A sequence of nullable Double values to calculate the sum of.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Int32>>)

Asynchronously computes the sum of a sequence of nullable Int32 values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<int>> SumAsync (this System.Linq.IQueryable<Nullable<int>> source);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<int>> -> System.Threading.Tasks.Task<Nullable<int>>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Nullable(Of Integer))) As Task(Of Nullable(Of Integer))
```

#### Parameters

- source
- IQueryable<Nullable<Int32>>

A sequence of nullable Int32 values to calculate the sum of.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Int64>>)

Asynchronously computes the sum of a sequence of nullable Int64 values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<long>> SumAsync (this System.Linq.IQueryable<Nullable<long>> source);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<int64>> -> System.Threading.Tasks.Task<Nullable<int64>>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Nullable(Of Long))) As Task(Of Nullable(Of Long))
```

#### Parameters

- source
- IQueryable<Nullable<Int64>>

A sequence of nullable Int64 values to calculate the sum of.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync(IQueryable<Nullable<Decimal>>)

Asynchronously computes the sum of a sequence of nullable Decimal values.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<decimal>> SumAsync (this System.Linq.IQueryable<Nullable<decimal>> source);
```

`static member SumAsync : System.Linq.IQueryable<Nullable<decimal>> -> System.Threading.Tasks.Task<Nullable<decimal>>`

```
<Extension()>
Public Function SumAsync (source As IQueryable(Of Nullable(Of Decimal))) As Task(Of Nullable(Of Decimal))
```

#### Parameters

- source
- IQueryable<Nullable<Decimal>>

A sequence of nullable Decimal values to calculate the sum of.

#### Returns

- Attributes

#### Exceptions

`source`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>, CancellationToken)

Asynchronously computes the sum of the sequence of Single values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<float> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,float>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, single>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<single>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Single>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

A task that represents the asynchronous operation. The task result contains the sum of the projected values.

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>, CancellationToken)

Asynchronously computes the sum of the sequence of nullable Single values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<float>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<float>>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<single>>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<single>>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Single>>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

A task that represents the asynchronous operation. The task result contains the sum of the projected values.

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>, CancellationToken)

Asynchronously computes the sum of the sequence of nullable Int64 values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<long>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<long>>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<int64>>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<int64>>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Int64>>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

A task that represents the asynchronous operation. The task result contains the sum of the projected values.

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>, CancellationToken)

Asynchronously computes the sum of the sequence of nullable Int32 values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<int>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<int>>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<int>>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<int>>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Int32>>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>, CancellationToken)

Asynchronously computes the sum of the sequence of nullable Double values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
public static System.Threading.Tasks.Task<Nullable<double>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<double>>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<double>>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<double>>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Double>>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>, CancellationToken)

Asynchronously computes the sum of the sequence of nullable Decimal values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
public static System.Threading.Tasks.Task<Nullable<decimal>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<decimal>>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<decimal>>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Nullable<decimal>>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Decimal>>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>, CancellationToken)

Asynchronously computes the sum of the sequence of Int64 values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<long> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,long>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, int64>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<int64>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Int64>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>, CancellationToken)

Asynchronously computes the sum of the sequence of Int32 values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<int> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,int>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, int>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<int>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Int32>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>, CancellationToken)

Asynchronously computes the sum of the sequence of Decimal values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<decimal> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,decimal>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, decimal>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<decimal>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Decimal>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>, CancellationToken)

Asynchronously computes the sum of the sequence of Double values that is obtained by invoking a projection function on each element of the input sequence.

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<double> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,double>> selector, System.Threading.CancellationToken cancellationToken);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, double>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<double>`

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Double>>

A projection function to apply to each element.

- cancellationToken
- CancellationToken

A CancellationToken to observe while waiting for the task to complete.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<float>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<float>>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<single>>> -> System.Threading.Tasks.Task<Nullable<single>>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Single)))) As Task(Of Nullable(Of Single))
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Single>>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<long>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<long>>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<int64>>> -> System.Threading.Tasks.Task<Nullable<int64>>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Long)))) As Task(Of Nullable(Of Long))
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Int64>>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<int>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<int>>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<int>>> -> System.Threading.Tasks.Task<Nullable<int>>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Integer)))) As Task(Of Nullable(Of Integer))
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Int32>>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<double>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<double>>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<double>>> -> System.Threading.Tasks.Task<Nullable<double>>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Double)))) As Task(Of Nullable(Of Double))
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Double>>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<Nullable<decimal>> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<decimal>>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<decimal>>> -> System.Threading.Tasks.Task<Nullable<decimal>>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Decimal)))) As Task(Of Nullable(Of Decimal))
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Nullable<Decimal>>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<long> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,long>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, int64>> -> System.Threading.Tasks.Task<int64>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Long))) As Task(Of Long)
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Int64>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<int> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,int>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, int>> -> System.Threading.Tasks.Task<int>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Integer))) As Task(Of Integer)
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Int32>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<double> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,double>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, double>> -> System.Threading.Tasks.Task<double>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Double))) As Task(Of Double)
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Double>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<decimal> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,decimal>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, decimal>> -> System.Threading.Tasks.Task<decimal>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Decimal))) As Task(Of Decimal)
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Decimal>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

The number of elements in
`source`

is larger than
MaxValue
.

### Remarks

### Applies to

## SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>)

```
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<float> SumAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,float>> selector);
```

`static member SumAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, single>> -> System.Threading.Tasks.Task<single>`

```
<Extension()>
Public Function SumAsync(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Single))) As Task(Of Single)
```

#### Type Parameters

- TSource

The type of the elements of `source`

.

#### Parameters

- source
- IQueryable<TSource>

A sequence of values of type `TSource`

.

- selector
- Expression<Func<TSource,Single>>

A projection function to apply to each element.

#### Returns

- Attributes

#### Exceptions

`source`

or
`selector`

is
`null`

.

`source`

doesn't implement
IDbAsyncQueryProvider
.

### Remarks

### Applies to

Entity Framework

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