MethodInfo.IsGenericMethodDefinition Property

Reference

Definition

Namespace:: System.Reflection

Assembly:: mscorlib.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets a value indicating whether the current MethodInfo represents the definition of a generic method.

public:
 virtual property bool IsGenericMethodDefinition { bool get(); };

public override bool IsGenericMethodDefinition { get; }

member this.IsGenericMethodDefinition : bool

Public Overrides ReadOnly Property IsGenericMethodDefinition As Boolean

Property Value

Boolean

true if the MethodInfo object represents the definition of a generic method; otherwise, false.

Examples

The following code example uses the IsGenericMethodDefinition property to display a message indicating whether a MethodInfo represents a generic method definition.

This example is part of a larger example provided for the MakeGenericMethod method.

Console.WriteLine(vbTab _
    & "Is this a generic method definition? {0}", _
    mi.IsGenericMethodDefinition)

Console.WriteLine("\tIs this a generic method definition? {0}",
    mi.IsGenericMethodDefinition);

Console::WriteLine("\tIs this a generic method definition? {0}",
    mi->IsGenericMethodDefinition);

Remarks

If the current MethodInfo represents a generic method definition, then:

IsGenericMethodDefinition returns true.
For each Type object in the array returned by the GetGenericArguments() method:
- The Type.IsGenericParameter property returns true.
- The Type.DeclaringMethod returns the current MethodInfo.
- The Type.GenericParameterPosition property is the same as the position of the Type object in the array.

Use the IsGenericMethodDefinition property to determine whether type arguments have been assigned to the type parameters of a generic method. If type arguments have been assigned, the IsGenericMethodDefinition property returns false even if some of the type arguments are Type objects that represent type parameters of enclosing types. For example, consider the following C#, Visual Basic, and C++ code:

```cs
class C
{
    T N<T,U>(T t, U u) {...}
    public V M<V>(V v)
    {
        return N<V,int>(v, 42);
    }
}
```

```vb
Class C
    Public Function N(Of T,U)(ByVal ta As T, ByVal ua As U) As T
        ...
    End Function
    Public Function M(Of V)(ByVal va As V ) As V
        Return N(Of V, Integer)(va, 42)
    End Function
End Class
```

```cpp
ref class C
{
private:
    generic <typename T, typename U> T N(T t, U u) {...}
public:
    generic <typename V> V M(V v)
    {
        return N<V, int>(v, 42);
    }
};
```

The method body of M contains a call to method N, specifying the type parameter of M and the type Int32. The IsGenericMethodDefinition property returns false for method N<V,int>.

Note

Although the open constructed method N<V,int> is not encountered when reflecting over class C, it must be generated using MakeGenericMethod in order to emit C as a dynamic class.

If a generic method definition includes generic parameters of the declaring type, there will be a generic method definition specific to each constructed type. For example, consider the following C# and Visual Basic code:

```csharp
class B<U,V> {}
class C<T> { public B<T,S> M<S>() {...}}
```

```vb
Class B(Of U, V)
End Class
Class C(Of T)
    Public Function M(Of S)() As B(Of T, S)
        ...
    End Function
End Class
```

```cpp
generic <typename U, typename V> ref class B {};
generic <typename T> ref class C
{
public:
    generic <typename S> B<T,S>^ M() {...};
};
```

In the constructed type C<int> (C(Of Integer) in Visual Basic), the generic method M returns B<int, S>. In the open type C<T>, M returns B<T, S>. In both cases, the IsGenericMethodDefinition property returns true for the MethodInfo that represents M.

For a list of the invariant conditions for terms specific to generic methods, see the IsGenericMethod property. For a list of the invariant conditions for other terms used in generic reflection, see the IsGenericType property.

Applies to

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