IndexerReference<TOperand,TItem> Class
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Represents an element referenced by an object indexer that can be used as an l-value in an expression.
generic <typename TOperand, typename TItem>
public ref class IndexerReference sealed : System::Activities::CodeActivity<System::Activities::Location<TItem> ^>
[System.Windows.Markup.ContentProperty("Indices")]
public sealed class IndexerReference<TOperand,TItem> : System.Activities.CodeActivity<System.Activities.Location<TItem>>
[<System.Windows.Markup.ContentProperty("Indices")>]
type IndexerReference<'Operand, 'Item> = class
inherit CodeActivity<Location<'Item>>
Public NotInheritable Class IndexerReference(Of TOperand, TItem)
Inherits CodeActivity(Of Location(Of TItem))
- TOperand
The type with the indexer.
- TItem
The type of the indexer array.
- Inheritance
-
CodeActivity<Location<TItem>>IndexerReference<TOperand,TItem>
- Attributes
The following code example uses IndexerReference<TOperand,TItem> in an Assign
activity to assign an integer value to the object item at index [1,2] and prints the item value to the console. The Assign
activity is equivalent to the following statement when using an object that implements an indexer. myObj[1,2] = 4;
.
Obs!
Instead of instantiating the IndexerReference<TOperand,TItem> l-value expression activity directly, it is strongly recommended that you call ConvertReference, which provides a higher level of abstraction and enables you to implement your workflow more intuitively.
// Define a class with a multi-dimensional indexer.
public class ObjectWithIndexer
{
private int[,] array = new int[10,10];
public int this[int i, int j]
{
get { return array[i,j]; }
set { array[i,j] = value; }
}
}
public static void IndexerReferenceSample()
{
// Create a variable of type ObjectWithIndexer to store the object item.
var oivar = new Variable<ObjectWithIndexer>("oivar", new ObjectWithIndexer());
Activity myActivity = new Sequence
{
Variables = { oivar },
Activities =
{
// Create an Assign activity with a reference for the object at index [1,2].
new Assign<int>
{
To = new IndexerReference<ObjectWithIndexer, int>
{
Operand = oivar,
Indices =
{
new InArgument<int>(1),
new InArgument<int>(2)
}
},
// Assign an integer value to the object at index [1,2].
Value = 4,
},
// Print the new item value to the console.
new WriteLine()
{
Text = ExpressionServices.Convert<string>(ctx => oivar.Get(ctx)[1, 2].ToString()),
}
}
};
// Invoke the Sequence activity.
WorkflowInvoker.Invoke(myActivity);
}
Indexer |
Initializes a new instance of the IndexerReference<TOperand,TItem> class. |
Cache |
Gets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity) |
Constraints |
Gets a collection of Constraint activities that can be configured to provide validation for the Activity. (Inherited from Activity) |
Display |
Gets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking. (Inherited from Activity) |
Id |
Gets an identifier that is unique in the scope of the workflow definition. (Inherited from Activity) |
Implementation |
Not supported. (Inherited from CodeActivity<TResult>) |
Implementation |
Gets or sets the implementation version of the activity. (Inherited from CodeActivity<TResult>) |
Indices |
Gets a collection of arguments that represent the indices of the element in the indexer array. |
Operand |
Gets or sets the object that contains the indexer. |
Result |
Gets or sets the result argument for the Activity<TResult>. (Inherited from Activity<TResult>) |
Result |
When implemented in a derived class, gets the type of an activity OutArgument. (Inherited from ActivityWithResult) |
Cache |
Not implemented. Use CacheMetadata(CodeActivityMetadata) instead. (Inherited from CodeActivity<TResult>) |
Cache |
Creates and validates a description of the activity's arguments, variables, child activities, and activity delegates. (Inherited from CodeActivity<TResult>) |
Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
Execute(Code |
When implemented in a derived class, performs the execution of the activity. (Inherited from CodeActivity<TResult>) |
Get |
Serves as the default hash function. (Inherited from Object) |
Get |
Gets the Type of the current instance. (Inherited from Object) |
Memberwise |
Creates a shallow copy of the current Object. (Inherited from Object) |
On |
Raises an event when creating a map for the dynamic update. (Inherited from CodeActivity<TResult>) |
Should |
Indicates whether the DisplayName property should be serialized. (Inherited from Activity) |
To |
Returns a String that contains the Id and DisplayName of the Activity. (Inherited from Activity) |
Produkt | Versjoner |
---|---|
.NET Framework | 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
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