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LabelTarget Class
Used to represent the target of a GotoExpression.
Namespace: System.Linq.Expressions
Assembly: System.Core (in System.Core.dll)
The LabelTarget type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a String that represents the current Object. (Overrides Object.ToString.) |
The following example demonstrates how to create an expression that contains a LabelTarget object by using the Label method.
' Add the following directive to the file: ' Imports System.Linq.Expressions ' A label expression of the void type that is the target for Expression.Return(). Dim returnTarget As LabelTarget = Expression.Label() ' This block contains a GotoExpression that represents a return statement with no value. ' It transfers execution to a label expression that is initialized with the same LabelTarget as the GotoExpression. ' The types of the GotoExpression, label expression, and LabelTarget must match. Dim blockExpr As BlockExpression = Expression.Block( Expression.Call(GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}), Expression.Constant("Return")), Expression.Return(returnTarget), Expression.Call(GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}), Expression.Constant("Other Work")), Expression.Label(returnTarget) ) ' The following statement first creates an expression tree, ' then compiles it, and then runs it. Expression.Lambda(Of Action)(blockExpr).Compile()() ' This code example produces the following output: ' ' Return ' "Other Work" is not printed because ' the Return expression transfers execution from Return(returnTarget) ' to Expression.Label(returnTarget).
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