GotoExpression Class
Represents an unconditional jump. This includes return statements, break and continue statements, and other jumps.
Assembly: System.Core (in System.Core.dll)
The GotoExpression type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | CanReduce | Indicates that the node can be reduced to a simpler node. If this returns true, Reduce() can be called to produce the reduced form. (Inherited from Expression.) |
![]() | Kind | The kind of the "go to" expression. Serves information purposes only. |
![]() | NodeType | Returns the node type of this Expression. (Overrides Expression.NodeType.) |
![]() | Target | The target label where this node jumps to. |
![]() | Type | Gets the static type of the expression that this Expression represents. (Overrides Expression.Type.) |
![]() | Value | The value passed to the target, or null if the target is of type System.Void. |
| Name | Description | |
|---|---|---|
![]() | Accept | Dispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall. (Inherited from Expression.) |
![]() | 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 it 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.) |
![]() | Reduce | Reduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression.) |
![]() | ReduceAndCheck | Reduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression.) |
![]() | ReduceExtensions | Reduces the expression to a known node type (that is not an Extension node) or just returns the expression if it is already a known type. (Inherited from Expression.) |
![]() | ToString | Returns a textual representation of the Expression. (Inherited from Expression.) |
![]() | Update | Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression. |
![]() | VisitChildren | Reduces the node and then calls the visitor delegate on the reduced expression. The method throws an exception if the node is not reducible. (Inherited from Expression.) |
The following example demonstrates how to create an expression that contains a GotoExpression object by using the Goto method.
' Add the following directive to your file: ' Imports System.Linq.Expressions ' A label expression of the void type that is the target for the GoToExpression. Dim returnTarget As LabelTarget = Expression.Label() ' This block contains a GotoExpression. ' 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("GoTo")), Expression.Goto(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: ' ' GoTo ' "Other Work" is not printed because ' the Return expression transfers execution from Expression.GoTo(returnTarget) ' to Expression.Label(returnTarget).
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.


