Represents an expression that applies a delegate or lambda expression to a list of argument expressions.
Assembly: System.Core (in System.Core.dll)
Thetype exposes the following members.
|Arguments||Gets the arguments that the delegate or lambda expression is applied to.|
|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.)|
|Expression||Gets the delegate or lambda expression to be applied.|
|NodeType||Returns the node type of this expression. Extension nodes should return Extension when overriding this method. (Overrides Expression.NodeType.)|
|Type||Gets the static type of the expression that this Expression represents. (Overrides Expression.Type.)|
|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.)|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (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 creates an that represents invoking a lambda expression with specified arguments.
Dim largeSumTest As System.Linq.Expressions.Expression(Of System.Func(Of Integer, Integer, Boolean)) = _ Function(num1, num2) (num1 + num2) > 1000 ' Create an InvocationExpression that represents applying ' the arguments '539' and '281' to the lambda expression 'largeSumTest'. Dim invocationExpression As System.Linq.Expressions.InvocationExpression = _ System.Linq.Expressions.Expression.Invoke( _ largeSumTest, _ System.Linq.Expressions.Expression.Constant(539), _ System.Linq.Expressions.Expression.Constant(281)) Console.WriteLine(invocationExpression.ToString()) ' This code produces the following output: ' ' Invoke((num1, num2) => ((num1 + num2) > 1000),539,281)