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Expression.Empty Method

Creates an empty expression that has Void type.

Namespace:  System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

public static DefaultExpression Empty()

Return Value

Type: System.Linq.Expressions.DefaultExpression
A DefaultExpression that has the NodeType property equal to Default and the Type property set to Void.

An empty expression can be used where an expression is expected but no action is desired. For example, you can use an empty expression as the last expression in a block expression. In this case, the block expression's return value is void.

The following code example shows how to create an empty expression and add it to a block expression.


       // Add the following directive to your file:
       // using System.Linq.Expressions;  

       // This statement creates an empty expression.
       DefaultExpression emptyExpr = Expression.Empty();

       // The empty expression can be used where an expression is expected, but no action is desired.
       // For example, you can use the empty expression as the last expression in the block expression.
       // In this case the block expression's return value is void.
       var emptyBlock = Expression.Block(emptyExpr);



Silverlight

Supported in: 5, 4

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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