Expression.Default Method (Type)

 
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Creates a DefaultExpression that has the Type property set to the specified type.

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

Public Shared Function Default (
	type As Type
) As DefaultExpression

Parameters

type
Type: System.Type

A Type to set the Type property equal to.

Return Value

Type: System.Linq.Expressions.DefaultExpression

A DefaultExpression that has the NodeType property equal to Default and the Type property set to the specified type.

The following code example shows how to create an expression that represents a default vaule for a given type.

' Add the following directive to your file:
' Imports System.Linq.Expressions  

' This expression represents the default value of a type
' (0 for integer, null for a string, and so on).
Dim defaultExpr As Expression = Expression.Default(
                                        GetType(Byte)
                                    )

' Print the expression.
Console.WriteLine(defaultExpr.ToString())

' The following statement first creates an expression tree,
' then compiles it, and then executes it.
Console.WriteLine(
    Expression.Lambda(Of Func(Of Byte))(defaultExpr).Compile()())

' This code example produces the following output:
'
' default(Byte)
' 0

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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