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Expression.Default Method

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 static DefaultExpression Default(
	Type type
)

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:
// using System.Linq.Expressions;  

// This expression represents the default value of a type
// (0 for integer, null for a string, etc.)
Expression defaultExpr = Expression.Default(
                            typeof(byte)
                        );

// Print out 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<Func<byte>>(defaultExpr).Compile()());

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


.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

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.
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