Expression.Default Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Creates a DefaultExpression that has the Type property set to the specified type.
Assembly: System.Core (in System.Core.dll)
Parameters
- type
- Type: System.Type
A Type to set the Type property equal to.
Return Value
Type: System.Linq.Expressions.DefaultExpressionA 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. outputBlock.Text &= defaultExpr.ToString() & vbCrLf ' The following statement first creates an expression tree, ' then compiles it, and then executes it. outputBlock.Text &= Expression.Lambda(Of Func(Of Byte))(defaultExpr).Compile()() & vbCrLf ' This code example produces the following output: ' ' default(Byte) ' 0
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