Expression.TypeAs Method (Expression, Type)
.NET Framework (current version)
Creates a UnaryExpression that represents an explicit reference or boxing conversion where null is supplied if the conversion fails.
Assembly: System.Core (in System.Core.dll)
Parameters
- expression
-
Type:
System.Linq.Expressions.Expression
An Expression to set the Operand property equal to.
- type
- Type: System.Type
Return Value
Type: System.Linq.Expressions.UnaryExpressionA UnaryExpression that has the NodeType property equal to TypeAs and the Operand and Type properties set to the specified values.
| Exception | Condition |
|---|---|
| ArgumentNullException | expression or type is null. |
The Method property of the resulting UnaryExpression is null. The IsLifted and IsLiftedToNull properties are both false.
The following example demonstrates how to use the TypeAs(Expression, Type) method to create a UnaryExpression that represents the reference conversion of a non-nullable integer expression to the nullable integer type.
// Create a UnaryExpression that represents a // conversion of an int to an int?. System.Linq.Expressions.UnaryExpression typeAsExpression = System.Linq.Expressions.Expression.TypeAs( System.Linq.Expressions.Expression.Constant(34, typeof(int)), typeof(int?)); Console.WriteLine(typeAsExpression.ToString()); // This code produces the following output: // // (34 As Nullable`1)
Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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