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DbExpressionBuilder.CastTo Method

.NET Framework 4.5

Creates a new DbCastExpression that applies a cast operation to a polymorphic argument.

Namespace:  System.Data.Common.CommandTrees.ExpressionBuilder
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public static DbCastExpression CastTo(
	this DbExpression argument,
	TypeUsage toType


Type: System.Data.Common.CommandTrees.DbExpression

The argument to which the cast should be applied.

Type: System.Data.Metadata.Edm.TypeUsage

Type metadata that specifies the type to cast to.

Return Value

Type: System.Data.Common.CommandTrees.DbCastExpression
A new DbCastExpression with the specified argument and target type.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type DbExpression. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


Argument or toType is null.


The specified cast is not valid.

.NET Framework

Supported in: 4.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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