Expression.ConvertChecked Method (Expression, Type)
Creates a UnaryExpression that represents a conversion operation that throws an exception if the target type is overflowed.
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 ConvertChecked and the Operand and Type properties set to the specified values.
| Exception | Condition |
|---|---|
| ArgumentNullException | expression or type is null. |
| InvalidOperationException | No conversion operator is defined between expression.Type and type. |
The Method property of the resulting UnaryExpression is set to the implementing method. The IsLiftedToNull property is false. If the node is lifted, IsLifted is true. Otherwise, it is false.
The following rules determine the implementing method for the operation:
If either expression.Type or type is a user-defined type that defines an implicit or explicit conversion operator, the MethodInfo that represents that operator is the implementing method.
Otherwise:
If both expression.Type and type represent numeric or Boolean types, or nullable or non-nullable enumeration types, the implementing method is null.
If either expression.Type or type is a reference type and an explicit boxing, unboxing, or reference conversion exists from expression.Type to type, the implementing method is null.
If the implementing method is not null:
If expression.Type is assignable to the argument type of the implementing method and the return type of the implementing method is assignable to type, the node is not lifted.
If either or both of expression.Type or type are a nullable value type and the corresponding non-nullable value types are equal to the argument type and the return type of the implementing method respectively, the node is lifted.
If the implementing method is null:
If both expression.Type and type are non-nullable, the node is not lifted.
Otherwise the node is lifted.
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