Artikel
11/17/2011

Expression.Call Method (Expression, String, array<Type[], array<Expression[])

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Creates a MethodCallExpression that represents a call to an instance method by calling the appropriate factory method.

Namespace: System.Linq.Expressions
Assembly: System.Core (in System.Core.dll)

Syntax

'Declaration
Public Shared Function Call ( _
    instance As Expression, _
    methodName As String, _
    typeArguments As Type(), _
    ParamArray arguments As Expression() _
) As MethodCallExpression

public static MethodCallExpression Call(
    Expression instance,
    string methodName,
    Type[] typeArguments,
    params Expression[] arguments
)

Parameters

instance
Type: System.Linq.Expressions.Expression
An Expression whose Type property value will be searched for a specific method.

methodName
Type: System.String
The name of the method.

typeArguments
Type: array<System.Type[]
An array of Type objects that specify the type parameters of the generic method. This argument should be null when methodName specifies a non-generic method.

arguments
Type: array<System.Linq.Expressions.Expression[]
An array of Expression objects that represents the arguments to the method.

Return Value

Type: System.Linq.Expressions.MethodCallExpression
A MethodCallExpression that has the NodeType property equal to Call, the Object property equal to instance, Method set to the MethodInfo that represents the specified instance method, and Arguments set to the specified arguments.

Exceptions

Exception	Condition
ArgumentNullException	instance or methodName is nulla null reference (Nothing in Visual Basic).
InvalidOperationException	No method whose name is methodName, whose type parameters match typeArguments, and whose parameter types match arguments is found in instance.Type or its base types. -or- More than one method whose name is methodName, whose type parameters match typeArguments, and whose parameter types match arguments is found in instance.Type or its base types.

ArgumentNullException

instance or methodName is nulla null reference (Nothing in Visual Basic).

InvalidOperationException

No method whose name is methodName, whose type parameters match typeArguments, and whose parameter types match arguments is found in instance.Type or its base types.

-or-

More than one method whose name is methodName, whose type parameters match typeArguments, and whose parameter types match arguments is found in instance.Type or its base types.

Remarks

The Type property of the resulting MethodCallExpression is equal to the return type of the method denoted by methodName.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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