Статья
11/18/2011

Expression.Call Method (MethodInfo, array<Expression[])

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Creates a MethodCallExpression that represents a call to a static (Shared in Visual Basic) method that has arguments.

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

Syntax

'Declaration
Public Shared Function Call ( _
    method As MethodInfo, _
    ParamArray arguments As Expression() _
) As MethodCallExpression

public static MethodCallExpression Call(
    MethodInfo method,
    params Expression[] arguments
)

Parameters

method
Type: System.Reflection.MethodInfo
A MethodInfo that represents a static (Shared in Visual Basic) method to set the Method property equal to.

arguments
Type: array<System.Linq.Expressions.Expression[]
An array of Expression objects to use to populate the Arguments collection.

Return Value

Type: System.Linq.Expressions.MethodCallExpression
A MethodCallExpression that has the NodeType property equal to Call and the Method and Arguments properties set to the specified values.

Exceptions

Exception	Condition
ArgumentNullException	method is nulla null reference (Nothing in Visual Basic).
ArgumentException	The number of elements in arguments does not equal the number of parameters for the method represented by method. -or- One or more of the elements of arguments is not assignable to the corresponding parameter for the method represented by method.

ArgumentNullException

method is nulla null reference (Nothing in Visual Basic).

ArgumentException

The number of elements in arguments does not equal the number of parameters for the method represented by method.

-or-

One or more of the elements of arguments is not assignable to the corresponding parameter for the method represented by method.

Remarks

If arguments is not nulla null reference (Nothing in Visual Basic), it must have the same number of elements as the number of parameters for the method represented by method. Each element in arguments must not be nulla null reference (Nothing in Visual Basic) and must be assignable to the corresponding parameter of method, possibly after quoting.

Note:
An element will be quoted only if the corresponding method parameter is of type Expression. Quoting means the element is wrapped in a Quote node. The resulting node is a UnaryExpression whose Operand property is the element of arguments.

The Arguments property of the resulting MethodCallExpression is empty if arguments is nulla null reference (Nothing in Visual Basic). Otherwise, it contains the same elements as arguments, some of which may be quoted.

The Type property of the resulting MethodCallExpression is equal to the return type of the method represented by method. The Object property is nulla null reference (Nothing in Visual Basic).

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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