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ParameterModifier Structure

Attaches a modifier to parameters so that binding can work with parameter signatures in which the types have been modified.

Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public struct ParameterModifier
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class ParameterModifier extends ValueType
JScript suports the use of structures, but not the declaration of new ones.

The ParameterModifier structure is used with the Type.InvokeMember method overload when passing parameters by reference to a COM component that is accessed late bound. The parameters that are to be passed by reference are specified by a single ParameterModifier structure, which must be passed in an array containing a single element. The single ParameterModifier structure in this array must be initialized with the number of parameters in the member that is to be invoked. To indicate which of these parameters are passed by reference, set the value of the Item property (the indexer in C#) to true for the index number corresponding to the zero-based position of the parameter.

The following Visual Basic and C# code shows this for a member that has three string arguments, the first and third of which are passed by reference. Assume that a variable named obj contains a reference to the COM object.

    ' Create an array containing the arguments.
    Dim args() As Object = {"Argument 1", "Argument 2", "Argument 3" }

    ' Initialize a ParameterModifier with the number of parameters.
    Dim p As New ParameterModifier(3)

    ' Pass the first and third parameters by reference.
    p(0) = True
    p(2) = True

    ' The ParameterModifier must be passed as the single element
    ' of an array.
    Dim mods() As ParameterModifier = { p }

    ' Invoke the method late bound.
    obj.GetType().InvokeMember("MethodName", BindingFlags.InvokeMethod,
         Nothing, obj, args, mods, Nothing, Nothing)

    // Create an array containing the arguments.
    object[] args = {"Argument 1", "Argument 2", "Argument 3" };

    // Initialize a ParameterModifier with the number of parameters.
    ParameterModifier p = new ParameterModifier(3);

    // Pass the first and third parameters by reference.
    p[0] = true;
    p[2] = true;

    // The ParameterModifier must be passed as the single element
    // of an array.
    ParameterModifier[] mods = { p };

    // Invoke the method late bound.
    obj.GetType().InvokeMember("MethodName", BindingFlags.InvokeMethod,
         null, obj, args, mods, null, null);

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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