ParameterModifier Structure
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Attaches a modifier to parameters so that binding can work with parameter signatures in which the types have been modified.
Assembly: mscorlib (in mscorlib.dll)
The ParameterModifier type exposes the following members.
| Name | Description | |
|---|---|---|
 | ParameterModifier | Initializes a new instance of the ParameterModifier structure that represents the specified number of parameters. |
| Name | Description | |
|---|---|---|
| Equals | Indicates whether this instance and a specified object are equal. (Inherited from ValueType.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Returns the hash code for this instance. (Inherited from ValueType.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ToString | Returns the fully qualified type name of this instance. (Inherited from ValueType.) |
 Important Note: |
|---|
Windows Phone applications cannot access COM objects by using ParameterModifier. |
The ParameterModifier structure is used with the Type::InvokeMember(String, BindingFlags, Binder, Object, array<Object>, array<ParameterModifier>, CultureInfo, array<String>) 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 code example 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);