MethodBase.GetParameters Method

Definition

Namespace:

System.Reflection

Assembly:

System.Runtime.dll

Source:

MethodBase.cs

When overridden in a derived class, gets the parameters of the specified method or constructor.

public:
 abstract cli::array <System::Reflection::ParameterInfo ^> ^ GetParameters();

public abstract System.Reflection.ParameterInfo[] GetParameters ();

abstract member GetParameters : unit -> System.Reflection.ParameterInfo[]

Public MustOverride Function GetParameters () As ParameterInfo()

Returns

ParameterInfo[]

An array of type ParameterInfo containing information that matches the signature of the method (or constructor) reflected by this MethodBase instance.

Examples

The following example uses the GetParameters method to retrieve the parameters of the Invoke method of a delegate.

The example defines a delegate named MyDelegate and an event named ev of type MyDelegate. The code in the Main method discovers the event signature by getting the delegate type of the event, getting the Invoke method of the delegate type, and then retrieving and displaying the parameters.

// The following example uses instances of classes in
// the System::Reflection namespace to discover an event argument type.
using namespace System;
using namespace System::Reflection;

public delegate void MyDelegate( int i );
public ref class MainClass
{
public:
   event MyDelegate^ ev;
};

int main()
{
   Type^ delegateType = MainClass::typeid->GetEvent( "ev" )->EventHandlerType;
   MethodInfo^ invoke = delegateType->GetMethod( "Invoke" );
   array<ParameterInfo^>^pars = invoke->GetParameters();
   System::Collections::IEnumerator^ myEnum = pars->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      ParameterInfo^ p = safe_cast<ParameterInfo^>(myEnum->Current);
      Console::WriteLine( p->ParameterType );
   }
}
// The example displays the following output:
//       System.Int32

// The following example uses instances of classes in
// the System.Reflection namespace to discover an event argument type.
using System;
using System.Reflection;

public delegate void MyDelegate(int i);
public class MainClass
{
    public event MyDelegate ev;

    public static void Main()
    {
        Type delegateType = typeof(MainClass).GetEvent("ev").EventHandlerType;
        MethodInfo invoke = delegateType.GetMethod("Invoke");
        ParameterInfo[] pars = invoke.GetParameters();
        foreach (ParameterInfo p in pars)
        {
            Console.WriteLine(p.ParameterType);
        }
    }
}
// The example displays the following output:
//       System.Int32

Imports System.Reflection

Public Delegate Sub MyDelegate(ByVal i As Integer)

Public Class MainClass
    Public Event ev As MyDelegate

    Public Shared Sub Main()
        Dim delegateType As Type = GetType(MainClass).GetEvent("ev").EventHandlerType
        Dim invoke As MethodInfo = delegateType.GetMethod("Invoke")
        Dim pars As ParameterInfo() = invoke.GetParameters()
        For Each p As ParameterInfo In pars
            Console.WriteLine(p.ParameterType)
        Next 
    End Sub 
End Class 
' The example displays the following output:
'     System.Int32

See also

• ParameterInfo