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PropertyInfo.GetIndexParameters Method

When overridden in a derived class, returns an array of all the index parameters for the property.

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

public abstract ParameterInfo[] GetIndexParameters()

Return Value

Type: System.Reflection.ParameterInfo[]
An array of type ParameterInfo containing the parameters for the indexes. If the property is not indexed, the array has 0 (zero) elements.



Extract any required parameter information from the returned array.

To use the GetIndexParameters method, first get the class Type. From the Type, get the PropertyInfo. From the PropertyInfo, use the GetIndexParameters method.

The following example displays the index parameters of the specified property.

using System;
using System.Reflection;

// A class that contains some properties.
public class MyProperty   
    // Define a simple string property.
    private string caption = "A Default caption";
    public string Caption
        get{return caption;}
        set {if(caption!=value) {caption = value;}

    // A very limited indexer that gets or sets one of four 
    // strings.
    private string[] strings = {"abc", "def", "ghi", "jkl"};
    public string this[int Index]    
            return strings[Index];
            strings[Index] = value;

class Mypropertyinfo
    public static int Main()
        // Get the type and PropertyInfo.
        Type t = Type.GetType("MyProperty");
        PropertyInfo pi = t.GetProperty("Caption");

        // Get the public GetIndexParameters method.
        ParameterInfo[] parms = pi.GetIndexParameters();
        Console.WriteLine("\r\n" + t.FullName + "." + pi.Name
            + " has " + parms.GetLength(0) + " parameters.");

        // Display a property that has parameters. The default 
        // name of an indexer is "Item".
        pi = t.GetProperty("Item");
        parms = pi.GetIndexParameters();
        Console.WriteLine(t.FullName + "." + pi.Name + " has " + 
            parms.GetLength(0) + " parameters.");
        foreach( ParameterInfo p in parms )
            Console.WriteLine("   Parameter: " + p.Name);

        return 0;
 This example produces the following output:
 MyProperty.Caption has 0 parameters.
 MyProperty.Item has 1 parameters.
    Parameter: Index

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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