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PropertyInfo.GetIndexParameters Method

Gets 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 that contains the index parameters. 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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0