PropertyInfo.GetIndexParameters Method
Definition
Important
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When overridden in a derived class, returns an array of all the index parameters for the property.
public:
abstract cli::array <System::Reflection::ParameterInfo ^> ^ GetIndexParameters();
public abstract System.Reflection.ParameterInfo[] GetIndexParameters ();
abstract member GetIndexParameters : unit -> System.Reflection.ParameterInfo[]
Public MustOverride Function GetIndexParameters () As ParameterInfo()
Returns
An array of type ParameterInfo
containing the parameters for the indexes. If the property is not indexed, the array has 0 (zero) elements.
Implements
Examples
The following example displays the index parameters of the specified property.
using namespace System;
using namespace System::Reflection;
// A class that contains some properties.
public ref class MyProperty
{
private:
// Define a simple string property.
String^ caption;
public:
property String^ Caption
{
String^ get()
{
return caption;
}
void set( String^ value )
{
if ( caption != value )
{
caption = value;
}
}
}
private:
// A very limited indexer that gets or sets one of four
// strings.
array<String^>^strings;
public:
MyProperty()
{
array<String^>^temp0 = {"abc","def","ghi","jkl"};
strings = temp0;
}
property String^ Item [int]
{
String^ get( int Index )
{
return strings[ Index ];
}
void set( int Index, String^ value )
{
strings[ Index ] = value;
}
}
};
int main()
{
// Get the type and PropertyInfo.
Type^ t = Type::GetType( "MyProperty" );
PropertyInfo^ pi = t->GetProperty( "Caption" );
// Get the public GetIndexParameters method.
array<ParameterInfo^>^parms = pi->GetIndexParameters();
Console::WriteLine( "\n{0}.{1} has {2} parameters.", t->FullName, pi->Name, parms->GetLength( 0 ) );
// Display a property that has parameters.
pi = t->GetProperty( "Item" );
parms = pi->GetIndexParameters();
Console::WriteLine( "{0}.{1} has {2} parameters.", t->FullName, pi->Name, parms->GetLength( 0 ) );
for ( int i = 0; i < parms->GetLength( 0 ); i++ )
{
Console::WriteLine( " Parameter: {0}", parms[ i ]->Name );
}
return 0;
}
/*
This example produces the following output:
MyProperty.Caption has 0 parameters.
MyProperty.Item has 1 parameters.
Parameter: Index
*/
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]
{
get
{
return strings[Index];
}
set
{
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
*/
Imports System.Reflection
Imports System.Collections
' A test class that has some properties.
Public Class MyProperty
' Define a simple string property.
Private myCaption As String = "A Default caption"
Public Property Caption() As String
Get
Return myCaption
End Get
Set(ByVal Value As String)
If myCaption <> value Then
myCaption = value
End If
End Set
End Property
' A very limited indexed default property that gets or
' sets one of four string values.
Private strings() As String = {"abc", "def", "ghi", "jkl"}
Public Default Property Item(ByVal Index As Integer) As String
Get
Return strings(Index)
End Get
Set
strings(Index) = Value
End Set
End Property
End Class
Public Class Example
Public Shared Function Main() As Integer
' Get the type and PropertyInfo.
Dim t As Type = GetType(MyProperty)
Dim pi As PropertyInfo = t.GetProperty("Caption")
' Get an array containing the parameters (if any).
Dim params As ParameterInfo() = pi.GetIndexParameters()
Console.WriteLine(vbCrLf & t.FullName & "." & pi.Name & _
" has " & params.GetLength(0) & " parameters.")
' Display a property that has parameters.
pi = t.GetProperty("Item")
params = pi.GetIndexParameters()
Console.WriteLine(t.FullName & "." & pi.Name & _
" has " & params.GetLength(0) & " parameters.")
For Each p As ParameterInfo In params
Console.WriteLine(" Parameter: " & p.Name)
Next
Return 0
End Function
End Class
' This example produces the following output:
' MyProperty.Caption has 0 parameters.
' MyProperty.Item has 1 parameters.
' Parameter: Index
Remarks
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.
Applies to
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