Proprietà Item

Sintassi

'Dichiarazione
Public ReadOnly Default Property Item ( _
    index As Object _
) As DtsEventHandler
    Get
'Utilizzo
Dim instance As DtsEventHandlers
Dim index As Object
Dim value As DtsEventHandler

value = instance(index)

public DtsEventHandler this[
    Object index
] { get; }

public:
property DtsEventHandler^ default[Object^ index] {
    DtsEventHandler^ get (Object^ index);
}

member Item : DtsEventHandler

JScript supporta l'utilizzo di proprietà indicizzate, ma non la dichiarazione di nuove proprietà.

Osservazioni

If the call to the Contains method returns true, you can access the specified element in the collection by using the syntax DtsEventHandlers[index]. If the Contains method returns false, this property throws an exception. In C#, this property is the indexer for the DtsEventHandlers class.

Esempi

The following code example retrieves the DtsEventHandlers collection, then uses Contains to see if the item syntax [x] can be used on the collection.

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;

namespace Microsoft.SqlServer.SSIS.Samples
{
    class Program
    {
        static void Main(string[] args)
        {
            Package pkg = new Package();

            // Set up a DtsEventHandler for the OnError event of the package.
            DtsEventHandler dtsEHOE = (DtsEventHandler)pkg.EventHandlers.Add("OnError");
            DtsEventHandler dtsEHW = (DtsEventHandler)pkg.EventHandlers.Add("OnWarning");

            // Create the DtsEventHandlers collection.
            DtsEventHandlers dtsEHColls = pkg.EventHandlers;

            // Use the Contains method to see if the item[x] syntax can be used.
            Boolean dtsContains = dtsEHColls.Contains(0);
            Console.WriteLine("Item syntax can be used?  {0}", dtsContains);

            //Using the Item method syntax of [x], obtain the first entry and a name.
            DtsEventHandler dtsEHFirstEntry = dtsEHColls[0];
            String nameOfFirstItem = dtsEHColls[0].Name;

            //Print the name of the log provider object located at position [0].
            Console.WriteLine("The ID of the first event handler is: {0}", dtsEHFirstEntry.ID);
            Console.WriteLine("The Name of the first event handler is: {0}", nameOfFirstItem);
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
 
Namespace Microsoft.SqlServer.SSIS.Samples
    Class Program
        Shared  Sub Main(ByVal args() As String)
            Dim pkg As Package =  New Package() 
 
            ' Set up a DtsEventHandler for the OnError event of the package.
            Dim dtsEHOE As DtsEventHandler = CType(pkg.EventHandlers.Add("OnError"), DtsEventHandler)
            Dim dtsEHW As DtsEventHandler = CType(pkg.EventHandlers.Add("OnWarning"), DtsEventHandler)
 
            ' Create the DtsEventHandlers collection.
            Dim dtsEHColls As DtsEventHandlers =  pkg.EventHandlers 
 
            ' Use the Contains method to see if the item[x] syntax can be used.
            Dim dtsContains As Boolean =  dtsEHColls.Contains(0) 
            Console.WriteLine("Item syntax can be used?  {0}", dtsContains)
 
            'Using the Item method syntax of [x], obtain the first entry and a name.
            Dim dtsEHFirstEnTry As DtsEventHandler =  dtsEHColls(0) 
            Dim nameOfFirstItem As String =  dtsEHColls(0).Name 
 
            'Print the name of the log provider object located at position [0].
            Console.WriteLine("The ID of the first event handler is: {0}", dtsEHFirstEnTry.ID)
            Console.WriteLine("The Name of the first event handler is: {0}", nameOfFirstItem)
        End Sub
    End Class
End Namespace

Sample Output:

Item syntax can be used? True

The ID of the first event handler is: {4B9E438E-BA17-4A51-8235-3072AFF92F99}

The Name of the first event handler is: OnError

Vedere anche

Riferimento