Proprietà Item

Sintassi

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

value = instance(index)

public LogProvider this[
    Object index
] { get; }

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

member Item : LogProvider

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

Eccezioni

Osservazioni

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

Esempi

The following code example adds and removes log providers for the package, in addition to showing the use of the Contains and Item syntax of [0] for 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();
            // Make several log providers available to the package.
            LogProvider log1 = pkg.LogProviders.Add("DTS.LogProviderEventLog.2");
            LogProvider log2 = pkg.LogProviders.Add("DTS.LogProviderSQLProfiler.2");
            LogProvider log3 = pkg.LogProviders.Add("DTS.LogProviderTextFile.2");
            LogProvider log4 = pkg.LogProviders.Add("DTS.LogProviderTextFile.2");
            // Show the log providers available to the package.
            Console.WriteLine("Log providers available in the Package:");
            LogProviders logs = pkg.LogProviders;
            foreach (LogProvider lp in logs)
                Console.WriteLine(lp.CreationName);

            // Pick a log provider for the package.
            pkg.LoggingOptions.SelectedLogProviders.Add(log4);
            pkg.LoggingOptions.SelectedLogProviders.Add(log1);
            SelectedLogProviders provs = pkg.LoggingOptions.SelectedLogProviders;
            Console.WriteLine();
            Console.WriteLine("Selected Log Providers for Package: {0}", provs.Count);

            foreach (LogProvider lp in provs)
                Console.WriteLine(lp.CreationName);

            pkg.LoggingOptions.SelectedLogProviders.Remove(0);
            Console.WriteLine();
            Console.WriteLine("Count after one has been removed {0}", provs.Count);

            // Test both the indexer and Contains method.
            if (logs.Contains(0))
                Console.WriteLine("Index zero in collection contains:  {0}", logs[0].CreationName);
            else
                throw new Exception();

            // Show the use of the GetEnumerator.
            LogProviderEnumerator myEnum = pkg.LogProviders.GetEnumerator();
            Console.WriteLine("The collection contains the following values:");
            while ((myEnum.MoveNext()) && (myEnum.Current != null))
                Console.WriteLine("{0}", myEnum.Current.Name);
        }
    }
}

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() 
            ' Make several log providers available to the package.
            Dim log1 As LogProvider =  pkg.LogProviders.Add("DTS.LogProviderEventLog.2") 
            Dim log2 As LogProvider =  pkg.LogProviders.Add("DTS.LogProviderSQLProfiler.2") 
            Dim log3 As LogProvider =  pkg.LogProviders.Add("DTS.LogProviderTextFile.2") 
            Dim log4 As LogProvider =  pkg.LogProviders.Add("DTS.LogProviderTextFile.2") 
            ' Show the log providers available to the package.
            Console.WriteLine("Log providers available in the Package:")
            Dim logs As LogProviders =  pkg.LogProviders 
            Dim lp As LogProvider
            For Each lp In logs
                Console.WriteLine(lp.CreationName)
            Next
 
            ' Pick a log provider for the package.
            pkg.LoggingOptions.SelectedLogProviders.Add(log4)
            pkg.LoggingOptions.SelectedLogProviders.Add(log1)
            Dim provs As SelectedLogProviders =  pkg.LoggingOptions.SelectedLogProviders 
            Console.WriteLine()
            Console.WriteLine("Selected Log Providers for Package: {0}", provs.Count)
 
            Dim lp As LogProvider
            For Each lp In provs
                Console.WriteLine(lp.CreationName)
            Next
 
            pkg.LoggingOptions.SelectedLogProviders.Remove(0)
            Console.WriteLine()
            Console.WriteLine("Count after one has been removed {0}", provs.Count)
 
            ' Test both the indexer and Contains method.
            If logs.Contains(0) Then
                Console.WriteLine("Index zero in collection contains:  {0}", logs(0).CreationName)
            Else 
                Throw New Exception()
            End If
 
            ' Show the use of the GetEnumerator.
            Dim myEnum As LogProviderEnumerator =  pkg.LogProviders.GetEnumerator() 
            Console.WriteLine("The collection contains the following values:")
            While (myEnum.MoveNext()) &&(myEnum.Current <> Nothing)
                Console.WriteLine("{0}", myEnum.Current.Name)
            End While
        End Sub
    End Class
End Namespace

Sample Output:

Log providers available in the Package:

DTS.LogProviderTextFile.2

DTS.LogProviderSQLProfiler.2

DTS.LogProviderEventLog.2

DTS.LogProviderTextFile.2

Selected Log Providers for Package: 2

DTS.LogProviderTextFile.2

DTS.LogProviderEventLog.2

Count after one has been removed 1

Index zero in collection contains: DTS.LogProviderTextFile.2

The collection contains the following values:

{9A4FD6D3-7DE2-43AD-8B02-CE9B02E7504B}

{AB1C156F-8018-4063-A1A5-48E122CE6FFD}

{B8E93B36-36FE-4E65-9814-9752915E9E15}

{E586A867-86EC-4901-8F5A-C945D4469C46}

Vedere anche

Riferimento