TraceListener.GetSupportedAttributes Yöntem

Tanım

Ad Alanı:

System.Diagnostics

Bütünleştirilmiş Kod:

System.Diagnostics.TraceSource.dll

Kaynak:

TraceListener.cs

İzleme dinleyicisi tarafından desteklenen özel öznitelikleri alır.

protected:
 virtual cli::array <System::String ^> ^ GetSupportedAttributes();

protected virtual string[]? GetSupportedAttributes ();

abstract member GetSupportedAttributes : unit -> string[]
override this.GetSupportedAttributes : unit -> string[]

Protected Overridable Function GetSupportedAttributes () As String()

Döndürülenler

String[]

İzleme dinleyicisi tarafından desteklenen özel öznitelikleri adlandıran veya null özel öznitelikler yoksa bir dize dizisi.

Örnekler

Aşağıdaki kod örneği, özel izleme dinleyicisi için yöntemini geçersiz kılma işlemini GetSupportedAttributes gösterir.

// This code example uses the following application configuration file:

//<?xml version="1.0" encoding="utf-8"?>
//      <source name="TraceTest" switchName="SourceSwitch" switchType="System.Diagnostics.SourceSwitch" >
//          <add name="Testlistener" />
//      <add name="SourceSwitch" value="Warning" />
//      <add name="Testlistener" type="CustomTraceListener.TestListener, CustomTraceListener, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" initializeData="TestListener" Source="test"/>
//    <trace autoflush="true" indentsize="4" />

using System;
using System.Diagnostics;
using System.Configuration;
using System.Reflection;
using System.Collections;
namespace CustomTraceListener
{
    class Program
    {
        static void Main(string[] args)
        {
            TraceSource ts = new TraceSource("TraceTest");
            Console.WriteLine(ts.Switch.DisplayName);
            foreach (TraceListener traceListener in ts.Listeners)
            {
                Console.Write("TraceListener: " + traceListener.Name + "\t");
                // The following output can be used to update the configuration file.
                Console.WriteLine("AssemblyQualifiedName = " +
                    (traceListener.GetType().AssemblyQualifiedName));
            }
            ts.TraceEvent(TraceEventType.Error, 1, "test error message");
        }
    }
    public class TestListener : TraceListener
    {
        string source;
        string name;
        public TestListener(string listenerName)
        {
            name = listenerName;
        }

        public string Source
        {
            get
            {
                foreach (DictionaryEntry de in this.Attributes)
                    if (de.Key.ToString().ToLower() == "source")
                        source = de.Value.ToString();
                return source;
            }
            set { source = value; }
        }

        public override void Write(string s)
        {
            Console.Write(name + " " + Source + ": " + s);
        }
        public override void WriteLine(string s)
        {
            Console.WriteLine(s);
        }
        protected override string[] GetSupportedAttributes()
        {
            return new string[] { "Source" };
        }
    }
}
// This code example creates the following output:
/*
SourceSwitch
TraceListener: Default  AssemblyQualifiedName = System.Diagnostics.DefaultTraceL
istener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e0
89
TraceListener: Testlistener     AssemblyQualifiedName = CustomTraceListener.Test
Listener, CustomTraceListener, Version=1.0.0.0, Culture=neutral, PublicKeyToken=
null
TestListener test: TraceTest Error: 1 : test error message
*/

' This code example uses the following application configuration file:
'<?xml version="1.0" encoding="utf-8"?>
'      <source name="TraceTest" switchName="SourceSwitch" switchType="System.Diagnostics.SourceSwitch" >
'          <add name="Testlistener" />
'      <add name="SourceSwitch" value="Warning" />
'      <add name="Testlistener" type="CustomTraceListener.TestListener, CustomTraceListener, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" initializeData="TestListener" Source="test"/>
'    <trace autoflush="true" indentsize="4" />
Imports System.Diagnostics
Imports System.Configuration
Imports System.Reflection
Imports System.Collections

Namespace CustomTraceListener

    Class Program

        Shared Sub Main(ByVal args() As String)
            Dim ts As New TraceSource("TraceTest")
            Console.WriteLine(ts.Switch.DisplayName)
            Dim traceListener As TraceListener
            For Each traceListener In ts.Listeners
                Console.Write("TraceListener: " + traceListener.Name + vbTab)
                ' The following output can be used to update the configuration file.
                Console.WriteLine("AssemblyQualifiedName = " + traceListener.GetType().AssemblyQualifiedName)
            Next traceListener
            ts.TraceEvent(TraceEventType.Error, 1, "test error message")

        End Sub
    End Class

    Public Class TestListener
        Inherits TraceListener
        Private [m_source] As String
        Private m_name As String

        Public Sub New(ByVal listenerName As String)
            m_name = listenerName
        End Sub


        Public Property [Source]() As String
            Get
                Dim de As DictionaryEntry
                For Each de In Me.Attributes
                    If de.Key.ToString().ToLower() = "source" Then
                        [Source] = de.Value.ToString()
                    End If
                Next de
                Return [m_source]
            End Get
            Set(ByVal value As String)
                [m_source] = value
            End Set
        End Property

        Public Overrides Sub Write(ByVal s As String)
            Console.Write(m_name + " " + [Source] + ": " + s)

        End Sub

        Public Overrides Sub WriteLine(ByVal s As String)
            Console.WriteLine(s)

        End Sub

        Protected Overrides Function GetSupportedAttributes() As String()
            Return New String() {"Source"}

        End Function 'GetSupportedAttributes
    End Class
End Namespace 'CustomTraceListener
' This code example creates the following output:
'
'SourceSwitch
'TraceListener: Default  AssemblyQualifiedName = System.Diagnostics.DefaultTraceL
'istener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e0
'89
'TraceListener: Testlistener     AssemblyQualifiedName = CustomTraceListener.Test
'Listener, CustomTraceListener, Version=1.0.0.0, Culture=neutral, PublicKeyToken=
'null
'TestListener test: TraceTest Error: 1 : test error message
'

Açıklamalar

için GetSupportedAttributes varsayılan uygulama döndürür null.

Devralanlara Notlar

sınıfından veya türetilmiş bir sınıftan TraceListener devralırken, sınıfınız için özel öznitelikler sağlamak için yöntemini geçersiz kılabilirsiniz GetSupportedAttributes() .