TraceSource.GetSupportedAttributes 方法

定义

命名空间:

System.Diagnostics

程序集:

System.Diagnostics.TraceSource.dll

Source:

TraceSource.cs

获取跟踪源所支持的自定义特性。

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()

返回

String[]

对跟踪源支持的自定义特性进行命名的字符串数组；如果不存在自定义特性，则为 null。

示例

下面的代码示例演示方法的重写， GetSupportedAttributes 以标识 类的 MyTraceSource 自定义属性。

public class MyTraceSource : TraceSource
{
    string firstAttribute = "";
    string secondAttribute = "";
    public MyTraceSource(string n) : base(n) {}

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

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

    protected override string[] GetSupportedAttributes()
    {
        // Allow the use of the attributes in the configuration file.
        return new string[] { "FirstTraceSourceAttribute", "SecondTraceSourceAttribute" };
    }
}

Public Class MyTraceSource
    Inherits TraceSource
    Private firstAttribute As String = ""
    Private secondAttribute As String = ""

    Public Sub New(ByVal n As String)
        MyBase.New(n)

    End Sub

    Public Property FirstTraceSourceAttribute() As String
        Get
            Dim de As DictionaryEntry
            For Each de In Me.Attributes
                If de.Key.ToString().ToLower() = "firsttracesourceattribute" Then
                    firstAttribute = de.Value.ToString()
                End If
            Next de
            Return firstAttribute
        End Get
        Set(ByVal value As String)
            firstAttribute = value
        End Set
    End Property

    Public Property SecondTraceSourceAttribute() As String
        Get
            Dim de As DictionaryEntry
            For Each de In Me.Attributes
                If de.Key.ToString().ToLower() = "secondtracesourceattribute" Then
                    secondAttribute = de.Value.ToString()
                End If
            Next de
            Return secondAttribute
        End Get
        Set(ByVal value As String)
            secondAttribute = Value
        End Set
    End Property

    Protected Overrides Function GetSupportedAttributes() As String()
        ' Allow the use of the attributes in the configuration file.
        Return New String() {"FirstTraceSourceAttribute", "SecondTraceSourceAttribute"}

    End Function 'GetSupportedAttributes
End Class

注解

的默认实现 GetSupportedAttributes 返回 null。

继承者说明

从 TraceSource 类或派生类继承时，可以重写 GetSupportedAttributes() 方法，为类提供自定义属性。