.net – 是否有TextWriter子类在写入文本时触发事件？

我还添加了posibillity以在每次写入后自动调用Flush(),因为在我的情况下,第三方组件,写入控制台,没有执行刷新.

样品用法：

void DoIt()
{
    var writer = new StringWriterExt(true); // true = AutoFlush
    writer.Flushed += new StringWriterExt.FlushedEventHandler(writer_Flushed);

    TextWriter stdout = Console.Out;
    try
    {
        Console.SetOut(writer);
        CallLongRunningMethodThatDumpsInfoOnConsole();
    }
    finally
    {
        Console.SetOut(stdout);
    }
}

现在我可以及时显示一些状态信息,而不需要等待方法完成.

void writer_Flushed(object sender,EventArgs args)
{
    UpdateUi(sender.ToString());
}

这是班级：

public class StringWriterExt : StringWriter
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    public delegate void FlushedEventHandler(object sender,EventArgs args);
    public event FlushedEventHandler Flushed;
    public virtual bool AutoFlush { get; set; }

    public StringWriterExt()
        : base() { }

    public StringWriterExt(bool autoFlush)
        : base() { this.AutoFlush = autoFlush; }

    protected void OnFlush()
    {
        var eh = Flushed;
        if (eh != null)
            eh(this,EventArgs.Empty);
    }

    public override void Flush()
    {
        base.Flush();
        OnFlush();
    }

    public override void Write(char value)
    {
        base.Write(value);
        if (AutoFlush) Flush();
    }

    public override void Write(string value)
    {
        base.Write(value);
        if (AutoFlush) Flush();
    }

    public override void Write(char[] buffer,int index,int count)
    {
        base.Write(buffer,index,count);
        if (AutoFlush) Flush();
    }
}