是否有System.Diagnostics.Debug类的TextWriter接口？

Question

我经常对System.Diagnostics.Debug.Write / WriteLine方法感到沮丧。 我想使用TextWriter类中熟悉的Write / WriteLine方法，所以我经常写

Debug.WriteLine("# entries {0} for connection {1}", countOfEntries, connection);

这会导致编译器错误。 我最终写作了

Debug.WriteLine(string.Format("# entries {0} for connection {1}", 
    countOfEntries, connection));

这真的很尴尬。

CLR是否有一个派生自TextWriter的类“包装”System.Debug，还是应该自己滚动？

Answer 1

Debug.Print函数允许您使用格式和参数。

如果您更喜欢使用TextWriter接口，请使用以下包装类：

public class DebugTextWriter : StreamWriter
{
    public DebugTextWriter()
        : base(new DebugOutStream(), Encoding.Unicode, 1024)
    {
        this.AutoFlush = true;
    }

    sealed class DebugOutStream : Stream
    {
        public override void Write(byte[] buffer, int offset, int count)
        {
            Debug.Write(Encoding.Unicode.GetString(buffer, offset, count));
        }

        public override bool CanRead => false;
        public override bool CanSeek => false;
        public override bool CanWrite => true;
        public override void Flush() => Debug.Flush();

        public override long Length => throw bad_op;
        public override int Read(byte[] buffer, int offset, int count) => throw bad_op;
        public override long Seek(long offset, SeekOrigin origin) => throw bad_op;
        public override void SetLength(long value) => throw bad_op;
        public override long Position
        {
            get => throw bad_op;
            set => throw bad_op;
        }

        static InvalidOperationException bad_op => new InvalidOperationException();
    };
}

Answer 2

下面是System.Diagnostics.Debug的TextWriter包装器：

class TextWriterDebug : System.IO.TextWriter
{
    public override System.Text.Encoding Encoding
    {
        get { return System.Text.Encoding.Default; }
    }

    //public override System.IFormatProvider FormatProvider
    //{ get; }
    //public override string NewLine
    //{ get; set; }

    public override void Close()
    {
        System.Diagnostics.Debug.Close();
        base.Close();
    }

    protected override void Dispose(bool disposing)
    {
        base.Dispose(disposing);
    }

    public override void Flush()
    {
        System.Diagnostics.Debug.Flush();
        base.Flush();
    }

    public override void Write(bool value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(char value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(char[] buffer)
    {
        System.Diagnostics.Debug.Write(buffer);
    }

    public override void Write(decimal value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(double value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(float value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(int value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(long value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(object value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(string value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(uint value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(ulong value)
    {
        System.Diagnostics.Debug.Write(value);
    }

    public override void Write(string format, object arg0)
    {
        System.Diagnostics.Debug.Write(string.Format(format, arg0));
    }

    public override void Write(string format, params object[] arg)
    {
        System.Diagnostics.Debug.Write(string.Format(format, arg));
    }

    public override void Write(char[] buffer, int index, int count)
    {
        string x = new string(buffer, index, count);
        System.Diagnostics.Debug.Write(x);
    }

    public override void Write(string format, object arg0, object arg1)
    {
        System.Diagnostics.Debug.Write(string.Format(format, arg0, arg1));
    }

    public override void Write(string format, object arg0, object arg1, object arg2)
    {
        System.Diagnostics.Debug.Write(string.Format(format, arg0, arg1, arg2));
    }

    public override void WriteLine()
    {
        System.Diagnostics.Debug.WriteLine(string.Empty);
    }

    public override void WriteLine(bool value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(char value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(char[] buffer)
    {
        System.Diagnostics.Debug.WriteLine(buffer);
    }

    public override void WriteLine(decimal value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(double value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(float value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(int value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(long value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(object value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(string value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(uint value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(ulong value)
    {
        System.Diagnostics.Debug.WriteLine(value);
    }

    public override void WriteLine(string format, object arg0)
    {
        System.Diagnostics.Debug.WriteLine(string.Format(format, arg0));
    }

    public override void WriteLine(string format, params object[] arg)
    {
        System.Diagnostics.Debug.WriteLine(string.Format(format, arg));
    }

    public override void WriteLine(char[] buffer, int index, int count)
    {
        string x = new string(buffer, index, count);
        System.Diagnostics.Debug.WriteLine(x);

    }

    public override void WriteLine(string format, object arg0, object arg1)
    {
        System.Diagnostics.Debug.WriteLine(string.Format(format, arg0, arg1));
    }

    public override void WriteLine(string format, object arg0, object arg1, object arg2)
    {
        System.Diagnostics.Debug.WriteLine(string.Format(format, arg0, arg1, arg2));
    }

} // Ends class TextWriterDebug 

Answer 3

你特别需要一个完整的TextWriter吗？ 虽然这有点“快速和肮脏”，但我怀疑只有几种方法的静态类可以很好地完成：

public static class DebugEx
{
    [Conditional("DEBUG")]
    public static void WriteLine(string format, params object[] args)
    {
        Debug.WriteLine(string.Format(format, args));
    }
}

或类似的东西。

请注意，我个人会看一下像log4net这样的东西，以便更好地控制输出。

Answer 4

对于C＃6及更高版本， 字符串插值是大多数字符串格式的答案。 所以这个例子看起来像：

Debug.WriteLine($"# entries {countOfEntries} for connection {connection}");