c# - System.Diagnostics.Debug 类是否有 TextWriter 接口(interface)？

Question

我经常对 System.Diagnostics.Debug.Write/WriteLine 方法感到沮丧。我想使用 TextWriter 类熟悉的 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。我写完了

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 的类来“包装”System.Debug，还是我应该自己推出？

Answer 1

函数Debug.Print允许您使用格式和参数。

如果您更喜欢使用 TextWriter 接口(interface)，请使用以下包装器类:

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();
    };
}