How to Keep a BaseStream Open After Closing a StreamWriter?

How to keep BaseStream open after StreamWriter is closed?

The

StreamWriter class releases its underlying BaseStream when it is closed. This can be a problem if you want to keep BaseStream open for further use.

Solutions for .NET Framework 4.5 and above

If you are using .NET Framework 4.5 or higher, you can use an overloaded version of StreamWriter that allows you to specify whether the BaseStream should remain open when closing the writer:

public StreamWriter(Stream stream, Encoding encoding, bool leaveOpen);

You can close leaveOpen without closing true by setting the BaseStream parameter to StreamWriter.

Solutions for earlier versions of .NET Framework

If you are using a .NET Framework version earlier than 4.5, you have two options:

1. Do not release StreamWriter. Instead, refresh it and allow BaseStream to stay open.
2. Create a stream wrapper. creates a class that wraps BaseStream and ignores calls to Close() and Dispose(). This allows you to close StreamWriter without affecting BaseStream.

Example (Pre-.NET Framework 4.5)

public class StreamWrapper : Stream
{
    private Stream _baseStream;

    public StreamWrapper(Stream baseStream)
    {
        _baseStream = baseStream;
    }

    public override void Close()
    {
        // 忽略对 Close 的调用
    }

    public override void Dispose()
    {
        // 忽略对 Dispose 的调用
    }

    // 将其他流方法代理到基础流
    ...
}

Using this stream wrapper, you can create a StreamWriter that uses the wrapped stream:

var baseStream = new MemoryStream();
var wrappedStream = new StreamWrapper(baseStream);
using (var writer = new StreamWriter(wrappedStream, Encoding.UTF8))
{
    writer.Write("...");
    writer.Flush();
}

// 基础流保持打开状态
baseStream.Seek(0, SeekOrigin.Begin);

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