C# core 流、字节、字符串相互转换

/// <summary>
/// 将 Stream 转成 byte[]
/// </summary>
public byte[] StreamToBytes(Stream stream)
{
    byte[] bytes = new byte[stream.Length];
    stream.Read(bytes, 0, bytes.Length); 

    // 设置当前流的位置为流的开始
    stream.Seek(0, SeekOrigin.Begin);
    return bytes;
} 

/// <summary>
/// 将 byte[] 转成 Stream
/// </summary>
public Stream BytesToStream(byte[] bytes)
{
    Stream stream = new MemoryStream(bytes);
    return stream;
} 

/// <summary>
/// 将 Stream 写入文件
/// </summary>
public void StreamToFile(Stream stream,string fileName)
{
    // 把 Stream 转换成 byte[]
    byte[] bytes = new byte[stream.Length];
    stream.Read(bytes, 0, bytes.Length);
    // 设置当前流的位置为流的开始
    stream.Seek(0, SeekOrigin.Begin); 

    // 把 byte[] 写入文件
    FileStream fs = new FileStream(fileName, FileMode.Create);
    BinaryWriter bw = new BinaryWriter(fs);
    bw.Write(bytes);
    bw.Close();
    fs.Close();
} 

/// <summary>
/// 从文件读取 Stream
/// </summary>
public Stream FileToStream(string fileName)
{
    // 打开文件
    FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
    // 读取文件的 byte[]
    byte[] bytes = new byte[fileStream.Length];
    fileStream.Read(bytes, 0, bytes.Length);
    fileStream.Close();
    // 把 byte[] 转换成 Stream
    Stream stream = new MemoryStream(bytes);
    return stream;
}

C#中byte[]与string的转换代码

1、System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();

byte[] inputBytes =converter.GetBytes(inputString);

string inputString = converter.GetString(inputBytes);

2、string inputString = System.Convert.ToBase64String(inputBytes);

byte[] inputBytes = System.Convert.FromBase64String(inputString);

FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);

如何指定编码格式转换。

string sb;
MemoryStream ms = new MemoryStream();
StreamWriter sw = new StreamWriter(ms.Encoding.GetEncoding("GB2312"));
sw.Write(sb);
sw.Flush();
sw.Close();
sw.Dispose();
byte[] bytes = ms.ToArray();
ms.Close();
ms.Dispose();