1 比特数组转图片

public static Image byteToImg(byte[] buffer)
{
    MemoryStream ms = new MemoryStream(buffer);
    ms.Position = 0;
    Image img = Image.FromStream(ms);
    ms.Close();
    return img;
}

2 图片转比特数组

public static byte[] byte2img(Bitmap Bit)
{
    byte[] back = null;
    MemoryStream ms = new MemoryStream();
    Bit.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
    back = ms.GetBuffer();
    return back;
}

3 字符串转比特数组

public static byte[] str2byte(string str)
{
    byte[] data = System.Text.Encoding.UTF8.GetBytes(param);
    //byte[] data = Convert.FromBase64String(param);
    //有很多种编码方式，可参考:http://blog.csdn.net/luanpeng825485697/article/details/77622243
    return data;
}

4 比特数组转字符串

public static string str2byte(byte[] data)
{
    string str = System.Text.Encoding.UTF8.GetString(data);
    //str = Convert.ToBase64String(data);
    //有很多种编码方式，可参考:http://blog.csdn.net/luanpeng825485697/article/details/77622243
    return str;
}

5 内存流转比特数组

public static byte[] byte2stream(MemoryStream outStream)
{
    return outStream.ToArray();
}
public byte[] stream2byte(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;
}

6 比特数组转内存流

public Stream byte2stream(byte[] bytes)
{
    Stream stream = new MemoryStream(bytes);
    return stream;
}

7 流的写入文件

public void stream2file(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();
}

8 文件的读取

public Stream file2stream(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;
}