Image 数据,在C#里面的相互转化

image(这里是Bitmap) 转变成 MemoryStream

Bitmap b = new Bitmap(Server.MapPath(ppath));//Server.MapPath 与*.config文件在同一目录下
Stream ms = new MemoryStream();
b.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

MemoryStream 转变成 image(这里是Bitmap)

MemoryStream ms = new MemoryStream(Bytes);
Bitmap b = Bitmap.FromStream(ms,true);

MermoryStream 转成 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);

Byte[] 转成 MermoryStream

Stream stream = new MemoryStream(bytes);

3.
Byte[] 转为 String , string 转为 Byte[]

System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
byte[] inputBytes =converter.GetBytes(inputString);
string inputString = converter.GetString(inputBytes);

MermorySream 转成文件

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();
}

文件转成 MeroryStream

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;
 
 
}

Image 数据,在C#里面的相互转化

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