本文实例讲述了C#中图片、二进制与字符串的相互转换方法。分享给大家供大家参考，具体如下：
protected void Button1_Click( object sender, EventArgs e)
{
//图片转二进制
byte [] imageByte = GetPictureData(Server.MapPath( "./uploadfile/111.png" ));
//二进制转换成字符串
string picStr = Convert.ToBase64String(imageByte);
//输出字符串
Response.Write(picStr);
//字符串转二进制
byte [] imageBytes = Convert.FromBase64String(picStr);
//读入MemoryStream对象
MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);
memoryStream.Write(imageBytes, 0, imageBytes.Length);
//二进制转成图片保存
System.Drawing.Image image = System.Drawing.Image.FromStream(memoryStream);
image.Save(Server.MapPath( "./uploadfile/222.png" ));
}
/// <summary>
/// 二进制流转图片
/// </summary>
/// <param name="streamByte">二进制流</param>
/// <returns>图片</returns>
public System.Drawing.Image ReturnPhoto( byte [] streamByte)
{
System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
return img;
}
/// <summary>
/// 图片转二进制
/// </summary>
/// <param name="imagepath">图片地址</param>
/// <returns>二进制</returns>
public byte [] GetPictureData( string imagepath)
{
//根据图片文件的路径使用文件流打开，并保存为byte[]
FileStream fs = new FileStream(imagepath, FileMode.Open); //可以是其他重载方法
byte [] byData = new byte [fs.Length];
fs.Read(byData, 0, byData.Length);
fs.Close();
return byData;
}
/// <summary>
/// 图片转二进制
/// </summary>
/// <param name="imgPhoto">图片对象</param>
/// <returns>二进制</returns>
public byte [] PhotoImageInsert(System.Drawing.Image imgPhoto)
{
//将Image转换成流数据，并保存为byte[]
MemoryStream mstream = new MemoryStream();
imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);
byte [] byData = new Byte[mstream.Length];
mstream.Position = 0;
mstream.Read(byData, 0, byData.Length);
mstream.Close();
return byData;
}
希望本文所述对大家C#程序设计有所帮助。
dy("nrwz");
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