C# Stream 和 byte[] 之间的转换

* Stream 和 byte[] 之间的转换
* - - - - - - - - - - - - - - - - - - - - - - - */
/// <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;
}

/* - - - - - - - - - - - - - - - - - - - - - - - -
* Stream 和 文件之间的转换
* - - - - - - - - - - - - - - - - - - - - - - - */
/// <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#中结合Post发送的Stream与Byte Array的操作似乎资料很少.下面是我这几天的研究成果.功能是将同文件夹下的a.jpg复制生成b.jpg.代码如下:

byteArray.aspx.cs

sing System; 
using System.IO; 
using System.Data;
using System.Drawing; 
using System.Drawing.Imaging;
using System.Net; 
/*@ 
Author:frank 
Site:www.2solo.cn 
Date:2008.02.20
Info:C#复制图片,流与byteArray的应用,生成图片部分
*/
namespace bArray { 
   public partial class imgHandler : System.Web.UI.Page 
     { 
        protected void Page_Load(object sender, EventArgs e) 
         { 
            try 
            { 
                Stream sin = Page.Request.InputStream; 
                System.Drawing.Image img = System.Drawing.Bitmap.FromStream(sin); 
                Bitmap bmp = new Bitmap(img); 
                MemoryStream bmpStream = new MemoryStream(); 
                bmp.Save(bmpStream, System.Drawing.Imaging.ImageFormat.Jpeg); 
                FileStream fs = new FileStream(System.Web.HttpContext.Current.Server.MapPath("b.jpg"), FileMode.Create); 
                bmpStream.WriteTo(fs); 
                bmpStream.Close(); 
                fs.Close(); 
                bmpStream.Dispose(); 
                fs.Dispose(); 
                Response.Write("成功"); 
            } 
            catch 
            { 
                Response.Write("失败"); 
            } 
        } 
    } 
} 

gopost.aspx.cs

using System; 
using System.IO; 
using System.Drawing; 
using System.Drawing.Imaging;
using System.Net; 
using System.Text; 
/*@ 
Author:frank 
Site:www.2solo.cn 
Date:2008.02.20 
info:C#复制图片,流与byteArray的应用,提交图片部分 
*/ 
namespace gopost 
{ 
    public partial class postHandler : System.Web.UI.Page 
    {  
       protected void Page_Load(object sender, EventArgs e) 
        {  
           postImage(); 
        }  
       private void postImage() 
        { 
            try 
            { 
                HttpWebRequest request; 
                string imgUrl = System.Web.HttpContext.Current.Server.MapPath("a.jpg"); 
                request = (HttpWebRequest)HttpWebRequest.Create(http://localhost/byteArray/byteArray.aspx); 
                request.KeepAlive = true; 
                request.Method = "POST"; 
                byte[] byteArray = CvtImgBArr((System.Drawing.Image)new Bitmap(@imgUrl), ImageFormat.Jpeg); 
                request.ContentType = "image/JPEG"; 
                request.ContentLength = byteArray.Length;
                Stream newStream = request.GetRequestStream();
                newStream.Write(byteArray, 0, byteArray.Length); 
                newStream.Close(); 
                Response.Write("复制图片成功"); 
            } 
            catch 
            { 
                Response.Write("复制图片失败"); 
            } 
        } 
        private static byte[] CvtImgBArr(System.Drawing.Image imageToConvert, ImageFormat formatOfImage) 
        { 
            byte[] imArr; 
            try 
            { 
                using (MemoryStream myms = new MemoryStream()) 
                { 
                    imageToConvert.Save(myms, formatOfImage); 
                    imArr = myms.ToArray(); 
                } 
            } 
            catch (Exception) { throw; } 
            return imArr; 
        } 
    } 
}