图片流

先做一个输出图片的网页

public partial class ShowImg : System.Web.UI.Page
    {
        private string file = string.Empty;
        protected void Page_Load(object sender, EventArgs e)
        {
            //获取文件的地址参数
            file = Request.QueryString["file"].ToString();
            //以数据流的形式根据文件地址打开文件
            FileStream stream = new FileStream(file, FileMode.Open);
            //Get Size of the file
            long FileSize = stream.Length;
            //定义一个二进制数据
            byte[] Buffer=new byte[(int)FileSize];
            stream.Read(Buffer, 0, (int)FileSize);
            stream.Close();
            Response.BinaryWrite(Buffer);
            stream = null;
        }
    }

使用方法如下：

前台：<img id="img1" runat="Server" />

后台：img1.Src = "ShowImg.aspx?file=" + Server.UrlEncode(@"F:\图标素材\3960\chat.png");