如何使用C＃从SQL数据库检索图像？

Question

如何使用C＃从SQL数据库检索图像？

Answer 1

我相信这是你需要的：an msdn example with code!它至少应该让你开始。

Answer 2

为什么不尝试使用查询字符串。这里是我的代码，在查询字符串中使用，我从数据库中获取图像，而不必在您的本地文件夹中创建任何想要的图像的instatnce。跳这有助于。

<%@ WebHandler Language="C#" Class="DisplayImg" %> 

using System; 
using System.Web; 
using System.Configuration; 
using System.IO; 
using System.Data; 
using System.Data.SqlClient; 

public class DisplayImg : IHttpHandler 
{ 

    public void ProcessRequest(HttpContext context) 
    { 
     string theID; 
     if (context.Request.QueryString["id"] != null) 
      theID = context.Request.QueryString["id"].ToString(); 
     else 
      throw new ArgumentException("No parameter specified"); 

     context.Response.ContentType = "image/jpeg"; 
     Stream strm = DisplayImage(theID); 
     byte[] buffer = new byte[2048]; 
     int byteSeq = strm.Read(buffer, 0, 2048); 

     while (byteSeq > 0) 
     { 
      context.Response.OutputStream.Write(buffer, 0, byteSeq); 
      byteSeq = strm.Read(buffer, 0, 2048); 
     } 
    } 

    public Stream DisplayImage(string theID) 
    { 
     SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SERVER"].ConnectionString.ToString()); 
     string sql = "SELECT Server_image_icon FROM tbl_ServerMaster WHERE server_Code = @ID"; 
     SqlCommand cmd = new SqlCommand(sql, connection); 
     cmd.CommandType = CommandType.Text; 
     cmd.Parameters.AddWithValue("@ID", theID); 
     connection.Open(); 
     object theImg = cmd.ExecuteScalar(); 
     try 
     { 
      return new MemoryStream((byte[])theImg); 
     } 
     catch 
     { 
      return null; 
     } 
     finally 
     { 
      connection.Close(); 
     } 
    } 

    public bool IsReusable 
    { 
     get 
     { 
      return false; 
     } 
    } 
} 

只需添加一行在CS代码

UploadImg.ImageUrl = “〜/ DisplayImg.ashx ID =？” +代码;