读取数据库中的图片(ASP.NET)

时间:2022-12-21 14:52:46

下面这个代码演示了如何在ASP.NET中读取数据库中的图片(二进制类型),并且输出到页面上。

我们这里使用的ashx的机制。同时使用了ImageConverter这个类型做图形转换。

namespace WebApplication1
{

using System.Web;
using System.Web.Services;

using System.Data.SqlClient;
using System.Drawing;

///
/// $codebehindclassname$ 的摘要说明
///

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class EmployeePhoto : IHttpHandler
{

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/jpeg";

using (SqlConnection conn = new SqlConnection("server=(local);database=northwind;integrated security=true;"))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "SELECT Photo FROM Employees WHERE EmployeeId=1";
SqlDataReader reader = cmd.ExecuteReader();
reader.Read();
byte[] buffer = (byte[])reader[0];
ImageConverter converter = new ImageConverter();
Bitmap bitmap = (Bitmap)converter.ConvertFrom(buffer);
bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
reader.Close();
conn.Close();
context.Response.End();
}
}
}

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