【IHttpHandler】使用IHttpHandler防盗链

防盗链

```
using System;
```
```
using System.Data;
```
```
using System.Configuration;
```
```
using System.Web;
```
```
using System.Web.Security;
```
```
using System.Web.UI;
```
```
using System.Web.UI.WebControls;
```

using System.Web.UI.WebControls.WebParts;

```
using System.Web.UI.HtmlControls;
```
```
public class myhandler : IHttpHandler
```
```
{
```

    public void ProcessRequest(HttpContext context)

```
    {
```

        string FileName = context.Server.MapPath(context.Request.FilePath);

        if (context.Request.UrlReferrer.Host == null)

```
        {
```

            context.Response.ContentType = "image/JPEG";

            context.Response.WriteFile("~/images/no.png");//被替换图片

```
        }
```
```
        else
```
```
        {
```

            if (context.Request.UrlReferrer.Host.IndexOf("localhost") > -1)//这里是你的域名

```
            {
```

                context.Response.ContentType = "image/JPEG";

                context.Response.WriteFile(FileName);

```
            }
```
```
            else
```
```
            {
```

                context.Response.ContentType = "image/JPEG";

                context.Response.WriteFile("~/images/no.png");

```
            }
```
```
        }
```
```
    }
```
```
    public bool IsReusable
```
```
    {
```
```
        get { return true; }
```
```
    }
```
```
    public myhandler()
```
```
    {
```
```
    }
```
```
}
```

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