c# – 如何从asp.net处理程序返回404错误？

概述我创建了一个下载文件的处理程序. 如果文件不存在或用户无权下载该特定文件,我想返回404错误. 可能吗？如果是,怎么样？示例代码将不胜感激. 检查此代码 public class MyHandler : IHttpHandler{ private const string CONSTSOMEPARAM = "SomeParam"; public MyHandler() { } 我创建了一个下载文件的处理程序.
如果文件不存在或用户无权下载该特定文件,我想返回404错误.

可能吗？如果是,怎么样？示例代码将不胜感激.

解决方法 检查此代码

public class MyHandler : IhttpHandler{    private const string CONSTSOMEParaM = "SomeParam";    public MyHandler() { }    public voID ProcessRequest(httpContext context)    {        // Don't allow this response to be cached by the browser.        // Note,you MIGHT want to allow it to be cached,depending on what you're doing.        context.Response.Cache.SetCacheability(httpCacheability.NoCache);        context.Response.Cache.SetNoStore();        context.Response.Cache.SetExpires(DateTime.MinValue);        if (ValIDateParameters(context) == false)        {            //Internal Server Error            context.Response.StatusCode = 500;            context.Response.End();            return;        }        if (context.User.IDentity.IsAuthenticated == false)        {            //ForbIDden            context.Response.StatusCode = 403;            context.Response.End();            return;        }        string someParam = context.Request.queryString[CONSTSOMEParaM];        SomethingReponse response = SomeService.someimportantThing(someParam);        if (response.header == null || response.header.Success == false)        {            //Whatever wasn't found            context.Response.StatusCode = 404;            context.Response.End();            return;        }        context.Response.ContentType = "somespecific/mimetype";        context.Response.BinaryWrite();        //or        context.Response.Write();        //or        context.Response.Writefile();        //or        someimagestream.Save(context.Response.OutputStream);    }    public bool ValIDateParameters(httpContext context)    {        //ValIDate some stuff...true if cool,false if not        return false;    }    /// <summary>    /// True if this handler can be reused between calls. That's cool if you don't have any class instance data.    /// False if you'd rather get a fresh one.    /// </summary>    public bool IsReusable    {        get        {            return true;        }    }}

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