Question

有人可以解释为什么我的代码中的属性IsRequestBeingRedirected始终为false，以及如何正确重定向以获得真值？

protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
    base.OnActionExecuting(filterContext);
    if (filterContext.RequestContext.HttpContext.Response.IsRequestBeingRedirected)
    {
        //some another logic
    }
    //some code       
    filterContext.RequestContext.HttpContext.Response.Redirect(filterContext.RequestContext.HttpContext.Request.Url.AbsolutePath);
}

Answer 1

在调用IsRequestBeingRedirected期间，Response.Redirect属性设置为true 。这是通过.NET Reflector的源代码：

public void Redirect(string url) { this.Redirect(url, true, false); } public void Redirect(string url, bool endResponse) { this.Redirect(url, endResponse, false); } internal void Redirect(string url, bool endResponse, bool permanent) { if (url == null) { throw new ArgumentNullException("url"); } if (url.IndexOf('\n') >= 0) { throw new ArgumentException(System.Web.SR.GetString("Cannot_redirect_to_newline")); } if (this._headersWritten) { throw new HttpException(System.Web.SR.GetString("Cannot_redirect_after_headers_sent")); } Page page = this._context.Handler as Page; if ((page != null) && page.IsCallback) { throw new ApplicationException(System.Web.SR.GetString("Redirect_not_allowed_in_callback")); } url = this.ApplyRedirectQueryStringIfRequired(url); url = this.ApplyAppPathModifier(url); url = this.ConvertToFullyQualifiedRedirectUrlIfRequired(url); url = this.UrlEncodeRedirect(url); this.Clear(); if (((page != null) && page.IsPostBack) && (page.SmartNavigation && (this.Request["__smartNavPostBack"] == "true"))) { this.Write("<BODY><ASP_SMARTNAV_RDIR url=\""); this.Write(HttpUtility.HtmlEncode(url)); this.Write("\"></ASP_SMARTNAV_RDIR>"); this.Write("</BODY>"); } else { this.StatusCode = permanent ? 0x12d : 0x12e; this.RedirectLocation = url; if (UriUtil.IsSafeScheme(url)) { url = HttpUtility.HtmlAttributeEncode(url); } else { url = HttpUtility.HtmlAttributeEncode(HttpUtility.UrlEncode(url)); } this.Write("<html><head><title>Object moved</title></head><body>\r\n"); this.Write("<h2>Object moved to <a href=\"" + url + "\">here</a>.</h2>\r\n"); this.Write("</body></html>\r\n"); } // IsRequestBeingRedirected is set here this._isRequestBeingRedirected = true; EventHandler redirecting = Redirecting; if (redirecting != null) { redirecting(this, EventArgs.Empty); } if (endResponse) { this.End(); } }

因此，在致电Response.Redirect后，您必须检查该值是否为真。

protected override void OnActionExecuting(ActionExecutingContext filterContext) { base.OnActionExecuting(filterContext); //some code filterContext.RequestContext.HttpContext.Response.Redirect(filterContext.RequestContext.HttpContext.Request.Url.AbsolutePath); if (filterContext.RequestContext.HttpContext.Response.IsRequestBeingRedirected) { //some another logic } }

当然，你的逻辑不是很清楚。您已经知道您正在重定向，因为您正在调用Response.Redirect，因此在这种情况下检查此属性似乎是多余的。

Response.IsRequestBeingRedirected始终为false

1 个答案: