C# 如何首先显示警报框，然后重定向到任何带有查询字符串的页面？

通过使用上面的代码，我可以显示警报框，然后重定向到test.aspx页面

但当我必须传递带有如下地址的查询字符串时，就会出现问题：

ScriptManager.RegisterStartupScript(UpdatePanel2, this.GetType(), "click", "alert('This Email address is already registered...');window.location.href ='test.aspx'", true);

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提前感谢

您的代码有不必要的（'）s，这会破坏javascript中的字符串。试试这个

ScriptManager.RegisterStartupScript(UpdatePanel2, this.GetType(), "click", "alert('This Email address is already registered...');window.location.href ='test.aspx?WidgetID='" + Request.QueryString["WidgetID"] + "'&lan='" + readCookie() + "'&seeHome=true'", true);

ScriptManager.RegisterStartupScript(UpdatePanel2, this.GetType(), "click", "alert('This Email address is already registered...');window.location.href ='test.aspx?WidgetID=" + Request.QueryString["WidgetID"] + "&lan=" + readCookie() + "&seeHome=true'", true);