如何保持DropDownList的选定值后回传 [英] How to keep dropdownlist selected value after postback

问题描述

在asp.net MVC3如何保持项下拉列表回发后选定的。

In asp.net mvc3 how to keep dropdown list selected item after postback.

推荐答案

更​​容易，你可以在你的ActionResult输入参数包括你的下拉列表中的姓名（或名称）。您的下拉菜单应该在表单标签。当的ActionResult发布到，ASP.Net将通过查询字符串，表单值和饼干迭代。只要你包括你的名字下拉列表中，选择的值将是preserved。

Even easier, you can include the name(s) of your dropdowns in your ActionResult input parameters. Your dropdowns should be in form tags. When the ActionResult is posted to, ASP.Net will iterate through querystrings, form values and cookies. As long as you include your dropdown names, the selected values will be preserved.

在这里，我有3下拉菜单的职位，以一个ActionResult的形式。下拉名（不区分大小写）：REPORTNAME，Year和Month

Here I have a form with 3 dropdowns that posts to an ActionResult. The dropdown names are (non-case sensitive): ReportName, Year, and Month.

    //MAKE SURE TO ACCEPT THE VALUES FOR REPORTNAME, YEAR, AND MONTH SO THAT THEY PERSIST IN THE DROPDOWNS EVEN AFTER POST!!!!
    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult ReportSelection(string reportName, string year, string month)
    {
        PopulateFilterDrowdowns();
        return View("NameOfMyView");
    }

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