带有错误消息的RedirecttoAction [英] RedirecttoAction with error message

问题描述

我在AdminUsers视图中的网格上有一个链接

I have a link on a grid in my AdminUsers view

grid.Column(header: "", format: (item) => (condition ? Html.ActionLink("Impersonate", "Impersonate", "Admin", new { id = item.username }, null) : Html.Label("Impersonate"), style: "webgrid-column-link"),

在控制器中，我有

public ActionResult Impersonate(string id)
{
    string result = ORCA.utilities.users.setImpersonation(id);
    if(result == "nocommonfields")
        return RedirectToAction("AdminUsers", "Admin");
    else
        return RedirectToAction("terms_of_use", "Forms");
}

当我返回AdminUsers页面时，如何发送一条错误消息以显示?

How can send an error message to display when I return to the AdminUsers page?

推荐答案

您可以使用 TempData

if(result == "nocommonfields")
{
    TempData["ErrorMessage"]="This is the message";
    return RedirectToAction("AdminUsers", "Admin");
}

，并且在AdminUsers操作中，您可以阅读

and in your AdminUsers action, you can read it

public ActionResult AdminUsers()
{
  var errMsg=TempData["ErrorMessage"] as string;
 //check errMsg value do whatever you want now as needed
}

请记住，TempData的寿命很短.会话是临时数据背后的备份存储.

Remember, TempData has very short-life span. Session is the backup storage behind temp data.

或者，您也可以考虑在查询字符串中发送一个标志，并在下一个操作方法中读取它，然后决定显示什么错误消息.

Alternatively, You may also consider sending a flag in your querystring and read it in your next action method and decide what error message to show.

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