Question

这是我的观点的相关代码：

        @Html.LabelFor(model => model.nickName)
        @Html.TextBoxFor(model => model.nickName, new { @class = "RegisterControls" })
        <br /><br />

        @Html.LabelFor(model => model.email)
        @Html.TextBoxFor(model => model.email, new { @class = "RegisterControls" })
        <br /><br />            

        @Html.LabelFor(model => model.password)
        @Html.TextBoxFor(model => model.password, new { @class = "RegisterControls" })

动作方法：

public ActionResult RegisterNewUser(string uName, string email, string password)
    {
        ViewBag.Message = "Register";

        if (!users.RegisterUser(uName, email, password))
        {
            ViewBag.DeniedMsg = "A user with that email already exists";
            return; //This doesn't work, as I should return a View
        }            
        return PartialView("_Register");            
    }

如果用户在注册时键入已存在的电子邮件（并且单击显示＆＃34;创建帐户＆＃34;的链接，我只想添加一个标签，表明该电子邮件已存在，并且不返回整个视图。请参阅我的行动方法（希望）清晰。

创建帐户链接：

@Ajax.ActionLink("Create account", "CheckifUserEmailExists", "RegisteredUsers", new AjaxOptions { UpdateTargetId = "updaterDiv" }, new { @class = "actionButtons" })

实际上，更普遍。如果有人在文本框中输入内容，您将在适当的Controller中调用action方法。但是这个Action方法总是返回一个视图。但是，如果您只是想向该用户显示消息（例如，说＆＃34;创建帐户＆＃34;）并保持相同的视图，该怎么办？你怎么处理这个？我不能这样做，因为我必须返回一个视图，但我想保持相同的视图，并在那里显示消息

Answer 1

再创建一个动作来返回字符串。像：

public string UserExistsMsg(string msg)
{
    return msg;
}

并改变你的RegisterNewUser行动：

public ActionResult RegisterNewUser(string uName, string email, string password)
    {
        ViewBag.Message = "Register";

        if (!users.RegisterUser(uName, email, password))
        {
            return RedirectToAction("UserExistsMsg", "A user with that email already exists");
        }
        return PartialView("_Register");            
    }

Answer 2

更改您的RegisterNewUser操作：

public ActionResult RegisterNewUser(string uName, string email, string password)
    {
        ViewBag.Message = "Register";
        String msg = "";
        if (!users.RegisterUser(uName, email, password))
        {
            msg = "A user with that email already exists";
        }
        ViewBag.DeniedMsg = msg;
        return PartialView("_Register");            
    }

并在局部视图顶部打印ViewBag字符串消息。像：

@VeiwBag.DeniedMsg

如果用户不存在，则不会打印任何内容。

显示标签而不是返回视图

2 个答案: