ASP.net MVC2验证我的下拉列表框？ [英] ASP.net MVC2 validation for my Dropdown list boxes?

问题描述

谁能给我一个很好的链接来实现ASP.NET MVC2验证我的DropDownList在我看来？

Can anyone give me a nice link to Implement ASP.NET MVC2 validation for my dropdownlist in my view?

我在我看来DROPDOWNLIST是这样的：

My Dropdownlist in my view is something like this:

<%: Html.DropDownListFor(model => model.SelectedStudent, 
                         new SelectList(Model.StudentIDs, "ID", "Name"),
                         "Please select..", 
                         new { id="Student", style = "width:190px;" })%>

和我的验证信息是：

  <%:Html.ValidationMessageFor(model => model.SelectedStudent) %> 

在我的模型我有这个验证：

in my Model I have this validation:

[DisplayName("Student")]
[Required(ErrorMessage="Please Select StudentID.")]
public int Student{ get; set; }

但不知何故，它不验证我不是在我看来看到验证信息。

But somehow it's not validating and I am not seeing validation message in my view.

东西引起问题，请选择？或请纠正我，如果我错了..

Something causing problem with "Please select"? or please correct me if I am wrong..

感谢

推荐答案

在你看来，你会希望把这样的事情：

In your view, you'll want to put something like this:

<%= Html.ValidationMessageFor(model => model.DropDownListReference) %>

在你的模型，像这样

public class Whatever
{
    [Required(ErrorMessage = "Please select a Whatever!")]
    [DisplayFormat(ConvertEmptyStringToNull = false)]
    public int DropDownListReference { get; set; }
}

这是假设你只是想验证他们所选择的东西。

This is assuming that you just want to validate that they've selected something.

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