验证在下拉MVC3 [英] validation for dropdown in MVC3

问题描述

我验证使用默认的MVC验证技术形式如下：

I am validating a form using default MVC validation technique as follows:

<div class="editor-label">
        @Html.LabelFor(model => model.Company_Name)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Company_Name)
        @Html.ValidationMessageFor(model => model.Company_Name, "Company Name is required")
    </div>

这是为文本框工作的罚款。当我申请相同的下拉这是行不通的。

This is working fine for textboxes. When i applied the same for dropdown this is not working.

 <div class="editor-label">
        @Html.LabelFor(model => model.State_Code, "State")
    </div>
    <div class="editor-field">
        @Html.DropDownList("State_Code", "--Select--")
        @Html.ValidationMessageFor(model => model.State_Code,"State is required")
    </div>

如何验证在mvc3.Default下拉会 - 选择 -

How to validate for a dropdown in mvc3.Default will be "--Select--"

推荐答案

我想你可能需要@ Html.DropDownListFor（），以用于模型验证工作的结合，这意味着选择列表必须由取得该模型。

I think you might need to use @Html.DropDownListFor() in order for the model binding for validation to work, which means the SelectList will have to made by the model.

通常，这是我如何设置它：

Typically this is how I set it up:

//Libary of commom stuff
public class WebLibrary
{
    public SelectList StatesAndProvinces()
    {
        return new SelectList(
            new List<SelectListItem> { 
                new SelectListItem{ Value = "AR", Text = "Alabama" },
                new SelectListItem{ Value = "AK", Text = "Alaska" }
        }, "Value", "Text");
    }
}

//ViewModel
public class FormModel
{
    public SelectList stateDropdown { get; set; }
    public string State_Code { get; set; }
    public string Company_Name { get; set; }

    public FormModel()
    {
        stateDropdown = WebLibrary.StatesAndProvinces();
    }
}

//View
<div class="editor-field">
    @Html.DropDownListFor(model => model.State_Code, Model.stateDropdown, new { @class="dropdown" })
    @Html.ValidationMessageFor(model => model.State_Code,"State is required")
</div>   

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