MVC3 删除了“required”但不断获取 data-val-required 属性

My Model

    [DataType(DataType.Text)]
    [Display(Name = "Number of Employee")]
    public int NumberOfEmployee { get; set; }

    [DataType(DataType.Date)]
    [Display(Name = "CEO Birthday")]
    [DateRange(2)]
    public DateTime CEO_Birthday { get; set; }

    [DataType(DataType.Date)]
    [Display(Name = "Organisation Anniversary")]
    [DateRange(3)]
    public DateTime OrgAnniversary { get; set; }

My View

          <tr>
            <td style="border:0;">
                <div class="editor-label">
                    @Html.LabelFor(m => m.NumberOfEmployee)                            
                </div> 
            </td>
            <td style="border:0;">
                <div class="editor-field">
                    @Html.TextBoxFor(m => m.NumberOfEmployee)
                </div>
            </td>
        </tr>

        <tr>
            <td style="border:0;vertical-align:middle;">
                <div class="editor-label">
                    @Html.LabelFor(m => m.CEO_Birthday)                            
                </div> 
            </td>
            <td style="border:0;">
                <div class="editor-field">
                    @Html.TextBoxFor(m => m.CEO_Birthday, new { @class="date"})
                </div>
            </td>
        </tr>

        <tr>
            <td style="border:0;vertical-align:middle;">
                <div class="editor-label">
                    @Html.LabelFor(m => m.OrgAnniversary)                            
                </div> 
            </td>
            <td style="border:0;">
                <div class="editor-field">
                    @Html.TextBoxFor(m => m.OrgAnniversary, new { @class = "date" })
                </div>
            </td>
          </tr>

My 全局.asax.cs

protected void Application_Start()
    {
        DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;
       .....
    }

我的模型中没有必需的属性，但我仍然得到这个

I refer This https://stackoverflow.com/questions/4700172/unrequired-property-keeps-getting-data-val-required-attribute删除必填字段，但它不适用于我的代码。帮我删除必填字段。

我通过设置可为空模型的属性得到了答案，即。

    [DataType(DataType.Text)]
    [Display(Name = "Number of Employee")]
    public int? NumberOfEmployee { get; set; }

    [DataType(DataType.Date)]
    [Display(Name = "CEO Birthday")]
    [DateRange(2)]
    public DateTime? CEO_Birthday { get; set; }

    [DataType(DataType.Date)]
    [Display(Name = "Organisation Anniversary")]
    [DateRange(3)]
    public DateTime? OrgAnniversary { get; set; }

不需要添加这个

DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;