Csharp ASP.NET MVC数据批注验证组复选框

我是新的ASP.NETMVC和工作的形式验证.我被一组复选框验证卡住了.基本上，我试图让用户在一组复选框中 Select 至少一个爱好.

下面的模型.您可以看到，我试图实现AtLeastOneCheckedAttribute，但无法使其正常工作.

public class EmployeeModel2
{
    [Required(AllowEmptyStrings = false, ErrorMessage = "Please Provide First Name")]
    [StringLength(20, MinimumLength = 5, ErrorMessage = "First Name Should be min 5 and max 20 length")]
    public string FirstName { get; set; }

    [Required(AllowEmptyStrings = false, ErrorMessage = "Please Provide Last Name")]
    [StringLength(20, MinimumLength = 5, ErrorMessage = "First Name Should be min 5 and max 20 length")]
    public string LastName { get; set; }

    [Required(AllowEmptyStrings = false, ErrorMessage = "Please Provide Eamil")]
    [RegularExpression("^[a-zA-Z0-9_\\.-]+@([a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$", ErrorMessage = "Please Provide Valid Email")]
    public string Email { get; set; }

    [Required(AllowEmptyStrings = false, ErrorMessage = "Please Provide Age")]
    [Range(25, 45, ErrorMessage = "Age Should be min 25 and max 45")]
    public int? Age { get; set; }

    [Required(ErrorMessage = "Please Provide Gender")]
    public string Gender { get; set; }

    //[DisplayFormat(DataFormatString = "{0:dd.MM.yyyy}")]
    [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
    [Required(ErrorMessage = "Please enter Date of Birth")]
    public DateTime DOB { get; set; }

    [DataType(DataType.Password)]
    [Required(ErrorMessage = "Please enter password")]
    public string Password { get; set; }

    [Required(ErrorMessage = "Please enter ConfirmPassword")]
    [DataType(DataType.Password)]
    [Compare("Password", ErrorMessage = "Password not matching")]
    public string ConfirmPassword { get; set; }
    
    public List<HobbyMV> Hobbies { get; set; }

    [AtLeastOneChecked(ErrorMessage = "Please select at least one checkbox")]
    public int[] selectedHobbies { get; set; }
}

// I tried this code, but it is not working properly
public class AtLeastOneCheckedAttribute : ValidationAttribute
{
    public override bool IsValid(object value)
    {
        var instance = value as IEnumerable<HobbyMV>;

        if (instance != null)
        {
            return true;
        }

        return false;
    }
}

视图中的表格.问题是，即使我选中了几个复选框，selectedHobbies个组复选框仍会提示"请至少 Select 一个复选框".

@using (Html.BeginForm("Validation2", "XForm", FormMethod.Post, htmlAttributes: new
{@class = "form"}))
{
    @Html.AntiForgeryToken()

    <div class="form-group">
        @Html.LabelFor(model => model.FirstName)
        @Html.TextBoxFor(model => model.FirstName, new { @class = "form-control", title = "Enter your first name" })
        @Html.ValidationMessageFor(m => m.FirstName, "", new {@class = "text-danger"})
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.LastName)
        @Html.TextBoxFor(model => model.LastName, new { @class = "form-control", title = "Enter your last name" })
        @Html.ValidationMessageFor(m => m.LastName, "", new {@class = "text-danger"})
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.Email)
        @Html.TextBoxFor(model => model.Email, new { @class = "form-control", title = "Enter your email address" })
        @Html.ValidationMessageFor(m => m.Email, "", new {@class = "text-danger"})
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.Age)
        @Html.TextBoxFor(model => model.Age, new { @class = "form-control", title = "Enter your age" })
        @Html.ValidationMessageFor(m => m.Age, "", new {@class = "text-danger"})
    </div>
 
    <div class="editor-field">
        @Html.EditorFor(model => model.DOB)
        @Html.ValidationMessageFor(model => model.DOB, "", new {@class = "text-danger"})
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Password)
    </div>

    <div class="editor-field">
        @Html.EditorFor(model => model.Password)
        @Html.ValidationMessageFor(model => model.Password, "", new {@class = "text-danger"})
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.ConfirmPassword, "", new {@class = "text-danger"})
    </div>

    <div class="editor-field">
        @Html.EditorFor(model => model.ConfirmPassword)
        @Html.ValidationMessageFor(model => model.ConfirmPassword, "", new {@class = "text-danger"})
    </div>

    <div class="form-group" >
        <label><b>Gender</b></label>
        <div> 
            @Html.RadioButtonFor(m => m.Gender, "Male") 
            <label>Male</label>
            @Html.RadioButtonFor(m => m.Gender, "Female") 
            <label> Female </label>
            @Html.ValidationMessageFor(m => m.Gender, "", new {@class = "text-danger"}) 
        </div>
    </div>

    <div class="form-group" >
        <label><b>Hobby</b></label><br/>
        @foreach (var item in Model.Hobbies)
        {
            <span style="padding:10px;">
                <label><input type="checkbox" value="@item.HobbyId" checked="@item.IsSelected" name="selectedHobbies" id="@item.HobbyId" /> @Html.Raw(@item.Description)</label>
            </span>
        }
        @Html.ValidationMessageFor(m => m.selectedHobbies, "", new {@class = "text-danger"})
    </div>

    <div class="form-group"> 
         <input type = "submit" value="Submit" class="btn-success" /> 
     </div>
}

如果我为这个爱好 Select 了一些复选框，然后点击提交，它没有通过验证(下面的截图)，并且消息"请至少 Select 一个复选框"不会消失.

请帮帮忙.先谢谢你.