C# asp.net mvc中未显示模型验证

我正在使用Asp.NETMVC4和.NET4.5。我有一个视图，在编辑模式下显示班级名称、班级教师名称和该班级的学生列表。我的主要观点是

public class Class
{
    public int ClassId { get; set; }

    public string ClassName { get; set; }

    public string ClassTeacherName { get; set; }

    [RequiredInList(FieldName = "LastName", ErrorMessageResourceType = typeof(ErrorMessagesResource), ErrorMessageResourceName = "Required")]
    public List<Student> Students { get; set; }
}

我的自定义属性为

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Parameter, AllowMultiple = true)]
public class RequiredInListAttribute : RequiredAttribute
{
    /// <summary>
    /// Gets or sets the name.
    /// </summary>
    public string FieldName { get; set; }

    /// <summary>
    /// The is valid.
    /// </summary>
    /// <param name="value">
    /// The value.
    /// </param>
    /// <param name="validationContext">
    /// The validation context.
    /// </param>
    /// <returns>
    /// The <see cref="ValidationResult"/>.
    /// </returns>
    /// <exception cref="InvalidOperationException">
    /// Invalid operation exception
    /// </exception>
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var val = value as IEnumerable;
        if (value == null || val == null)
        {
            throw new InvalidOperationException("This attribute Required In List is intended to use only on list");
        }

        var isInvalidFiled =
            (val.Cast<object>().Select(v => v.GetType().GetProperty(this.FieldName).GetValue(v, null))).Any(
                property => property == null);

        return !isInvalidFiled
                   ? ValidationResult.Success
                   : new ValidationResult(string.Format(this.ErrorMessageString, "Last Name"), new[]{"Students[0].LastName"});
    }
}

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现在我的问题是，在发布表单后，即使没有提供姓氏，也不会出现错误。

将此内容放在您的CSHTML页面上：

 @Html.ValidationSummary()

您也可以在cshtml中的每个字段后使用类似的内容：

  @Html.ValidationMessageFor(model => model.StudentID)

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…调试这段代码告诉你什么？调试期间isInvalidField的值是多少？isInvalidField的值将变为True。因此，应该添加理想的验证消息。但它不会出现在要添加到客户端或服务器端？服务器端的viewValidation消息中。现在不需要客户端。为什么不编辑您的问题并添加CSHTML文件？那会有帮助的。

  @Html.ValidationMessageFor(model => model.StudentID)