基于单选按钮选择验证文本框

Question

我有这两个用于订阅的单选按钮。如果客户选择是单选按钮，那么我将显示输入电子邮件地址文本框。如果客户选择是，则电子邮件地址文本框为必填项。如何在模型内部添加条件验证？

型号：

public class CustomerModel  
{
  [Required]
  public bool Subscribe {get; set;}

  [RequiredIfYes]
  public string Email {ger; set;}
}

自定义验证类：

    public class RequiredIfYesAttribute : Attribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        if (value == "Yes")
        {
            return ValidationResult.Success;
        }
        else
        {
            return new ValidationResult("Email is Required.");
        }
    }
}

查看：

 <div class="form-group col-md-12 ">
                    <label class="required" for="subscribe">Email Subsciption</label>
                    <span >Yes : <input type="radio" value="Yes" name="Subscribe" id="chkYes" onclick="ShowHideDiv()" /></span>
                    <span >No : <input type="radio" value="No" name="Subscribe" id="chkNo" onclick="ShowHideDiv()" /></span>
          @Html.ValidationMessageFor(model => model.Subscribe)
                </div>
                <div id="dvtext" style="display: none">
                    <label for="email" class="required">Enter Email</label>
                    <div style="width:300px;">
                        @Html.TextBoxFor(model => model.Email)
                        @Html.ValidationMessageFor(model => model.Email)
                    </div>
                </div>

Answer 1

试试这个代码进行自定义验证：

 public class RequiredIfYesAttribute : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var radioName = validationContext.ObjectInstance.GetType().GetProperty("Subscribe");
        string radioValue = radioName.GetValue(validationContext.ObjectInstance, null)?.ToString();

        var emailName = validationContext.ObjectInstance.GetType().GetProperty("Email");
        string emailValue = emailName.GetValue(validationContext.ObjectInstance, null)?.ToString();

        if (radioValue == "Yes" && string.IsNullOrEmpty(emailValue))
        {
            return new ValidationResult("Email is Required.");
        }
        else
        {
            return ValidationResult.Success;
        }
    }
}