Question

我有多次使用此表单类'Value'，'Maximum'字段仅在某些情况下使用。如果'Show'属性为true并且显示'Maximum'字段，我需要验证'Maximum'是否有值。提前谢谢！

型号：

public class Value
{
    public bool Show { get; set; }
    public bool Required { get; set; }
    [RequiredIf("Show", Domain.Comparison.IsEqualTo, true, ErrorMessageResourceType = typeof(Resources.ErrorMessages), ErrorMessageResourceName = "AuthorLabelIsRequired")]
    public string Label { get; set; }
    public string Description { get; set; }
    [RequiredIf("Show", Domain.Comparison.IsEqualTo, true, ErrorMessageResourceType = typeof(Resources.ErrorMessages), ErrorMessageResourceName = "AuthorLabelIsRequired")]
    public int? Maximum { get; set; }
}

HTML：

<tr>
                    <td>@Html.EnumString(Model.Data.DateSection.Key)</td>
                    <td>@Html.CheckBoxFor(m => m.Data.DateSection.Value.Show)</td>
                    <td>@Html.CheckBoxFor(m => m.Data.DateSection.Value.Required)</td>
                    <td>
                        @Html.TextBoxFor(m => m.Data.DateSection.Value.Label, new { @class = "form-control" })
                        @Html.ValidationMessageFor(m => m.Data.DateSection.Value.Label)
                    </td>
                    <td>@Html.TextBoxFor(m => m.Data.DateSection.Value.Description, new { @class = "form-control" })</td>
                    <td></td>
                </tr>
                <tr>
                    <td>@Html.EnumString(Model.Data.DescriptionSection.Key)</td>
                    <td>@Html.CheckBoxFor(m => m.Data.DescriptionSection.Value.Show)</td>
                    <td>@Html.CheckBoxFor(m => m.Data.DescriptionSection.Value.Required)</td>
                    <td>
                        @Html.TextBoxFor(m => m.Data.DescriptionSection.Value.Label, new { @class = "form-control" })
                        @Html.ValidationMessageFor(m => m.Data.DescriptionSection.Value.Label)
                    </td>
                    <td>@Html.TextBoxFor(m => m.Data.DescriptionSection.Value.Description, new { @class = "form-control" })</td>
                    <td>
                        @Html.TextBoxFor(m => m.Data.DescriptionSection.Value.Maximum, new { @class = "form-control" })
                        @Html.ValidationMessageFor(m => m.Data.DescriptionSection.Value.Maximum)
                    </td>
                </tr>

Answer 1

在ASP.NET MVC中处理条件验证实际上是一种相当优雅的方式。你的模型最终会看起来像这样：

public class Value : IValidatableObject {
    public bool Show { get; set; }
    public bool Required { get; set; }
    [RequiredIf("Show", Domain.Comparison.IsEqualTo, true, ErrorMessageResourceType = typeof(Resources.ErrorMessages), ErrorMessageResourceName = "AuthorLabelIsRequired")]
    public string Label { get; set; }
    public string Description { get; set; }
    [RequiredIf("Show", Domain.Comparison.IsEqualTo, true, ErrorMessageResourceType = typeof(Resources.ErrorMessages), ErrorMessageResourceName = "AuthorLabelIsRequired")]
    public int? Maximum { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) {
        if (this.Show && !this.Maximum.HasValue) {
            yield return new ValidationResult("You must specify a maximum value");
        }
    }
}

注意模型：

实施IValidateableObject
有一个名为Validate的方法，它返回类型IEnumerable<ValidationResult>

在模型绑定过程中，将自动调用此方法，如果返回验证结果，则ModelState将不再有效。因此，在您的控制器中使用此熟悉的代码将确保您不采取任何操作，除非您的自定义条件检查：

public class SomeController {
    public ActionResult SomeAction() {
        if (ModelState.IsValid) {
            //Do your stuff!
        }
    }
}

MVC5中的多个验证要求

1 个答案: