MVC .Net Core 模型验证 - 值“"无效.错误 [英] MVC .Net Core Model Validation - The value '' is invalid. Error

问题描述

我正在尝试在 MVC .Net Core 中使用模型验证，但无法替换此默认错误消息值"无效".

I am trying to use Model Validation in MVC .Net Core and can't manage to replace this default error message 'The value '' is invalid'.

理论上，我们可以通过在Model中使用ErrorMessage Annotation来替换我们自己自定义的错误信息.但我找不到一种方法来实现这一点.

In theory, we can replace our own custom error message by using ErrorMessage Annotation in the Model. But I couldn't find a way to make this one work.

我的模型

[Required(ErrorMessage = "Date Required")]
[DataType(DataType.Date, ErrorMessage = "Invalid Date Format")]                
[Display(Name = "Appointment Date")]
[DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
public DateTime AppointmentDate { get; set; }

如上所示，我为 Required 和 DataType 标签放置了不同的 ErrorMessage.

I put different ErrorMessage for both Required and DataType tag as shown in the above.

我的 html 视图

    <div class="col-md-2">
        <input class="form-control" asp-for="AppointmentDate">
        <span asp-validation-for="AppointmentDate" class="text-danger"></span>
    </div>

能否请您帮我如何替换该错误消息?谢谢.

Could you please help me how I could get that error message replaced? Thanks.

推荐答案

为了使您的 Required 属性起作用，您需要使字段可为空:

In order to make your Required attribute works you need to make field nullable:

public DateTime? AppointmentDate { get; set; }

Edit:还请注意，DataType 属性实际上不对字段执行验证.将 post 数据绑定到 model

Edit: also note that DataType attribute actually doesn't perform validation on field. MVC validate date when applying binding from post data to model

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