如何覆盖默认的必需错误消息

您可以创建一个类并从中继承它 RequiredAttribute . 像这样:

public class CustomRequired: RequiredAttribute
{
    public CustomRequired()
    {
        this.ErrorMessage = "Le champ est requis.";
    }
}

或:

public class CustomRequired: RequiredAttribute
{
    public override string FormatErrorMessage(string whatever)
    {
        return !String.IsNullOrEmpty(ErrorMessage)
            ? ErrorMessage
            : $"Le champ {whatever} est requis.";
    }
}

你应该使用 CustomRequired 你的财产,而不是 [Required]

请执行以下操作以覆盖默认的必需错误消息:

• 创建一个继承RequiredAttributeAdapter的自定义适配器,如下所示:

public class YourRequiredAttributeAdapter : DataAnnotationsModelValidator<RequiredAttribute>
{
    public YourRequiredAttributeAdapter(ModelMetadata metadata, ControllerContext context, RequiredAttribute attribute)
        : base(metadata, context, attribute)
    {
        if (string.IsNullOrWhiteSpace(attribute.ErrorMessage)
            )
        {
            attribute.ErrorMessageResourceType ="Your resource file";
            attribute.ErrorMessageResourceName = "Keep the key name in resource file as "PropertyValueRequired";
        }
    }

}

• 在Global.asax Application\u Start()中注册适配器,如下所示:

DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(RequiredAttribute), typeof(YourRequiredAttributeAdapter));

• 资源文件配置: