MVC 4 忽略 DefaultModelBinder.ResourceClassKey [英] MVC 4 ignores DefaultModelBinder.ResourceClassKey

问题描述

使用 PropertyValueRequired 键将资源文件添加到 App_GlobalResources 并将 DefaultModelBinder.ResourceClassKey 更改为文件名对 MVC 4 没有影响.字符串 The {0} field is required 永远不会改变.我不想在每个必填字段上设置资源类类型和键.我错过了什么吗?

Adding a resource file to App_GlobalResources with a PropertyValueRequired key and changing DefaultModelBinder.ResourceClassKey to the file name has no effect on MVC 4. The string The {0} field is required is never changed. I don't want to set the resource class type and key on every required field. Am I missing something?

我对 Darin Dimitrov 的代码做了一些小的修改，以保持必需的自定义工作:

I've made a small modification on Darin Dimitrov's code to keep Required customizations working:

public class MyRequiredAttributeAdapter : RequiredAttributeAdapter
{
    public MyRequiredAttributeAdapter(
        ModelMetadata metadata,
        ControllerContext context,
        RequiredAttribute attribute
    )
        : base(metadata, context, attribute)
    {
        if (attribute.ErrorMessageResourceType == null)
        {
            attribute.ErrorMessageResourceType = typeof(Messages);
        }
        if (attribute.ErrorMessageResourceName == null)
        {
            attribute.ErrorMessageResourceName = "PropertyValueRequired";
        }
    }
}

推荐答案

这不是特定于 ASP.NET MVC 4.它在 ASP.NET MVC 3 中是相同的.您不能使用 DefaultModelBinder 设置所需的消息.ResourceClassKey，只有PropertyValueInvalid.

This is not specific to ASP.NET MVC 4. It was the same in ASP.NET MVC 3. You cannot set the required message using DefaultModelBinder.ResourceClassKey, only the PropertyValueInvalid.

实现您所需要的一种方法是定义自定义RequiredAttributeAdapter:

One way to achieve what you are looking for is to define a custom RequiredAttributeAdapter:

public class MyRequiredAttributeAdapter : RequiredAttributeAdapter
{
    public MyRequiredAttributeAdapter(
        ModelMetadata metadata,
        ControllerContext context,
        RequiredAttribute attribute
    ) : base(metadata, context, attribute)
    {
        attribute.ErrorMessageResourceType = typeof(Messages);
        attribute.ErrorMessageResourceName = "PropertyValueRequired";
    }
}

您将在 Application_Start 中注册:

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

现在当一个不可为空的字段没有被赋值时，错误信息将来自 Messages.PropertyValueRequired 其中 Messages.resx 必须在 中定义App_GlobalResources.

Now when a non-nullable field is not assigned a value, the error message will come from Messages.PropertyValueRequired where Messages.resx must be defined inside App_GlobalResources.

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