覆盖ModelBindingMessageProvider错误消息 [英] Overriding ModelBindingMessageProvider error messages

问题描述

我有一个.net core 2.2 webapi。有一个 POST 动作可以接受一个模型。该模型具有 Guid 作为属性之一。当我发布此模型但提供字符串而不是Guid时，我得到了 ModelState.IsValid = false ，这是正确的。默认的模型绑定错误消息是将值\ string\转换为类型'System.Guid'时出错。路径'memberId'，第3行，位置22。 这不是我要返回的友好消息，而且该消息需要本地化为用户的语言。我已阅读的所有资源都说我需要在 AddMvC（）选项中为 ModelBindingMessageProvider 设置访问器。即

I have a .net core 2.2 webapi. There is a POST action that accepts a model. The model has a Guid as one of the properties. When I post this model but supply a string and not a Guid, I get a ModelState.IsValid = false, which is correct. The default model binding error message is "Error converting value \"string\" to type 'System.Guid'. Path 'memberId', line 3, position 22." This is not a friendly message that I want to return, also, this message needs to get localized to user's language. All the resources that I have read said I need to set the accessor for ModelBindingMessageProvider in the AddMvC() options. i.e.

services.AddMvc（options => options.ModelBindingMessageProvider.SetAttemptedValueIsInvalidAccessor（（x，y）=> blah blac）;

我在此处设置了所有访问器，但它仍然不会更改默认消息。任何人都知道如何设置这些默认值？

I have set ALL of the accessors on there and it still doesn't change the default message. Anyone knows how to set those default values?

推荐答案

问题是 InputFormatter 抛出异常，并且异常消息用于modelstate条目。您可以在 services.AddMvc（）。AddJsonOptions（options => options.AllowInputFormatterExceptionMessages = false;）中禁用此消息。错误消息的空字符串，您可以检测到该字符串，然后仅向用户显示一条通用消息。我没有找到更好的方法，但是此方法现在就足够了。

The issue is that the InputFormatter is throwing exception and the exception message is used for the modelstate entry. You can disable this in services.AddMvc().AddJsonOptions(options => options.AllowInputFormatterExceptionMessages = false;). This will add an empty string for the error message, which you can detect and then just display a generic message to user. I have not found a better way of doing this but this method will suffice for now.

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