如何防止ASP.NET Core在空请求主体上将模型状态标记为无效? [英] How can I prevent ASP.NET Core from marking model state as invalid on empty request bodies?

问题描述

我有一个从请求主体接收参数的动作.客户端使用二进制格式使用此API，该格式可能会将请求模型序列化为空主体.

I have an action that receives parameters from the request body. Clients are hitting this API using a binary format that can potentially serialize request models into an empty body.

如果我使用空的请求正文敲击这些操作之一，则该操作将使用请求模型的默认值(即null)进行调用，但模型状态会标记为无效.通常这是可以的，但是如果模型状态无效，我有一个中间件会响应并显示错误.

If I hit one of these actions with an empty request body, the action is invoked with a default value (i.e. null) for the request model, but the model state is marked as invalid. This would normally be okay, but I have a middleware that responds with an error if the model state is invalid.

有什么方法可以使ASP.NET Core更优雅地处理空的请求主体，并且不将模型状态标记为无效?

Is there any way I can make ASP.NET Core handle empty request bodies more gracefully and not mark the model state as invalid?

推荐答案

浏览ASP.NET Core源代码后，我发现MvcOptions具有控制此行为的属性:

After hunting through the ASP.NET Core source code, I found that MvcOptions has a property to control this behavior:

services.AddMvc()
    .AddMvcOptions(o => o.AllowEmptyInputInBodyModelBinding = true);

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