拦截的WebAPI JSON格式错误 [英] Intercept webapi json formatting errors

问题描述

我希望有一种方式来拦截，当你发送畸形的JSON到的WebAPI端点出现的异常，所以，相对于仅仅500（如修复我可以返回一个语义错误code你破碎的JSON或下地狱）

I'd like to have a way to intercept the exception that occurs when you send in malformed json to a webapi endpoint, so that I can return a semantic error code as opposed to just 500. (e.g. "Fix your broken JSON or go to hell")

推荐答案

您可以通过<一个派生创建自定义的验证筛选器属性href="http://msdn.microsoft.com/en-us/library/system.web.http.filters.actionfilterattribute(v=vs.118).aspx"相对=nofollow> ActionFilterAttribute ：

You can create your custom validation filter attribute by deriving from ActionFilterAttribute:

public class ValidationFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (!actionContext.ModelState.IsValid)
        {
            actionContext.Response = actionContext
                                     .Request
                                     .CreateErrorResponse(HttpStatusCode.BadRequest,
                                                          actionContext.ModelState);
        }
    }
}

现在，您既可以装饰你的行动吧：

Now, you may either decorate your actions with it:

[HttpGet]
[ValidationFilter()]
public string DoSomethingCool()

或通过在全球范围注册它的配置：

config.Filters.Add(new ValidationFilterAttribute());

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