服务AddJsonOptions .net core 2.1

Question

以前，在.net 2.0中，您可以通过这种方式添加json内容

 services.AddJsonOptions(options => {
                    options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
                    options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
            });

或

services.AddMvc().AddJsonOptions(options => {
                    options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
                    options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
            });

我意识到我无法使用.net 2.1做同样的事情。

我收到此错误：

'IServiceCollection' does not contain a definition for 'AddJsonOptions'
and the best extension method overload 'MvcJsonMvcBuilderExtensions.AddJsonOptions(IMvcBuilder, Action<MvcJsonOptions>)' 
requires a receiver of type 'IMvcBuilder

有人解决吗？

Answer 1

使用

services.AddMvc().AddJsonOptions(...)

进行配置。

上述扩展方法可以在Microsoft.AspNetCore.Mvc.Formatters.Json Version 2.1.0.0中找到。要么直接包含此软件包，要么添加这两个Microsoft.AspNetCore.App / Microsoft.AspNetCore.All之一。

Answer 2

发现问题-您需要确保已参考

  

Microsoft.AspNetCore.Mvc