原文:C#序列化json属性名首字母变成小写的解决方案
//接口返回自动转小写，容易造成前后端不一致，获取不到数据，切换成转驼峰（首字母大写）如Code/Result
//在ConfigureServices中配置ContractResolver
services.AddMvc().AddJsonOptions(options => { options.SerializerSettings.ContractResolver = new DefaultContractResolver(); });
