为了开发规范，有时需要统一响应属性名称，.netcore已为我们封装好了，我们直接用即可。
在StartUp类中ConfigureServices方法中，添加如下代码：
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc()
.AddJsonOptions(opt =>{// opt.SerializerSettings.ContractResolver = new Newtonsoft.Json.Serialization.DefaultContractResolver();//原样输出，后台属性怎么写的，返回的 json 就是怎样的 // opt.SerializerSettings.ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver();//驼峰命名法，首字母小写opt.SerializerSettings.ContractResolver =new LowercaseContractResolver();//自定义扩展，属性全为小写 })
.SetCompatibilityVersion(CompatibilityVersion.Version_2_1);自定义全部小写扩展类：
using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;namespace MyApi.Common.Extension
{public class LowercaseContractResolver: Newtonsoft.Json.Serialization.DefaultContractResolver
{protected override string ResolvePropertyName(string propertyName)
{return propertyName.ToLower();
}
}
}
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