Solution:
Configuration, DefaultContractResolver () is outputted in class ConfigureServices Startup () method, consistent with the background defined returned json
Code:
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc().AddJsonOptions(opt =>
{
opt.SerializerSettings.ContractResolver = new Newtonsoft.Json.Serialization.DefaultContractResolver();//json字符串原样输出
});
}