安装NeGet包

<ItemGroup>
	<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
</ItemGroup>

反序列化

 List<RNetWorkResult> mRNetWorkResults = Newtonsoft.Json.JsonConvert
 	.DeserializeObject<List<RNetWorkResult>>(mItem[1]);

序列化

string mResult = Newtonsoft.Json.JsonConvert.SerializeObject(mNetWorkSpeedEntities);