demo学习
1、简单计算器制作：
https://blog.csdn.net/baidu_36669549/article/details/75127067
2、基础
https://www.cnblogs.com/wuqianling/p/5950667.html
3、POST/GET发送
https://www.cnblogs.com/stgp/p/6279112.html
4、C#中DataTable 转换为 Json的方法汇总(三种方法)
https://www.jb51.net/article/96343.htm
5、DataTable与数组相互转换
https://blog.csdn.net/linshichen/article/details/51942046
6、数据库连接
https://www.cnblogs.com/JiYF/p/6572453.html
https://www.cnblogs.com/zhiboday/p/6107057.html
7、json与对象转换
https://www.cnblogs.com/Jeremy2001/p/6639659.html
8、C#中各种数据遍历
https://www.cnblogs.com/H2921306656/p/6675327.html
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