总结列表: 1. There is already an open DataReader associated with this Connection which must be closed first 2. npm install 失败 3. WebApi HTTP Put 405 Method not allowed WebApi项目做前后端分离,前端项目使用是AngularJs,我因为对TypeScript很感兴趣,再加上,写完WebApi接口,可以自己试着跑起来前端项目,自己调试一下…