ABP 错误 No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access. The response had HTTP status code 500.

完整错误：

 No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access. The response had HTTP status code 500.

运行后台

 

当前的错误原因：

出现了同名的方法

 解决方法：

修改同名方法中一个方法名