错误解决 System.InvalidOperationException:“Dynamic port binding is not supported when binding to localhost. You must either bind to 127.0.0.1:0 or [::1]:0, or both.”

System.InvalidOperationException:“Dynamic port binding is not supported when binding to localhost. You must either bind to 127.0.0.1:0 or [::1]:0, or both.”

 

在launchSettings  有个端口为0 的，改下就好