I found the answer:
In VS for Mac, this did not allow me to go to the menu to select the target structure for the project. This usually opens by right-clicking on the project and selecting "properties".
VS for Mac did not show this.
iMac , AspNetCore2.0 ( 1.0 1.1 ). . :
https://www.microsoft.com/net/targeting?utm_source=getdotnetsdk&utm_medium=referral
SDK AspNet Core 2.0 MacOS Windows 64-. , .
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