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From where does the reference of the System.String is being done in UWP application projects?

I got this question as I have a String.Replace method option Replace(String, String, StringComparison) in any Android app projects which is referring in Xamarin.Android and same way in iOS app project referring Xamarin.iOS as well.

But, in case of UWP, I am not able to get the same behaviour of String.Replace

EDIT :

Adding to the question based on the comment that UWP is using .NET Core, is there is any documentation on which .NET Core version each of the UWP/Windows SDK version is using? Because, this option of String.Replace is something new in .NET Core 2.0 and above as I can understand from Microsoft Docs of the same as quoted above in link.

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    UWP using dotnet core
    – lindexi
    Commented Mar 19, 2019 at 6:16
  • @lindexi, thanks for the comment.. is there any info available on which version of .Net Core used by each of UWP SDK version? this feature of String.Replace is something new from .Net Core 2.0.
    – RinoTom
    Commented Mar 19, 2019 at 6:32
  • From what I know, UWP is not using .NET Core. As far as I remember it is based on .NET Standard.
    – Ryukote
    Commented Mar 19, 2019 at 6:34
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    @lindexi @Ryukote, thanks for your inputs. After some trials, i could get this option for my String.Replace function if I am referring SDK version of 16299 (Fall Creators Update) for Target and Min version of SDK in the UWP app. SDK version of 16299 is referring String.Replace from the library available in package C:\Users\UserName\.nuget\packages\microsoft.netcore.universalwindowsplatform\6.0.4\ref\uap10.0.15138\System.Runtime.dll
    – RinoTom
    Commented Mar 19, 2019 at 7:04

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Based on some trials, what I can understand is UWP is using .NET core internally for some things at least from Fall Creators Update (16299) of UWP SDK.

The above mentioned way of String.Replace() function signature is something available in a project which is targeting UWP SDK version of Fall Creators Update (16299), but not any SDK version below that.

But, .NET Core reference of UWP SDK is not something I could see anywhere officially mentioned in docs by Microsoft.

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