c# - Span<T> 和不在 .NET Native UWP 应用程序中工作的 friend

Question

重现步骤:

1. 打开带有最新更新的 Visual Studio 2017。
2. 在 10240 中创建一个 UWP 项目目标(这不是强制性的，它在所有构建中都被破坏)
3. 从 nuget 包安装 System.Memory(单击包含预发布)

4. 将这段代码复制粘贴到 MainPage.cs 中

   private void MainPage_Loaded(object sender, RoutedEventArgs e)
   {
      void Recursive(ReadOnlySpan<char> param)
      {
          if (param.Length == 0) return;
   
          tx1.Text += Environment.NewLine;
   
          tx1.Text += new string(param.ToArray());
          Recursive(param.Slice(1));
      }
   
      ReadOnlySpan<char> mySpan = "Why things are always broken in Visual Studio".AsSpan();
   
      Recursive(mySpan);
   }
   

5. 复制粘贴到 MainPage.xaml

   <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
      <TextBlock x:Name="tx1" HorizontalAlignment="Left"   FontSize="48" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top"/>
   </Grid>
   

6. 从调试切换到发布 x64 并确保“使用 .Net Native 工具链编译”。

7. 点击播放。

8. 收到此错误:

------ Build started: Project: App12, Configuration: Release x64 ------
App12 c:\Users\myuser\documents\visual studio 2017\Projects\App12\App12\bin\x64\Release\App12.exe
Processing application code
C:\Users\myuser.nuget\packages\microsoft.net.native.compiler\1.7.3\tools\Microsoft.NetNative.targets(697,5): error : Internal compiler error: Object reference not set to an instance of an object.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
========== Deploy: 0 succeeded, 0 failed, 0 skipped ==========

我做错了什么？这适用于没有 .NET Native 的调试和发布。谢谢。

Answer 1

System.Memory is in prerelease status and doesn't work yet with .NET Native. The next version of .NET Native compiler will have support for this.

https://github.com/dotnet/corert/issues/5725