Xamarin 如何将.NET Core 3.0 Preview8与App Center构建一起使用

我已经在我的应用程序中实现了.NET Core 3.0 Preview 8，但现在当我尝试使用app Center时，我收到以下错误消息：

当前的.NET SDK不支持以.NET Core 3.0为目标

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有没有办法将.NET Core 3.0 Preview 8与App Center Build一起使用？

App Center Build目前不支持.NET Core的预览版本，但我们可以使用手动安装程序手动安装.NET Core 3.0 Preview 8

以下是我就这一主题进行的演练：

wgethttps://dot.net/v1/dotnet-install.sh
chmod+x dotnet-install.sh
./dotnet-install.sh--版本“3.0.100-preview8-013656”--安装目录“$AGENT_TOOLSDIRECTORY/dotnet”

==============================================================================
Task         : Command Line
Description  : Run a command line with arguments
Version      : 1.1.3
Author       : Microsoft Corporation
Help         : [More Information](https://go.microsoft.com/fwlink/?LinkID=613735)
==============================================================================
[command]/bin/bash -c /usr/bin/find . -name '*.sln' -type f -print0 | /usr/bin/xargs -0 grep -l 'MondayPundayApp.Droid.csproj' | /usr/bin/xargs -I '{}' nuget restore '{}' -DisableParallelProcessing
MSBuild auto-detection: using msbuild version '15.0' from '/Library/Frameworks/Mono.framework/Versions/6.0.0/lib/mono/msbuild/15.0/bin'.
/Users/vsts/hostedtoolcache/dotnet/sdk/2.2.300/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(137,5): error NETSDK1045: The current .NET SDK does not support targeting .NET Core 3.0.  Either target .NET Core 2.2 or lower, or use a version of the .NET SDK that supports .NET Core 3.0. [/Users/vsts/agent/2.155.1/work/1/s/Src/MondayPundayApp.UnitTests/MondayPundayApp.UnitTests.csproj]

##[error]/bin/bash failed with return code: 1
##[error]/bin/bash failed with error: /bin/bash failed with return code: 1