F# for Xamarin MacOS X：此工具集不支持 TargetFrameworkVersionv4.5.2 (ToolsVersion4.0)

Question

我一直在 VS2015 上使用 F#，但我在 MacOS X 10.11.3 上购买了我的第一台（新）iMAC 运行并安装了 Xamarin 6.0（alpha 版本）。当我想编译一个在VS2015下没问题的文件时遇到了一些问题

我在编译时收到警告

TargetFrameworkVersionv4.5.2 not supported by this toolset (ToolsVersion4.0)

这是文件 Microsoft.Common.Targets

..../Library/Frameworks/Mono.Frameworks/Version/4.4.0/Lib/Mono/4.5/Microsoft.Common.Targets

并且在运行时出现错误

at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, System.String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost) [0x00000] in /private/tmp/source-mono-4.4.0/bockbuild-mono-4.4.0-branch/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/corlib/System.IO/FileStream.cs:152 
  at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int,System.IO.FileOptions,string,bool,bool,bool)
  at System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize, Boolean checkHost) [0x00065] in /private/tmp/source-mono-4.4.0/bockbuild-mono-4.4.0-branch/profiles/mono-mac-xamarin/build-root/mono-x86/external/referencesource/mscorlib/system/io/streamreader.cs:240 
  at System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize) [0x00000] in /private/tmp/source-mono-4.4.0/bockbuild-mono-4.4.0-branch/profiles/mono-mac-xamarin/build-root/mono-x86/external/referencesource/mscorlib/system/io/streamreader.cs:221 
  at System.IO.StreamReader..ctor (System.String path, Boolean detectEncodingFromByteOrderMarks) [0x00000] in /private/tmp/source-mono-4.4.0/bockbuild-mono-4.4.0-branch/profiles/mono-mac-xamarin/build-root/mono-x86/external/referencesource/mscorlib/system/io/streamreader.cs:202 
  at System.IO.StreamReader..ctor (System.String path) [0x00000] in /private/tmp/source-mono-4.4.0/bockbuild-mono-4.4.0-branch/profiles/mono-mac-xamarin/build-root/mono-x86/external/referencesource/mscorlib/system/io/streamreader.cs:182 
  at (wrapper remoting-invoke-with-check) System.IO.StreamReader:.ctor (string)
  at System.IO.File.OpenText (System.String path) [0x00000] in /private/tmp/source-mono-4.4.0/bockbuild-mono-4.4.0-branch/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/corlib/System.IO/File.cs:346 
  at System.IO.File.ReadAllLines (System.String path) [0x00000] in /private/tmp/source-mono-4.4.0/bockbuild-mono-4.4.0-branch/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/corlib/System.IO/File.cs:515 
  at <StartupCode$Algo_Stanford>.$Knapsack_big.main@ () [0x0000d] in /Users/francois-guillaume.rideau/Documents/Learning-Fsharp/Algo Stanford/Algo Stanford/Knapsack_big.fs:20

我该怎么办？

谢谢

Answer 1

请将目标框架更改为 .NET 4.5，因为 Mono 4.x 尚不支持 4.5.2。

F# for Xamarin MacOS X：此工具集不支持 TargetFrameworkVersionv4.5.2 (ToolsVersion4.0)

F# for Xamarin MacOS X : TargetFrameworkVersionv4.5.2 not supported by this toolset (ToolsVersion4.0)

.net

f#

target-framework

xamarin