查看电脑安装的.net版本
其实很简单，但是中文搜索的内容比较啰嗦，七嘴八舌，不是官方。
下面是官方的检查办法：
https://msdn.microsoft.com/en-us/library/hh925568(v=vs.110).aspx#net_b
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To find .NET Framework versions by viewing the registry (.NET Framework 1-4)
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On the Start menu, choose Run.
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In the Open box, enter regedit.exe.
You must have administrative credentials to run regedit.exe.
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In the Registry Editor, open the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP
The installed versions are listed under the NDP subkey. The version number is stored in the Version entry. For the .NET Framework 4 the Version entry is under the Client or Full subkey (under NDP), or under both subkeys.
To find .NET Framework versions by viewing the registry (.NET Framework 4.5 and later)
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On the Start menu, choose Run.
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In the Open box, enter regedit.exe.
You must have administrative credentials to run regedit.exe.
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In the Registry Editor, open the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full
NoteIf the Full subkey is not present, then you do not have a the .NET Framework 4.5 or later installed.
Check for a DWORD value named Release. The existence of the Release DWORD indicates that the .NET Framework 4.5 or newer has been installed on that computer.
The value of the Release DWORD indicates which version of the .NET Framework is installed.
Value of the Release DWORD
Version
378389
.NET Framework 4.5
378675
.NET Framework 4.5.1 installed with Windows 8.1 or Windows Server 2012 R2
378758
.NET Framework 4.5.1 installed on Windows 8, Windows 7 SP1, or Windows Vista SP2
379893
.NET Framework 4.5.2
393273
.NET Framework 4.6 RC
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