如何判断某版本的.NET Framework是否安装
1..NET Framework
.NET Framework2.0
键：[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727]
值：Install = 1
.NET Framework3.0
键：[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.0]
值：Install = 1
.NET Framework3.5
键：[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5]
值：Install = 1
http://www.microsoft.com/ko-kr/download/details.aspx?id=22
2.Service Pack（以2.0 SP1为例）
键：[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727] 值：SP = 1
3.语言包（以简体中文为例）
键：[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727\2052] 值：Install = 1
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