如何查看安裝的 .NET Framework 版本為何和是否有做update

可以參考MSDN的資料：

How to: Determine Which .NET Framework Versions Are Installed

http://msdn.microsoft.com/en-us/library/hh925568(v=vs.110).aspx

Users can install and run multiple versions of the .NET Framework on their computers. When you develop or deploy your app, you might need to know which .NET Framework versions are installed on the user’s computer. Note that the .NET Framework consists of two main components, which are versioned separately:

• A set of assemblies, which are collections of types and resources that provide the functionality for your apps. The .NET Framework and assemblies share the same version number.
• The common language runtime (CLR), which manages and executes your app's code. The CLR is identified by its own version number (see .NET Framework Versions and Dependencies).