How to Check .net framework version installed_check net framework version-优快云博客

本文提供了两种检查计算机上是否已安装指定版本的.NET Framework的方法。方法一涉及注册表路径检查，通过验证特定文件的存在来确认运行时安装状态；方法二则通过加载库文件并调用特定API来判断。

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Method 1:

1.) Under HKLM/SOFTWARE/Microsoft/.NETFramework/policy/ check to see if the version you want is installed (for example, look for the v1.1 folder and 4322 for the version number to detect the released version of V1.1)

2.) Under HKLM/Software/Microsoft/.NETFramework/InstallRoot get the path where the Framework is installed. Create a directory string by concatenating the install root and the version under policy. E.g. "C:/WINDOWS/Microsoft.NET/Framework/ " + "v1.1 " + ". " + "4322 "

3.) Look at the directory, if mscorlib.dll (or another critical .dll to the .NET framework is there) the runtime is installed.

Method 2:

There 's a caveat to this method in that the shim gets left behind when we uninstall if there is more than one version of the CLR on the machine, but it still can be useful depending on what version you 're looking for:

LoadLibrary(“mscoree.dll“); - if this fails then there 's no runtime installed

GetProcAddress(“CorBindToRuntime“); - if this fails there 's no runtime installed

CorBindToRuntime(“GetRequestedRuntimeInfo“);

GetRequestedRuntimeInfo(xxxx); where xxxx is the build number.