检测 .net framework 4.5.X 是否安装在 OS 中？

Question

我需要检测当前 OS 上是否安装了 .net framework 4.5.X？

我尝试了 this 但似乎仅限于使用非官方更新的框架 4.0。

Answer 1

刚刚为您进行了谷歌搜索，发现以下 MSDN 文章直接引用了您的问题。包括 4.5 版及更高版本的示例...

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

Answer 2

您可以查看注册表或直接查看已安装的程序。在“开始”菜单中键入 "appwiz.cpl"，然后搜索 .net 您将看到所有安装在您机器上的 .net。

Answer 3

// Checking the version using >= will enable forward compatibility, 
// however you should always compile your code on newer versions of
// the framework to ensure your app works the same.
private static string CheckFor45DotVersion(int releaseKey)
{
   if (releaseKey >= 393295) {
      return "4.6 or later";
   }
   if ((releaseKey >= 379893)) {
        return "4.5.2 or later";
    }
    if ((releaseKey >= 378675)) {
        return "4.5.1 or later";
    }
    if ((releaseKey >= 378389)) {
        return "4.5 or later";
    }
    // This line should never execute. A non-null release key should mean
    // that 4.5 or later is installed.
    return "No 4.5 or later version detected";
}

private static void Get45or451FromRegistry()
{
    using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\")) {
    if (ndpKey != null && ndpKey.GetValue("Release") != null) {
        Console.WriteLine("Version: " + CheckFor45DotVersion((int) ndpKey.GetValue("Release")));
    }
  else {
     Console.WriteLine("Version 4.5 or later is not detected.");
  } 
}

}

检测 .net framework 4.5.X 是否安装在 OS 中？

Detect if .net framework 4.5.X is installed in OS?

c#

windows

.net-framework-version