nbsp 輸入 mic 是你 inf null reg ive dot

private static bool GetDotNetRelease(int release) { const string subkey = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\"; using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey)) { if (ndpKey != null && ndpKey.GetValue("Release") != null) { return (int)ndpKey.GetValue("Release") >= release ? true : false; } return false; } } //release是你需要檢測的版本號，比如.NET4.0，輸入4

C# winform 檢測當前電腦安裝的.net framework版本