有没有简单的方法来检查.NET Framework版本？

这样的事情应该做。只需从注册表中获取价值

对于.NET 1-4 ：

framework

SP

RegistryKey installed_versions = Registry.LocalMachine.OpenSubKey(@"SOFTWAREMicrosoftNET framework SetupNDP");string[] version_names = installed_versions.GetSubKeyNames();//version names start with 'v', eg, 'v3.5' which needs to be trimmed off before conversiondouble framework = Convert.ToDouble(version_names[version_names.Length - 1].Remove(0, 1), CultureInfo.InvariantCulture);int SP = Convert.ToInt32(installed_versions.OpenSubKey(version_names[version_names.Length - 1]).GetValue("SP", 0));

对于.NET 4.5+ （根据官方文档）：

using System;using Microsoft.Win32;...private static void Get45or451FromRegistry(){    using (RegistryKey ndpKey = RegistryKey.OpenbaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE\Microsoft\NET framework Setup\NDP\v4\Full\")) {        int releaseKey = Convert.ToInt32(ndpKey.GetValue("Release"));        if (true) { Console.WriteLine("Version: " + CheckFor45DotVersion(releaseKey));        }    }}...// Checking the version using >= will enable forward compatibility,  // however you should always compile your pre on newer versions of // the framework to ensure your app works the same. private static string CheckFor45DotVersion(int releaseKey){    if (releaseKey >= 461808) {        return "4.7.2 or later";    }    if (releaseKey >= 461308) {        return "4.7.1 or later";    }    if (releaseKey >= 460798) {        return "4.7 or later";    }    if (releaseKey >= 394802) {        return "4.6.2 or later";    }    if (releaseKey >= 394254) {        return "4.6.1 or later";    }    if (releaseKey >= 393295) {        return "4.6 or later";    }    if (releaseKey >= 393273) {        return "4.6 RC 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";}