.NET Framework ??? ????? ??

.NET Framework ??, ?? 3.5 SP 1? ???? ?? ???? ???? ?? ?????. ??? Environment.Version()? ???? ? ??? ??? ??? ?? ?? ??? ?? ??? ???? ?? ??? ?? ? ????.

?? ?? ?? ?? ??? ????.

.NET 1-4? ??

???? ???? ??? ??????? ?? ???? ???? ????. .NET ?? 1~4? ?? ?? ?? ??? ??? ? ????.

RegistryKey installed_versions = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP");
string[] version_names = installed_versions.GetSubKeyNames();
// version names 以 'v' 開頭，例如 'v3.5'，在轉換前需要去除
double 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));

? ???? "Framework" ??? ??? ?? ??? ???? "SP"? ?? ??? ? ??? ?????.

.NET 4.5? ??

?? 4.5 ??? ?? ?? Microsoft ????? ?? ??? ?????.

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));
        }
    }
}


...


// 使用 >= 檢查版本將啟用前向兼容性，
// 但是您應該始終在新版本的框架上編譯代碼，以確保您的應用程序以相同的方式工作。
private static string CheckFor45DotVersion(int releaseKey)
{
    if (releaseKey >= 528040) {
        return "4.8 或更高版本";
    }
    if (releaseKey >= 461808) {
        return "4.7.2 或更高版本";
    }
    if (releaseKey >= 461308) {
        return "4.7.1 或更高版本";
    }
    if (releaseKey >= 460798) {
        return "4.7 或更高版本";
    }
    if (releaseKey >= 394802) {
        return "4.6.2 或更高版本";
    }
    if (releaseKey >= 394254) {
        return "4.6.1 或更高版本";
    }
    if (releaseKey >= 393295) {
        return "4.6 或更高版本";
    }
    if (releaseKey >= 393273) {
        return "4.6 RC 或更高版本";
    }
    if ((releaseKey >= 379893)) {
        return "4.5.2 或更高版本";
    }
    if ((releaseKey >= 378675)) {
        return "4.5.1 或更高版本";
    }
    if ((releaseKey >= 378389)) {
        return "4.5 或更高版本";
    }
    // 此行不應該執(zhí)行。非空 release 密鑰應該意味著
    // 已安裝 4.5 或更高版本。
    return "未檢測到 4.5 或更高版本";
}

? ??? ?????? ???? ??? .NET Framework ??? ?? ??? ?? ?????.

??? ??? ???? ???? ??? .NET Framework ??? ??? ???? ??? ? ???? ??? ??? ??? ??? ???????? ???? ??? ? ????.

? ??? ??? .NET Framework ?? ? ??? ?? ????? ????? ??? ?? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!