一、目的、構思

1.檢測當前系統有沒有安裝某個程序，如果沒有就重新安裝。

2.在網上找到了兩種方法，可惜都找不到需要檢測的app。

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二、code實現

1.查找注冊列表方式。要在winform的project使用，在console project 貌似找不到Microsoft.Win32.RegistryKey。

        public static bool CheckIfAppInstall(string appKeyName, out bool installResult){installResult = false;bool result = false;try{Microsoft.Win32.RegistryKey uninstallNode = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall");foreach (string subKeyName in uninstallNode.GetSubKeyNames()){Microsoft.Win32.RegistryKey subKey = uninstallNode.OpenSubKey(subKeyName);object displayName = subKey.GetValue("DisplayName");if (displayName != null){if (displayName.ToString().Contains(appKeyName)){installResult = true;}}}result = true;}catch (Exception e){string error = $"error in CheckIfAppInstall：{e.Message}";throw new Exception(error);}return result;}

2.使用MsiGetProductInfo。

        static void Main(){StringBuilder result = new StringBuilder();for (int index = 0; ; index++){StringBuilder productCode = new StringBuilder(39);if (MsiEnumProducts(index, productCode) != 0){break;}foreach (string property in new string[] { "ProductName", "Publisher", "VersionString", }){int charCount = 512;StringBuilder value = new StringBuilder(charCount);if (MsiGetProductInfo(productCode.ToString(), property, value, ref charCount) == 0){value.Length = charCount;result.AppendLine(value.ToString());}}result.AppendLine();}Console.WriteLine(result.ToString());}[DllImport("msi.dll", SetLastError = true)]static extern int MsiEnumProducts(int iProductIndex, StringBuilder lpProductBuf);[DllImport("msi.dll", SetLastError = true)]static extern int MsiGetProductInfo(string szProduct, string szProperty, StringBuilder lpValueBuf, ref int pcchValueBuf);

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