private void button1_Click(object sender, EventArgs e) { if (checkAdobeReader() == true) { MessageBox.Show("有安裝 Adobe Reader "); } else { MessageBox.Show("沒有安裝 Adobe Reader "); } } /// <summary> /// 確認是否有安裝 Adobe Reader /// </summary> /// <returns>true: 有安裝, false:沒有安裝</returns> private bool checkAdobeReader() { 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("Adobe Reader")) { return true; // MessageBox.Show(displayName.ToString()); } } } return false; }