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;??
}?

總結

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