C#判断某个软件是否已安装实现代码分享

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;  
}