用C#读取Windows注册表中的多重字串和二进制字串

//读取Windows安装盘目录
//Installation Sources是个REG_MULTI_SZ：多重字串，直接转string读不出
string[] key = (string[])Registry.LocalMachine.OpenSubKey(
  @"SOFTWAREMicrosoftWindowsCurrentVersionSetup").GetValue("Installation Sources");
treeView1.Nodes[0].Nodes[4].Nodes[3].Nodes.Add("安装盘目录：" + 
  key.GetValue(0).ToString()); 
//读取DirectX版本
//directX是个REG_BINARY类型，必须转换得到它正确的值
byte[] array = (byte[])Registry.LocalMachine.OpenSubKey(
  @"SOFTWAREMICROSOFTDirectX").GetValue("InstalledVersion");
//byte array1 = (byte)array.GetValue(0);
string sDirectX = "DirectX ";
for (int i = 0; i < array.Length; i++)
...{
if (array[i] != 0)
...
}
string sVer= Registry.LocalMachine.OpenSubKey(
  @"SOFTWAREMICROSOFTDirectX").GetValue("Version").ToString();
sDirectX += " ("+sVer+")";