C#操作AD域之测试域连接

C#操作域的第一步便是测试程序是否能成功连接到域，通过LDAP协议，可以非常简单的测试域连接的情况。代码如下

/// </summary>  
/// <param name="domainName">域名或IP</param>  
/// <param name="userName">用户名</param>  
/// <param name="userPwd">密码</param>  
/// <param name="entry">域</param>  
/// <returns></returns>  
public string IsConnect(string domainName, string userName, string userPwd, out DirectoryEntry domain)  
{  
    domain = new DirectoryEntry();  
    try  
    {  
        domain.Path = string.Format("LDAP://{0}", domainName);//LDAP是轻量目录访问协议  
        domain.Username = userName;  
        domain.Password = userPwd;  
        domain.AuthenticationType = AuthenticationTypes.Secure;//身份验证的类型  
        domain.RefreshCache();//将此DirectoryEntry 对象的属性值加载到属性缓存中  
        return "测试连接成功！";  
    }  
    catch (Exception ex)  
    {  
        return "[IsConnected方法]错误信息：" + ex.Message;  
    }  
}