C# AD登入验证

private static DirectoryEntry GetDirectoryObject()
        {
            DirectoryEntry entry = null;
            try
            {
                entry = new DirectoryEntry("LDAP://dcs601:389/DC=sunwill,DC=com,DC=cn", "test", "testpwd", AuthenticationTypes.Secure);
            }
            catch (Exception ex)
            {

            }
            return entry;
        }
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private void Form1_Load(object sender, EventArgs e)
        {
            DirectoryEntry entry = GetDirectoryObject();
            DirectorySearcher search = new DirectorySearcher(entry);

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//这里的customer是登入账号
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    search.Filter = "(SAMAccountName=" + "test" + ")";
    try
    {
        SearchResult result = search.FindOne();
        if (result != null)
        {
             MessageBox.Show("成功");
             MessageBox.Show(result.Path.ToString());
        }
    }
    catch(Exception e1)
    {
        MessageBox.Show(e1.Message);
    }

}

1.添加引用System.DirectoryServices
2.using System.DirectoryServices;
3.特别要注意AD连接字串的LDAP必须大写，否则会出现未知错误
4.当登入AD的账号密码不匹配时会出现未知的用户名或密码错误。
5.在asp.net里也测试正常通过。