Error During import user from AD to my custom webpart.

Question

I am trying to get user from active directory in my webpart but i am sruck somewhere please help me my code is as below.

using System; using System.Runtime.InteropServices; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Serialization; using System.DirectoryServices; using Microsoft.SharePoint; using Microsoft.SharePoint.WebControls; using Microsoft.SharePoint.WebPartPages; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Collections.Specialized; using System.Collections;

namespace LdapTest2008 { [Guid("028042d8-7f77-4674-8b19-61b282e5ddf8")] public class LdapTest2008 : System.Web.UI.WebControls.WebParts.WebPart { public LdapTest2008() { }

    Label lblUsers = new Label();

    protected override void CreateChildControls()
    {
        base.CreateChildControls();

        // TODO: add custom rendering code here.
        // Label label = new Label();
        // label.Text = "Hello World";
        // this.Controls.Add(label);
    }

    public override void RenderControl(HtmlTextWriter writer)
    {
        base.RenderControl(writer);
        StringCollection StrCollectionReturn = new StringCollection();
        string strGroup = "My Group";

       StrCollectionReturn= GetGroupMembers(strGroup);

       lblUsers.Text = StrCollectionReturn.ToString();
       this.Controls.Add(lblUsers);
       writer.Write(lblUsers.Text);

    }


    //Query Active Directory to get users from Active Directory Groups
        public StringCollection GetGroupMembers(string strGroup)

        {
            string domain = "LDAP://Domain.COM";

            string domainAndUsername = "Domain.COM\\username";
            string passWord = "password";
            StringCollection groupMemebers = new StringCollection(); 


        try

        {
                        DirectoryEntry ent = new DirectoryEntry(domain,domainAndUsername,passWord);

                        DirectorySearcher srch = new DirectorySearcher("(CN=" + strGroup + ")");
                        srch.SizeLimit = 0;
                        srch.PageSize = 1000;

                        SearchResultCollection coll = srch.FindAll();

                        foreach (SearchResult rs in coll)
                        {
                            ResultPropertyCollection resultPropColl = default(ResultPropertyCollection);
                            resultPropColl = rs.Properties;


                            foreach (Object memberColl in resultPropColl["member"])
                            {
                                DirectoryEntry gpMemberEntry = new DirectoryEntry("LDAP://"+ memberColl);

                                System.DirectoryServices.PropertyCollection userProps = gpMemberEntry.Properties;

                                //getting user properties from AD

                                object obVal = userProps["displayName"].Value;

                                object obAcc = userProps["sAMAccountName"].Value;

                                if (null != obVal)
                                {

                                    groupMemebers.Add("User Name:" + obAcc.ToString() + ", User login name:" + obVal.ToString() + "<br>");
                                }
                            }
                        }
           }


                    catch (Exception ex)

                    {
                        ex.GetBaseException();
                       // writer.Write(ex.Message);
                    }



              return groupMemebers;

        }
}

}

When debug this code i stuck here DirectorySearcher srch = new DirectorySearcher("(CN=" + strGroup + ")"); it give me error found null value.

What i am doing wrong please help on this.

Thank you.

Answer 1

Hi,

maybe strGroup is empty? Debug and see what it contains.

Also might wanna test that same string in a LDAPtool to see if it brings out any results like that, if strGroup isn't empty.

---

Well I think you're using the classes the wrong way. And you're LDAP string might be wrong too.

Here's an example of a the DirectorySearcher-class: http://msdn.microsoft.com/en-us/library/ms180885(VS.80).aspx

Here's another with the same Exception you were getting: http://forums.asp.net/p/322041/322460.aspx

Answer 2

Hello JavaPete,

Thanks for your reply.

i have made one silly mistake i forgot to pass Directory Entry object to searcher.

e.g. DirectorySearcher srch = new DirectorySearcher(ent, "(CN=" + strGroup + ")"); ,

Now it's work but now i got error in

DirectoryEntry gpMemberEntry = new DirectoryEntry("LDAP://"+ memberColl); I have also tried by passing domain name also

e.g. DirectoryEntry gpMemberEntry = new DirectoryEntry("LDAP://DomainName"+ memberColl);

But still it give me error "threw an exception of type 'System.Runtime.InteropServices.COMException'

Please help on this.