Listview Handeling null returned values

Question

Hi,

I am querying Active Directory for Values, and returning them for a listview,

but if the Value does not exists it throws {"Object reference not set to an instance of an object."} System.NullReferenceException

which I want but in the list view I want a Null or blank value and it just aborts the query completely.

foreach (SearchResult searchResult in searchResultCollection)
      {
      //Add items in the listview
      string[] arr = new string[4];
      ListViewItem itm;


      /Add first item

      arr[0] = searchResult.GetDirectoryEntry().Properties["samaccountname"].Value.ToString();
      arr[1] = searchResult.GetDirectoryEntry().Properties["givenname"].Value.ToString();
      arr[2] = searchResult.GetDirectoryEntry().Properties["sn"].Value.ToString();
      arr[3] = searchResult.GetDirectoryEntry().Properties["displayname"].Value.ToString();
            itm = new ListViewItem(arr);
            userListview.Items.Add(itm);
  
       }
  

it just gives me an error on the display name since some accounts don't contain a display name

any assistance will do?

Answer 1

I think this will work

arr[0] = searchResult.GetDirectoryEntry().Properties["samaccountname"].Value.ToString() ?? string.Empty

Answer 2

Try the ‘?.’ operator:

   var p =  searchResult.GetDirectoryEntry().Properties; 
   arr[0] = p["samaccountname"]?.Value?.ToString();
   . . .

If null results should be converted to empty strings, then:

   arr[0] = p["samaccountname"]?.Value?.ToString() ?? string.Empty;

Answer 3

Awesome,

that simple

Thanks You Very Much!!!