How to write a CAML query to find out a list of items with ID

Hi,

Few days ago I came around a problem where I have to query a SharePoint list for a bunch of items and I only have the ID for those. The ID field is a counter. I am using the WebService.GetListItems method for the query.

By googleing I came to know that I have to write the query in the following manner to fetch 1 item:

<Where>
 <Eq>
  <FieldRef Name=’ID’/>
  <Value Type=’Counter’>” + _slideid + “</Value>
 </Eq>
</Where>

Where the slide id is one of the IDs of from the slide list.

The query worked well but I wanted to extend it for n number of items. i.e. If I have a Slide ID array, I want to get the Items in one query. Here is the code snippet that does the trick:

XmlNodeList GetFilteredNodesFromSharepointBySlideID(string _tmpListName, string _tmpViewName, string[] _slideid)
        {
            XmlNodeList _tmplNodeLists = null;

            try
            { 

                XmlDocument doc = new XmlDocument();

                XmlNode query = doc.CreateNode(XmlNodeType.Element, “Query”, “”);

                String _query = “<Where>”;
                String _innerQ = “”;
                string _tempQ = “”;

                for (int i = 0; i < _slideid.Length; i++)
                {
                    _tempQ += “<Eq><FieldRef Name=’ID’/><Value Type=’Counter’>” + _slideid[i] + “</Value></Eq>”;

                    if (i >= 1)
                    {
                        _innerQ = “<Or>” + _tempQ + “</Or>”;
                        _tempQ = _innerQ;
                    }                   
                }

                _query += _tempQ + “</Where>”;

                query.InnerXml = _query;
              

                XmlNode templistItems =
                  MyWebService.GetListItems(_tmpListName, _tmpViewName, query,
                  null, null, null, null); //MyWebService is the Configured Web Service               

                doc.LoadXml(templistItems.OuterXml);

                _tmplNodeLists = doc.GetElementsByTagName(“z:row”); // Now you can return the node list as XMLNodes.

             }
            catch (Exception _e)
            {
                throw _e;
            }

            return _tmplNodeLists;
        }

 



I tried to input the slide ids 19,20,21,22,23 and the output of the CAML query is like below:

<Where>
  <Or>
   <Or>
    <Or>
     <Or>
      <Eq>
        <FieldRef Name=”ID” />
        <Value Type=”Counter”>19</Value>
       </Eq>
      <Eq>
        <FieldRef Name=”ID” />
        <Value Type=”Counter”>20</Value>
       </Eq>
     </Or>
      <Eq>
       <FieldRef Name=”ID” />
       <Value Type=”Counter”>21</Value>
      </Eq>
     </Or>
     <Eq>
      <FieldRef Name=”ID” />
      <Value Type=”Counter”>22</Value>
     </Eq>
    </Or>
    <Eq>
     <FieldRef Name=”ID” />
     <Value Type=”Counter”>23</Value>
    </Eq>
   </Or>
</Where>

I hope you can understand the utility of the script now. You can now extend it as you like.

Happy coding!