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SPBuiltInFieldId class

Retrieves identifiers for the fields that ship with Microsoft SharePoint Foundation.

System.Object
  Microsoft.SharePoint.SPBuiltInFieldId

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

public sealed class SPBuiltInFieldId

The following example is a console application that queries all Tasks lists in a site collection. The query string selects tasks that are assigned to the current user, ordered by date due. Note that the code gets the IDs for fields used in the query by accessing data members of the SPBuiltInFieldId class.

using System;
using System.Data;
using Microsoft.SharePoint;

namespace Test
{
   class ConsoleApp
   {
      static void Main(string[] args)
      {
         using (SPSite site = new SPSite("http://localhost"))
         {
            using (SPWeb web = site.OpenWeb())
            {
               // Get IDs for all fields used in the query.
               string assignedToId = SPBuiltInFieldId.AssignedTo.ToString("B");
               string taskDueDateId = SPBuiltInFieldId.TaskDueDate.ToString("B");
               string titleId = SPBuiltInFieldId.Title.ToString("B");
               string taskStatusId = SPBuiltInFieldId.TaskStatus.ToString("B");
               string percentCompleteId = SPBuiltInFieldId.PercentComplete.ToString("B");

               // Define the data selection.
               string where = "<Where><Eq>";
               where += "<FieldRef ID='" + assignedToId + "' />";
               where += "<Value Type='Integer'><UserID/></Value>";
               where += "</Eq></Where>";

               // Define the sort order.
               string orderBy = "<OrderBy>";
               orderBy += "<FieldRef ID='" + taskDueDateId + "' />";
               orderBy += "</OrderBy>";

               SPSiteDataQuery query = new SPSiteDataQuery();

               // Set the query string.
               query.Query = where + orderBy;

               // Query task lists.
               query.Lists = "<Lists ServerTemplate='107'/>";

               // Specify the view fields.
               query.ViewFields = "<FieldRef ID='" + titleId + "' />";
               query.ViewFields += "<FieldRef ID='" + taskDueDateId + "' Nullable='TRUE' />";
               query.ViewFields += "<FieldRef ID='" + taskStatusId + "' Nullable='TRUE' />";
               query.ViewFields += "<FieldRef ID='" + percentCompleteId + "' Nullable='TRUE' />";

               // Query all Web sites in this site collection.
               query.Webs = "<Webs Scope='SiteCollection'>";

               // Run the query.
               DataTable results = web.GetSiteData(query);

               // Print the results.
               Console.WriteLine("{0, -10} {1, -30} {2, -30} {3}", "Date Due", "Task", "Status", "% Complete");
               foreach (DataRow row in results.Rows)
               {
                  // Extract column values from the data table.
                  string dueDate = (string)row[taskDueDateId];
                  string task = (string)row[titleId];
                  string status = (string)row[taskStatusId];
                  string percentComplete = (string)row[percentCompleteId];

                  // Convert the due date to a short date string.
                  DateTime dt;
                  bool hasDate = DateTime.TryParse(dueDate, out dt);
                  if (hasDate)
                     dueDate = dt.ToShortDateString();
                  else
                     dueDate = String.Empty;

                  // Convert the PercentComplete field value to a percentage.
                  decimal pct;
                  bool hasValue = decimal.TryParse(percentComplete, out pct);
                  if (hasValue)
                     percentComplete = pct.ToString("P0");
                  else
                     percentComplete = "0 %";

                  // Print a line.
                  Console.WriteLine("{0, -10} {1, -30} {2, -30} {3, 10}", dueDate, task, status, percentComplete);
               }
            }
         }
         Console.ReadLine();
      }
   }
}

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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