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)

'Declaration
Public NotInheritable Class SPBuiltInFieldId
'Usage
Dim instance As SPBuiltInFieldId

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("https://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();
      }
   }
}

Imports System
Imports System.Data
Imports Microsoft.SharePoint

Module ConsoleApp
   Sub Main()
      Using site As SPSite = New SPSite("https://localhost")
         Using web As SPWeb = site.OpenWeb()

            ' Get IDs for all fields used in the query.
            Dim assignedToId As String = SPBuiltInFieldId.AssignedTo.ToString("B")
            Dim taskDueDateId As String = SPBuiltInFieldId.TaskDueDate.ToString("B")
            Dim titleId As String = SPBuiltInFieldId.Title.ToString("B")
            Dim taskStatusId As String = SPBuiltInFieldId.TaskStatus.ToString("B")
            Dim percentCompleteId As String = SPBuiltInFieldId.PercentComplete.ToString("B")

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

            ' Define the sort order.
            Dim orderBy As String = "<OrderBy>"
            orderBy += "<FieldRef ID='" + taskDueDateId + "' />"
            orderBy += "</OrderBy>"

            Dim query As SPSiteDataQuery = 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.
            Dim results As DataTable = web.GetSiteData(query)

            ' Print the results.
            Console.WriteLine("{0, -10} {1, -30} {2, -30} {3}", "Date Due", "Task", "Status", "% Complete")
            Dim row As DataRow
            For Each row In results.Rows
               ' Extract column values from the data table.
               Dim dueDate As String = CType(row(taskDueDateId), String)
               Dim task As String = CType(row(titleId), String)
               Dim status As String = CType(row(taskStatusId), String)
               Dim percentComplete As String = CType(row(percentCompleteId), String)

               ' Convert the due date to a short date.
               Dim dt As DateTime
               Dim hasDate As Boolean = DateTime.TryParse(dueDate, dt)
               If hasDate Then
                  dueDate = dt.ToShortDateString()
               Else
                  dueDate = String.Empty
               End If

               ' Convert the PercentComplete field value to a percentage.
               Dim pct As Decimal
               Dim hasValue As Boolean = Decimal.TryParse(percentComplete, pct)
               If hasValue Then
                  percentComplete = pct.ToString("P0")
               Else
                  percentComplete = "0 %"
               End If

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

         End Using
      End Using
      Console.ReadLine()
   End Sub
End Module

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

SPBuiltInFieldId members

Microsoft.SharePoint namespace