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SPField class

Represents a field in a list on a SharePoint Foundation Web site.

System.Object
  Microsoft.SharePoint.SPField
    

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

public class SPField

Use the Fields property of either the SPList class or the SPListItem class to return an SPFieldCollection object that represents the collection of fields for a list or list item. Use an indexer to return a single field from this collection. For example, if the collection is assigned to a variable named collFields, use collFields[index] in C#, or collFields(index) in Microsoft Visual Basic, where index is either the index number of the field in the collection or the display name of the field.

If you set properties of the SPField class and its inheriting classes, you must call the Update method for changes to take effect in the database.

The following example is a console application that gets a reference to the Expires field in the Announcements list and sets the default expiration date to one week after an item is created.

using System;
using Microsoft.SharePoint;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            using (SPSite site = new SPSite("http://localhost"))
            {
                using (SPWeb web = site.RootWeb)
                {
                    SPList list = web.Lists.TryGetList("Announcements");
                    if (list != null)
                    {
                        SPField fld = list.Fields[SPBuiltInFieldId.Expires];
                        fld.DefaultFormula = "=TODAY()+7";
                        fld.Update();
                    }
                }
            }
            Console.Write("\nPress ENTER to continue....");
            Console.Read();
        }
    }
}

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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