SPFieldLookupValueCollection class
Contains the values for an SPFieldLookup object that can contain multiple values.
Inheritance hierarchy
System.Object
System.Collections.Generic.List<SPFieldLookupValue>
Microsoft.SharePoint.SPFieldLookupValueCollection
Namespace: Microsoft.SharePoint
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Syntax
'Declaration
<SerializableAttribute> _
Public Class SPFieldLookupValueCollection _
Inherits List(Of SPFieldLookupValue) _
Implements ISerializable
'Usage
Dim instance As SPFieldLookupValueCollection
[SerializableAttribute]
public class SPFieldLookupValueCollection : List<SPFieldLookupValue>,
ISerializable
Examples
The following example shows how to read the value of a multi-value lookup field. The example is a console application that iterates over the items on the Task list. The code looks at the Predecessors field in each item and prints the title of the item, the number of predecessors, and the title and task number of each predecessor.
using System;
using Microsoft.SharePoint;
namespace ConsoleApp
{
class Program
{
static void Main(string[] args)
{
using (SPSite site = new SPSite("https://localhost"))
{
using (SPWeb web = site.OpenWeb())
{
SPList list = web.Lists.TryGetList("Tasks");
if (list != null)
{
foreach (SPListItem item in list.Items)
{
// Get the predecessors.
string rawvalue = item[SPBuiltInFieldId.Predecessors].ToString();
// Print information about the task.
SPFieldLookupValueCollection values = new SPFieldLookupValueCollection(rawvalue);
Console.WriteLine("\nTask {0}: {1}", item.ID, item.Title);
Console.WriteLine("\tPredecessors: {0}", values.Count);
// Print the predecessors.
foreach (SPFieldLookupValue value in values)
Console.WriteLine("\t{0} (Task {1})", value.LookupValue, value.LookupId);
}
}
}
}
Console.Write("\nPress ENTER to continue....");
Console.Read();
}
}
}
Imports System
Imports Microsoft.SharePoint
Module ConsoleApp
Sub Main()
Using site As New SPSite("https://localhost")
Using web As SPWeb = site.OpenWeb()
Dim list As SPList = web.Lists.TryGetList("Tasks")
If list IsNot Nothing Then
For Each item As SPListItem In list.Items
' Get the predecessors.
Dim rawvalue As String = item(SPBuiltInFieldId.Predecessors).ToString()
' Print information about the task.
Dim values As New SPFieldLookupValueCollection(rawvalue)
Console.WriteLine(vbLf & "Task {0}: {1}", item.ID, item.Title)
Console.WriteLine(vbTab & "Predecessors: {0}", values.Count)
' Print the predecessors.
For Each value As SPFieldLookupValue In values
Console.WriteLine(vbTab & "{0} (Task {1})", value.LookupValue, value.LookupId)
Next
Next
End If
End Using
End Using
Console.Write(vbCrLf & "Press ENTER to continue....")
Console.Read()
End Sub
End Module
The following example shows how to write the value of a multi-value lookup field. The example is a console application that looks for an Issues list in the site collection's root website. If an Issue list is found, the application adds two new items to the list and sets the value of the Related Items field in each item.
using System;
using Microsoft.SharePoint;
namespace ConsoleApp
{
class Program
{
static void Main(string[] args)
{
using (SPSite site = new SPSite("https://localhost"))
{
using (SPWeb web = site.RootWeb)
{
SPList list = null;
foreach (SPList webList in web.Lists)
{
if (webList.BaseType == SPBaseType.Issue)
{
list = webList;
break;
}
}
if (list != null)
{
SPListItemCollection items = list.Items;
SPFieldLookupValueCollection relatedItems = new SPFieldLookupValueCollection();
SPListItem firstItem = items.Add();
firstItem[SPBuiltInFieldId.Title] = "The first issue";
firstItem.Update();
SPFieldLookupValue firstLookupValue = new SPFieldLookupValue(firstItem.ID, firstItem.Title);
relatedItems.Add(firstLookupValue);
SPListItem secondItem = items.Add();
secondItem[SPBuiltInFieldId.Title] = "The second issue";
secondItem[SPBuiltInFieldId.RelatedIssues] = relatedItems.ToString();
secondItem.Update();
relatedItems.Remove(firstLookupValue);
relatedItems.Add(new SPFieldLookupValue(secondItem.ID, secondItem.Title));
firstItem[SPBuiltInFieldId.RelatedIssues] = relatedItems.ToString();
firstItem.Update();
}
}
}
}
}
}
Imports System
Imports Microsoft.SharePoint
Module ConsoleApp
Sub Main()
Using site As New SPSite("https://localhost")
Using web As SPWeb = site.OpenWeb()
Dim list As SPList = Nothing
For Each webList As SPList In web.Lists
If webList.BaseType = SPBaseType.Issue Then
list = webList
Exit For
End If
Next
If list IsNot Nothing Then
Dim items As SPListItemCollection = list.Items
Dim relatedItems As New SPFieldLookupValueCollection()
Dim firstItem As SPListItem = items.Add()
firstItem(SPBuiltInFieldId.Title) = "The first issue"
firstItem.Update()
Dim firstLookupValue As New SPFieldLookupValue(firstItem.ID, firstItem.Title)
relatedItems.Add(firstLookupValue)
Dim secondItem As SPListItem = items.Add()
secondItem(SPBuiltInFieldId.Title) = "The second issue"
secondItem(SPBuiltInFieldId.RelatedIssues) = relatedItems.ToString()
secondItem.Update()
relatedItems.Remove(firstLookupValue)
relatedItems.Add(New SPFieldLookupValue(secondItem.ID, secondItem.Title))
firstItem(SPBuiltInFieldId.RelatedIssues) = relatedItems.ToString()
firstItem.Update()
End If
End Using
End Using
End Sub
End Module
Thread safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.