ColumnAttribute.IsLookupId property
Gets or sets a value that indicates whether the property represents the Id of the list item that provides the value for the property that represents the looked-up value.
Namespace: Microsoft.SharePoint.Linq
Assembly: Microsoft.SharePoint.Linq (in Microsoft.SharePoint.Linq.dll)
Syntax
'Declaration
Public Property IsLookupId As Boolean
Get
Set
'Usage
Dim instance As ColumnAttribute
Dim value As Boolean
value = instance.IsLookupId
instance.IsLookupId = value
public bool IsLookupId { get; set; }
Property value
Type: System.Boolean
true, if the property represents the Id of the same item in the lookup target list that provides the value for the Lookup field; false otherwise.
Remarks
For example, a Team Members list has a Manager column that is a lookup field to a Managers list. The property representing the Manager column has a ColumnAttribute with IsLookupValue set to true. But there is also a ManagerID property that is decorated with a ColumnAttribute (even if there is no ManagerID column in the content type) with the IsLookupId set to true.
Examples
The following example shows IsLookupId and IsLookupValue in use:
[ContentType(Name="Item", Id="0x01", List="Team Members")]
[DataContract()]
public partial class TeamMembersItem : Item {
{
[DataMember()]
private LookupList<System.Nullable<int>> _managerId;
[DataMember()]
private LookupList<string> _managerTitle
[Column(Name="Manager", Storage="_managerId", FieldType="User", IsLookupId=true, LookupDisplayColumn="Title")]
public IList<System.Nullable<int>> ManagerId {
get {
return this._managerId;
}
set {
this._managerId.Assign(value);
}
}
[Column(Name="Manager", Storage="_managerTitle", ReadOnly=true, FieldType="User", IsLookupValue=true, LookupDisplayColumn="Title")]
public IList<string> ManagerTitle {
get {
return this._managerTitle;
}
set {
this._managerTitle.Assign(value);
}
}
// Other members omitted for readability.
}