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SPField.RelatedField Property

SharePoint 2010

Gets or sets the internal name of a field to which the current field is related.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
C#
VB
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public string RelatedField { get; set; }

Property Value

Type: System.String
A string that contains the name of the field to which the current field is related.
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In case of a BCS / BDC field
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In case of a BCS / BDC field
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SPBusinessDataField.RelatedField
The SPBusinessDataField.RelatedField property stores the name of the related field where the primary key of the business data entity is stored. The value identifies the selected item, which is displayed by the field for the current SPListItem.

The identifier is in BDC form and can be converted to the identifier(s) of the external data object with:
object[] externalId = EntityInstanceIdEncoder.DecodeEntityInstanceId((string)item[field.RelatedField]);
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