AssociationAttribute.IsUnique Property   
Definition
Important
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Gets or sets the indication of a uniqueness constraint on the foreign key.
public:
 property bool IsUnique { bool get(); void set(bool value); };public bool IsUnique { get; set; }member this.IsUnique : bool with get, setPublic Property IsUnique As BooleanProperty Value
Default = false.
Remarks
When true, this property indicates a true 1:1 relationship.