Question

I have 2 classes with a LINQ association between them i.e.:

Table1:       Table2: ID            ID Name          Description               ForiegnID 

The association here is between Table1.ID -> Table2.ForiegnID

I need to be able to change the value of Table2.ForiegnID, however I can’t and think it is because of the association (as when I remove it, it works).

Therefore, does anyone know how I can change the value of the associated field Table2.ForiegnID?

Answer 1

Check out the designer.cs file. This is the key’s property

[Column(Storage='_ParentKey', DbType='Int')] public System.Nullable<int> ParentKey {     get     {         return this._ParentKey;     }     set     {         if ((this._ParentKey != value))         {             //This code is added by the association             if (this._Parent.HasLoadedOrAssignedValue)             {                 throw new System.Data.Linq.ForeignKeyReferenceAlreadyHasValueException();             }             //This code is present regardless of association             this.OnParentKeyChanging(value);             this.SendPropertyChanging();             this._ParentKey = value;             this.SendPropertyChanged('ParentKey');             this.OnServiceAddrIDChanged();         }     } } 

And this is the associations property.

[Association(Name='Parent_Child', Storage='_Parent', ThisKey='ParentKey', IsForeignKey=true, DeleteRule='CASCADE')] public Parent Parent {     get     {         return this._Parent.Entity;     }     set     {         Parent previousValue = this._Parent.Entity;         if (((previousValue != value)                      || (this._Parent.HasLoadedOrAssignedValue == false)))         {             this.SendPropertyChanging();             if ((previousValue != null))             {                 this._Parent.Entity = null;                 previousValue.Exemptions.Remove(this);             }             this._Parent.Entity = value;             if ((value != null))             {                 value.Exemptions.Add(this);                 this._ParentKey = value.ParentKey;             }             else             {                 this._ParentKey = default(Nullable<int>);             }             this.SendPropertyChanged('Parent');         }     } } 

It’s best to assign changes through the association instead of the key. That way, you don’t have to worry about whether the parent is loaded.