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Entity & relation (foreign key , cascade , delete , update) (linq, entity framework) ในการใบ้ entity framework สามารถอ้างถึง table และ attribute field ใน table บนิดของ data type ได้อย่างถูกต้อง ไม่มีปัญหาเรื่อง. Currently i infer the foreign key values by modifying the expression tree to bring in the foreign key's related object and then extracting its primary key but this is a very convoluted and ugly process. is there any reason linq to entities cannot expose foreign key values as readonly properties if i mark up the csdl file appropriately?. That will work. it's normal because the second "from" inquires in the pc's set of the users and the third "from", the apps set of the pcs. and i guess that is not going generate a cross join as t-sql, because the conditions are already defined in the foreign keys and associations..

Scottgu's blog - using linq to sql (part 1)

I am using vb.net with linq. i have 2 tables tablea and tableb. tablea is linked to tableb with a foreign key column linqid. no i need to update the value of this column in tablea.. Ado.net entity framework and linq to entities https: "the property 'cid' is read-only because it is part of the entity's key." is there a way to update an entity's primary key? given that you have multiple relationships in your database which use foreign keys to refer to this identity, if it were possible to change this then you would. In this windows form tutorial, we will get the data from foreign key columns. by using model first approach, create model class and context class. using single linq query we have to retrieve items.

linq to entities update foreign key

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