Utilizzando una classe LinqToSql per interagire con un database è estremamente utile avere la possibilità di richiamare un'entità per il suo id. Di base l'unico modo per farlo è chiamare il metodo SingleOrDefault o FirstOrDefault sulla tabella con un'opportuna lambda expression, ad esempio:

table.FirstOrDefault(p => p.id == idEntita);
Per quanto il codice sia breve e semplice sarebbe utile avere un metodo del tipo:

Un metodo del genere dovrebbe essere ovviamente generico per poter funzionare su tutte le entità del db, la prima ovvia (e ingenua) implementazione potrebbe essere: 

public static T GetById<T>(this System.Data.Linq.Table<T> table, int id)
    return table.FirstOrDefault(p => p.id == id);
Ovviamente abbiamo un extension method in quanto lo vogliamo su tutte le tabelle ma comunque non può funzionare in questo modo perché T è una classe generica e quindi non possiamo accedere alla proprietà id.
Gli expression trees ci permettono di costruire una lambda expression a runtime e quindi di implementare il metodo generico:
public static T GetById<T>(this System.Data.Linq.Table<T> table, int id)
    ParameterExpression par = Expression.Parameter(typeof(T), "p");
    Expression preExpr = par;
    preExpr = Expression.Property(preExpr, "id");
    ConstantExpression idEntita = Expression.Constant(id, typeof(int));
    BinaryExpression expr = Expression.Equal(preExpr, idEntita);
    Expression<Func<T, bool>> finalExpr = Expression.Lambda<Func<T, bool>>(
        new ParameterExpression[] { par }
    return table.FirstOrDefault(finalExpr);

Ci sono 2 questioni che vanno valutate con attenzione:

- il metodo così come è fatto sarà presente su tutte le tabelle di LinqToSql anche quelle senza id. Perdiamo quindi la sicurezza della compilazione.
- c'è un leggero overhead.
A nostro avviso il vero punto problematico è il primo perché potrebbero verificarsi errori a runtime in quanto si è rinunciato allo "static type checking" di C#. L'overhead è sicuramente trascurabile.

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