Lerning Entity Framework 6 ------ Using a commandInterceptor

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Sometimes, We want to check the original sql statements. creating a commandInterceptor is a good way to do this.

Add a class named MyCommandInterceptor

class MyCommandInterceptor: DbCommandInterceptor
{
    public override void NonQueryExecuted(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
    {
        base.NonQueryExecuted(command, interceptionContext);
        Console.WriteLine(command.CommandText);
    }
    public override void ReaderExecuted(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
    {
        base.ReaderExecuted(command, interceptionContext);
        Console.WriteLine(command.CommandText);
    }
    public override void ScalarExecuted(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
    {
        base.ScalarExecuted(command, interceptionContext);
        Console.WriteLine(command.CommandText);
    }
}

The namespace System.Data.Entity.Infrastructure.Interception is needed. Then Add DbInterception.Add(new MyCommandInterceptor()); in your constructor of DbContext class:

public class MyDb:DbContext
{
    public MyDb():base("name=TestDb")
    {
        DbInterception.Add(new MyCommandInterceptor());
    }
    public IDbSet<User> Users { get; set; }
}

It's all.