C#+EF,使用DbContext创建DbCommand

using (var context = WorkflowDbContext.CreateDbContext(this.DbOption.ConnectionString))
{
    var sql = $"IF {expression} SELECT 1 ELSE SELECT 0;";
    var cmd = context.Database.Connection.CreateCommand();//创建DbCommand
    cmd.CommandText = sql;
    context.Database.Connection.Open();
    var obj = cmd.ExecuteScalar();
    return obj.ToString() == "1";
}