January 2017
Intermediate to advanced
314 pages
6h 42m
English
Content preview from .NET Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Factory pattern in the .NET BCL
The factory design pattern has been used by System.Data.Common to create an instance of the provider, connection, command, or adapter objects in order to fetch data from a relational database. The following code snippets demonstrates the idea:
DbProviderFactory factory = DbProviderFactories.GetFactory(providerName); DbConnection connection = factory.CreateConnection(); connection.ConnectionString = connectionString; string queryString = "SELECT CategoryName FROM Categories"; DbCommand command = factory.CreateCommand(); command.CommandText = queryString; command.Connection = connection; DbDataAdapter adapter = factory.CreateDataAdapter(); adapter.SelectCommand = command; DataTable table = new DataTable(); adapter.Fill(table); ...
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