Enterprise Library Test Guide - Willy .Net

Using the Test Cases 251
Test Case
The test case first created a dictionary configuration source and then added the
connection string to the section. It then used the DatabaseProviderFactory
class to create a Database instance. The test case passed the dictionary
configuration source as a parameter.
Problem
The test case failed with the following exception:
System.Configuration.ConfigurationErrorsException: The requested database instance is not
defined in configuration.
The application block used the DatabaseConfigurationView.GetConnectionString-
Settings method to read the relevant configuration section. This class relies on the.
NET Framework ConfigurationManager class, which only reads configuration files.
The following is the code that caused the problem.
public ConnectionStringSettings GetConnectionStringSettings(string name)
{
ConnectionStringSettings connectionStringSettings = ConfigurationManager.
ConnectionStrings[name];
…
}
Solution
The application block should be able to read configuration information from any
configuration source. If the configuration information is not defined in the specified
configuration source, the application block should use the ConfigurationManager
class to look in the configuration file. This is shown in the following code.
public ConnectionStringSettings GetConnectionStringSettings(string name)
{
…
ConnectionStringSettings connectionStringSettings;
ConfigurationSection configSection = configurationSource.GetSection("connectionStrin
gs");
if ((configSection != null) && (configSection is ConnectionStringsSection))
{
ConnectionStringsSection connectionStringsSection = configSection as Connection-
StringsSection;
connectionStringSettings = connectionStringsSection.ConnectionStrings[name];
}
else
connectionStringSettings = ConfigurationManager.ConnectionStrings[name];
…
}