/// <summary>
/// Instantiate and return a class conforming to the IDependentClass interface:
/// which class gets instantiated depends on the ClassName setting in
/// the configuration file
/// </summary>
/// <returns>Class conforming to the IDependentClass interface</returns>
static IDependentClass GetCorrectDependency()
{
string classToCreate = System.Configuration.ConfigurationManager.AppSettings["ClassName"];
Type type = System.Type.GetType(classToCreate);
IDependentClass dependency = (IDependentClass)Activator.CreateInstance(type);
return(dependency);
}
static void Main(string[] args)
{
// Get the correct dependency based on configuration file
IDependentClass dependency = GetCorrectDependency();
// Create our main class and inject the dependency
MainClass mainClass = new MainClass(dependency);
// Use the main class, the method references the dependency
// so behaviour depends on the configuration file
mainClass.DoSomething();
Console.ReadLine();
}
public void InjectDependent(IDependentClass dependentClass)
{
this.dependentClass = dependentClass;
}
public DependencyClass(IDependentClass client)
{
}
public MainClass(IDependentClass dependentClass)
{
this.dependentClass = dependentClass;
}
