在这种情况下如何使用温莎城堡类型的工厂
本文关键字:城堡 类型 工厂 这种情况下 何使用 | 更新日期: 2023-09-27 18:05:41
简单的DI示例:
public interface INumberToWordConverter
{
string ConvertNumber(int number);
}
public interface IOutputManager
{
void Write<T>(string who, T what);
}
public interface INumberProvider
{
int GenerateNumber();
}
public class PlayWithDI
{
private IOutputManager _outputManagerService;
private INumberProvider _numberProviderService;
private INumberToWordConverter _numberToWordConverterService;
private PlayWithDI() { }
public PlayWithDI(
IOutputManager outputManagerService,
INumberProvider numberProviderService,
INumberToWordConverter numberToWordConverterService)
{
if (outputManagerService == null)
throw new ArgumentNullException(nameof(outputManagerService));
if (numberProviderService == null)
throw new ArgumentNullException(nameof(numberProviderService));
if (numberToWordConverterService == null)
throw new ArgumentNullException(nameof(numberToWordConverterService));
_outputManagerService = outputManagerService;
_numberProviderService = numberProviderService;
_numberToWordConverterService = numberToWordConverterService;
}
public void Execute()
{
int number = _numberProviderService.GenerateNumber();
string wordOfNumber = _numberToWordConverterService.ConvertNumber(number);
_outputManagerService.Write(nameof(PlayWithDI), wordOfNumber);
}
示例实现(仅为函数):
// Implements INumberProvider
public RandomNumberProvider(
int min, int max,
IOutputManager outputManagerService)
{
...
}
// Implements INumberToWordConverter
public ItalianNumberToWordConverter(
IOutputManager outputManagerService)
{
...
}
// Implements IConsoleManager
public ConsoleOutputManager()
{
...
}
如果我知道哪个min
和max
给了RandomNumberProvider
,我就像这样解析:
public void Install(
IWindsorContainer container,
IConfigurationStore store)
{
container.Register(
Component.For<PlayWithDI>());
container.Register(
Component.For<IOutputManager>()
.ImplementedBy<ConsoleOutputManager>());
container.Register(
Component.For<INumberProvider>()
.ImplementedBy<RandomNumberProvider>()
.DependsOn(
Dependency.OnValue("min", 2),
Dependency.OnValue("max", 20)));
container.Register(
Component.For<INumberToWordConverter>()
.ImplementedBy<ItalianNumberToWordConverter>());
}
...
container.Install(new DependenciesConfiguration1());
var testDI = container.Resolve<PlayWithDI>();
testDI.Execute();
当我想在运行时为RandomNumberProvider
提供自定义参数时,问题就出现了。
我看了看TypedFactory
,但在这个例子中我真的不理解它,因为如果我先解决一个工厂,我应该如何解决PlayWithDi?我应该传递给它的构造器INumberProviderFactory而不是INumberProvider吗?
在这种情况下,我想到了这样一个工厂:
public interface INumberProviderFactory
{
INumberProvider Create(
IOutputManager outputManager,
int min, int max);
}
当我调用Create
时,我该如何解决outputManager
呢?我困惑。
当我想在运行时给RandomNumberProvider自定义参数时,问题就出现了。
这就是你错的地方。在构造期间向组件注入运行时数据是一种反模式:
不要在构建过程中向应用程序组件注入运行时数据;它会导致歧义,使组合根具有额外的责任,并且使验证DI配置的正确性变得异常困难。[…让运行时数据流过构造对象图的方法调用。
换句话说,您的RandomNumberProvider
应该接受min
和max
参数作为GenerateNumber
方法的输入参数。