我有一个应用程序使用统一固件来解决对象。 我也做了一些变化框架并且可以作为“新的变化”统一使用默认构造函数和参数化构造函数c#
包装类看起来像
public static class ContractResolver
{
public static T Resolve<T>() //This is been used in many places in application
{
IUnityContainer container = new UnityContainer();
var section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
section.Containers.Default.Configure(container);
return container.Resolve<T>();
}
//NEW CHANGE: This is the new function that suppose to return the instance of parameterised constructor
public static T Resolve<T>(ParameterOverride[] parameterOverrides)
{
IUnityContainer container = new UnityContainer();
var section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
section.Containers.Default.Configure(container);
return container.Resolve<T>(parameterOverrides);
}
}
的配置类似
代码注释中看到的类<unity>
<containers>
<container>
<types>
<type type ="UnityTest.IImageRepositoryService, UnityTest" mapTo="UnityTest.ImageRepositoryService, UnityTest"/>
</types>
</container>
</containers>
</unity>
的类和接口看起来像
public interface IImageRepositoryService
{
bool Exists(string imageName);
}
public class ImageRepositoryService : IImageRepositoryService
{
private readonly string mFilterName = "StandardImageFilter";
//[InjectionConstructor]
public ImageRepositoryService()
{
DatabaseQueryProvider.Query("Image", mFilterName);
}
//NEW CHANGE. A CONSTRUCTOR THAT ACCEPTS A PARAMETER
//[InjectionConstructor]
public ImageRepositoryService(string filterName)
{
mFilterName = filterName;
DatabaseQueryProvider.Query("Image", filterName);
}
public bool Exists(string imageName)
{
Console.WriteLine("The image " + imageName + " found in filter " + mFilterName);
return true;
}
}
的使用看起来像
var serviceDefault = ContractResolver.Resolve<IImageRepositoryService>();
serviceDefault.Exists("myimage.bmp");
新的变化打破了旧用法。即
var serviceDefault = ContractResolver.Resolve<IImageRepositoryService>();
抛出异常 分辨率依赖性的失败,类型= “UnityTest.IImageRepositoryService”,名字= “(无)”。 发生异常时:解析时。 异常是:InvalidOperationException - 无法构造字符串类型。您必须配置容器以提供此值。
我想在新功能的同时不想打破旧功能。
var serviceDefault = ContractResolver.Resolve<IImageRepositoryService>();
serviceDefault.Exists("myimage.bmp");
应该显示
var parameterOverride1 = new ParameterOverride("filterName", "filter1");
var servicefilter1 = ContractResolver.Resolve<IImageRepositoryService>(new[] { parameterOverride1 });
servicefilter1.Exists("myimage.bmp");
应显示在控制台的消息“图像myimage.bmp在滤波器过滤器1中发现”,“在滤波器StandardImageFilter中发现的图像myimage.bmp”在控制台消息
var parameterOverride2 = new ParameterOverride("filterName", "filter2");
var servicefilter2 = ContractResolver.Resolve<IImageRepositoryService>(new[] { parameterOverride2 });
servicefilter2.Exists("myimage.bmp");
应该显示
0123“在过滤器过滤器2中发现的图像myimage.bmp”在控制台消息如何解决这个问题?