C# MEF 设置属性/属性注入
有没有什么方法可以使用 Microsoft Extensibility Framework(MEF) 让它工作
假设我有一个接口
public interface IApplicationSettings
{
string SettingOne { get; }
}
类，它实现了这个接口
[Export(typeof(IApplicationSettings))]
public class ApplicationSettings : IApplicationSettings
{
public string SettingOne
{
get
{
return "AAA";
}
}
}
类，其中包含我的接口作为属性
public class IoCConstructorMef
{
[Import("ApplicationSettings", typeof(IApplicationSettings))]
public IApplicationSettings ApplicationSettings { get; set; }
}
，那么我期望我的属性将被注入这里：
static void Main(string[] args)
{
IoCConstructorMef cm = new IoCConstructorMef();
//cm.ApplicationSettings - is null
}
看起来没有在这种情况下会发生注入。
我错过了什么或者做错了什么吗？
Is there any way to get it work using Microsoft Extensibility Framework(MEF)
Lets say i have interface
public interface IApplicationSettings
{
string SettingOne { get; }
}
Class which implementing this interface
[Export(typeof(IApplicationSettings))]
public class ApplicationSettings : IApplicationSettings
{
public string SettingOne
{
get
{
return "AAA";
}
}
}
Class which containg my interface as a property
public class IoCConstructorMef
{
[Import("ApplicationSettings", typeof(IApplicationSettings))]
public IApplicationSettings ApplicationSettings { get; set; }
}
then i am expecting that my property going to be injected here:
static void Main(string[] args)
{
IoCConstructorMef cm = new IoCConstructorMef();
//cm.ApplicationSettings - is null
}
Looks like there no injection happens in this case.
Am i missed something or did something wrong?
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评论（2）
您必须让
CompositionContainer为您创建一个对象才能满足其导入。将ExportAttribute添加到IoCConstructorMef，创建容器，然后调用container.GetExportedValue() 。You have to let the
CompositionContainercreate an object for you for its imports to be satisfied. Add anExportAttributetoIoCConstructorMef, create a container, and callcontainer.GetExportedValue<IoCConstructorMef>().你必须让 MEF 构建你的 IoCConstructorMef cm。否则导入将不会发生。
you have to let MEF construct your IoCConstructorMef cm. otherwise the import will not happen.