我是MEF的初学者。我写这段代码,但我不明白为什么程序显示这个结果。mef中意外的结果
namespace ConsoleApplication1
{
public class MEFTest
{
[Import]
public string Text { get; set; }
[Import]
public IExtension Ext { get; set; }
public void ShowText()
{
AssemblyCatalog asscatalog = new AssemblyCatalog(typeof(Extension2).Assembly);
CompositionContainer container = new CompositionContainer(asscatalog);
CompositionBatch batch = new CompositionBatch();
batch.AddPart(this);
container.Compose(batch);
Console.WriteLine(Text);
Console.WriteLine(Ext.Text);
}
}
class Program
{
static void Main(string[] args)
{
MEFTest mef = new MEFTest();
mef.ShowText();
Console.ReadKey();
}
}
public interface IExtension
{
string Text { get; set; }
}
[Export]
public class Extension1 : IExtension
{
[Export]
public string Text { get; set; }
public Extension1()
{
Text = "From Extension1.";
}
}
[Export(typeof(IExtension))]
public class Extension2 : IExtension
{
// [Export(typeof(IExtension).GetProperties()[0].GetType())]
public string Text { get; set; }
public Extension2()
{
Text = "From Extension2.";
}
}
}
结果:
从扩展1。 来自Extension2。
是你的结果形式Extenstion1。表单Extension2? – Jethro
Hazai,正如里德所述,你必须删除[Import] public string Text {get; set;}你不需要这个。 – Jethro