1

这是我的表单，它应该显示我导入的类的结果：

public partial class Form1 : Form
{
    [Import(typeof(ITests))]
    public ITests Template;

    public string texter;

    public Form1()
    {
        InitializeComponent();
        texter = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\bin\\dll";
        textBox1.Text = texter;
        string[] array = Directory.GetFiles(texter, "*.dll");

        foreach(string file in array)
        {
            textBox1.Text += Environment.NewLine + file;
        }
        Program();
    }

    public void Program()
    {
        AggregateCatalog catalog = new AggregateCatalog();
        catalog.Catalogs.Add(new DirectoryCatalog(texter));
        Console.WriteLine(catalog.Catalogs);
        try
        {
            CompositionContainer container = new CompositionContainer(catalog);
            container.ComposeParts(this);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

这是我的公共界面：我在两个项目中都导入了它们，所以我已经尝试避免组装引用错误

namespace ClassLibrary1
{
    public interface ITests
    {
        string Result(string result);
    }
}

这是我的带有导出代码的 dll：

namespace WindowsFormsApplication1
{
    public class Template 
    {
        //Please write all your tests in this class
        //[TestClass]
        public class Tests
        {
            //example of class
            //[TestMethod]
            public class Example : ITests
            {
                [Export(typeof(ITests))]
                public string Result(string res)
                {
                    string resa = res + " dit is door de test gegaan";
                    return resa;
                }
            }

            //[TestMethod]
            public class ExampleTest2
            {
            }
        }
    }
}

我收到此错误：

System.ComponentModel.Composition.dll 'WindowsFormsApplication1.vshost.exe'（托管（v4.0.30319））中发生了“System.ComponentModel.Composition.Primitives.ComposablePartException”类型的第一次机会异常：已加载

'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.DebuggerVisualizers\11.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.DebuggerVisualizers.dll' 合成产生了单一合成错误。下面提供了根本原因。查看 CompositionException.Errors 属性以获取更多详细信息。

1) 导出 'WindowsFormsApplication1.Template+Tests+Example.Result (ContractName="ClassLibrary1.ITests")' 不可分配给类型 'ClassLibrary1.ITests'。

导致：无法在“WindowsFormsApplication1.Form1”部分设置导入“WindowsFormsApplication1.Form1.Template (ContractName="ClassLibrary1.ITests")”。元素：WindowsFormsApplication1.Form1.Template (ContractName="ClassLibrary1.ITests") --> WindowsFormsApplication1.Form1

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1 回答 1

3

看起来你放[Export]错地方了。您正在尝试将Result字符串导出为 ITests 类型。相反，导出应该在您的班级级别：

[Export(typeof(ITests))]
public class Example : ITests
{
    public string Result(string res)
    {
        string resa = res + " dit is door de test gegaan";
        return resa;
    }
}
于 2013-02-28T16:36:08.540 回答