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POMEF. How to load a winform into winform container?
 

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  1. POMEF. How to load a winform into winform container?
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    <p>I have decided to play a little bit with MEF2 and net3.5 and I have thought it would be easy but I am stuck now. Generally the idea of my toy is I want to have form containet where I am going to load form extensions and show them. I did this code</p> <p>My extension:</p> <pre> <code> using System.ComponentModel.Composition; using System.Windows.Forms; namespace MyExtantion { public interface IForm { void LoadForm(Form form); } [Export(typeof(IForm))] public partial class MyExtantion : Form, IForm { public MyExtantion() { InitializeComponent(); } public void LoadForm(Form form) { MdiParent = form; Show(); } } } </code> </pre> <p>and form container </p> <pre> <code> using System; using System.Collections.Generic; using System.ComponentModel.Composition; using System.ComponentModel.Composition.Hosting; using System.Reflection; using System.Windows.Forms; namespace FormsContainer { public partial class FormContainer : Form { public FormContainer() { InitializeComponent(); } private CompositionContainer _container; public interface IForm { void LoadForm(Form form); } [Import(typeof(IForm))] public IEnumerable Forms { get; set; } private bool Compose() { var catalog = new AggregateCatalog( new AssemblyCatalog(Assembly.GetExecutingAssembly()), new DirectoryCatalog("Extantions")); var batch = new CompositionBatch(); batch.AddPart(this); _container = new CompositionContainer(catalog); try { _container.Compose(batch); } catch (CompositionException compositionException) { MessageBox.Show(compositionException.ToString()); return false; } return true; } private void FormContainer_Load(object sender, EventArgs e) { if (Compose()) foreach (IForm form in Forms) { form.LoadForm(this); } } } } </code> </pre> <p>The problem is I can not load my extantion and I have this error</p> <blockquote> <p>{"The composition remains unchanged. The changes were rejected because of the following error(s): The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.\r\n\r\n1) No exports were found that match the constraint '((exportDefinition.ContractName = \"FormsContainer.FormContainer+IForm\") &amp;&amp; (exportDefinition.Metadata.ContainsKey(\"ExportTypeIdentity\") &amp;&amp; \"FormsContainer.FormContainer+IForm\".Equals(exportDefinition.Metadata.get_Item(\"ExportTypeIdentity\"))))'.\r\n\r\nResulting in: Cannot set import 'FormsContainer.FormContainer.Forms (ContractName=\"FormsContainer.FormContainer+IForm\")' on part 'FormsContainer.FormContainer'.\r\nElement: FormsContainer.FormContainer.Forms (ContractName=\"FormsContainer.FormContainer+IForm\") --> FormsContainer.FormContainer\r\n"}</p> </blockquote> <p>How I can achieve it with MEF? and What I do wrong?</p>
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    1. USCœur
    1. USGalkin
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      1. POMEF. How to load a winform into winform container?
      1. USDrin Chan
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    1. COTry to use ImportMany(typeof(IForm)) instead of Import(typeof(IForm))
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      1. POMEF. How to load a winform into winform container?
      1. USIslam Yahiatene
    2. COThanks for the advice. Now I do not have the error which I mentioned, but I do not have any imported data which is anothere trouble.
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      1. USGalkin
    3. COCan you step through and after the creation of the container, can you use a watch to look into the container to see if there are any parts listed?
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      1. POMEF. How to load a winform into winform container?
      1. USMatthew Abbott
 

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