带MEF的Winforms [英] Winforms with MEF

问题描述

我有一个使用不同选项卡的winforms应用程序.我想使用MEF来添加更多在启动时导入的选项卡.我很难弄清楚该怎么做.

I have a winforms App that uses different tabs. I would like to use MEF to be able to add more tabs that are imported at startup. I am having a hard time figuring out how to go about doing this.

这就是我所做的.

我选择了主要的winforms类并将其缩减，以便其中只有一个TabControl，我通过一个接口向每个TabPage公开.然后，我还创建了第二个接口ITab，与MEF一起使用以获取标签页，然后将其添加到主tabcontrol中.要创建一个新的标签页，我只需添加一个新表单，然后向其中添加一个tabcontrol并设计标签页.我将ITab界面添加到新表单中，并添加以下方法将页面移至主表单.

I took the main winforms class and striped it down so that there is only a TabControl in it which I expose to each each TabPage through an interface. I then also create a second interface ITab which I use with MEF to get the tabpage and then add it to to the main tabcontrol. To create a new tab page I then just add a new form and then add a tabcontrol to it and design the tab pages. I add the ITab interface to the new form and add the following method which moves the pages to the main form.

public void MoveTabPages(IForm fm)
{
   while (this.tabControl1.Controls.Count > 0)
   {
      fm.tab.Controls.Add(this.tabControl1.Controls[0]);
   }
}

事件委托和所有这些好东西只要它们仅引用表单类中的内容，就可以工作.

Events delegates and all of that good stuff work as long as they only reference what is in their form class.

这是完整的代码.

//Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;

namespace Winforms_Mef
{
   public interface IForm
   {
      TabControl tab { get; }
   }

   public interface ITab
   {
      void MoveTabPages(IForm fm);
   }

   public partial class Form1 : Form,IForm
   {
      private CompositionContainer _container;

      [Import]
      public IEnumerable Tabs { get; set; }

      public TabControl tab
      {
         get { return tabControl1; }
      }

      public Form1()
      {
         Compose();
         InitializeComponent();

         foreach (ITab tab in Tabs)
         {
            tab.MoveTabPages(this);
         }

      }

      private void Compose()
      {
         var catalog =new AssemblyCatalog(typeof(ITab).Assembly);
         var batch = new CompositionBatch();
         batch.AddPart(this);

         _container =new CompositionContainer(catalog);
         _container.Compose(batch);
      }
   }
}


//Form2.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.ComponentModel.Composition;

namespace Winforms_Mef
{
   [Export(typeof(ITab))]
   public partial class Form2 : Form,ITab
   {
      public Form2()
      {
         InitializeComponent();
      }


      public void MoveTabPages(IForm fm)
      {
         while (this.tabControl1.Controls.Count > 0)
         {
            fm.tab.Controls.Add(this.tabControl1.Controls[0]);
         }
      }
   }
}

推荐答案

在继续之前，我认为需要清理您的Compose方法.为什么要将容器和目录添加到批处理中?

Before moving on I think your Compose method needs to be cleaned up. Why are you adding the container and catalog into the batch?

batch.AddExportedObject(_container);
batch.AddExportedObject(catalog);

AddExportedObject 用于将已有的对象实例添加为导出对象，尝试将容器和目录用作导出对象并没有多大意义

AddExportedObject is used to add a pre-existing object instance as an export and it doesn't make much sense trying to use the container and catalog as exports

privat void Compose()
{
    var catalog =
        new AssemblyCatalog(typeof(ITab).Assembly);

    var batch =
        new CompositionBatch();
    batch.AddPart(this);

    var container =
        new CompositionContainer(catalog);
    container.Compose(batch);
}

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