C#.Net组件开发(高级篇) - 自定义CollectionEditor编辑器-开发框架文库

C#.Net组件开发(高级篇) - 自定义CollectionEditor编辑器

自定义CollectionEditor编辑器

下图是DataGridViewColumnCollectionEditor，用于编辑DataGridView的Columns。

贴图图片

DataGridView.Columns属性定义：

// 摘要:

// Gets a collection that contains all the columns in the control.

// 返回结果:

// The System.Windows.Forms.DataGridViewColumnCollection that contains all the

// columns in the System.Windows.Forms.DataGridView control.

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]

[Editor("System.Windows.Forms.Design.DataGridViewColumnCollectionEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]

[MergableProperty(false)]

public DataGridViewColumnCollection Columns { get; }

由此可见，Columns 属性是由DataGridViewColumnCollectionEditor 设计器进行设计的。

在VS内不能查看DataGridViewColumnCollectionEditor 的元数据一探究竟，非常遗憾！从网上找到资料，该编辑窗体是公用的，只需要继承CollectionEditor基类就能实现自己的设计器。

另外，DataGridViewColumnCollection 继承BaseCollection基类，并实现IList接口。

// 摘要:

// Represents a collection of System.Windows.Forms.DataGridViewColumn objects

// in a System.Windows.Forms.DataGridView control.

[ListBindable(false)]

public class DataGridViewColumnCollection : BaseCollection, IList, ICollection, IEnumerable

{
}

自定义CollectionEditor编辑器

C# Code:

/// <summary>
/// 自定义CollectionEditor编辑器
/// </summary>
public class MyCollectionEditor : CollectionEditor
{
   public MyCollectionEditor(Type type)
   : base(type)
   { }

   /// <summary>
   /// 限制一次选一个实例
   /// </summary>
   /// <returns></returns>
   protected override bool CanSelectMultipleInstances()
   {
      return false;
   }

   /// <summary>
   /// 指定创建的对象类型
   /// </summary>
   /// <returns></returns>
   protected override Type CreateCollectionItemType()
   {
      return typeof(CSFrameworkNode);
   }

   protected override object CreateInstance(Type itemType)
   {
      //创建一个实例
      CSFrameworkNode o = (CSFrameworkNode)itemType.Assembly.CreateInstance(itemType.FullName);

      IDesignerHost host = (IDesignerHost)this.GetService(typeof(IDesignerHost));
      host.Container.Add(o);//重要！自动生成组件的设计时代码！

      //或者：
      //this.Context.Container.Add(o);//重要！自动生成组件的设计时代码！

      return o;
   }

   protected override void DestroyInstance(object instance)
   {
      base.DestroyInstance(instance);//重要！自动删除组件的设计时代码！
   }

}

//来源:C/S框架网(www.csframework.com) QQ:1980854898

自定义MyNodeCollection对象集合

C# Code:

/// <summary>
/// 自定义BaseCollection对象集合，实现IList接口
/// 如Object Collection Editor窗体的Add/Delete钮不可用是因为没有实现IList接口
/// </summary>
public class MyNodeCollection : BaseCollection, IList
{
   private ArrayList _innerList;

   public MyNodeCollection()
   {
      _innerList = new ArrayList();
   }

   protected override ArrayList List
   {
      get
      {
         return (ArrayList)_innerList;
      }
   }

   #region IList Members

   public int Add(object value)
   {
      return this.List.Add(value);
   }

   public void Clear()
   {
      this.List.Clear();
   }

   public bool Contains(object value)
   {
      return this.List.Contains(value);
   }

   public int IndexOf(object value)
   {
      return this.List.IndexOf(value);
   }

   public void Insert(int index, object value)
   {
      this.List.Insert(index, value);
   }

   public bool IsFixedSize
   {
      get { return this.List.IsFixedSize; }
   }

   public void Remove(object value)
   {
      this.List.Remove(value);
   }

   public void RemoveAt(int index)
   {
      this.List.RemoveAt(index);
   }

   public object this[int index]
   {
      get
      {
         return List[index];
      }
      set
      {
         List[index] = value;
      }
   }

   #endregion
}

//来源:C/S框架网(www.csframework.com) QQ:1980854898

定义一个MyNodeCollection类型的属性，并定义属性的编辑器

C# Code:

/// <summary>
/// 用于测试打开Collection Editor的编辑器窗体
/// </summary>
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
[Editor(typeof(MyCollectionEditor), typeof(UITypeEditor))]//属性编辑器
public MyNodeCollection MyNodeCollection
{
   get
   {
      return _MyNodeCollection;
   }
   set
   {
      _MyNodeCollection = value;
   }
}

//来源:C/S框架网(www.csframework.com) QQ:1980854898

VS设计器体验：

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