c# - 扩展 DataList 以接受来自 LinkBut​​tons 的新 InsertCommand

Question

我正在尝试继承 DataList 以接受来自嵌入式 LinkBut​​tons 的新命令。这是我的抽象类：

public abstract class BaseFieldGroup : DataList
{
    public const string InsertCommandName = "Insert";
    public event DataListCommandEventHandler InsertCommand
    {
        add
        {
            base.Events.AddHandler(EventInsertCommand, value);
        }
        remove
        {
            base.Events.RemoveHandler(EventInsertCommand, value);
        }
    }
    private static readonly object EventInsertCommand;
    static BaseFieldGroup()
    {
        EventInsertCommand = new object();
    }
    protected virtual void OnInsertCommand(DataListCommandEventArgs e)
    {
        DataListCommandEventHandler handler = (DataListCommandEventHandler)base.Events[EventInsertCommand];
        if (handler != null)
        {
            handler(this, e);
        }
    }
}

看起来是对的，但事件没有被捕获；我不确定为什么。但是，我也注意到 LinkBut​​ton 用 RaiseBubble 发送了偶数，我不知道这是否是一个问题。有人有想法吗？

哦，这是2.0

Answer 1

啊哈！找到并修复；我必须重写 DataList 的 OnBubbleEvent 以适应（调用）新命令。见下文：

public abstract class BaseFieldGroup : DataList
{
...
    protected override bool OnBubbleEvent(object source, EventArgs e)
    {
        bool flag = false;
        if (e is DataListCommandEventArgs)
        {
            DataListCommandEventArgs args = (DataListCommandEventArgs)e;
            this.OnItemCommand(args);
            flag = true;
            switch (args.CommandName)
            {
                case SelectCommandName:
                    this.SelectedIndex = args.Item.ItemIndex;
                    this.OnSelectedIndexChanged(EventArgs.Empty);
                    return flag;
                case EditCommandName:
                    this.OnEditCommand(args);
                    return flag;
                case DeleteCommandName:
                    this.OnDeleteCommand(args);
                    return flag;
                case UpdateCommandName:
                    this.OnUpdateCommand(args);
                    return flag;
                case CancelCommandName:
                    this.OnCancelCommand(args);
                    return flag; //??
                case InsertCommandName:
                    this.OnInsertCommand(args);
                    return flag;
            }
        }
        return flag;
    }