动态网格视图-项模板控件事件处理

我创建了一个自定义的gridview控件，它继承了asp.net gridview。我需要在此网格视图中使用项目模板。我在自定义网格视图中创建了一个方法来生成项目模板。

public void addTemplateField(Control headerTemplateControl, Control itemTemplateControl, EventHandler bindHandler, EventHandler initHandler, string headerText, string sortExpression, bool isVisible, int? heightPx, int? widthPercent)
{
    TemplateField tField = new TemplateField();
    if (headerTemplateControl != null)
        tField.HeaderTemplate = new GridViewTemplate(ListItemType.Header, headerTemplateControl);
    if (bindHandler != null && initHandler != null)
        tField.ItemTemplate = new GridViewTemplate(ListItemType.Item, itemTemplateControl, bindHandler, initHandler);
    else if (bindHandler != null)
        tField.ItemTemplate = new GridViewTemplate(ListItemType.Item, itemTemplateControl, bindHandler, false);
    else if (initHandler != null)
        tField.ItemTemplate = new GridViewTemplate(ListItemType.Item, itemTemplateControl, initHandler, true);
    else
        tField.ItemTemplate = new GridViewTemplate(ListItemType.Item, itemTemplateControl);
    if (sortExpression != null)
        tField.SortExpression = sortExpression;
    tField.Visible = isVisible;
    if (headerText != null)
        tField.HeaderText = headerText;
    if (heightPx.HasValue)
        tField.HeaderStyle.Height = new Unit(heightPx.Value, UnitType.Pixel);
    if (widthPercent.HasValue)
        tField.HeaderStyle.Height = new Unit(widthPercent.Value, UnitType.Percentage);
    addColumnField(tField);
}

这就是我实现ITemplate 的方式

public class GridViewTemplate : ITemplate
{
    int _controlCount = 0;
    ListItemType _templateType;
    EventHandler _bindHandler;
    EventHandler _initHandler;
    Control _control;
    public GridViewTemplate(ListItemType type, Control control)
    {
        this._templateType = type;
        this._control = control;
    }
    public GridViewTemplate(ListItemType type, Control control, EventHandler Handler, bool isInitHandler)
    {
        this._templateType = type;
        this._control = control;
        if (isInitHandler)
            this._initHandler = Handler;
        else
            this._bindHandler = Handler;
    }
    public GridViewTemplate(ListItemType type, Control control, EventHandler bindHandler, EventHandler initHandler)
    {
        this._templateType = type;
        this._control = control;
        this._bindHandler = bindHandler;
        this._initHandler = initHandler;
    }
    public Control Copy(Control ctrlSource)
    {
        Type _type = ctrlSource.GetType();
        Control ctrlDest = (Control)Activator.CreateInstance(_type);
        foreach (PropertyInfo prop in _type.GetProperties())
        {
            if (prop.CanWrite)
            {
                if (prop.Name == "ID")
                {
                    ctrlDest.ID = ctrlSource.ID + "_copy_" + _controlCount;
                }
                else
                {
                    prop.SetValue(ctrlDest, prop.GetValue(ctrlSource, null), null);
                }
            }
        }
        _controlCount++;
        return ctrlDest;
    }
    public void InstantiateIn(Control container)
    {
        switch (_templateType)
        {
            case ListItemType.Header:
                container.Controls.Add(_control);
                break;
            case ListItemType.Item:
                Control temp = Copy(_control);
                if(_bindHandler != null)
                    temp.DataBinding += _bindHandler;
                if (_initHandler != null)
                    temp.Init += _initHandler;
                container.Controls.Add(temp);
                break;
        }
    }
}

在需要Default.aspx的页面中，我在PreInit上创建了这个网格视图，并将其事件处理程序附加到Init上。

我通过调用addTemplateField（）将复选框添加到网格中。

cbl = new CheckBox();
cbl.AutoPostBack = true;
init = new EventHandler(cbl_Init);
grd.addTemplateField(null, cbl, null, init, "SERVER", null, true, 20, 20);
void cbl_Init(object sender, EventArgs e)
{
    CheckBox c = (CheckBox)sender;
    c.CheckedChanged +=new EventHandler(cbl_CheckedChanged);
}
void cbl_CheckedChanged(object sender, EventArgs e)
{
  // Modify datasource
  // databind();

//如果我删除这个数据绑定，那么每次都会处理checkchanged。如果我保留数据绑定，则事件只会交替处理。}

问题是复选框checkchanged事件会交替触发。每隔一段时间，页面就会返回，但不处理checkchanged事件。我找不到原因，更不用说解决办法了。！？！？！