求救!!! 自定义控件的问题

lo_back___ 2010-08-17 10:23:07
小弟在自学自定义控件,于是尝试做一个GridView的分页控件.在实习过程中遇到了以下问题,GridView的绑定,自定义控件的事件都没有问题,而且自定义控件能够获取到GridView的当前页索引,但是GridView的翻页总是无效.冥思苦想了很多天 还是没有结果,觉得可能是因为自己还没有理解到控件的生命周期和数据回发机制.麻烦各位耽搁一点宝贵的时间来帮我看看这个的原因是什么.小弟不胜感激!
以下是我的自定义控件的全部代码 WebControl.cs


using System;

using System.Data;

using System.Collections.Generic;

using System.ComponentModel;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Collections.Specialized;



namespace CreateWebControl

{

    //定义一个事件类,用于记录一组LinkButton中被点击的LinkButton是哪一个.

    public class EventLinkButtonArgs : EventArgs

    {

        private int _ClickedIndex;



        public EventLinkButtonArgs()

        {



        }



        public int ClickedIndex

        {

            get

            {

                return this._ClickedIndex;

            }

            set

            {

                this._ClickedIndex = value;

            }

        }

    }



    //定义一个委托,用于处理数字链接.

    public delegate void LnkBtnListEventHandler(object sender, EventLinkButtonArgs e);

    public event LnkBtnListEventHandler RegisterLnkBtnListClick;

    public class Pager : CompositeControl

    {

        private Label _lblCurrentPage;

        private Label _lblAllPage;

        private TextBox _txtToPage;

        private Button _btnToPage;

        private Button _btnNext;

        private Button _btnPrev;

        private LinkButton _lnkToPage;



        private GridView _GvdControl;

        private DataTable _DtControl;



        private int _NumPage;

        private int _PageLnkTo;

        private int _Cellspacing;

        private int _Cellpadding;



        #region 分页控件所需的属性



        [Category("Layout")]

        [Description("呈现的样式")]

        public PagerLayout PgLayout

        {

            get

            {

                return this._PgLayout;

            }

            set

            {

                this._PgLayout = value;

            }

        }



        [Category("Data")]

        [Description("绑定使用控件分页的GridView")]

        public GridView ObjectGridView

        {

            get

            {

                return _GvdControl;

            }

            set

            {

                _GvdControl = value;

            }

        }



        [Category("Data")]

        [Description("GridView的数据源DataTable")]

        public DataTable DtControl

        {

            get

            {

                return _DtControl;

            }

            set

            {

                _DtControl = value;

            }

        }



        [DefaultValue(3)]

        [Category("Appearance")]

        [Description("显示链接的页码数")]

        public int NumPage

        {

            get

            {

                return this._NumPage;

            }

            set

            {

                this._NumPage = value;

            }

        }



        #endregion



        public Pager()

        {

            this._NumPage = 3;

            this._PgLayout = PagerLayout.Horizontal;

            this._PageNowIndex = 0;

            this._AutoPostBack = false;



            if (this.ObjectGridView == null)

            {

                this._GvdControl = new GridView();

            }

            if (this.DtControl == null)

            {

                this._DtControl = new DataTable();

            }

        }



        protected override void CreateChildControls()

        {

            this.Controls.Clear();



            _txtToPage = new TextBox();

            _txtToPage.ID = "txtToPage";

            _txtToPage.Width = Unit.Pixel(Convert.ToInt32(this.Width.Value * 0.1));

            _txtToPage.Height = this.Height;

            this.Controls.Add(this._txtToPage);



            _btnToPage = new Button();

            _btnToPage.ID = "btnToPage";

            _btnToPage.Text = "转到";

            _btnToPage.Width = Unit.Pixel(Convert.ToInt32(this.Width.Value * 0.1));

            _btnToPage.Height = this.Height;

            this._btnToPage.Click += new EventHandler(btnToPage_Click);

            this.Controls.Add(this._btnToPage);



            _btnNext = new Button();

            _btnNext.ID = "btnNext";

            _btnNext.Text = "下一页";

            _btnNext.Width = Unit.Pixel(Convert.ToInt32(this.Width.Value * 0.1));

            _btnNext.Height = this.Height;

            this._btnNext.Click += new EventHandler(btnNext_Click);

            this.Controls.Add(this._btnNext);



            _btnPrev = new Button();

            _btnPrev.ID = "btnPrev";

            _btnPrev.Text = "上一页";

            _btnPrev.Width = Unit.Pixel(Convert.ToInt32(this.Width.Value * 0.1));

            _btnPrev.Height = this.Height;

            this._btnPrev.Click += new EventHandler(btnPrev_Click);

            this.Controls.Add(this._btnPrev);



            for (int i = 1; i <= this._NumPage; i++)

            {

                _lnkToPage = new LinkButton();

                _lnkToPage.ID = "lnkBtn" + i.ToString();

                _lnkToPage.Text = i.ToString();

                _lnkToPage.Height = this.Height;

                _lnkToPage.Click += new EventHandler(lnkToPage_Click);



                this.Controls.Add(this._lnkToPage);

            }



            _lblCurrentPage = new Label();

            _lblCurrentPage.ID = "lblCurrentPage";

            _lblCurrentPage.Text = "当前页:" + this.ObjectGridView.PageIndex.ToString();

            _lblCurrentPage.Width = Unit.Pixel(Convert.ToInt32(this.Width.Value * 0.15));

            _lblCurrentPage.Height = this.Height;

            this.Controls.Add(this._lblCurrentPage);



            _lblAllPage = new Label();

            _lblAllPage.ID = "lblAllPage";

            _lblAllPage.Text = "总页数:" + this.ObjectGridView.PageCount.ToString();

            _lblAllPage.Width = Unit.Pixel(Convert.ToInt32(this.Width.Value * 0.15));

            _lblAllPage.Height = this.Height;

            this.Controls.Add(this._lblAllPage);



            this.ChildControlsCreated = true;

        }



        protected void FnBindGridView()

        {

            this.ObjectGridView.DataSource = this.DtControl;

            this.ObjectGridView.DataBind();

        }



        protected void lnkToPage_Click(object sender, EventArgs e)

        {

            EventLinkButtonArgs ex = new EventLinkButtonArgs();



            LinkButton lnkBtn = new LinkButton();

            lnkBtn = sender as LinkButton ?? new LinkButton();

            ex.ClickedIndex = Convert.ToInt32(lnkBtn.Text);



            this.lnkToPage_RegisterLnkBtnClick(sender, ex);

        }



        protected void lnkToPage_RegisterLnkBtnClick(object sender, EventLinkButtonArgs e)

        {

            if (this.RegisterLnkBtnListClick != null)

            {

                this.RegisterLnkBtnListClick(this, e);

            }

            else

            {

                this.ObjectGridView.PageIndex = e.ClickedIndex;

            }

            FnBindGridView();

        }



        protected void btnPrev_Click(object sender, EventArgs e)

        {

            if (this.ObjectGridView.PageIndex > 0 && this.ObjectGridView.PageIndex <= this.ObjectGridView.PageCount)

            {

                this.ObjectGridView.PageIndex--;

            }

            else

            {



            }

            FnBindGridView();

        }



        protected void btnNext_Click(object sender, EventArgs e)

        {

            if (this.ObjectGridView.PageIndex >= 0 && this.ObjectGridView.PageIndex <= this.ObjectGridView.PageCount)

            {

                this.ObjectGridView.PageIndex++;

            }

            else

            {



            }

            FnBindGridView();

        }



        protected void btnToPage_Click(object sender, EventArgs e) 

        {

            if (Convert.ToInt32(this._txtToPage.Text.ToString()) <= this.ObjectGridView.PageCount && Convert.ToInt32(this._txtToPage.Text.ToString()) >= 0)

            {

                this.ObjectGridView.PageIndex = Convert.ToInt32(this._txtToPage.Text.ToString());

            }

            else

            {



            }

            FnBindGridView();

        }



        protected override void Render(HtmlTextWriter writer)

        {

            writer.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "0");

            writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");

            writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");

            writer.RenderBeginTag(HtmlTextWriterTag.Table);



            writer.RenderBeginTag(HtmlTextWriterTag.Tr);

            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            this._lblAllPage.RenderControl(writer);

            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            this._lblCurrentPage.RenderControl(writer);

            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            this._btnPrev.RenderControl(writer);

            writer.RenderEndTag();

            for (int i = 1; i <= this._NumPage; i++)

            {

                writer.RenderBeginTag(HtmlTextWriterTag.Td);

                this.Controls[i + 3].RenderControl(writer);

                writer.RenderEndTag();

            }

            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            this._btnNext.RenderControl(writer);

            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            this._txtToPage.RenderControl(writer);

            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            this._btnToPage.RenderControl(writer);

            writer.RenderEndTag();

            writer.RenderEndTag();



            writer.RenderEndTag();

        }

    }

}



}
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charlie_zhuo 2010-08-18
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帮顶~
lo_back___ 2010-08-18
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没人愿意帮忙么?
sunnj87 2010-08-17
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从来不用gridview的绑定。可以设断点，一步步跟。
huangmin3956 2010-08-17
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好长 防沉
lo_back___ 2010-08-17
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4楼能说具体一点吗?
wuyq11 2010-08-17
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看看aspnetpager分页控件
viewstate保存分页页码
空气 2010-08-17
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好长。。。
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