求教一个关于自定义控件的属性在VS2005的设计器中有时候报错的问题

it2022-05-06 12

各位大俠，最近小弟想開發一個分頁控件，該控件繼承了Repeater控件，我在類裏面定義了幾個分頁的屬性，當我把這個自定義控件拉到VS2005的某個頁面，並用設計器顯示，它有時候會報錯，即控件顯示不出來，在設計器中顯示，出現這種情況時，我把VS2005關閉，然後再開起來，它有變好了！我想請問一下，是什麼原因引起的呢？是我的VS2005的問題，還是我的代碼那裏沒有處理好呢？設計器出錯畫面：類代碼如下（代碼還沒有寫完）

using System;using System.Collections.Generic;using System.Text;using System.Web.UI;using System.Web.UI.WebControls;using System.ComponentModel;

namespace Toiletry.UI{ /// <summary> /// 繼承Repeater控件，添加分頁功能 /// </summary> [ToolboxData("<{0}:DataRepeater runat='server' RecordCount=\"100\"><HeaderTemplate><table><tr><td>Header1</td><td>Header2</td></tr></HeaderTemplate><ItemTemplate><tr><td>Data1</td><td>Data2</td></tr></ItemTemplate><FooterTemplate></table></FooterTemplate> </{0}:DataRepeater>")] public class DataRepeater : System.Web.UI.WebControls.Repeater { [Category("分頁")] [DefaultValue(0)] public int RecordCount { get { object o = ViewState["RecordCount"];

return o == null ? 0 : Convert.ToInt32(o); } set { ViewState["RecordCount"] = value; } }

[Category("分頁")] [DefaultValue(0)] public virtual int PageIndex { get { object o = ViewState["PageIndex"];

return o == null ? 0 : Convert.ToInt32(o); } set { ViewState["PageIndex"] = value; } }

[Category("分頁")] [DefaultValue(10)] public virtual int PageSize { get { object o = ViewState["PageSize"];

return o == null ? 10 : Convert.ToInt32(o); } set { ViewState["PageSize"] = value; } }

[Category("分頁")] [DefaultValue(true)] public bool EnablePaging { get { object o = ViewState["EnablePaging"];

return o == null ? true : Convert.ToBoolean(o); } set { ViewState["EnablePaging"] = value; } }

public override void RenderControl(HtmlTextWriter writer) { Table PageTable = new Table(); PageTable.RenderBeginTag(writer);

#region "Data Row"

TableRow DataRow = new TableRow(); DataRow.RenderBeginTag(writer);

//Data Cell TableCell DataCell = new TableCell(); DataCell.RenderBeginTag(writer);

//Repeater控件的內容 base.RenderControl(writer);

DataCell.RenderEndTag(writer);

DataRow.RenderEndTag(writer);

#endregion

//允許分頁時，才呈現分頁控件 if (EnablePaging == true) { #region "Page Row"

TableRow PageRow = new TableRow(); PageRow.RenderBeginTag(writer);

//Page Cell PageCell PCell = new PageCell(RecordCount, PageIndex, PageSize); PageRow.Cells.Add(PCell);

PageRow.RenderControl(writer);

PageRow.RenderEndTag(writer);

#endregion }

PageTable.RenderEndTag(writer); } }

public class PageCell : System.Web.UI.WebControls.TableCell { /// <summary> /// 總記錄數 /// </summary> private int _RecordCount;

/// <summary> /// 當前頁碼[索引從0開始，即0=第1頁] /// </summary> private int _PageIndex;

/// <summary> /// 每頁顯示的記錄筆數 /// </summary> private int _PageSize;

/// <summary> /// 總共有多少頁 /// </summary> private int _PageCount;

/// <summary> /// 在分頁控件上，顯示多少個[頁碼鏈接] /// </summary> private int _PageLinkCount = 8;

/// <summary> /// 構造函數 /// </summary> /// <param name="RecordCount">總記錄數</param> /// <param name="PageIndex">當前頁碼[索引從0開始，即0=第1頁]</param> /// <param name="PageSize">每頁顯示的記錄筆數</param> public PageCell(int RecordCount, int PageIndex, int PageSize) { _RecordCount = RecordCount; _PageIndex = PageIndex; _PageSize = PageSize;

//_PageSize=0的異常 if (_PageSize == 0) { _PageSize = 10; }

//求一共有幾頁 if (_RecordCount % _PageSize == 0) { _PageCount = _RecordCount / _PageSize; } else { _PageCount = _RecordCount / _PageSize + 1; }

//產生分頁控件 InitPageControl(); }

/// <summary> /// 產生分頁控件 /// </summary> public virtual void InitPageControl() { //當前是第幾頁 int CurrentPageIndex = _PageIndex + 1;

//頁碼排列的中間值 int MiddleValue = 0;

//頁碼排列中間左邊有幾個 int LeftCount = 0;

//頁碼排列中間右邊有幾個 int RightCount = 0;

if (_PageLinkCount % 2 == 0) { MiddleValue = _PageLinkCount / 2 + 1; LeftCount = _PageLinkCount / 2; RightCount = _PageLinkCount / 2 - 1; } else { MiddleValue = (_PageLinkCount - 1) / 2 + 1; LeftCount = (_PageLinkCount - 1) / 2; RightCount = (_PageLinkCount - 1) / 2; }

//當前頁碼<=中間值 if (CurrentPageIndex <= MiddleValue) { if (_PageCount >= _PageLinkCount) { for (int i = 1; i <= _PageLinkCount; i++) { LinkButton PageLink = new LinkButton(); PageLink.Text = i.ToString();