一段很牛的代码，高手看看懂不懂，指导一下
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Drawing;
[assembly:TagPrefix("PowerDataGrid","grid")]
namespace DataGrid20051130
{
/// <summary>
/// Summary description for WebCustomControl1.
/// </summary>
//[DefaultProperty("Text"),
//ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
[ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
public class WebCustomControl1 : System.Web.UI.WebControls.DataGrid
{
// private string text;
//
// [Bindable(true),
// Category("Appearance"),
// DefaultValue("")]
// public string Text
// {
// get
// {
// return text;
// }
//
// set
// {
// text = value;
// }
// }
/// <summary>
/// Render this control to the output parameter specified.
/// </summary>
/// <param name="output"> The HTML writer to write out to </param>
protected override void Render(HtmlTextWriter output)
{
//output.Write(Text);
bool designMode = ((Site != null) && (Site.DesignMode));
//Backing up the properties need to change during the render process
string tempLeft = Style["LEFT"];
string tempTop = Style["TOP"];
Unit tempHeight = Height;
string tempTableStyle = Style["TABLE-LAYOUT"];
//Render a "<div>" container with scrollbars.
output.WriteBeginTag("div");
output.WriteAttribute("id",ID + "_div");
output.WriteAttribute("style","HEIGHT: " + Height + ";" +
"WIDTH: " + (Width.Value + 20) + "px;" +
"TOP: " + Style["TOP"] + ";" +
"LEFT: " + Style["LEFT"] + ";" +
"POSITION: " + Style["POSITION"] + ";" +
"OVERFLOW-X: auto;" +
"Z-INDEX: " + Style["Z-INDEX"] + ";" +
//Render the scrollbar differently for design-time and runtime.
"OVERFLOW-Y: " + (designMode?"scroll":"auto")
);
output.Write(HtmlTextWriter.TagRightChar);
//The DataGrid is inside the "<div>" element, so place it at (0,0).
Style["LEFT"] = "0px";
Style["TOP"] = "0px";
//Render the DataGrid.
base.Render(output);
output.WriteEndTag("div");
//Restore the values
Style["LEFT"] = tempLeft;
Style["TOP"] = tempTop;
//The following rendering is only necessary under runtime. It has negative impact during design time.
if (!designMode)
{
//Render another copy of the DataGrid with only headers.
//Render it after the DataGrid with contents,
//so that it is on the top. Z-INDEX is more complex here.
//Set Height to 0, so that it will adjust on its own.
Height = new Unit("0px");
//从这里开始，看不懂了，请大虾执教
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
//This style is important for matching column widths later.
Style["TABLE-LAYOUT"] = "fixed";
// base.Render(htw);
base.Render(htw);
StringBuilder sbRenderedTable = sw.GetStringBuilder();
htw.Close();
sw.Close();
Debug.Assert((sbRenderedTable.Length > 0),"Rendered HTML string is empty. Check viewstate usage and databinding.");
string temp = sbRenderedTable.ToString();
if (sbRenderedTable.Length > 0)
{
if ((AllowPaging) && ((PagerPosition.Top == PagerStyle.Position || (PagerPosition.TopAndBottom == PagerStyle.Position))))
{
Trace.WriteLine(temp);
sbRenderedTable.Replace(ID,ID + "_Pager", 0, (temp.IndexOf(ID) + ID.Length));
temp = sbRenderedTable.ToString();
string pager = temp.Substring(0, temp.ToLower().IndexOf(@"</tr>") + 5);
Trace.WriteLine(pager);
output.Write(pager);
output.WriteEndTag("table");
//Start of pager's <tr>
int start = temp.ToLower().IndexOf(@"<tr");
//End of pager's </tr>
int end = temp.ToLower().IndexOf(@"</tr>") + 5;
//Remove the <tr> for pager from the string. Prepare to render the headers.
sbRenderedTable.Remove(start,end-start);
Trace.WriteLine(sbRenderedTable.ToString());
sbRenderedTable.Replace(ID + "_Pager",ID + "_Headers", 0, (temp.IndexOf(ID+"_Pager") + (ID+"_Pager").Length));
问题点数：50、回复次数：24Top
1 楼rawliu（rawliu）回复于 2005-11-30 17:02:55 得分 0
temp = sbRenderedTable.ToString();
string tableHeaders = temp.Substring(0, (temp.ToLower()).IndexOf(@"</tr>") + 5);
Trace.WriteLine(tableHeaders);
output.Write(tableHeaders);
output.WriteEndTag("table");
string headerID = ID + "_Headers";
string pagerID = ID + "_Pager";
string divID = ID + "_div";
string adjustWidthScript = @"<script language=javascript>
//debugger;
var headerTableRow = " + headerID + @".rows[0];
var originalTableRow = " + ID + @".rows[1];"+ @"
headerTableRow.height = originalTableRow.offsetHeight;
" +
//Adjust pager row's height, width.
pagerID + @".rows[0].height = " + ID + @".rows[0].offsetHeight;" +pagerID + @".style.width = " + ID + @".offsetWidth;
for (var i = 0; i < headerTableRow.cells.length; i++)
{
headerTableRow.cells[i].width = originalTableRow.cells[i].offsetWidth;
}
" +
//Also needs to adjust the width of the "<div>" at client side in addition to servier side,
//since the Table's actual width can go beyond the width specified at server side under Edit mode.
//The server side width manipulation is mainly for design-time appearance.
divID + @".style.width = " + ID + @".offsetWidth + 20 + 'px'; " +
//The following script is for flow-layout. We cannot get the position of the control
//on server side if the the page is with flow-layout.
headerID + @".style.left = " + divID + @".offsetLeft;
" +
headerID + @".style.top = " + divID + @".offsetTop + " + pagerID + @".offsetHeight; " + headerID + @".style.position = 'absolute';" +pagerID + @".style.left = " + divID + @".offsetLeft; " +pagerID + @".style.top = " + divID + @".offsetTop; " +pagerID + @".style.position = 'absolute'; </script>";
Page.RegisterStartupScript("dummyKey" + this.ID, adjustWidthScript);
//output.Write(adjustWidthScript);
}
else
{
//Replace the table's ID with a new ID.
//It is tricky that we must only replace the 1st occurence,
//since the rest occurences can be used for postback scripts for sorting.
sbRenderedTable.Replace(ID,ID + "_Headers", 0, (temp.IndexOf(ID) + ID.Length));
Trace.WriteLine(sbRenderedTable.ToString());
//We only need the headers, stripping the rest contents.
temp = sbRenderedTable.ToString();
string tableHeaders = temp.Substring(0, (temp.ToLower()).IndexOf(@"</tr>") + 5);
Trace.WriteLine(tableHeaders);
output.Write(tableHeaders);
output.WriteEndTag("table");
//Client side script for matching column widths.
//Can't find a way to do this on the server side, since the browser can change widths on the client side.
string adjustWidthScript = @"
<script language=javascript>
//debugger;
var headerTableRow = " + this.ID + @"_Headers.rows[0];
var originalTableRow = " + this.ID + @".rows[0];
headerTableRow.height = originalTableRow.offsetHeight;
for (var i = 0; i < headerTableRow.cells.length; i++) {
headerTableRow.cells[i].width = originalTableRow.cells[i].offsetWidth;
}
" +
//Also needs to adjust the width of the "<div>" at client side in addition to servier side,
//since the Table's actual width can go beyond the width specified at server side under Edit mode.
//The server side width manipulation is mainly for design-time appearance.
this.ID + "_div" + @".style.width = " + this.ID + @".offsetWidth + 20 + 'px';
" +
//The following script is for flow-layout. We cannot get the position of the control
//on server side if the the page is with flow-layout.
this.ID + "_Headers" + @".style.left = " + this.ID + @"_div.offsetLeft;
" +this.ID + "_Headers" + @".style.top = " + this.ID + @"_div.offsetTop; " + this.ID + "_Headers" + @".style.position = 'absolute'; </script>";
Page.RegisterStartupScript("dummyKey" + this.ID, adjustWidthScript);
//output.Write(adjustWidthScript);
}
Height = tempHeight;
Style["TABLE-LAYOUT"] = tempTableStyle;
}
}
}
protected override void OnInit(EventArgs e)
{
if (0 == Width.Value) Width = new Unit("400px");
if (0 == Height.Value) Height = new Unit("200px");
//Transparent header is not allowed.
if (HeaderStyle.BackColor.IsEmpty)
{
HeaderStyle.BackColor = Color.White;
}
//Transparent pager is not allowed.
if (PagerStyle.BackColor.IsEmpty)
{
PagerStyle.BackColor = Color.White;
}
base.OnInit (e);
}
[Browsable(false)]
public override bool ShowHeader
{
get
{
return true;
}
set
{
if (false == value)
throw new InvalidOperationException("Use the original DataGrid to set ShowHeaders to false.");
}
}
}
}
我得MSN是 logo_liu@hotmail.com
欢迎共同学习
Top
2 楼ediex（心剑）回复于 2005-11-30 17:36:43 得分 0
顶Top
3 楼likun_vc（www.netin4.com）回复于 2005-11-30 17:40:44 得分 0
我先顶！再慢看Top
4 楼shoutor（www.mouxiao.com）回复于 2005-11-30 17:45:44 得分 0
这是一个名成PowerDataGrid的grid控件Top
5 楼shoutor（www.mouxiao.com）回复于 2005-11-30 17:46:16 得分 0
编译后注册到工具箱就可以使用Top
6 楼baby97（小雕（Asp→.Net中...）回复于 2005-11-30 17:49:08 得分 0
顶一下。慢慢看。Top
7 楼xczgb（TJJTDS）回复于 2005-11-30 17:57:29 得分 0
收藏下来。。。望高手来解答。顶Top
8 楼rawliu（rawliu）回复于 2005-11-30 17:57:35 得分 0
不是啊，他有一个错误，就是在运行时sbRenderedTable为空，导致数据显示不出来。
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9 楼clxxj（查无此人）回复于 2005-11-30 20:21:00 得分 0
用这个,已在实际项目中应用.
http://devuser.cnblogs.com/archive/2005/10/26/262663.htmlTop
10 楼szh3210（／+／=〆）回复于 2005-11-30 20:37:40 得分 0
慢慢看Top
11 楼sp1234（asp.net不是一个语言，是一个操作系统）回复于 2005-11-30 21:00:12 得分 0
这种代码把简单的事做得复杂，懒得看。Top
12 楼dzgwt2004（dzgwt2004）回复于 2005-11-30 21:50:56 得分 0
我是初学者，在建立项目的时候只有WebUserControl1，我怎么找不到WebCustomControl1 啊？这个项目是怎么建立的啊？请教中……Top
13 楼tomtown530（梦想一定会实现！）回复于 2005-11-30 22:34:05 得分 0
这么强？！mark一下Top
14 楼xiedan79（Sam Xie）回复于 2005-12-01 08:55:20 得分 0
自定义的 DataGridTop
15 楼liushui1981（）回复于 2005-12-01 09:13:31 得分 0
好长！晕！！！Top
16 楼aarondai（冷侠）回复于 2005-12-01 09:18:07 得分 0
强人阿，想到了以前的自己，哈
现在都不想看了。。。。。。。。。。。。。Top
17 楼qwerttyy（今天也要快乐！)(每天回十帖）回复于 2005-12-01 09:26:22 得分 0
太长了.看晕Top
18 楼HJ_34（刺桐游子）回复于 2005-12-01 09:41:53 得分 0
...Top
19 楼killsound（小不懂）回复于 2005-12-01 09:56:30 得分 0
没注释!!浪费时间Top
20 楼yooono（Ｄi调）回复于 2005-12-01 12:52:04 得分 0
我看晕了，你赔！Top
21 楼triffang（冲凉不除3）回复于 2005-12-01 12:58:18 得分 0
这控件扩展的太夸张！
不好用，性能也不咋地！Top
22 楼BeRush（艾威）回复于 2005-12-01 15:20:14 得分 0
这种代码把简单的事做得复杂，懒得看。
Top
23 楼rawliu（rawliu）回复于 2005-12-05 22:00:34 得分 0
呵呵，我作出来了，有点问题，就是水平滚动条出不来，郁闷
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24 楼losingrose（）回复于 2005-12-05 22:11:59 得分 0
ComponentArt_WebUI系列控件不错,还有破解的可以下,怎一个爽字了得
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