自定义的GridView控件源代码

　　简单地扩展GridView控件的功能。扩展的功能有：当前页/共几页，首页  上一页  下一页  末页  go[]ok
而且还能把gridview导入到excel中。

Code
  1namespace KFC
  2{
  3    using System;
  4    using System.ComponentModel;
  5    using System.Drawing.Design;
  6    using System.IO;
  7    using System.Runtime.InteropServices;
  8    using System.Web;
  9    using System.Web.UI;
 10    using System.Web.UI.HtmlControls;
 11    using System.Web.UI.WebControls;
 12
 13    public class myGridView : GridView
 14    {
 15        protected void btnExport_Click(object sender, ImageClickEventArgs e)
 16        {
 17            ImageButton button = (ImageButton)sender;
 18            GridView parent = (GridView)button.Parent.Parent.Parent.Parent;
 19            HttpResponse response = this.Context.ApplicationInstance.Response;
 20            if ((parent.Rows.Count + 1) < 0x10000)
 21            {
 22                parent.AllowPaging = false;
 23                parent.DataBind();
 24                StringWriter writer = new StringWriter();
 25                HtmlTextWriter writer2 = new HtmlTextWriter(writer);
 26                HtmlForm child = new HtmlForm();
 27                response.Charset = "gb2312";
 28                response.ContentEncoding = System.Text.Encoding.UTF8;
 29                response.ContentType = "application/vnd.ms-word";
 30                response.AddHeader("content-disposition", "attachment;filename=Report.doc");
 31               
 32             
 33                this.EnableViewState = false;
 34                this.Page.Controls.Add(child);
 35                child.Controls.Add(parent);
 36                this.ClearControls(parent);
 37                child.RenderControl(writer2);
 38                response.Write(writer.ToString());
 39                response.End();
 40                parent.AllowPaging = true;
 41                parent.DataBind();
 42            }
 43            else
 44            {
 45                response.Write("记录数量过大，无法导出到Excel。");
 46            }
 47        }
 48
 49        protected void Button1_Click(object sender, EventArgs e)
 50        {
 51            Button button = (Button)sender;
 52            myGridView parent = (myGridView)button.Parent.Parent.Parent.Parent;
 53            HttpResponse response = this.Context.ApplicationInstance.Response;
 54            response.Clear();
 55            response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
 56            response.Charset = "gb2312";
 57            response.ContentType = "application/vnd.xls";
 58            StringWriter writer = new StringWriter();
 59            HtmlTextWriter writer2 = new HtmlTextWriter(writer);
 60            parent.AllowPaging = false;
 61            parent.DataBind();
 62            parent.RenderControl(writer2);
 63            response.Write(writer.ToString());
 64            response.End();
 65            parent.AllowPaging = true;
 66            parent.DataBind();
 67        }
 68
 69        private void ClearControls(Control control)
 70        {
 71            for (int i = control.Controls.Count - 1; i >= 0; i--)
 72            {
 73                this.ClearControls(control.Controls[i]);
 74            }
 75            if ((control is ImageButton) || (control is Image))
 76            {
 77                control.Parent.Controls.Remove(control);
 78            }
 79            if (control is TableCell)
 80            {
 81                for (int j = 0; j < control.Controls.Count; j++)
 82                {
 83                    LiteralControl control2;
 84                    if ((control.Controls[j] is ImageButton) || (control.Controls[j] is Image))
 85                    {
 86                        control.Controls.Remove(control.Controls[j]);
 87                    }
 88                    if (control.Controls[j] is CheckBox)
 89                    {
 90                        CheckBox box = (CheckBox) control.Controls[j];
 91                        control2 = new LiteralControl();
 92                        control2.Text = box.Checked ? "true" : "false";
 93                        control.Controls.Add(control2);
 94                        control.Controls.Remove(box);
 95                    }
 96                    else if (!(control.Controls[j] is Label) && !(control.Controls[j] is LiteralControl))
 97                    {
 98                        Control control3 = control.Controls[j];
 99                        if (control3.GetType().GetProperty("SelectedItem") != null)
100                        {
101                            control2 = new LiteralControl();
102                            try
103                            {
104                                control2.Text = control3.GetType().GetProperty("SelectedItem").GetValue(control3, null).ToString();
105                            }
106                            catch (Exception)
107                            {
108                            }
109                            control.Controls.Add(control2);
110                            control.Controls.Remove(control3);
111                        }
112                        else if (control3.GetType().GetProperty("Text") != null)
113                        {
114                            control2 = new LiteralControl();
115                            control2.Text = control3.GetType().GetProperty("Text").GetValue(control3, null).ToString();
116                            control.Controls.Add(control2);
117                            control.Controls.Remove(control3);
118                        }
119                    }
120                }
121            }
122        }
123
124        private void CustomizePageBar(GridViewRowEventArgs e)
125        {        
126
127            Label label = new Label();
128            label.Text = (this.PageIndex + 1) + "/" + this.PageCount;
129            label.Font.Bold = true;
130
131            TableCell cell2 = new TableCell();
132            cell2.Width = Unit.Pixel(80);
133            cell2.Controls.Add(label);
134
135            /**//*
136            Label lbTotal = new Label();
137            lbTotal.Font.Bold = true;
138            int currentPageIndex = this.PageIndex;
139            this.PageIndex = this.PageCount - 1;
140
141            lbTotal.Text = "共"+(this.PageCount - 1) * this.PageSize + this.Rows.Count+"条记录";
142
143            this.PageIndex = currentPageIndex;
144
145            TableCell cellTotal = new TableCell();
146            cellTotal.Width = Unit.Pixel(120);
147            cellTotal.Controls.Add(lbTotal);
148             */
149             
150
151
152            LinkButton lbtnFirst = new LinkButton();
153            lbtnFirst.ID = "lbtnfirst";
154            lbtnFirst.Text = "首  页";
155            lbtnFirst.Font.Bold = true;
156            lbtnFirst.Font.Size = base.PagerStyle.Font.Size;
157            lbtnFirst.Click += new EventHandler(this.Pagination);
158            lbtnFirst.CommandArgument = "First";
159
160            TableCell cellFirst = new TableCell();
161            cellFirst.Width = Unit.Pixel(70);
162            cellFirst.Controls.Add(lbtnFirst);
163
164            LinkButton lbtnPrev = new LinkButton();
165            lbtnPrev.ID = "lbtnprev";
166            lbtnPrev.Text = "上一页";
167            lbtnPrev.Font.Bold = true;
168            lbtnPrev.Font.Size = base.PagerStyle.Font.Size;
169            lbtnPrev.Click+=new EventHandler(this.Pagination);
170            lbtnPrev.CommandArgument = "Prev";
171
172            TableCell cellPrev = new TableCell();
173            cellPrev.Width = Unit.Pixel(70);
174            cellPrev.Controls.Add(lbtnPrev);
175
176            LinkButton lbtnNext = new LinkButton();
177            lbtnNext.ID = "lbtnnext";
178            lbtnNext.Text = "下一页";
179            lbtnNext.Font.Bold = true;
180            lbtnNext.Font.Size = base.PagerStyle.Font.Size;
181            lbtnNext.Click+=new EventHandler(this.Pagination);
182            lbtnNext.CommandArgument = "Next";
183
184            TableCell cellNext = new TableCell();
185            cellNext.Width = Unit.Pixel(70);
186            cellNext.Controls.Add(lbtnNext);
187
188            LinkButton lbtnLast = new LinkButton();
189            lbtnLast.ID = "lbtnLast";
190            lbtnLast.Text = "末  页";
191            lbtnLast.Font.Bold = true;
192            lbtnLast.Font.Size = base.PagerStyle.Font.Size;
193            lbtnLast.Click+=new EventHandler(this.Pagination);
194            lbtnLast.CommandArgument = "Last";
195
196            TableCell cellLast = new TableCell();
197            cellLast.Width = Unit.Pixel(70);
198            cellLast.Controls.Add(lbtnLast);
199
200            //cellFirst.Controls.Add(lbtnFirst);
201            //cellFirst.Controls.Add(lbtnPrev);
202            //cellFirst.Controls.Add(lbtnNext);
203            //cellFirst.Controls.Add(lbtnLast);
204
205            
206
207            Label label2 = new Label();
208            label2.Text = "go: ";
209            label2.ID = "lblGoTo";
210            label2.Font.Bold = true;
211            label2.Font.Size = base.PagerStyle.Font.Size;
212
213            TableCell cell3 = new TableCell();
214            //cell3.Width = Unit.Pixel(0x10);
215
216            cell3.Controls.Add(label2);
217
218
219            DropDownList list = new DropDownList();
220            list.ID = "ddlPick";
221            list.AutoPostBack = true;
222            list.EnableViewState = true;
223            list.Font.Size = base.PagerStyle.Font.Size;
224
225            for (int i = 1; i <= this.PageCount; i++)
226            {
227                list.Items.Add(i.ToString());
228            }
229            list.SelectedIndex = this.PageIndex;
230            list.SelectedIndexChanged += new EventHandler(this.OnPagePicked);
231
232            TextBox txtPage = new TextBox();
233            txtPage.Text = "";
234            txtPage.Width = Unit.Pixel(20);
235            txtPage.EnableViewState = true;
236            txtPage.Font.Size = base.PagerStyle.Font.Size;
237
238
239            TableCell cell4 = new TableCell();
240            //cell4.Width = Unit.Pixel(0x10);
241            
242
243            Button btnOK = new Button();
244            btnOK.ID = "btnok";
245            btnOK.Text = "OK";
246            btnOK.Click+=new EventHandler(this.OnbtnOK_Click);
247
248            cell4.Controls.Add(txtPage);
249            cell4.Controls.Add(btnOK);
250
251
252            TableCell cell5 = new TableCell();
253            cell5.Width = Unit.Pixel(150);
254
255            foreach (Control control in e.Row.Cells[0].Controls)
256            {
257                cell5.Controls.Add(control);
258            }
259
260            Table child = new Table();//
261            child.BorderWidth = 0;
262            child.CellPadding = 0;
263            child.CellSpacing = 0;
264            child.Width = Unit.Percentage(100.0);
265            child.Height = Unit.Pixel(20);
266
267            child.Rows.Add(new TableRow());
268
269            child.Rows[0].Cells.Add(cell2);
270
271            //child.Rows[0].Cells.Add(cellTotal);
272            child.Rows[0].Cells.Add(cellFirst);
273            child.Rows[0].Cells.Add(cellPrev);
274            child.Rows[0].Cells.Add(cellNext);
275            child.Rows[0].Cells.Add(cellLast);
276            
277            child.Rows[0].Cells.Add(cell5);
278            child.Rows[0].Cells.Add(cell3);
279            child.Rows[0].Cells.Add(cell4);
280            e.Row.Cells[0].Controls.Add(child);
281        }
282
283        protected void DisplaySortOrderImages(string sortExpression, GridViewRow dgItem)
284        {
285            string[] sortColumns = sortExpression.Split(",".ToCharArray());
286            for (int i = 0; i < dgItem.Cells.Count; i++)
287            {
288                if ((dgItem.Cells[i].Controls.Count > 0) && (dgItem.Cells[i].Controls[0] is LinkButton))
289                {
290                    string str;
291                    int num2;
292                    string commandArgument = ((LinkButton)dgItem.Cells[i].Controls[0]).CommandArgument;
293                    this.SearchSortExpression(sortColumns, commandArgument, out str, out num2);
294                    if (num2 > 0)
295                    {
296                        string str3 = str.Equals("ASC") ? this.SortAscImageUrl : this.SortDescImageUrl;
297                        if (str3 != string.Empty)
298                        {
299                            Image child = new Image();
300                            child.ImageUrl = str3;
301                            dgItem.Cells[i].Controls.Add(child);
302                            Label label = new Label();
303                            label.Font.Size = FontUnit.Small;
304                            label.Text = num2.ToString();
305                            dgItem.Cells[i].Controls.Add(label);
306                        }
307                        else
308                        {
309                            Label label2 = new Label();
310                            label2.Font.Size = FontUnit.XSmall;
311                            label2.Font.Name = "webdings";
312                            label2.EnableTheming = false;
313                            label2.Text = str.Equals("ASC") ? "5" : "6";
314                            dgItem.Cells[i].Controls.Add(label2);
315                            if (this.AllowMultiColumnSorting)
316                            {
317                                Literal literal = new Literal();
318                                literal.Text = num2.ToString();
319                                dgItem.Cells[i].Controls.Add(literal);
320                            }
321                        }
322                    }
323                }
324            }
325        }
326
327        protected string GetSortExpression(GridViewSortEventArgs e)
328        {
329            string[] sortColumns = null;
330            string sortExpression = this.SortExpression;
331            if (sortExpression != string.Empty)
332            {
333                sortColumns = sortExpression.Split(",".ToCharArray());
334            }
335            if ((sortExpression.IndexOf(e.SortExpression) > 0) || sortExpression.StartsWith(e.SortExpression))
336            {
337                sortExpression = this.ModifySortExpression(sortColumns, e.SortExpression);
338            }
339            else
340            {
341                sortExpression = sortExpression + ("," + e.SortExpression + " ASC ");
342            }
343            return sortExpression.TrimStart(",".ToCharArray()).TrimEnd(",".ToCharArray());
344        }
345
346        protected void imgToggle_Click(object sender, ImageClickEventArgs e)
347        {
348            ImageButton button = (ImageButton)sender;
349            GridView parent = (GridView)button.Parent.Parent.Parent.Parent;
350            
351            parent.AllowPaging = !parent.AllowPaging;
352        }
353
354        protected string ModifySortExpression(string[] sortColumns, string sortExpression)
355        {
356            string str = sortExpression + " ASC ";
357            string str2 = sortExpression + " DESC ";
358            for (int i = 0; i < sortColumns.Length; i++)
359            {
360                if (str.Equals(sortColumns[i]))
361                {
362                    sortColumns[i] = str2;
363                }
364                else if (str2.Equals(sortColumns[i]))
365                {
366                    Array.Clear(sortColumns, i, 1);
367                }
368            }
369            return string.Join(",", sortColumns).Replace(",,", ",").TrimStart(",".ToCharArray());
370        }
371
372        protected void OnPagePicked(object sender, EventArgs e)
373        {
374            DropDownList list = (DropDownList)sender;
375            this.PageIndex = Convert.ToInt32(list.SelectedItem.Value) - 1;
376            GridViewPageEventArgs args = new GridViewPageEventArgs(Convert.ToInt32(list.SelectedItem.Value) - 1);
377            this.OnPageIndexChanging(args);
378        }
379
380        protected void OnbtnOK_Click(object sender, EventArgs e)
381        {
382            
383            //if (((Button)sender).Text.Trim() != "")
384            //{
385                
386            //    int intPageNo = Convert.ToInt32(((Button)sender).Text.Trim())-1;
387            //    if (intPageNo > 0 && intPageNo < this.PageCount)
388            //    {
389            //        this.PageIndex = intPageNo;
390            //        GridViewPageEventArgs args = new GridViewPageEventArgs(intPageNo);
391            //        this.OnPageIndexChanging(args);
392            //    }
393            //}
394        }
395
396        protected void Pagination(object sender, EventArgs e)
397        {
398            LinkButton lbtn = (LinkButton)sender;
399            string PageArgs = lbtn.CommandArgument;
400            switch (PageArgs)
401            {
402                case "First":
403                    this.PageIndex = 0;
404                    break;
405                case "Prev":
406                    if (this.PageIndex > 0)
407                    {
408                        this.PageIndex = this.PageIndex - 1;
409                    }
410                    break;
411                case "Next":
412                    if (this.PageIndex < this.PageCount - 1)
413                    {
414                        this.PageIndex = this.PageIndex + 1;
415                    }
416                    break;
417                case "Last":
418                    this.PageIndex = this.PageCount - 1;
419                    break;
420            }
421            GridViewPageEventArgs args = new GridViewPageEventArgs(this.PageIndex);
422            this.OnPageIndexChanging(args);
423
424            
425        }
426
427        protected override void OnRowCreated(GridViewRowEventArgs e)
428        {
429            GridViewRow row;
430            if (e.Row.RowType == DataControlRowType.Header)
431            {
432                if (this.AllowPagingToggle)
433                {
434                    ImageButton child = new ImageButton();
435                    child.AlternateText = "toggle";
436                    child.ImageUrl = "~/images/toggle.gif";
437                    child.Click += new ImageClickEventHandler(this.imgToggle_Click);
438                    Image image = new Image();
439                    image.ImageUrl = "~/images/spacer.gif";
440                    image.Width = 10;
441                    ImageButton button2 = new ImageButton();
442                    button2.AlternateText = "excel";
443                    button2.ImageUrl = "~/images/excel.gif";
444                    button2.Click += new ImageClickEventHandler(this.btnExport_Click);
445                    row = e.Row;
446                    row.Cells[0].Controls.Add(child);
447                    row.Cells[0].Controls.Add(image);
448                    row.Cells[0].Controls.Add(button2);
449                }
450                if (this.SortExpression != string.Empty)
451                {
452                    this.DisplaySortOrderImages(this.SortExpression, e.Row);
453                }
454            }
455            else if (e.Row.RowType == DataControlRowType.DataRow)
456            {
457                row = e.Row;
458                bool flag = (row.RowIndex % 2) == 0;
459                row.Attributes["onmouseover"] = "HandleOver( this );";
460                row.Attributes["onmouseout"] = "HandleOut( this );";
461            }
462            else if (e.Row.RowType == DataControlRowType.Pager)
463            {
464                this.CustomizePageBar(e);
465            }
466            base.OnRowCreated(e);
467        }
468
469        protected override void OnRowDataBound(GridViewRowEventArgs e)
470        {
471            if (e.Row.RowType == DataControlRowType.DataRow)
472            {
473                GridViewRow row = e.Row;
474                for (int i = 0; i < row.Cells.Count; i++)
475                {
476                    if (!string.IsNullOrEmpty(row.Cells[i].Text) && char.IsNumber(row.Cells[i].Text[0]))
477                    {
478                        row.Cells[i].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
479                    }
480                }
481            }
482            base.OnRowDataBound(e);
483        }
484
485        protected override void OnSorting(GridViewSortEventArgs e)
486        {
487            if (this.AllowMultiColumnSorting)
488            {
489                e.SortExpression = this.GetSortExpression(e);
490            }
491            base.OnSorting(e);
492        }
493
494        protected void SearchSortExpression(string[] sortColumns, string sortColumn, out string sortOrder, out int sortOrderNo)
495        {
496            sortOrder = "";
497            sortOrderNo = -1;
498            for (int i = 0; i < sortColumns.Length; i++)
499            {
500                if (sortColumns[i].StartsWith(sortColumn))
501                {
502                    sortOrderNo = i + 1;
503                    if (this.AllowMultiColumnSorting)
504                    {
505                        sortOrder = sortColumns[i].Substring(sortColumn.Length).Trim();
506                    }
507                    else
508                    {
509                        sortOrder = (this.SortDirection == SortDirection.Ascending) ? "ASC" : "DESC";
510                    }
511                }
512            }
513        }
514
515        [ DefaultValue("false"),Description("Whether Sorting On more than one column is enabled"), Category("Behavior")]
516        public bool AllowMultiColumnSorting
517        {
518            get
519            {
520                object obj2 = this.ViewState["EnableMultiColumnSorting"];
521                return ((obj2 != null) ? ((bool)obj2) : false);
522            }
523            set
524            {
525                this.AllowSorting = true;
526                this.ViewState["EnableMultiColumnSorting"] = value;
527            }
528        }
529
530        [DefaultValue("true"), Description("Whether Paging Toggle is enabled"), Category("Behavior")]
531        public bool AllowPagingToggle
532        {
533            get
534            {
535                object obj2 = this.ViewState["AllowPagingToggle"];
536                return ((obj2 != null) ? ((bool)obj2) : false);
537            }
538            set
539            {
540                this.ViewState["AllowPagingToggle"] = value;
541            }
542        }
543
544        [DefaultValue(""), Editor("System.Web.UI.Design.UrlEditor", typeof(UITypeEditor)), Description("Image to display for Ascending Sort"), Category("Misc")]
545        public string SortAscImageUrl
546        {
547            get
548            {
549                object obj2 = this.ViewState["SortImageAsc"];
550                return ((obj2 != null) ? obj2.ToString() : "");
551            }
552            set
553            {
554                this.ViewState["SortImageAsc"] = value;
555            }
556        }
557
558        [DefaultValue(""), Editor("System.Web.UI.Design.UrlEditor", typeof(UITypeEditor)), Description("Image to display for Descending Sort"), Category("Misc")]
559        public string SortDescImageUrl
560        {
561            get
562            {
563                object obj2 = this.ViewState["SortImageDesc"];
564                return ((obj2 != null) ? obj2.ToString() : "");
565            }
566            set
567            {
568                this.ViewState["SortImageDesc"] = value;
569            }
570        }
571    }
572}

转载于:https://www.cnblogs.com/shajianheng/archive/2008/12/24/1361190.html