Asp.net 2.0 自定义控件开发[开发一个图表(WebChart)控件(柱状图示例)](示例代码下载)
(一). 概述
本文主要演示一个比较简单的 WebChart 柱状实现, 可以一方面了解一个较完整的控件开发实例,
里面用到了复合样式及视图存储等内容.另一方面了解一下WebChart的实现原理. 在Web开发中, 最终
是用浏览器呈现各种图表, 图表控件呈现过程是 根据控件提供的属性接口接收到数据参数, 用最基本的
Html元素<Table><tr><td>来呈现图表.
注: 本文参考 [Asp.net 2.0高级编程] 方案, 由于本书中配套代码说明链接打不开, 所以在文章最后面可以
下载我上传的自己做得比较完整的示例代码.
(二). 运行效果
1. 在浏览器中运行的柱状图
2. 主要属性 ( 可以通过修改这些属性参数修改其 外观样式和文本显示格式等信息)
_第1张图片](http://img.e-com-net.com/image/product/736af972efc14170bbba8d7c51a725e2.jpg)
主要属性用法介绍:
|
SimpleGaugeBar
控件重要属性介绍
|
|
|
FormatString
|
设置显示的文本格式, 如: “68 of 100”
|
|
Maximum
|
全值大小, 如上图中设置了 100.
|
|
Segments
|
每段值, 如上图中设置了 10. 这样根据Maximum的值控件就能够算出共有 100/10=10段(全值共有10个td呈现)
|
|
TextStyle
|
显示文本样式复合属性
|
|
Value
|
设置有效值, 如上图中设置了 68.
|
|
ForeColor
|
柱装有效值长度标志颜色(根据Value值决定其长度)
|
|
BackColor
|
柱装全值标志颜色
|
|
BorderColor
|
柱状边框颜色
|
(三). 代码
代码比较简单, 就两个文件; 主要代码, 都包含了中文注释. 在这里对代码不作多介绍.
1. 主控件文件 SimpleGaugeBar.cs 代码
1
namespace
KingControls
2 {
3 /// <summary>
4 /// Author:[ChengKing(ZhengJian)]
5 /// Blog:Http://blog.csdn.net/ChengKing
6 /// 本代码参照Asp.net2.0高级编程方案
7 /// </summary>
8 [DefaultProperty( " Value " )]
9 [ToolboxData( " <{0}:SimpleGaugeBarrunat=server></{0}:SimpleGaugeBar> " )]
10 [PersistChildrenAttribute( false )]
11 public class SimpleGaugeBar:CompositeControl
12 {
13 // 在绘制输出画面时，标志是哪个TD为分界点(从这个分界点改变表格的颜色绘制)
14 private int _intDividerCell;
15
16 private TextItemStyle_textStyle;
17
18 public SimpleGaugeBar()
19 {
20 }
21
22 #region 属性
23 /// <summary>
24 /// 进度条值
25 /// </summary>
26 public float Value
27 {
28 get
29 {
30 object o = ViewState[ " Value " ];
31 if (o == null )
32 return 0 ;
33 return float .Parse(o.ToString());
34 }
35 set
36 {
37 this .ViewState[ " Value " ] = value;
38 if (value > Maximum)
39 {
40 this .ViewState[ " Value " ] = Maximum;
41 }
42 }
43 }
44
45 /// <summary>
46 /// 全值
47 /// </summary>
48 public float Maximum
49 {
50 get
51 {
52 object o = this .ViewState[ " Maximum " ];
53 if (o == null )
54 {
55 return 100 ;
56 }
57 return float .Parse(o.ToString());
58 }
59 set
60 {
61 this .ViewState[ " Maximum " ] = value;
62 }
63 }
64
65 /// <summary>
66 /// 表示进度条分几段
67 /// </summary>
68 public int Segments
69 {
70 get
71 {
72 object o = this .ViewState[ " Segments " ];
73 if (o == null )
74 {
75 return 4 ;
76 }
77 return int .Parse(o.ToString());
78 }
79 set
80 {
81 this .ViewState[ " Segments " ] = value;
82 if (value < 1 )
83 {
84 this .ViewState[ " Segments " ] = 1 ;
85 }
86 }
87 }
88
89 /// <summary>
90 /// 文本呈现格式
91 /// </summary>
92 public string FormatString
93 {
94 get
95 {
96 object o = this .ViewState[ " FormatString " ];
97 if (o == null )
98 {
99 return " <b>{0}</b>/<b>{1}</b> " ;
100 }
101 return ( string )o;
102 }
103 set
104 {
105 this .ViewState[ " FormatString " ] = value;
106 }
107 }
108
109 public bool GridLines
110 {
111 get
112 {
113 object o = this .ViewState[ " GridLines " ];
114 if (o == null )
115 {
116 return true ;
117 }
118 return ( bool )o;
119 }
120 set
121 {
122 this .ViewState[ " GridLines " ] = value;
123 }
124 }
125
126 [PersistenceMode(PersistenceMode.EncodedInnerDefaultProperty)]
127 [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
128 [NotifyParentProperty( true )]
129 public TextItemStyleTextStyle
130 {
131 get
132 {
133 if (_textStyle == null )
134 {
135 _textStyle = new TextItemStyle();
136 }
137 if (IsTrackingViewState)
138 {
139 ((IStateManager)_textStyle).TrackViewState();
140 }
141 return _textStyle;
142 }
143 }
144
145 #endregion
146
147 #region 方法
148
149 protected override void Render(HtmlTextWriterwriter)
150 {
151 PrepareControlForRendering();
152 base .Render(writer);
153
154 // base.RenderContents(writer);
155 // this.RenderContents(writer);
156 // this.Render(writer);
157
158 }
159
160 protected override void CreateChildControls()
161 {
162 // base.CreateChildControls();
163 this .Controls.Clear();
164 CreateControlHierarchy();
165 ClearChildViewState();
166 }
167
168 /// <summary>
169 /// 在Web开发中，用Table/TR/TD来表示图形输出
170 /// </summary>
171 protected virtual void CreateControlHierarchy()
172 {
173 // 最外层表格
174 Tableouter = new Table();
175 TableRowouterRow = new TableRow();
176 outer.Rows.Add(outerRow);
177
178 TableCellrulerCell = new TableCell();
179 outerRow.Cells.Add(rulerCell);
180 BuildGaugeBar(rulerCell);
181
182 // 根据条件增加文本显示单元格
183 TableCelltextCell = new TableCell();
184 if ( ! TextStyle.DisplayTextAtBottom)
185 {
186 outerRow.Cells.Add(textCell);
187 BuildLabel(textCell);
188 }
189
190 this .Controls.Add(outer);
191
192 if ( ! TextStyle.RenderInsideTable && TextStyle.DisplayTextAtBottom)
193 {
194 BuildLabel( null );
195 }
196 }
197
198 /// <summary>
199 /// 用Label来呈现文本,如:{8/10}
200 /// </summary>
201 /// <paramname="tc"></param>
202 void BuildLabel(TableCelltc)
203 {
204 float buf = GetValueToRepresent();
205 string msg = GetTextToRepresent();
206
207 Labellbl = new Label();
208 if (tc is TableCell)
209 {
210 tc.Controls.Add(lbl);
211 }
212 else
213 {
214 this .Controls.Add(lbl);
215 }
216 lbl.Text = String.Format(msg,buf,Maximum);
217 }
218
219 void BuildGaugeBar(TableCelltc)
220 {
221 Tablet = new Table();
222 TableRowtr = new TableRow();
223 t.Rows.Add(tr);
224
225 BuildRuler(tr);
226
227 if (TextStyle.RenderInsideTable)
228 {
229 BuildLabelIntoTable(t);
230 }
231 tc.Controls.Add(t);
232 }
233
234 void BuildRuler(TableRowruler)
235 {
236 float val = GetValueToRepresent();
237 float valueToRepresent = 100f * val / Maximum;
238 int numOfSegments = GetNumOfSegments();
239 int segmentWidth = 100 / numOfSegments;
240 bool finished = false ;
241 for ( int i = 1 ;i <= numOfSegments;i ++ )
242 {
243 if (valueToRepresent < i * segmentWidth)
244 {
245 if (finished)
246 {
247 TableCellstillToDo = new TableCell();
248 ruler.Cells.Add(stillToDo);
249 stillToDo.Width = Unit.Percentage(segmentWidth);
250 }
251 else
252 {
253 _intDividerCell = i - 1 ;
254 TableCellcell = new TableCell();
255 ruler.Cells.Add(cell);
256 cell.Width = Unit.Percentage(segmentWidth);
257 cell.Height = Unit.Percentage( 100 );
258
259 // 增加子表
260 Tablechild = new Table();
261 child.Width = Unit.Percentage( 100 );
262 child.Height = Unit.Percentage( 100 );
263 cell.Controls.Add(child);
264 child.CellPadding = 0 ;
265 child.CellSpacing = 0 ;
266 TableRowchildRow = new TableRow();
267 child.Rows.Add(childRow);
268
269 float fx = ( 100 * (valueToRepresent - segmentWidth * (i - 1 )) / segmentWidth);
270 if (valueToRepresent > (i - 1 ) * segmentWidth)
271 {
272 TableCellleft = new TableCell();
273 childRow.Cells.Add(left);
274 left.Width = Unit.Percentage(fx);
275 }
276 TableCellright = new TableCell();
277 childRow.Cells.Add(right);
278 right.Width = Unit.Percentage( 100 - fx);
279 finished = true ;
280 }
281 }
282 else
283 {
284 TableCelldone = new TableCell();
285 ruler.Cells.Add(done);
286 done.Width = Unit.Percentage(segmentWidth);
287 }
288 }
289 }
290
291 /// <summary>
292 /// 创建最外Table的第二行,显示文本
293 /// </summary>
294 /// <paramname="t"></param>
295 void BuildLabelIntoTable(Tablet)
296 {
297 float buf = GetValueToRepresent();
298 int numOfSegments = GetNumOfSegments();
299 string msg = GetTextToRepresent();
300 if (TextStyle.DisplayTextAtBottom)
301 {
302 TableRowlabel = new TableRow();
303 t.Rows.Add(label);
304 TableCelllblCell = new TableCell();
305 label.Cells.Add(lblCell);
306
307 lblCell.ColumnSpan = numOfSegments;
308 lblCell.Text = String.Format(msg,buf,Maximum);
309 }
310 }
311
312 private string GetTextToRepresent()
313 {
314 return this .FormatString;
315 }
316
317 private int GetNumOfSegments()
318 {
319 return this .Segments;
320 }
321
322 private float GetValueToRepresent()
323 {
324 return this .Value;
325 }
326
327 /// <summary><spa
2 {
3 /// <summary>
4 /// Author:[ChengKing(ZhengJian)]
5 /// Blog:Http://blog.csdn.net/ChengKing
6 /// 本代码参照Asp.net2.0高级编程方案
7 /// </summary>
8 [DefaultProperty( " Value " )]
9 [ToolboxData( " <{0}:SimpleGaugeBarrunat=server></{0}:SimpleGaugeBar> " )]
10 [PersistChildrenAttribute( false )]
11 public class SimpleGaugeBar:CompositeControl
12 {
13 // 在绘制输出画面时，标志是哪个TD为分界点(从这个分界点改变表格的颜色绘制)
14 private int _intDividerCell;
15
16 private TextItemStyle_textStyle;
17
18 public SimpleGaugeBar()
19 {
20 }
21
22 #region 属性
23 /// <summary>
24 /// 进度条值
25 /// </summary>
26 public float Value
27 {
28 get
29 {
30 object o = ViewState[ " Value " ];
31 if (o == null )
32 return 0 ;
33 return float .Parse(o.ToString());
34 }
35 set
36 {
37 this .ViewState[ " Value " ] = value;
38 if (value > Maximum)
39 {
40 this .ViewState[ " Value " ] = Maximum;
41 }
42 }
43 }
44
45 /// <summary>
46 /// 全值
47 /// </summary>
48 public float Maximum
49 {
50 get
51 {
52 object o = this .ViewState[ " Maximum " ];
53 if (o == null )
54 {
55 return 100 ;
56 }
57 return float .Parse(o.ToString());
58 }
59 set
60 {
61 this .ViewState[ " Maximum " ] = value;
62 }
63 }
64
65 /// <summary>
66 /// 表示进度条分几段
67 /// </summary>
68 public int Segments
69 {
70 get
71 {
72 object o = this .ViewState[ " Segments " ];
73 if (o == null )
74 {
75 return 4 ;
76 }
77 return int .Parse(o.ToString());
78 }
79 set
80 {
81 this .ViewState[ " Segments " ] = value;
82 if (value < 1 )
83 {
84 this .ViewState[ " Segments " ] = 1 ;
85 }
86 }
87 }
88
89 /// <summary>
90 /// 文本呈现格式
91 /// </summary>
92 public string FormatString
93 {
94 get
95 {
96 object o = this .ViewState[ " FormatString " ];
97 if (o == null )
98 {
99 return " <b>{0}</b>/<b>{1}</b> " ;
100 }
101 return ( string )o;
102 }
103 set
104 {
105 this .ViewState[ " FormatString " ] = value;
106 }
107 }
108
109 public bool GridLines
110 {
111 get
112 {
113 object o = this .ViewState[ " GridLines " ];
114 if (o == null )
115 {
116 return true ;
117 }
118 return ( bool )o;
119 }
120 set
121 {
122 this .ViewState[ " GridLines " ] = value;
123 }
124 }
125
126 [PersistenceMode(PersistenceMode.EncodedInnerDefaultProperty)]
127 [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
128 [NotifyParentProperty( true )]
129 public TextItemStyleTextStyle
130 {
131 get
132 {
133 if (_textStyle == null )
134 {
135 _textStyle = new TextItemStyle();
136 }
137 if (IsTrackingViewState)
138 {
139 ((IStateManager)_textStyle).TrackViewState();
140 }
141 return _textStyle;
142 }
143 }
144
145 #endregion
146
147 #region 方法
148
149 protected override void Render(HtmlTextWriterwriter)
150 {
151 PrepareControlForRendering();
152 base .Render(writer);
153
154 // base.RenderContents(writer);
155 // this.RenderContents(writer);
156 // this.Render(writer);
157
158 }
159
160 protected override void CreateChildControls()
161 {
162 // base.CreateChildControls();
163 this .Controls.Clear();
164 CreateControlHierarchy();
165 ClearChildViewState();
166 }
167
168 /// <summary>
169 /// 在Web开发中，用Table/TR/TD来表示图形输出
170 /// </summary>
171 protected virtual void CreateControlHierarchy()
172 {
173 // 最外层表格
174 Tableouter = new Table();
175 TableRowouterRow = new TableRow();
176 outer.Rows.Add(outerRow);
177
178 TableCellrulerCell = new TableCell();
179 outerRow.Cells.Add(rulerCell);
180 BuildGaugeBar(rulerCell);
181
182 // 根据条件增加文本显示单元格
183 TableCelltextCell = new TableCell();
184 if ( ! TextStyle.DisplayTextAtBottom)
185 {
186 outerRow.Cells.Add(textCell);
187 BuildLabel(textCell);
188 }
189
190 this .Controls.Add(outer);
191
192 if ( ! TextStyle.RenderInsideTable && TextStyle.DisplayTextAtBottom)
193 {
194 BuildLabel( null );
195 }
196 }
197
198 /// <summary>
199 /// 用Label来呈现文本,如:{8/10}
200 /// </summary>
201 /// <paramname="tc"></param>
202 void BuildLabel(TableCelltc)
203 {
204 float buf = GetValueToRepresent();
205 string msg = GetTextToRepresent();
206
207 Labellbl = new Label();
208 if (tc is TableCell)
209 {
210 tc.Controls.Add(lbl);
211 }
212 else
213 {
214 this .Controls.Add(lbl);
215 }
216 lbl.Text = String.Format(msg,buf,Maximum);
217 }
218
219 void BuildGaugeBar(TableCelltc)
220 {
221 Tablet = new Table();
222 TableRowtr = new TableRow();
223 t.Rows.Add(tr);
224
225 BuildRuler(tr);
226
227 if (TextStyle.RenderInsideTable)
228 {
229 BuildLabelIntoTable(t);
230 }
231 tc.Controls.Add(t);
232 }
233
234 void BuildRuler(TableRowruler)
235 {
236 float val = GetValueToRepresent();
237 float valueToRepresent = 100f * val / Maximum;
238 int numOfSegments = GetNumOfSegments();
239 int segmentWidth = 100 / numOfSegments;
240 bool finished = false ;
241 for ( int i = 1 ;i <= numOfSegments;i ++ )
242 {
243 if (valueToRepresent < i * segmentWidth)
244 {
245 if (finished)
246 {
247 TableCellstillToDo = new TableCell();
248 ruler.Cells.Add(stillToDo);
249 stillToDo.Width = Unit.Percentage(segmentWidth);
250 }
251 else
252 {
253 _intDividerCell = i - 1 ;
254 TableCellcell = new TableCell();
255 ruler.Cells.Add(cell);
256 cell.Width = Unit.Percentage(segmentWidth);
257 cell.Height = Unit.Percentage( 100 );
258
259 // 增加子表
260 Tablechild = new Table();
261 child.Width = Unit.Percentage( 100 );
262 child.Height = Unit.Percentage( 100 );
263 cell.Controls.Add(child);
264 child.CellPadding = 0 ;
265 child.CellSpacing = 0 ;
266 TableRowchildRow = new TableRow();
267 child.Rows.Add(childRow);
268
269 float fx = ( 100 * (valueToRepresent - segmentWidth * (i - 1 )) / segmentWidth);
270 if (valueToRepresent > (i - 1 ) * segmentWidth)
271 {
272 TableCellleft = new TableCell();
273 childRow.Cells.Add(left);
274 left.Width = Unit.Percentage(fx);
275 }
276 TableCellright = new TableCell();
277 childRow.Cells.Add(right);
278 right.Width = Unit.Percentage( 100 - fx);
279 finished = true ;
280 }
281 }
282 else
283 {
284 TableCelldone = new TableCell();
285 ruler.Cells.Add(done);
286 done.Width = Unit.Percentage(segmentWidth);
287 }
288 }
289 }
290
291 /// <summary>
292 /// 创建最外Table的第二行,显示文本
293 /// </summary>
294 /// <paramname="t"></param>
295 void BuildLabelIntoTable(Tablet)
296 {
297 float buf = GetValueToRepresent();
298 int numOfSegments = GetNumOfSegments();
299 string msg = GetTextToRepresent();
300 if (TextStyle.DisplayTextAtBottom)
301 {
302 TableRowlabel = new TableRow();
303 t.Rows.Add(label);
304 TableCelllblCell = new TableCell();
305 label.Cells.Add(lblCell);
306
307 lblCell.ColumnSpan = numOfSegments;
308 lblCell.Text = String.Format(msg,buf,Maximum);
309 }
310 }
311
312 private string GetTextToRepresent()
313 {
314 return this .FormatString;
315 }
316
317 private int GetNumOfSegments()
318 {
319 return this .Segments;
320 }
321
322 private float GetValueToRepresent()
323 {
324 return this .Value;
325 }
326
327 /// <summary><spa
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