一个简单的文本框控件
这一个简单的文本框控件主要实现在了IPostBackDataHandler, IEditableTextControl, ItextControl三个接口。IPostBackDataHandler
IEditableTextControl主要有事件event EventHandler TextChanged;
有ItextControl主要有一个Text属性
接口说明：
IPostBackDataHandler 主要有bool LoadPostData(string postDataKey, NameValueCollection postCollection);void RaisePostDataChangedEvent();二个方法。
用法：用于有数据回传时。在本例子中通过
1
PostBackOptions options1 = new PostBackOptions(this, string.Empty);
2 if (this.Page.Form != null)
3
{
4
options1.AutoPostBack = true;
5 text4 = Util.MergeScript(text4, page1.ClientScript.GetPostBackEventReference(options1, true));
6 writer.AddAttribute(HtmlTextWriterAttribute.Onchange, text4);
7 writer.AddAttribute("language", "javascript", false);
8
}
PostBackOptions options1 = new PostBackOptions(this, string.Empty);2
if (this.Page.Form != null)3
{
4
options1.AutoPostBack = true;5
text4 = Util.MergeScript(text4, page1.ClientScript.GetPostBackEventReference(options1, true));6
writer.AddAttribute(HtmlTextWriterAttribute.Onchange, text4);7
writer.AddAttribute("language", "javascript", false);8
}
从而实现在InventTextBox的AutoPostBack属性为True时回传数据。从而调用bool LoadPostData(string postDataKey, NameValueCollection postCollection)
在上方法返回为真时再调用void RaisePostDataChangedEvent();
2、IEditableTextControl有事件event EventHandler TextChanged;
3、ItextControl有一个Text属性
具本例子如下：
1using System;
2using System.Collections.Generic;
3using System.Text;
4using System.Web;
5using System.Drawing.Design;
6using System.Globalization;
7using System.Web.UI;
8using System.Web.UI.WebControls;
9using System.Security.Permissions;
10using System.Collections.Specialized;
11using System.ComponentModel;
12[assembly: TagPrefix("Invent.Controls", "Invent")]
13namespace InventControls
14{
15 [ToolboxData("<{0}:InventTextBox runat=server></{0}:InventTextBox>")]
16 public class InventTextBox : WebControl, IPostBackDataHandler, IEditableTextControl, ITextControl
17
{
18 public event EventHandler TextChanged
19 {
20 add
21 {
22 base.Events.AddHandler(InventTextBox.EventTextChanged, value);
23
}
24 remove
25 {
26 base.Events.RemoveHandler(InventTextBox.EventTextChanged, value);
27 }
28 }
29
30 static InventTextBox()
31 {
32 InventTextBox.EventTextChanged = new object();
33 }
34
35 public InventTextBox() : base(HtmlTextWriterTag.Input)
36 {
37 }
38 protected override void AddAttributesToRender(HtmlTextWriter writer)
39 {
40 Page page1 = this.Page;
41 if (page1 != null)
42 {
43 page1.VerifyRenderingInServerForm(this);
44 }
45 string text1 = this.UniqueID;
46 if (text1 != null)
47 {
48 writer.AddAttribute(HtmlTextWriterAttribute.Name, text1);
49 }
50 string text3 = this.Text;
51 if (text3.Length > 0)
52 {
53 writer.AddAttribute(HtmlTextWriterAttribute.Value, text3);
54 }
55 if (this.ReadOnly)
56 {
57 writer.AddAttribute(HtmlTextWriterAttribute.ReadOnly, "readonly");
58 }
59
60 if (this.AutoPostBack && this.Page != null)
61 {
62 string text4 = null;
63 if (base.HasAttributes)
64 {
65 text4 = base.Attributes["onchange"];
66 if (text4 != null)
67 {
68 text4 = Util.EnsureEndWithSemiColon(text4);
69 base.Attributes.Remove("onchange");
70 }
71 }
72 PostBackOptions options1 = new PostBackOptions(this, string.Empty);
73 if (this.Page.Form != null)
74 {
75 options1.AutoPostBack = true;
76 text4 = Util.MergeScript(text4, page1.ClientScript.GetPostBackEventReference(options1, true));
77 writer.AddAttribute(HtmlTextWriterAttribute.Onchange, text4);
78 writer.AddAttribute("language", "javascript", false);
79 }
80 }
81 else if (page1 != null)
82 {
83 page1.ClientScript.RegisterForEventValidation(this.UniqueID, string.Empty);
84 }
85 if (this.Enabled && !base.IsEnabled)
86 {
87 writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
88 }
89 base.AddAttributesToRender(writer);
90 }
91 protected override void OnPreRender(EventArgs e)
92 {
93 base.OnPreRender(e);
94 }
95 protected override void Render(HtmlTextWriter writer)
96 {
97 this.RenderBeginTag(writer);
98 if (this.TextMode == TextBoxMode.MultiLine)
99 {
100 HttpUtility.HtmlEncode(this.Text, writer);
101 }
102 this.RenderEndTag(writer);
103 }
104 public bool LoadPostData(string postDataKey, NameValueCollection postCollection)
105 {
106 string oldText = this.Text;
107 string newText = postCollection[postDataKey];
108 if (!this.ReadOnly && !oldText.Equals(newText))
109 {
110 this.Text = newText;
111 return true;
112 }
113 return false;
114 }
115 public void OnTextChanged(EventArgs e)
116 {
117 EventHandler handler1 = (EventHandler)base.Events[InventTextBox.EventTextChanged];
118 if (handler1 != null)
119 {
120 handler1(this, e);
121 }
122 }
123 public void RaisePostDataChangedEvent()
124 {
125 OnTextChanged(EventArgs.Empty);
126 }
127 bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
128 {
129 return this.LoadPostData(postDataKey, postCollection);
130 }
131
132 void IPostBackDataHandler.RaisePostDataChangedEvent()
133 {
134 this.RaisePostDataChangedEvent();
135 }
136 [Bindable(true), Category("Behavior")]
137 public string Text
138 {
139 get
140 {
141 string text = (string)ViewState["Text"];
142 if (text != null)
143 {
144 return text;
145 }
146 else
147 {
148 return string.Empty;
149 }
150 }
151 set
152 {
153 ViewState["Text"] = value;
154 }
155 }
156 [Bindable(true), Category("Behavior")]
157 public bool ReadOnly
158 {
159 get
160 {
161 object obj = ViewState["ReadOnly"];
162 if (obj != null)
163 {
164 return (bool)obj;
165 }
166 else
167 {
168 return false;
169 }
170 }
171 set
172 {
173 ViewState["ReadOnly"] = value;
174 }
175 }
176 [Bindable(true), Category("Behavior")]
177 public bool AutoPostBack
178 {
179 get
180 {
181 object obj = ViewState["AutoPostBack"];
182 if (obj != null)
183 {
184 return (bool)obj;
185 }
186 return false;
187 }
188 set
189 {
190 ViewState["AutoPostBack"] = value;
191 }
192 }
193 public TextBoxMode TextMode
194 {
195 get
196 {
197 object obj = ViewState["TextMode"];
198 if (obj != null)
199 {
200 return (TextBoxMode)obj;
201 }
202 return TextBoxMode.SingleLine;
203 }
204 set
205 {
206 ViewState["TextMode"] = value;
207 }
208 }
209 [Description("TextBox_Rows"), DefaultValue(0), Themeable(false), Category("Behavior")]
210 public virtual int Rows
211 {
212 get
213 {
214 object obj1 = this.ViewState["Rows"];
215 if (obj1 != null)
216 {
217 return (int)obj1;
218 }
219 return 0;
220 }
221 set
222 {
223 if (value < 0)
224 {
225 throw new ArgumentOutOfRangeException("Rows", "TextBox_InvalidRows");
226 }
227 this.ViewState["Rows"] = value;
228 }
229 }
230 [Description("TextBox_Columns"), Category("Appearance"), DefaultValue(0)]
231 public virtual int Columns
232 {
233 get
234 {
235 object obj1 = this.ViewState["Columns"];
236 if (obj1 != null)
237 {
238 return (int)obj1;
239 }
240 return 0;
241 }
242 set
243 {
244 if (value < 0)
245 {
246 throw new ArgumentOutOfRangeException("Columns","TextBox_InvalidColumns");
247 }
248 this.ViewState["Columns"] = value;
249 }
250 }
251 private static readonly object EventTextChanged;
252 public enum TextBoxMode
253 {
254 SingleLine,
255 MultiLine
256 };
257 }
258
259}
260
using System;2
using System.Collections.Generic;3
using System.Text;4
using System.Web;5
using System.Drawing.Design;6
using System.Globalization;7
using System.Web.UI;8
using System.Web.UI.WebControls;9
using System.Security.Permissions;10
using System.Collections.Specialized;11
using System.ComponentModel;12
[assembly: TagPrefix("Invent.Controls", "Invent")]13
namespace InventControls14
{15
[ToolboxData("<{0}:InventTextBox runat=server></{0}:InventTextBox>")]16
public class InventTextBox : WebControl, IPostBackDataHandler, IEditableTextControl, ITextControl17
{
18
public event EventHandler TextChanged19
{20
add21
{22
base.Events.AddHandler(InventTextBox.EventTextChanged, value);23
}24
remove25
{26
base.Events.RemoveHandler(InventTextBox.EventTextChanged, value);27
}28
}29
30
static InventTextBox()31
{32
InventTextBox.EventTextChanged = new object();33
}34
35
public InventTextBox() : base(HtmlTextWriterTag.Input)36
{37
}38
protected override void AddAttributesToRender(HtmlTextWriter writer)39
{40
Page page1 = this.Page;41
if (page1 != null)42
{43
page1.VerifyRenderingInServerForm(this);44
}45
string text1 = this.UniqueID;46
if (text1 != null)47
{48
writer.AddAttribute(HtmlTextWriterAttribute.Name, text1);49
}50
string text3 = this.Text;51
if (text3.Length > 0)52
{53
writer.AddAttribute(HtmlTextWriterAttribute.Value, text3);54
}55
if (this.ReadOnly)56
{57
writer.AddAttribute(HtmlTextWriterAttribute.ReadOnly, "readonly");58
}59
60
if (this.AutoPostBack && this.Page != null)61
{62
string text4 = null;63
if (base.HasAttributes)64
{65
text4 = base.Attributes["onchange"];66
if (text4 != null)67
{68
text4 = Util.EnsureEndWithSemiColon(text4);69
base.Attributes.Remove("onchange");70
}71
}72
PostBackOptions options1 = new PostBackOptions(this, string.Empty);73
if (this.Page.Form != null)74
{75
options1.AutoPostBack = true;76
text4 = Util.MergeScript(text4, page1.ClientScript.GetPostBackEventReference(options1, true));77
writer.AddAttribute(HtmlTextWriterAttribute.Onchange, text4);78
writer.AddAttribute("language", "javascript", false);79
}80
}81
else if (page1 != null)82
{83
page1.ClientScript.RegisterForEventValidation(this.UniqueID, string.Empty);84
}85
if (this.Enabled && !base.IsEnabled)86
{87
writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");88
}89
base.AddAttributesToRender(writer);90
}91
protected override void OnPreRender(EventArgs e)92
{93
base.OnPreRender(e);94
}95
protected override void Render(HtmlTextWriter writer)96
{97
this.RenderBeginTag(writer);98
if (this.TextMode == TextBoxMode.MultiLine)99
{100
HttpUtility.HtmlEncode(this.Text, writer);101
}102
this.RenderEndTag(writer);103
}104
public bool LoadPostData(string postDataKey, NameValueCollection postCollection)105
{106
string oldText = this.Text;107
string newText = postCollection[postDataKey];108
if (!this.ReadOnly && !oldText.Equals(newText))109
{110
this.Text = newText;111
return true;112
}113
return false;114
}115
public void OnTextChanged(EventArgs e)116
{117
EventHandler handler1 = (EventHandler)base.Events[InventTextBox.EventTextChanged];118
if (handler1 != null)119
{120
handler1(this, e);121
}122
}123
public void RaisePostDataChangedEvent()124
{125
OnTextChanged(EventArgs.Empty);126
}127
bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)128
{129
return this.LoadPostData(postDataKey, postCollection);130
}131
132
void IPostBackDataHandler.RaisePostDataChangedEvent()133
{134
this.RaisePostDataChangedEvent();135
}136
[Bindable(true), Category("Behavior")]137
public string Text138
{139
get140
{141
string text = (string)ViewState["Text"];142
if (text != null)143
{144
return text;145
}146
else147
{148
return string.Empty;149
}150
}151
set152
{153
ViewState["Text"] = value;154
}155
}156
[Bindable(true), Category("Behavior")]157
public bool ReadOnly158
{159
get160
{161
object obj = ViewState["ReadOnly"];162
if (obj != null)163
{164
return (bool)obj;165
}166
else167
{168
return false;169
}170
}171
set172
{173
ViewState["ReadOnly"] = value;174
}175
}176
[Bindable(true), Category("Behavior")]177
public bool AutoPostBack178
{179
get180
{181
object obj = ViewState["AutoPostBack"];182
if (obj != null)183
{184
return (bool)obj;185
}186
return false;187
}188
set189
{190
ViewState["AutoPostBack"] = value;191
}192
}193
public TextBoxMode TextMode194
{195
get196
{197
object obj = ViewState["TextMode"];198
if (obj != null)199
{200
return (TextBoxMode)obj;201
}202
return TextBoxMode.SingleLine;203
}204
set205
{206
ViewState["TextMode"] = value;207
}208
}209
[Description("TextBox_Rows"), DefaultValue(0), Themeable(false), Category("Behavior")]210
public virtual int Rows211
{212
get213
{214
object obj1 = this.ViewState["Rows"];215
if (obj1 != null)216
{217
return (int)obj1;218
}219
return 0;220
}221
set222
{223
if (value < 0)224
{225
throw new ArgumentOutOfRangeException("Rows", "TextBox_InvalidRows");226
}227
this.ViewState["Rows"] = value;228
}229
}230
[Description("TextBox_Columns"), Category("Appearance"), DefaultValue(0)]231
public virtual int Columns232
{233
get234
{235
object obj1 = this.ViewState["Columns"];236
if (obj1 != null)237
{238
return (int)obj1;239
}240
return 0;241
}242
set243
{244
if (value < 0)245
{246
throw new ArgumentOutOfRangeException("Columns","TextBox_InvalidColumns");247
}248
this.ViewState["Columns"] = value;249
}250
}251
private static readonly object EventTextChanged;252
public enum TextBoxMode253
{254
SingleLine,255
MultiLine256
};257
}258
259
}260
浙公网安备 33010602011771号