1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
//------------------------------------------------------------------------------
// <copyright file="BoundColumn.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.ComponentModel;
using System.Globalization;
using System.Web;
using System.Web.UI;
using System.Web.Util;
/// <devdoc>
/// <para>Creates a column bounded to a data field in a <see cref='System.Web.UI.WebControls.DataGrid'/>.</para>
/// </devdoc>
public class BoundColumn : DataGridColumn {
/// <devdoc>
/// <para>Specifies a string that represents "this". This field is read-only. </para>
/// </devdoc>
public static readonly string thisExpr = "!";
private PropertyDescriptor boundFieldDesc;
private bool boundFieldDescValid;
private string boundField;
private string formatting;
/// <devdoc>
/// <para>Initializes a new instance of a <see cref='System.Web.UI.WebControls.BoundColumn'/> class.</para>
/// </devdoc>
public BoundColumn() {
}
/// <devdoc>
/// <para> Gets or sets the field name from the data model bound to this column.</para>
/// </devdoc>
[
WebCategory("Data"),
DefaultValue(""),
WebSysDescription(SR.BoundColumn_DataField)
]
public virtual string DataField {
get {
object o = ViewState["DataField"];
if (o != null)
return (string)o;
return String.Empty;
}
set {
ViewState["DataField"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the display format of data in this
/// column.</para>
/// </devdoc>
[
WebCategory("Behavior"),
DefaultValue(""),
WebSysDescription(SR.BoundColumn_DataFormatString)
]
public virtual string DataFormatString {
get {
object o = ViewState["DataFormatString"];
if (o != null)
return (string)o;
return String.Empty;
}
set {
ViewState["DataFormatString"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the property that prevents modification to data
/// in this column.</para>
/// </devdoc>
[
WebCategory("Behavior"),
DefaultValue(false),
WebSysDescription(SR.BoundColumn_ReadOnly)
]
public virtual bool ReadOnly {
get {
object o = ViewState["ReadOnly"];
if (o != null)
return (bool)o;
return false;
}
set {
ViewState["ReadOnly"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// </devdoc>
protected virtual string FormatDataValue(object dataValue) {
string formattedValue = String.Empty;
if (!DataBinder.IsNull(dataValue)) {
if (formatting.Length == 0) {
formattedValue = dataValue.ToString();
}
else {
formattedValue = String.Format(CultureInfo.CurrentCulture, formatting, dataValue);
}
}
return formattedValue;
}
/// <devdoc>
/// </devdoc>
public override void Initialize() {
base.Initialize();
boundFieldDesc = null;
boundFieldDescValid = false;
boundField = DataField;
formatting = DataFormatString;
}
/// <devdoc>
/// <para>Initializes a cell in the DataGridColumn.</para>
/// </devdoc>
public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) {
base.InitializeCell(cell, columnIndex, itemType);
Control childControl = null;
Control boundControl = null;
switch (itemType) {
case ListItemType.Header:
case ListItemType.Footer:
break;
case ListItemType.Item:
case ListItemType.AlternatingItem:
case ListItemType.SelectedItem:
if (DataField.Length != 0) {
boundControl = cell;
}
break;
case ListItemType.EditItem:
if (ReadOnly == true) {
goto case ListItemType.Item;
}
else {
//
TextBox editor = new TextBox();
childControl = editor;
if (boundField.Length != 0) {
boundControl = editor;
}
}
break;
}
if (childControl != null) {
cell.Controls.Add(childControl);
}
if (boundControl != null) {
boundControl.DataBinding += new EventHandler(this.OnDataBindColumn);
}
}
/// <devdoc>
/// </devdoc>
private void OnDataBindColumn(object sender, EventArgs e) {
Debug.Assert(DataField.Length != 0, "Shouldn't be DataBinding without a DataField");
Control boundControl = (Control)sender;
DataGridItem item = (DataGridItem)boundControl.NamingContainer;
object dataItem = item.DataItem;
if (boundFieldDescValid == false) {
if (!boundField.Equals(thisExpr)) {
boundFieldDesc = TypeDescriptor.GetProperties(dataItem).Find(boundField, true);
if ((boundFieldDesc == null) && !DesignMode) {
throw new HttpException(SR.GetString(SR.Field_Not_Found, boundField));
}
}
boundFieldDescValid = true;
}
object data = dataItem;
string dataValue;
if ((boundFieldDesc == null) && DesignMode) {
dataValue = SR.GetString(SR.Sample_Databound_Text);
}
else {
if (boundFieldDesc != null) {
data = boundFieldDesc.GetValue(dataItem);
}
dataValue = FormatDataValue(data);
}
if (boundControl is TableCell) {
if (dataValue.Length == 0) {
dataValue = " ";
}
((TableCell)boundControl).Text = dataValue;
}
else {
Debug.Assert(boundControl is TextBox, "Expected the bound control to be a TextBox");
((TextBox)boundControl).Text = dataValue;
}
}
}
}
|
