《（学习笔记）两天进步一点点》（3）——应用BindingSource实现数据同步
下面的代码示例演示如何使用 BindingSource 组件，将三个控件（两个文本框控件和一个 DataGridView 控件）绑定到 DataSet 中的同一列。
该示例演示如何处理 BindingComplete 事件，并确保当一个文本框的文本值更改时，会用正确的值更新其他文本框和 DataGridView 控件。
数据同步
//
Declare the controls to be used.
private
BindingSource bindingSource1;
private
TextBox textBox1;
private
TextBox textBox2;
private
DataGridView dataGridView1;
private
void
InitializeControlsAndDataSource()
{
//
Initialize the controls and set location, size and
//
other basic properties.
this
.dataGridView1
=
new
DataGridView();
this
.bindingSource1
=
new
BindingSource();
this
.textBox1
=
new
TextBox();
this
.textBox2
=
new
TextBox();
this
.dataGridView1.ColumnHeadersHeightSizeMode
=
DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this
.dataGridView1.Dock
=
DockStyle.Top;
this
.dataGridView1.Location
=
new
Point(
0
,
0
);
this
.dataGridView1.Size
=
new
Size(
292
,
150
);
this
.textBox1.Location
=
new
Point(
132
,
156
);
this
.textBox1.Size
=
new
Size(
100
,
20
);
this
.textBox2.Location
=
new
Point(
12
,
156
);
this
.textBox2.Size
=
new
Size(
100
,
20
);
this
.ClientSize
=
new
Size(
292
,
266
);
this
.Controls.Add(
this
.textBox2);
this
.Controls.Add(
this
.textBox1);
this
.Controls.Add(
this
.dataGridView1);
//
Declare the DataSet and add a table and column.
DataSet set1
=
new
DataSet();
set1.Tables.Add(
"
Menu
"
);
set1.Tables[
0
].Columns.Add(
"
Beverages
"
);
//
Add some rows to the table.
set1.Tables[
0
].Rows.Add(
"
coffee
"
);
set1.Tables[
0
].Rows.Add(
"
tea
"
);
set1.Tables[
0
].Rows.Add(
"
hot chocolate
"
);
set1.Tables[
0
].Rows.Add(
"
milk
"
);
set1.Tables[
0
].Rows.Add(
"
orange juice
"
);
//
Set the data source to the DataSet.
bindingSource1.DataSource
=
set1;
//
Set the DataMember to the Menu table.
bindingSource1.DataMember
=
"
Menu
"
;
//
Add the control data bindings.
dataGridView1.DataSource
=
bindingSource1;
textBox1.DataBindings.Add(
"
Text
"
, bindingSource1,
"
Beverages
"
,
true
, DataSourceUpdateMode.OnPropertyChanged);
textBox2.DataBindings.Add(
"
Text
"
, bindingSource1,
"
Beverages
"
,
true
, DataSourceUpdateMode.OnPropertyChanged);
bindingSource1.BindingComplete
+=
new
BindingCompleteEventHandler(bindingSource1_BindingComplete);
}
private
void
bindingSource1_BindingComplete(
object
sender, BindingCompleteEventArgs e)
{
//
Check if the data source has been updated, and that no error has occured.
if
(e.BindingCompleteContext
==
BindingCompleteContext.DataSourceUpdate
&&
e.Exception
==
null
)
//
If not, end the current edit.
e.Binding.BindingManagerBase.EndCurrentEdit();
}
//************************************************
如何：使用 BindingSource 组件跨窗体共享绑定数据
//************************************************
使用 BindingSource 组件跨窗体共享绑定数据
using
System;
using
System.Drawing;
using
System.Windows.Forms;
using
System.Data;
namespace
BindingSourceMultipleForms
{
public
class
MainForm : Form
{
public
MainForm()
{
this
.Load
+=
new
EventHandler(MainForm_Load);
}
private
BindingSource bindingSource1;
private
Button button1;
private
void
MainForm_Load(
object
sender, EventArgs e)
{
InitializeData();
}
private
void
InitializeData()
{
bindingSource1
=
new
System.Windows.Forms.BindingSource();
//
Handle the BindingComplete event to ensure the two forms
//
remain synchronized.
bindingSource1.BindingComplete
+=
new
BindingCompleteEventHandler(bindingSource1_BindingComplete);
ClientSize
=
new
System.Drawing.Size(
292
,
266
);
DataSet dataset1
=
new
DataSet();
//
Some xml data to populate the DataSet with.
string
musicXml
=
"
<?xml version='1.0' encoding='UTF-8'?>
"
+
"
<music>
"
+
"
<recording><artist>Dave Matthews</artist>
"
+
"
<cd>Under the Table and Dreaming</cd>
"
+
"
<releaseDate>1994</releaseDate><rating>3.5</rating></recording>
"
+
"
<recording><artist>Coldplay</artist><cd>X&Y</cd>
"
+
"
<releaseDate>2005</releaseDate><rating>4</rating></recording>
"
+
"
<recording><artist>Dave Matthews</artist>
"
+
"
<cd>Live at Red Rocks</cd>
"
+
"
<releaseDate>1997</releaseDate><rating>4</rating></recording>
"
+
"
<recording><artist>U2</artist>
"
+
"
<cd>Joshua Tree</cd><releaseDate>1987</releaseDate>
"
+
"
<rating>5</rating></recording>
"
+
"
<recording><artist>U2</artist>
"
+
"
<cd>How to Dismantle an Atomic Bomb</cd>
"
+
"
<releaseDate>2004</releaseDate><rating>4.5</rating></recording>
"
+
"
<recording><artist>Natalie Merchant</artist>
"
+
"
<cd>Tigerlily</cd><releaseDate>1995</releaseDate>
"
+
"
<rating>3.5</rating></recording>
"
+
"
</music>
"
;
//
Read the xml.
System.IO.StringReader reader
=
new
System.IO.StringReader(musicXml);
dataset1.ReadXml(reader);
//
Get a DataView of the table contained in the dataset.
DataTableCollection tables
=
dataset1.Tables;
DataView view1
=
new
DataView(tables[
0
]);
//
Create a DataGridView control and add it to the form.
DataGridView datagridview1
=
new
DataGridView();
datagridview1.ReadOnly
=
true
;
datagridview1.AutoGenerateColumns
=
true
;
datagridview1.Width
=
300
;
this
.Controls.Add(datagridview1);
bindingSource1.DataSource
=
view1;
datagridview1.DataSource
=
bindingSource1;
datagridview1.Columns.Remove(
"
artist
"
);
datagridview1.Columns.Remove(
"
releaseDate
"
);
//
Create and add a button to the form.
button1
=
new
Button();
button1.AutoSize
=
true
;
button1.Text
=
"
Show/Edit Details
"
;
this
.Controls.Add(button1);
button1.Location
=
new
Point(
50
,
200
);
button1.Click
+=
new
EventHandler(button1_Click);
}
//
Handle the BindingComplete event to ensure the two forms
//
remain synchronized.
private
void
bindingSource1_BindingComplete(
object
sender, BindingCompleteEventArgs e)
{
if
(e.BindingCompleteContext
==
BindingCompleteContext.DataSourceUpdate
&&
e.Exception
==
null
)
e.Binding.BindingManagerBase.EndCurrentEdit();
}
//
The detailed form will be shown when the button is clicked.
private
void
button1_Click(
object
sender, EventArgs e)
{
DetailForm detailForm
=
new
DetailForm(bindingSource1);
detailForm.Show();
}
[STAThread]
static
void
Main()
{
Application.EnableVisualStyles();
Application.Run(
new
MainForm());
}
}
//
The detail form class.
public
class
DetailForm : Form
{
private
BindingSource formDataSource;
//
The constructor takes a BindingSource object.
public
DetailForm(BindingSource dataSource)
{
formDataSource
=
dataSource;
this
.ClientSize
=
new
Size(
240
,
200
);
TextBox textBox1
=
new
TextBox();
this
.Text
=
"
Selection Details
"
;
textBox1.Width
=
220
;
TextBox textBox2
=
new
TextBox();
TextBox textBox3
=
new
TextBox();
TextBox textBox4
=
new
TextBox();
textBox4.Width
=
30
;
textBox3.Width
=
50
;
//
Associate each text box with a column from the data source.
textBox1.DataBindings.Add(
"
Text
"
, formDataSource,
"
cd
"
,
true
, DataSourceUpdateMode.OnPropertyChanged);
textBox2.DataBindings.Add(
"
Text
"
, formDataSource,
"
artist
"
,
true
);
textBox3.DataBindings.Add(
"
Text
"
, formDataSource,
"
releaseDate
"
,
true
);
textBox4.DataBindings.Add(
"
Text
"
, formDataSource,
"
rating
"
,
true
);
textBox1.Location
=
new
Point(
10
,
10
);
textBox2.Location
=
new
Point(
10
,
40
);
textBox3.Location
=
new
Point(
10
,
80
);
textBox4.Location
=
new
Point(
10
,
120
);
this
.Controls.AddRange(
new
Control[] { textBox1, textBox2, textBox3, textBox4 });
}
}
}