Control.DataBindings 属性
为该控件获取数据绑定。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）
语法
声明
Public ReadOnly Property DataBindings As ControlBindingsCollection
用法
Dim instance As Control
Dim value As ControlBindingsCollection
value = instance.DataBindings
public ControlBindingsCollection DataBindings { get; }
public:
virtual property ControlBindingsCollection^ DataBindings {
ControlBindingsCollection^ get () sealed;
}
/** @property */
public final ControlBindingsCollection get_DataBindings ()
public final function get DataBindings () : ControlBindingsCollection
属性值
ControlBindingsCollection，它包含该控件的 Binding 对象。
备注
使用 DataBindings 属性来访问 ControlBindingsCollection。通过向集合中添加 Binding 对象，可以将控件的任何属性绑定到对象的属性。
示例
下面的代码示例将 Binding 对象添加到五个控件的 ControlBindingsCollection 中：四个 TextBox 控件和一个 DateTimePicker 控件。通过 Control 类的 DataBindings 属性来访问 ControlBindingsCollection。
Protected Sub BindControls()
' Create two Binding objects for the first two TextBox
' controls. The data-bound property for both controls
' is the Text property. The data source is a DataSet
' (ds). The data member is specified by a navigation
' path in the form : TableName.ColumnName.
textBox1.DataBindings.Add _
(New Binding("Text", ds, "customers.custName"))
textBox2.DataBindings.Add _
(New Binding("Text", ds, "customers.custID"))
' Bind the DateTimePicker control by adding a new Binding.
' The data member of the DateTimePicker is specified by a
' navigation path in the form: TableName.RelationName.ColumnName.
DateTimePicker1.DataBindings.Add _
(New Binding("Value", ds, "customers.CustToOrders.OrderDate"))
' Create a new Binding using the DataSet and a
' navigation path(TableName.RelationName.ColumnName).
' Add event delegates for the Parse and Format events to
' the Binding object, and add the object to the third
' TextBox control's BindingsCollection. The delegates
' must be added before adding the Binding to the
' collection; otherwise, no formatting occurs until
' the Current object of the BindingManagerBase for
' the data source changes.
Dim b As New Binding("Text", ds, "customers.custToOrders.OrderAmount")
AddHandler b.Parse, AddressOf CurrencyStringToDecimal
AddHandler b.Format, AddressOf DecimalToCurrencyString
textBox3.DataBindings.Add(b)
' Bind the fourth TextBox to the Value of the
' DateTimePicker control. This demonstrates how one control
' can be bound to another.
textBox4.DataBindings.Add("Text", DateTimePicker1, "Value")
Dim bmText As BindingManagerBase = Me.BindingContext(DateTimePicker1)
' Print the Type of the BindingManagerBase, which is
' a PropertyManager because the data source
' returns only a single property value.
Console.WriteLine(bmText.GetType().ToString())
' Print the count of managed objects, which is 1.
Console.WriteLine(bmText.Count)
' Get the BindingManagerBase for the Customers table.
bmCustomers = Me.BindingContext(ds, "Customers")
' Print the Type and count of the BindingManagerBase.
' Because the data source inherits from IBindingList,
' it is a RelatedCurrencyManager (derived from CurrencyManager).
Console.WriteLine(bmCustomers.GetType().ToString())
Console.WriteLine(bmCustomers.Count)
' Get the BindingManagerBase for the Orders of the current
' customer using a navigation path: TableName.RelationName.
bmOrders = Me.BindingContext(ds, "customers.CustToOrders")
End Sub
protected void BindControls()
{
/* Create two Binding objects for the first two TextBox
controls. The data-bound property for both controls
is the Text property. The data source is a DataSet
(ds). The data member is specified by a navigation
path in the form : TableName.ColumnName. */
textBox1.DataBindings.Add(new Binding
("Text", ds, "customers.custName"));
textBox2.DataBindings.Add(new Binding
("Text", ds, "customers.custID"));
/* Bind the DateTimePicker control by adding a new Binding.
The data member of the DateTimePicker is specified by a
navigation path in the form: TableName.RelationName.ColumnName. */
DateTimePicker1.DataBindings.Add(new
Binding("Value", ds, "customers.CustToOrders.OrderDate"));
/* Create a new Binding using the DataSet and a
navigation path(TableName.RelationName.ColumnName).
Add event delegates for the Parse and Format events to
the Binding object, and add the object to the third
TextBox control's BindingsCollection. The delegates
must be added before adding the Binding to the
collection; otherwise, no formatting occurs until
the Current object of the BindingManagerBase for
the data source changes. */
Binding b = new Binding
("Text", ds, "customers.custToOrders.OrderAmount");
b.Parse += new ConvertEventHandler(CurrencyStringToDecimal);
b.Format += new ConvertEventHandler(DecimalToCurrencyString);
textBox3.DataBindings.Add(b);
/*Bind the fourth TextBox to the Value of the
DateTimePicker control. This demonstrates how one control
can be bound to another.*/
textBox4.DataBindings.Add("Text", DateTimePicker1,"Value");
BindingManagerBase bmText = this.BindingContext[
DateTimePicker1];
/* Print the Type of the BindingManagerBase, which is
a PropertyManager because the data source
returns only a single property value. */
Console.WriteLine(bmText.GetType().ToString());
// Print the count of managed objects, which is 1.
Console.WriteLine(bmText.Count);
// Get the BindingManagerBase for the Customers table.
bmCustomers = this.BindingContext [ds, "Customers"];
/* Print the Type and count of the BindingManagerBase.
Because the data source inherits from IBindingList,
it is a RelatedCurrencyManager (derived from CurrencyManager). */
Console.WriteLine(bmCustomers.GetType().ToString());
Console.WriteLine(bmCustomers.Count);
/* Get the BindingManagerBase for the Orders of the current
customer using a navigation path: TableName.RelationName. */
bmOrders = this.BindingContext[ds, "customers.CustToOrders"];
}
void BindControls()
{
/* Create two Binding objects for the first two TextBox
controls. The data-bound property for both controls
is the Text property. The data source is a DataSet
(ds). The data member is specified by a navigation
path in the form : TableName.ColumnName. */
textBox1->DataBindings->Add( gcnew Binding( "Text",ds,"customers.custName" ) );
textBox2->DataBindings->Add( gcnew Binding( "Text",ds,"customers.custID" ) );
/* Bind the DateTimePicker control by adding a new Binding.
The data member of the DateTimePicker is specified by a
navigation path in the form: TableName.RelationName.ColumnName. */
DateTimePicker1->DataBindings->Add( gcnew Binding( "Value",ds,"customers.CustToOrders.OrderDate" ) );
/* Create a new Binding using the DataSet and a
navigation path(TableName.RelationName.ColumnName).
Add event delegates for the Parse and Format events to
the Binding object, and add the object to the third
TextBox control's BindingsCollection. The delegates
must be added before adding the Binding to the
collection; otherwise, no formatting occurs until
the Current object of the BindingManagerBase for
the data source changes. */
Binding^ b = gcnew Binding( "Text",ds,"customers.custToOrders.OrderAmount" );
b->Parse += gcnew ConvertEventHandler( this, &Form1::CurrencyStringToDecimal );
b->Format += gcnew ConvertEventHandler( this, &Form1::DecimalToCurrencyString );
textBox3->DataBindings->Add( b );
/*Bind the fourth TextBox to the Value of the
DateTimePicker control. This demonstrates how one control
can be bound to another.*/
textBox4->DataBindings->Add( "Text", DateTimePicker1, "Value" );
BindingManagerBase^ bmText = this->BindingContext[ DateTimePicker1 ];
/* Print the Type of the BindingManagerBase, which is
a PropertyManager because the data source
returns only a single property value. */
Console::WriteLine( bmText->GetType() );
// Print the count of managed objects, which is 1.
Console::WriteLine( bmText->Count );
// Get the BindingManagerBase for the Customers table.
bmCustomers = this->BindingContext[ds, "Customers"];
/* Print the Type and count of the BindingManagerBase.
Because the data source inherits from IBindingList,
it is a RelatedCurrencyManager (derived from CurrencyManager). */
Console::WriteLine( bmCustomers->GetType() );
Console::WriteLine( bmCustomers->Count );
/* Get the BindingManagerBase for the Orders of the current
customer using a navigation path: TableName.RelationName. */
bmOrders = this->BindingContext[ds, "customers.CustToOrders"];
}
protected void BindControls()
{
/* Create two Binding objects for the first two TextBox
controls. The data-bound property for both controls
is the Text property. The data source is a DataSet
(ds). The data member is specified by a navigation
path in the form : TableName.ColumnName.
*/
textBox1.get_DataBindings().
Add(new Binding("Text", ds, "customers.custName"));
textBox2.get_DataBindings().
Add(new Binding("Text", ds, "customers.custID"));
/* Bind the DateTimePicker control by adding a new Binding.
The data member of the DateTimePicker is specified by a
navigation path in the form: TableName.RelationName.ColumnName.
*/
dateTimePicker1.get_DataBindings().
Add(new Binding("Value", ds,
"customers.CustToOrders.OrderDate"));
/* Create a new Binding using the DataSet and a
navigation path(TableName.RelationName.ColumnName).
Add event delegates for the Parse and Format events to
the Binding object, and add the object to the third
TextBox control's BindingsCollection. The delegates
must be added before adding the Binding to the
collection; otherwise, no formatting occurs until
the Current object of the BindingManagerBase for
the data source changes.
*/
Binding b = new Binding("Text", ds,
"customers.custToOrders.OrderAmount");
b.add_Parse(new ConvertEventHandler(CurrencyStringToDecimal));
b.add_Format(new ConvertEventHandler(DecimalToCurrencyString));
textBox3.get_DataBindings().Add(b);
/* Bind the fourth TextBox to the Value of the
DateTimePicker control. This demonstrates how one control
can be bound to another.
*/
textBox4.get_DataBindings().Add("Text", dateTimePicker1, "Value");
BindingManagerBase bmText
= this.get_BindingContext().get_Item(dateTimePicker1);
/* Print the Type of the BindingManagerBase, which is
a PropertyManager because the data source
returns only a single property value.
*/
Console.WriteLine(bmText.GetType().ToString());
// Print the count of managed objects, which is 1.
Console.WriteLine(bmText.get_Count());
// Get the BindingManagerBase for the Customers table.
bmCustomers = this.get_BindingContext().get_Item(ds, "Customers");
/* Print the Type and count of the BindingManagerBase.
Because the data source inherits from IBindingList,
it is a RelatedCurrencyManager (derived from CurrencyManager).
*/
Console.WriteLine(bmCustomers.GetType().ToString());
Console.WriteLine(bmCustomers.get_Count());
/* Get the BindingManagerBase for the Orders of the current
customer using a navigation path: TableName.RelationName.
*/
bmOrders
= this.get_BindingContext().get_Item(ds, "customers.CustToOrders");
} //BindControls
protected function BindControls()
{
/* Create two Binding objects for the first two TextBox
controls. The data-bound property for both controls
is the Text property. The data source is a DataSet
(ds). The data member is specified by a navigation
path in the form : TableName.ColumnName. */
textBox1.DataBindings.Add(new Binding
("Text", ds, "customers.custName"));
textBox2.DataBindings.Add(new Binding
("Text", ds, "customers.custID"));
/* Bind the DateTimePicker control by adding a new Binding.
The data member of the DateTimePicker is specified by a
navigation path in the form: TableName.RelationName.ColumnName. */
DateTimePicker1.DataBindings.Add(new
Binding("Value", ds, "customers.CustToOrders.OrderDate"));
/* Create a new Binding import the DataSet and a
navigation path(TableName.RelationName.ColumnName).
Add event delegates for the Parse and Format events to
the Binding object, and add the object to the third
TextBox control's BindingsCollection. The delegates
must be added before adding the Binding to the
collection; otherwise, no formatting occurs until
the Current object of the BindingManagerBase for
the data source changes. */
var b : Binding = new Binding
("Text", ds, "customers.custToOrders.OrderAmount");
b.add_Parse(CurrencyStringToDecimal);
b.add_Format(DecimalToCurrencyString);
textBox3.DataBindings.Add(b);
/*Bind the fourth TextBox to the Value of the
DateTimePicker control. This demonstrates how one control
can be bound to another.*/
textBox4.DataBindings.Add("Text", DateTimePicker1,"Value");
var bmText : BindingManagerBase = this.BindingContext[
DateTimePicker1];
/* Print the Type of the BindingManagerBase, which is
a PropertyManager because the data source
returns only a single property value. */
Console.WriteLine(bmText.GetType().ToString());
// Print the count of managed objects, which is 1.
Console.WriteLine(bmText.Count);
// Get the BindingManagerBase for the Customers table.
bmCustomers = this.BindingContext [ds, "Customers"];
/* Print the Type and count of the BindingManagerBase.
Because the data source inherits from IBindingList,
it is a RelatedCurrencyManager (derived from CurrencyManager). */
Console.WriteLine(bmCustomers.GetType().ToString());
Console.WriteLine(bmCustomers.Count);
/* Get the BindingManagerBase for the Orders of the current
customer import a navigation path: TableName.RelationName. */
bmOrders = this.BindingContext[ds, "customers.CustToOrders"];
}
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0
请参见
参考
Control 类
Control 成员
System.Windows.Forms 命名空间
BindingContext 类
Binding 类
BindingManagerBase 类