Control.BindingContext 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

Source:

Control.cs

获取或设置控件的 BindingContext。

C#

[System.ComponentModel.Browsable(false)]
public virtual System.Windows.Forms.BindingContext? BindingContext { get; set; }

属性值

BindingContext

控件的 BindingContext。

实现

BindingContext

属性

BrowsableAttribute

示例

下面的代码示例创建四Binding个对象，用于将五个控件（a 和四个DateTimePickerTextBox控件）绑定到多个数据源。 BindingContext然后使用 获取BindingManagerBase每个数据源的 。

C#

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 a navigation path in the form: 
      "TableName.ColumnName". */
   text1.DataBindings.Add(new Binding
   ("Text", ds, "customers.custName"));
   text2.DataBindings.Add(new Binding
   ("Text", ds, "customers.custID"));
   
   /* Bind the DateTimePicker control by adding a new Binding. 
      The data member of the DateTimePicker is a navigation path:
      TableName.RelationName.ColumnName string. */
   DateTimePicker1.DataBindings.Add(new 
   Binding("Value", ds, "customers.CustToOrders.OrderDate"));

   /* Add event delegates for the Parse and Format events to a 
      new 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);
   text3.DataBindings.Add(b);

   // Get the BindingManagerBase for the Customers table. 
   bmCustomers = this.BindingContext [ds, "Customers"];

   /* Get the BindingManagerBase for the Orders table using the 
      RelationName. */ 
   bmOrders = this.BindingContext[ds, "customers.CustToOrders"];

   /* Bind the fourth TextBox control's Text property to the
   third control's Text property. */
   text4.DataBindings.Add("Text", text3, "Text");
}

注解

BindingContext的 Control 用于为 包含Control的所有数据绑定控件返回一BindingManagerBase个 。 使 BindingManagerBase 绑定到同一数据源的所有控件保持同步。 例如，设置 Position 的 BindingManagerBase 属性指定所有数据绑定控件指向的基础列表中的项。

有关创建新 BindingContext 并将其分配给 BindingContext 属性的详细信息， BindingContext请参阅 。

继承者说明

重写派生类中的 BindingContext 属性时，请使用基类的 BindingContext 属性来扩展基实现。 否则，必须提供所有实现。 无需同时替代 get 属性的 BindingContext 和 set 访问器;如果需要，只能重写一个。

适用于

另请参阅

• BindingContextChanged
• Binding
• BindingManagerBase