当 AllowUserToDeleteItems 属性更改时发生。
命名空间： Microsoft.VisualBasic.PowerPacks
程序集： Microsoft.VisualBasic.PowerPacks.Vs（在 Microsoft.VisualBasic.PowerPacks.Vs.dll 中）
语法
声明
Public Event AllowUserToDeleteItemsChanged As EventHandler
public event EventHandler AllowUserToDeleteItemsChanged
public:
event EventHandler^ AllowUserToDeleteItemsChanged {
void add (EventHandler^ value);
void remove (EventHandler^ value);
}
member AllowUserToDeleteItemsChanged : IEvent<EventHandler,
EventArgs>
JScript 不支持事件。
备注
当 AllowUserToDeleteItems 属性设置为 True时，用户可以删除行通过单击 BindingNavigatorDeleteItemToolStripButton 在 BindingNavigator 控件，或者通过按 delete，当 DataRepeaterItem 具有焦点时。
当 AllowUserToDeleteItems 属性设置为 False时，删除键盘函数禁用，但是， BindingNavigatorDeleteItemToolStripButton 仍处于启用状态。如果要阻止用户删除行，还应禁用或移除在 BindingNavigator 控件的 BindingNavigatorDeleteItemToolStripButton 。
有关如何处理事件的更多信息，请参见使用事件。
示例
，当 AllowUserToAddItems 属性设置为 False时，下面的代码示例演示如何禁用 BindingNavigatorDeleteItemToolStripButton 按钮。它，假设您有一个包含名为 DataRepeater1 和 BindingNavigator 控件的一个 DataRepeater 控件的窗体。
Private Sub DataRepeater1_AllowUserToDeleteItemsChanged(
) Handles DataRepeater1.AllowUserToDeleteItemsChanged
' If this event occurs during form initialization, exit.
If Me.IsHandleCreated = False Then Exit Sub
' If AllowUserToDeleteItems is False.
If DataRepeater1.AllowUserToDeleteItems = False Then
' Disable the Delete button.
BindingNavigatorDeleteItem.Enabled = False
Else
' Otherwise, enable the Delete button.
BindingNavigatorDeleteItem.Enabled = True
End If
End Sub
Private Sub BindingNavigatorDeleteItem_EnabledChanged(
) Handles BindingNavigatorDeleteItem.EnabledChanged
If DataRepeater1.AllowUserToDeleteItems = False Then
' The BindingSource resets this property when a
' new record is selected, so override it.
If BindingNavigatorDeleteItem.Enabled = True Then
BindingNavigatorDeleteItem.Enabled = False
End If
End If
End Sub
private void dataRepeater1_AllowUserToDeleteItemsChanged(object sender, System.EventArgs e)
{
// If this event occurs during form initialization, exit.
if (this.IsHandleCreated == false) { return; }
// If AllowUserToDeleteItems is False.
if (dataRepeater1.AllowUserToDeleteItems == false)
// Disable the Delete button.
{
bindingNavigatorDeleteItem.Enabled = false;
}
else
{
// Otherwise, enable the Delete button.
bindingNavigatorDeleteItem.Enabled = true;
}
}
private void bindingNavigatorDeleteItem_EnabledChanged(object sender, System.EventArgs e)
{
if (dataRepeater1.AllowUserToDeleteItems == false)
// The BindingSource resets this property when a
// new record is selected, so override it.
{
if (bindingNavigatorDeleteItem.Enabled == true)
{
bindingNavigatorDeleteItem.Enabled = false;
}
}
}
.NET Framework 安全性
- 对直接调用方的完全信任。此成员不能由部分信任的代码使用。有关更多信息，请参见通过部分受信任的代码使用库。
请参见
参考
Microsoft.VisualBasic.PowerPacks 命名空间