ScrollEventArgs.OldValue Property
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets the old Value of the scroll bar.
public:
property int OldValue { int get(); };
public int OldValue { get; }
member this.OldValue : int
Public ReadOnly Property OldValue As Integer
The numeric value that the Value property contained before it changed.
The following code example demonstrates the use of this member. In the example, an event handler reports on the occurrence of the ScrollableControl.Scroll event. This report helps you to learn when the event occurs and can assist you in debugging. To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.
To run the example code, paste it into a project that contains an instance of a type that inherits from ScrollableControl, such as a Panel or ContainerControl. Then name the instance ScrollableControl1
and ensure that the event handler is associated with the ScrollableControl.Scroll event.
private void ScrollableControl1_Scroll(Object sender, ScrollEventArgs e) {
System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "ScrollOrientation", e.ScrollOrientation );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "Type", e.Type );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "NewValue", e.NewValue );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "OldValue", e.OldValue );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "Scroll Event" );
}
Private Sub ScrollableControl1_Scroll(sender as Object, e as ScrollEventArgs) _
Handles ScrollableControl1.Scroll
Dim messageBoxVB as New System.Text.StringBuilder()
messageBoxVB.AppendFormat("{0} = {1}", "ScrollOrientation", e.ScrollOrientation)
messageBoxVB.AppendLine()
messageBoxVB.AppendFormat("{0} = {1}", "Type", e.Type)
messageBoxVB.AppendLine()
messageBoxVB.AppendFormat("{0} = {1}", "NewValue", e.NewValue)
messageBoxVB.AppendLine()
messageBoxVB.AppendFormat("{0} = {1}", "OldValue", e.OldValue)
messageBoxVB.AppendLine()
MessageBox.Show(messageBoxVB.ToString(),"Scroll Event")
End Sub
Termék | Verziók |
---|---|
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
.NET-visszajelzés
A(z) .NET egy nyílt forráskód projekt. Visszajelzés adásához válasszon egy hivatkozást: