ListView.DrawColumnHeader 事件
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
public:
event System::Windows::Forms::DrawListViewColumnHeaderEventHandler ^ DrawColumnHeader;public event System.Windows.Forms.DrawListViewColumnHeaderEventHandler DrawColumnHeader;public event System.Windows.Forms.DrawListViewColumnHeaderEventHandler? DrawColumnHeader;member this.DrawColumnHeader : System.Windows.Forms.DrawListViewColumnHeaderEventHandler Public Custom Event DrawColumnHeader As DrawListViewColumnHeaderEventHandler 事件类型
示例
下面的代码示例提供了事件处理程序的 DrawColumnHeader 实现。 有关完整示例（包括事件处理程序的 DrawSubItem 实现），请参阅 OwnerDraw 参考主题。
// Draws column headers.
private void listView1_DrawColumnHeader(object sender,
DrawListViewColumnHeaderEventArgs e)
{
using (StringFormat sf = new StringFormat())
{
// Store the column text alignment, letting it default
// to Left if it has not been set to Center or Right.
switch (e.Header.TextAlign)
{
case HorizontalAlignment.Center:
sf.Alignment = StringAlignment.Center;
break;
case HorizontalAlignment.Right:
sf.Alignment = StringAlignment.Far;
break;
}
// Draw the standard header background.
e.DrawBackground();
// Draw the header text.
using (Font headerFont =
new Font("Helvetica", 10, FontStyle.Bold))
{
e.Graphics.DrawString(e.Header.Text, headerFont,
Brushes.Black, e.Bounds, sf);
}
}
return;
}
' Draws column headers.
Private Sub listView1_DrawColumnHeader(ByVal sender As Object, _
ByVal e As DrawListViewColumnHeaderEventArgs) _
Handles listView1.DrawColumnHeader
Dim sf As New StringFormat()
Try
' Store the column text alignment, letting it default
' to Left if it has not been set to Center or Right.
Select Case e.Header.TextAlign
Case HorizontalAlignment.Center
sf.Alignment = StringAlignment.Center
Case HorizontalAlignment.Right
sf.Alignment = StringAlignment.Far
End Select
' Draw the standard header background.
e.DrawBackground()
' Draw the header text.
Dim headerFont As New Font("Helvetica", 10, FontStyle.Bold)
Try
e.Graphics.DrawString(e.Header.Text, headerFont, _
Brushes.Black, e.Bounds, sf)
Finally
headerFont.Dispose()
End Try
Finally
sf.Dispose()
End Try
End Sub
注解
此事件允许使用所有者绘图自定义控件的外观 ListView 。 仅当 属性设置为 true 且 属性设置为 View.Details时OwnerDraw，才会引发该View属性。 控件中的每个列标题都可能发生此事件。 有关所有者绘图的详细信息，请参阅 OwnerDraw 属性参考主题。
有关处理事件的详细信息，请参阅 处理和引发事件。
