DrawListViewColumnHeaderEventArgs.Header 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

获取表示要绘制的列标题的 ColumnHeader。

public:
 property System::Windows::Forms::ColumnHeader ^ Header { System::Windows::Forms::ColumnHeader ^ get(); };

public System.Windows.Forms.ColumnHeader Header { get; }

public System.Windows.Forms.ColumnHeader? Header { get; }

member this.Header : System.Windows.Forms.ColumnHeader

Public ReadOnly Property Header As ColumnHeader

属性值

ColumnHeader

表示列标题的 ColumnHeader。

示例

下面的代码示例演示如何在应用程序中使用 Header 为控件提供自定义绘图 ListView 的属性。

有关完整示例，请参阅 DrawListViewColumnHeaderEventArgs 概述参考主题。

// 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

当属性没有提供足够的信息以满足你的需求时， State 此属性非常有用。 该 State 属性仅提供可用于确定鼠标是否位于列标题上的基本状态信息。 另一方面，该 Header 属性允许访问表示标头的所有成员 ColumnHeader 。

另请参阅

• ColumnHeader
• ListView
• DrawColumnHeader
• OwnerDraw