本示例展示了如何确定鼠标指针是否悬停在轴标题上，如果是，就在消息框中显示它的类型 (AxisTitleX 或 AxisTitleY)。

C#	复制代码
using System; using System.Windows.Forms; using DevExpress.XtraCharts; // ... private void chartControl1_ObjectHotTracked(object sender, HotTrackEventArgs e) { if (e.AdditionalObject is AxisTitle) { MessageBox.Show(e.AdditionalObject.GetType().ToString()); } }

复制代码

using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...

private void chartControl1_ObjectHotTracked(object sender, HotTrackEventArgs e) {
    if (e.AdditionalObject is AxisTitle) {
        MessageBox.Show(e.AdditionalObject.GetType().ToString());
    }
}

Visual Basic	复制代码
Imports System Imports System.Windows.Forms Imports DevExpress.XtraCharts ' ... Private Sub chartControl1_ObjectHotTracked(ByVal sender As Object, _ ByVal e As HotTrackEventArgs) Handles chartControl1.ObjectHotTracked If TypeOf e.AdditionalObject Is AxisTitle Then MessageBox.Show(e.AdditionalObject.GetType().ToString()) End If End Sub

Visual Basic

复制代码

Imports System
Imports System.Windows.Forms
Imports DevExpress.XtraCharts
' ...

Private Sub chartControl1_ObjectHotTracked(ByVal sender As Object, _ 
ByVal e As HotTrackEventArgs) Handles chartControl1.ObjectHotTracked
    If TypeOf e.AdditionalObject Is AxisTitle Then
        MessageBox.Show(e.AdditionalObject.GetType().ToString())
    End If
End Sub

在下面的插图中显示了结果。

Show Me
在 DevExpress Code Central 数据库中可以找到完整的示例项目，网址是 http://www.devexpress.com/example=E1727。取决于目标平台类型 (ASP.NET、WinForms 等)，可以在线运行本示例，或者下载自动可执行的示例。

参阅