XtraCharts > 示例 > 如何：为轴的自动日期时间刻度模式获得计算值

本示例演示了当使用了自动轴日期时间刻度模式时，如何获得为轴的日期时间网格对齐方式和度量单位只读属性而计算的取值。此外，在 ChartControl.DateTimeMeasurementUnitsCalculated ( WebChartControl.DateTimeMeasurementUnitsCalculated ) 事件中，还可以访问轴本身并定制其属性。

C#	复制代码
using DevExpress.XtraCharts; // ... private void chartControl1_DateTimeMeasurementUnitsCalculated (object sender, DateTimeMeasurementUnitsCalculatedEventArgs e) { // In this event, you can access the properties of the corresponding axis, // and obtain the automatically calculated value // for the axis date-time grid alignment and measure unit. ((AxisX)e.Axis).Title.Visible = true; ((AxisX)e.Axis).Title.Text = "The Axis Grid Alignment Unit is " + e.GridAlignment.ToString() + "\r\nThe Axis Measure Unit is " + e.MeasureUnit.ToString(); }

复制代码

using DevExpress.XtraCharts;
// ...

private void chartControl1_DateTimeMeasurementUnitsCalculated
    (object sender, DateTimeMeasurementUnitsCalculatedEventArgs e) {
    // In this event, you can access the properties of the corresponding axis, 
    // and obtain the automatically calculated value
    // for the axis date-time grid alignment and measure unit.
    ((AxisX)e.Axis).Title.Visible = true;
    ((AxisX)e.Axis).Title.Text = "The Axis Grid Alignment Unit is " + e.GridAlignment.ToString() +
        "\r\nThe Axis Measure Unit is " + e.MeasureUnit.ToString();
}

Visual Basic	复制代码
Imports DevExpress.XtraCharts ' ... Private Sub chartControl1_DateTimeMeasurementUnitsCalculated(ByVal sender As Object, _ ByVal e As DateTimeMeasurementUnitsCalculatedEventArgs) _ Handles chartControl1.DateTimeMeasurementUnitsCalculated ' In this event, you can access the properties of the corresponding axis, ' and obtain the automatically calculated value ' for the axis date-time grid alignment and measure unit. CType(e.Axis, AxisX).Title.Visible = True CType(e.Axis, AxisX).Title.Text = _ "The Axis Grid Alignment Unit is " & e.GridAlignment.ToString() & _ Constants.vbCrLf & "The Axis Measure Unit is " & e.MeasureUnit.ToString() End Sub

Visual Basic

复制代码

Imports DevExpress.XtraCharts
' ...

Private Sub chartControl1_DateTimeMeasurementUnitsCalculated(ByVal sender As Object, _ 
ByVal e As DateTimeMeasurementUnitsCalculatedEventArgs) _ 
Handles chartControl1.DateTimeMeasurementUnitsCalculated
    ' In this event, you can access the properties of the corresponding axis, 
    ' and obtain the automatically calculated value 
    ' for the axis date-time grid alignment and measure unit.
    CType(e.Axis, AxisX).Title.Visible = True
    CType(e.Axis, AxisX).Title.Text = _ 
        "The Axis Grid Alignment Unit is " & e.GridAlignment.ToString() & _
        Constants.vbCrLf & "The Axis Measure Unit is " & e.MeasureUnit.ToString()
End Sub

在下面的插图中显示了结果。

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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=E1529。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