我有 C# 编写的 winform,显示了一个 excel 折线图。我有基本的工作,但系列名称有一个小问题。
我的图表应该有 4 个系列(即 4 行),有 N 条记录,这意味着 excel 是 4 x N 表。当然,我有一些额外的块,轴名称以 5 x (N+1) 结尾
这是代码:(count
记录数在哪里)
Microsoft.Office.Interop.Excel.Range chartRange;
Microsoft.Office.Interop.Excel.ChartObjects xlCharts = (Microsoft.Office.Interop.Excel.ChartObjects)xlWorkSheet.ChartObjects(Type.Missing);
Microsoft.Office.Interop.Excel.ChartObject myChart = (Microsoft.Office.Interop.Excel.ChartObject)xlCharts.Add(10, 80, 400, 350);
Microsoft.Office.Interop.Excel.Chart chartPage = myChart.Chart;
if (count == 0)
{
chartRange = xlWorkSheet.get_Range("A1", "E2");
}
else
{
chartRange = xlWorkSheet.get_Range("A1", "E" + (count + 1));
}
chartPage.SetSourceData(chartRange, misValue);
//X-Axis
if (count == 0)
{
chartRange = xlWorkSheet.get_Range("A2", "A2");
}
else
{
chartRange = xlWorkSheet.get_Range("A2", "A" + (count + 1));
}
Microsoft.Office.Interop.Excel.Axis xAxis = (Microsoft.Office.Interop.Excel.Axis)chartPage.Axes(Microsoft.Office.Interop.Excel.XlAxisType.xlCategory, Microsoft.Office.Interop.Excel.XlAxisGroup.xlPrimary);
xAxis.CategoryNames = chartRange;
chartPage.ChartType = Microsoft.Office.Interop.Excel.XlChartType.xlLine;
Microsoft.Office.Interop.Excel.SeriesCollection seriesCollection = chartPage.SeriesCollection();
Console.WriteLine("count "+seriesCollection.Count);
//Series name
if (count > 0)
{
for (int i = 1; i < 5; i++)
{
Microsoft.Office.Interop.Excel.Series series1 = chartPage.SeriesCollection(i);
switch (i)
{
case 1:
series1.Name = "Line1";
break;
case 2:
series1.Name = "Line2";
break;
case 3:
series1.Name = "Line3";
break;
case 4:
series1.Name = "Line4";
break;
}
}
}
该图在 N >= 4 时没有问题(这意味着数据库中有超过 4 条记录),但在 N < 4 时显示错误,因为seriesCollection.Count
< 4。我认为seriesCollection.Count
应该始终为 4,而不取决于记录数。但我不知道代码有什么问题。感谢帮助。