我想问一下如何使用EPPLUS库更新excel中现有图表的系列值。 我还无法找到如何做到这一点。 我已成功创建图表,但仍无法更新系列值。
任何人都可以提供一些示例代码或参考链接吗?
答案 0 :(得分:3)
很抱歉这么晚回答(在搜索其他内容的时候发到了你的帖子)。如果图表有一系列指向工作表中的单元格,为什么不能直接更新单元格值?像这样,首先创建饼图:
public void PieChartCreate()
{
var file = new FileInfo(@"c:\temp\temp.xlsx");
if (file.Exists)
file.Delete();
var pck = new ExcelPackage(file);
var workbook = pck.Workbook;
var worksheet = workbook.Worksheets.Add("newsheet");
var data = new List<KeyValuePair<string, int>>
{
new KeyValuePair<string, int>("Group A", 44613),
new KeyValuePair<string, int>("Group B", 36432),
new KeyValuePair<string, int>("Group C", 6324),
new KeyValuePair<string, int>("Group A", 6745),
new KeyValuePair<string, int>("Group B", 23434),
new KeyValuePair<string, int>("Group C", 5123),
new KeyValuePair<string, int>("Group A", 34545),
new KeyValuePair<string, int>("Group B", 5472),
new KeyValuePair<string, int>("Group C", 45637),
new KeyValuePair<string, int>("Group A", 37840),
new KeyValuePair<string, int>("Group B", 20827),
new KeyValuePair<string, int>("Group C", 4548),
};
//Fill the table
var startCell = worksheet.Cells[1,1];
startCell.Offset(0, 0).Value = "Group Name";
startCell.Offset(0, 1).Value = "Value";
for (var i = 0; i < data.Count(); i++)
{
startCell.Offset(i + 1, 0).Value = data[i].Key;
startCell.Offset(i + 1, 1).Value = data[i].Value;
}
//Add the chart to the sheet
var pieChart = worksheet.Drawings.AddChart("Chart1", eChartType.Pie);
pieChart.SetPosition(data.Count + 1, 0, 0, 0);
pieChart.Title.Text = "Test Chart";
pieChart.Title.Font.Bold = true;
pieChart.Title.Font.Size = 12;
//Set the data range
var series = pieChart.Series.Add(worksheet.Cells[2, 2, data.Count, 2], worksheet.Cells[2, 1, data.Count, 1]);
var pieSeries = (ExcelPieChartSerie)series;
pieSeries.Explosion = 5;
//Format the labels
pieSeries.DataLabel.Font.Bold = true;
pieSeries.DataLabel.ShowValue = true;
pieSeries.DataLabel.ShowPercent = true;
pieSeries.DataLabel.ShowLeaderLines = true;
pieSeries.DataLabel.Separator = ";";
pieSeries.DataLabel.Position = eLabelPosition.BestFit;
//Format the legend
pieChart.Legend.Add();
pieChart.Legend.Border.Width = 0;
pieChart.Legend.Font.Size = 12;
pieChart.Legend.Font.Bold = true;
pieChart.Legend.Position = eLegendPosition.Right;
pck.Save();
}
然后更新单元格:
public void PieChartUpdate()
{
var file = new FileInfo(@"c:\temp\temp.xlsx");
if (!file.Exists)
return;
var pck = new ExcelPackage(file);
var workbook = pck.Workbook;
var worksheet = workbook.Worksheets["newsheet"];
var startCell = worksheet.Cells[2, 2];
for (var i = 0; i < 12; i++)
{
startCell.Offset(i, 0).Value = ((double)startCell.Offset(i, 0).Value) * 100;
}
file.Delete();
pck.Save();
}
如果您需要更改系列本身的定义,请按名称获取:
public void PieChartUpdateSeries()
{
var file = new FileInfo(@"c:\temp\temp.xlsx");
if (!file.Exists)
return;
var pck = new ExcelPackage(file);
var workbook = pck.Workbook;
var worksheet = workbook.Worksheets["newsheet"];
var piechart = worksheet.Drawings["Chart1"] as ExcelPieChart;
var series = piechart.Series[0];
series.XSeries = worksheet.Cells[2, 1, 7, 1].FullAddress;
series.Series = worksheet.Cells[2, 2, 7, 2].FullAddress;
file.Delete();
pck.Save();
}
希望有所帮助。