为图表设置数据源

在我们之前的主题中，我们已经提供了许多示例来演示如何为图表设置数据源，但在本主题中，我们将提供有关可以为图表设置的数据类型的更多详细信息。

设置图表数据

在使用 Aspose.Cells 处理图表时，有两种类型的数据需要处理，如下所示：

• 图表数据。
• 类别数据。

图表数据

图表数据是我们用作构建图表的数据源的数据。我们可以通过调用系列合集对象的添加方法。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

// Create directory if it is not already present.
bool IsExists = System.IO.Directory.Exists(dataDir);
if (!IsExists)
    System.IO.Directory.CreateDirectory(dataDir);

// Instantiating a Workbook object
Workbook workbook = new Workbook();

// Adding a new worksheet to the Excel object
int sheetIndex = workbook.Worksheets.Add();

// Obtaining the reference of the newly added worksheet by passing its sheet index
Worksheet worksheet = workbook.Worksheets[sheetIndex];

// Adding sample values to cells
worksheet.Cells["A1"].PutValue(50);
worksheet.Cells["A2"].PutValue(100);
worksheet.Cells["A3"].PutValue(170);
worksheet.Cells["A4"].PutValue(300);
worksheet.Cells["B1"].PutValue(160);
worksheet.Cells["B2"].PutValue(32);
worksheet.Cells["B3"].PutValue(50);
worksheet.Cells["B4"].PutValue(40);

// Adding sample values to cells as category data
worksheet.Cells["C1"].PutValue("Q1");
worksheet.Cells["C2"].PutValue("Q2");
worksheet.Cells["C3"].PutValue("Y1");
worksheet.Cells["C4"].PutValue("Y2");

// Adding a chart to the worksheet
int chartIndex = worksheet.Charts.Add(Aspose.Cells.Charts.ChartType.Column, 5, 0, 15, 5);

// Accessing the instance of the newly added chart
Aspose.Cells.Charts.Chart chart = worksheet.Charts[chartIndex];

// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B4"
chart.NSeries.Add("A1:B4", true);

            
// Saving the Excel file
workbook.Save(dataDir + "output.xls");

类别数据

分类数据用于图表数据的标注，可以添加到系列合集通过使用其类别数据财产。下面给出一个完整的例子来演示图表和类别数据的使用。执行上述示例代码后，工作表中将添加一个柱形图，如下所示。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

// Create directory if it is not already present.
bool IsExists = System.IO.Directory.Exists(dataDir);
if (!IsExists)
    System.IO.Directory.CreateDirectory(dataDir);

// Instantiating a Workbook object
Workbook workbook = new Workbook();

// Adding a new worksheet to the Excel object
int sheetIndex = workbook.Worksheets.Add();

// Obtaining the reference of the newly added worksheet by passing its sheet index
Worksheet worksheet = workbook.Worksheets[sheetIndex];

// Adding sample values to cells
worksheet.Cells["A1"].PutValue(10);
worksheet.Cells["A2"].PutValue(100);
worksheet.Cells["A3"].PutValue(170);
worksheet.Cells["A4"].PutValue(200);
worksheet.Cells["B1"].PutValue(120);
worksheet.Cells["B2"].PutValue(320);
worksheet.Cells["B3"].PutValue(50);
worksheet.Cells["B4"].PutValue(40);

// Adding sample values to cells as category data
worksheet.Cells["C1"].PutValue("Q1");
worksheet.Cells["C2"].PutValue("Q2");
worksheet.Cells["C3"].PutValue("Y1");
worksheet.Cells["C4"].PutValue("Y2");

// Adding a chart to the worksheet
int chartIndex = worksheet.Charts.Add(Aspose.Cells.Charts.ChartType.Column, 5, 0, 15, 5);

// Accessing the instance of the newly added chart
Aspose.Cells.Charts.Chart chart = worksheet.Charts[chartIndex];

// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B4"
chart.NSeries.Add("A1:B4", true);

// Setting the data source for the category data of SeriesCollection
chart.NSeries.CategoryData = "C1:C4";

// Saving the Excel file
workbook.Save(dataDir + "output.xls");

推进主题

• 复制行或范围时将图表的数据源更改为目标工作表
• 创建动态图表
• 使用 Chart.SetChartDataRange 方法设置图表的简便方法
• 查找图表系列中点的 X 和 Y 值类型