将图表转换为图像
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图表具有视觉吸引力，并且使用户可以轻松查看数据的比较、模式和趋势。例如，与其分析几列工作表中的数字，您可以一眼看出销售额在季度期间是下降还是上升，或者实际销售额与预期销售额的比较如何。有时候，您确实需要在应用程序或网页中呈现图表。您可能需要将其插入到 Word 文档、PDF 文件、Power Point 演示文稿或其他一些场景中。您希望图表应该作为图像呈现，这样您就可以轻松地将其粘贴到您的应用程序中。图片是非常重要的。在工作过程中，人们经常需要以易于理解和易于维护的方式呈现统计和图形信息。您可能尝试使用 Office 自动化，但 Office 自动化有自身的缺点。涉及了几个原因和问题：例如，安全性、稳定性、可扩展性/速度、价格、功能等。简而言之，有许多原因，其中最重要的一个原因是 Microsoft 强烈建议不要从软件解决方案进行服务器端 Office 自动化。还有另一种选择，您可以使用 Aspose.Cells 将 Excel 图表转换为图像。
将图表转换为 EMF
//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 a sample value to "A1" cell
worksheet.Cells["A1"].PutValue(50);
//Adding a sample value to "A2" cell
worksheet.Cells["A2"].PutValue(100);
//Adding a sample value to "A3" cell
worksheet.Cells["A3"].PutValue(150);
//Adding a sample value to "B1" cell
worksheet.Cells["B1"].PutValue(4);
//Adding a sample value to "B2" cell
worksheet.Cells["B2"].PutValue(20);
//Adding a sample value to "B3" cell
worksheet.Cells["B3"].PutValue(50);
//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 Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
//Converting chart to image.
chart.ToImage(MyDir + "Chart to EMF Image.Emf", System.Drawing.Imaging.ImageFormat.Emf);
将图表转换为 BMP
//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 a sample value to "A1" cell
worksheet.Cells["A1"].PutValue(50);
//Adding a sample value to "A2" cell
worksheet.Cells["A2"].PutValue(100);
//Adding a sample value to "A3" cell
worksheet.Cells["A3"].PutValue(150);
//Adding a sample value to "B1" cell
worksheet.Cells["B1"].PutValue(4);
//Adding a sample value to "B2" cell
worksheet.Cells["B2"].PutValue(20);
//Adding a sample value to "B3" cell
worksheet.Cells["B3"].PutValue(50);
//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 Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
//Converting chart to image.
chart.ToImage(MyDir + "Chart to BMP Image.Bmp", System.Drawing.Imaging.ImageFormat.Bmp);
将图表转换为 JPEG
//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 a sample value to "A1" cell
worksheet.Cells["A1"].PutValue(50);
//Adding a sample value to "A2" cell
worksheet.Cells["A2"].PutValue(100);
//Adding a sample value to "A3" cell
worksheet.Cells["A3"].PutValue(150);
//Adding a sample value to "B1" cell
worksheet.Cells["B1"].PutValue(4);
//Adding a sample value to "B2" cell
worksheet.Cells["B2"].PutValue(20);
//Adding a sample value to "B3" cell
worksheet.Cells["B3"].PutValue(50);
//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 Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
//Converting chart to image.
chart.ToImage(MyDir + "Chart to JPEG Image.Jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);
将图表转换为PNG格式
//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 a sample value to "A1" cell
worksheet.Cells["A1"].PutValue(50);
//Adding a sample value to "A2" cell
worksheet.Cells["A2"].PutValue(100);
//Adding a sample value to "A3" cell
worksheet.Cells["A3"].PutValue(150);
//Adding a sample value to "B1" cell
worksheet.Cells["B1"].PutValue(4);
//Adding a sample value to "B2" cell
worksheet.Cells["B2"].PutValue(20);
//Adding a sample value to "B3" cell
worksheet.Cells["B3"].PutValue(50);
//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 Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
//Converting chart to image.
chart.ToImage(MyDir + "Chart to PNG Image.Png", System.Drawing.Imaging.ImageFormat.Png);
将图表转换为TIFF格式
//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 a sample value to "A1" cell
worksheet.Cells["A1"].PutValue(50);
//Adding a sample value to "A2" cell
worksheet.Cells["A2"].PutValue(100);
//Adding a sample value to "A3" cell
worksheet.Cells["A3"].PutValue(150);
//Adding a sample value to "B1" cell
worksheet.Cells["B1"].PutValue(4);
//Adding a sample value to "B2" cell
worksheet.Cells["B2"].PutValue(20);
//Adding a sample value to "B3" cell
worksheet.Cells["B3"].PutValue(50);
//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 Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
//Converting chart to image.
chart.ToImage(MyDir + "Chart to Tiff Image.Tiff", System.Drawing.Imaging.ImageFormat.Tiff);
将图表转换为多页TIFF格式
//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 a sample value to "A1" cell
worksheet.Cells["A1"].PutValue(50);
//Adding a sample value to "A2" cell
worksheet.Cells["A2"].PutValue(100);
//Adding a sample value to "A3" cell
worksheet.Cells["A3"].PutValue(150);
//Adding a sample value to "B1" cell
worksheet.Cells["B1"].PutValue(4);
//Adding a sample value to "B2" cell
worksheet.Cells["B2"].PutValue(20);
//Adding a sample value to "B3" cell
worksheet.Cells["B3"].PutValue(50);
//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 Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
ImageOrPrintOptions options = new ImageOrPrintOptions();
options.HorizontalResolution = 300;
options.VerticalResolution = 300;
options.TiffCompression = TiffCompression.CompressionLZW;
options.IsCellAutoFit = false;
options.ImageFormat = System.Drawing.Imaging.ImageFormat.Tiff;
options.OnePagePerSheet = true;
//Converting chart to image.
chart.ToImage(MyDir + "Chart to Tiff Image.tiff", options);