跟踪Excel转换为TIFF的进度
可能的使用场景
有时转换大型Excel文件可能需要一些时间。在此期间,您可能希望显示文档转换进度,而不只是加载屏幕,以增强应用程序的可用性。Aspose.Cells支持通过提供IPageSavingCallback接口来跟踪文档转换进程。IPageSavingCallback接口提供了PageStartSaving和PageEndSaving方法,您可以在自定义类中实现。还可以控制呈现哪些页面,如TestPageSavingCallback自定义类所示。
跟踪Excel转换为TIFF的进度
以下代码示例加载源 Excel 文件,并通过使用实现了 IPageSavingCallback 接口的 TestPageSavingCallback 自定义类在控制台中打印其转换进度。生成的输出文件已附上供您参考。
示例代码
// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET | |
//Source directory | |
string sourceDir = RunExamples.Get_SourceDirectory(); | |
//Output directory | |
string outputDir = RunExamples.Get_OutputDirectory(); | |
Workbook workbook = new Workbook(sourceDir + "sampleUseWorkbookRenderForImageConversion.xlsx"); | |
ImageOrPrintOptions opts = new ImageOrPrintOptions(); | |
opts.PageSavingCallback = new TestTiffPageSavingCallback(); | |
opts.ImageType = ImageType.Tiff; | |
WorkbookRender wr = new WorkbookRender(workbook, opts); | |
wr.ToImage(outputDir + "DocumentConversionProgressForTiff_out.tiff"); |
以下是TestTiffPageSavingCallback自定义类的代码。
// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET | |
public class TestTiffPageSavingCallback : IPageSavingCallback | |
{ | |
public void PageStartSaving(PageStartSavingArgs args) | |
{ | |
Console.WriteLine("Start saving page index {0} of pages {1}", args.PageIndex, args.PageCount); | |
//don't output pages before page index 2. | |
if (args.PageIndex < 2) | |
{ | |
args.IsToOutput = false; | |
} | |
} | |
public void PageEndSaving(PageEndSavingArgs args) | |
{ | |
Console.WriteLine("End saving page index {0} of pages {1}", args.PageIndex, args.PageCount); | |
//don't output pages after page index 8. | |
if (args.PageIndex >= 8) | |
{ | |
args.HasMorePages = false; | |
} | |
} | |
} |
控制台输出
Start saving page index 0 of pages 10</br>
End saving page index 0 of pages 10</br>
Start saving page index 1 of pages 10</br>
End saving page index 1 of pages 10</br>
Start saving page index 2 of pages 10</br>
End saving page index 2 of pages 10</br>
Start saving page index 3 of pages 10</br>
End saving page index 3 of pages 10</br>
Start saving page index 4 of pages 10</br>
End saving page index 4 of pages 10</br>
Start saving page index 5 of pages 10</br>
End saving page index 5 of pages 10</br>
Start saving page index 6 of pages 10</br>
End saving page index 6 of pages 10</br>
Start saving page index 7 of pages 10</br>
End saving page index 7 of pages 10</br>
Start saving page index 8 of pages 10</br>
End saving page index 8 of pages 10</br>