跟踪文档转换进度
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可能的使用场景
有时转换大型 visio 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仅仅是加载屏幕，以增强应用程序的可用性。 Aspose.Diagram 通过提供支持跟踪文档转换过程**IPageSavingCallback**界面。这**IPageSavingCallback**接口提供**PageStartSaving**和**PageEndSaving**您可以在自定义类中实现的方法。您还可以控制呈现哪些页面，如 T 中所示*estDiagramPageSavingCallback*自定义类。
跟踪文档转换进度
以下代码示例加载源文件 visio并使用测试页面保存回调实现的自定义类**IPageSavingCallback**界面。
示例代码
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| // For complete examples and data files, please go to https://github.com/aspose-diagram/Aspose.Diagram-for-.NET | |
| // The path to the documents directory. | |
| string dataDir = RunExamples.GetDataDir_Intro(); | |
| // call the diagram constructor to load diagram from a VSD file | |
| Diagram diagram = new Diagram(dataDir + "Drawing1.vsdx"); | |
| // create an instance PDF save options class | |
| Aspose.Diagram.Saving.PdfSaveOptions options = new Aspose.Diagram.Saving.PdfSaveOptions(); | |
| //set page saving call back | |
| options.PageSavingCallback = new TestDiagramPageSavingCallback(); | |
| // save Visio drawing | |
| diagram.Save(dataDir + "Callback_out.pdf", options); |
以下是代码测试图页面保存回调自定义类。
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| // For complete examples and data files, please go to https://github.com/aspose-diagram/Aspose.Diagram-for-.NET | |
| public class TestDiagramPageSavingCallback : Aspose.Diagram.Saving.IPageSavingCallback | |
| { | |
| public void PageStartSaving(Aspose.Diagram.Saving.PageStartSavingArgs args) | |
| { | |
| Console.WriteLine("Start saving diagram page index {0} of pages {1}", args.PageIndex, args.PageCount); | |
| } | |
| public void PageEndSaving(Aspose.Diagram.Saving.PageEndSavingArgs args) | |
| { | |
| Console.WriteLine("End saving diagram 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
开始保存第 11 页的第 0 页索引
结束保存第 11 页的第 0 页索引
开始保存第 11 页的第 1 页索引
结束保存页面索引 1，共 11 页
开始保存第 11 页的第 2 页索引
结束保存第 11 页的第 2 页索引
开始保存第 11 页的第 3 页索引
结束保存第 11 页的第 3 页索引
开始保存第 11 页的第 4 页索引
结束保存页面索引 4，共 11 页
开始保存第 11 页的第 5 页索引
结束保存页面索引 5 of pages 11
开始保存第 11 页的第 6 页索引
结束保存页面索引 6 of pages 11
开始保存第 11 页的第 7 页索引
结束保存页面索引 7 of pages 11
开始保存第 11 页的第 8 页索引
结束保存页面索引 8，共 11 页