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所属分类：.NET技术
安装Openxml sdk
首先，我们先安装nuget的需要的有关的Openxml sdk，我们开源了解析pptx的Openxml拍平层，下面两种方式都可以安装：
- nuget包管理器控制台：
Install-Package dotnetCampus.DocumentFormat.OpenXml.Flatten -Version 2.0.0 - csproj引用：
<PackageReference Include="dotnetCampus.DocumentFormat.OpenXml.Flatten" Version="2.0.0" /> 解析Pptx
我这里用PPTX的7种直线，分别设置7种能够设置的虚线类型,PPTX的显示效果是这样的：
然后解析代码如下,解析主要逻辑部分：
private void PptxToGeometry(string filePath) { if (!File.Exists(filePath) || !filePath.EndsWith(".pptx", StringComparison.OrdinalIgnoreCase)) { return; } var lines = new List<Line>(); using var presentationDocument = PresentationDocument.Open(filePath, false); var presentationPart = presentationDocument.PresentationPart; var presentation = presentationPart?.Presentation; var slideIdList = presentation?.SlideIdList; if (slideIdList == null) { return; } foreach (var slideId in slideIdList.ChildElements.OfType<SlideId>()) { var slidePart = (SlidePart)presentationPart.GetPartById(slideId.RelationshipId); var slide = slidePart.Slide; foreach (var shapeProperties in slide.Descendants<ShapeProperties>()) { var presetGeometry = shapeProperties.GetFirstChild<PresetGeometry>(); if (presetGeometry != null && presetGeometry.Preset.HasValue) { if (presetGeometry.Preset == ShapeTypeValues.StraightConnector1) { var transform2D = shapeProperties.GetFirstChild<Transform2D>(); var extents = transform2D?.GetFirstChild<Extents>(); if (extents != null) { var width = new Emu(extents.Cx!.Value).ToPixel().Value; var height = new Emu(extents.Cy!.Value).ToPixel().Value; var presetDash = shapeProperties.GetFirstChild<Outline>()?.GetFirstChild<PresetDash>()?.Val; var dashArray = GetDashArrayByPresetLineDashValues(presetDash); var line = ConverterToGeometry( width, height, dashArray); lines.Add(line); } } } } } this.ListBox.ItemsSource = lines; } PPTX映射成WPF虚线的方法：
private DoubleCollection GetDashArrayByPresetLineDashValues(PresetLineDashValues presetLineDashValues) { DoubleCollection dashStyle = presetLineDashValues switch { PresetLineDashValues.Solid => new(), PresetLineDashValues.Dot => new() { 0, 2 }, PresetLineDashValues.Dash => new() { 3, 3 }, PresetLineDashValues.LargeDash => new() { 8, 3 }, PresetLineDashValues.DashDot => new() { 3, 3, 1, 3 }, PresetLineDashValues.LargeDashDot => new() { 7.5, 3.5, 1, 3.5 }, PresetLineDashValues.LargeDashDotDot => new() { 8, 3, 1, 3, 1, 3 }, PresetLineDashValues.SystemDash => new() { 3, 1 }, PresetLineDashValues.SystemDot => new() { 1, 1 }, PresetLineDashValues.SystemDashDot => new() { 2, 2, 0, 2 }, PresetLineDashValues.SystemDashDotDot => new() { 2, 2, 0, 2 }, _ => new DoubleCollection() }; return dashStyle; } 最终绘制线条的方法：
private Line ConverterToGeometry(double width, double height, DoubleCollection dashDoubleCollection) { var line = new Line { X1 = 0, Y1 = 0, X2 = width, Y2 = height, StrokeDashArray = dashDoubleCollection, Stroke = Stroke, StrokeThickness = StrokeThickness }; return line; } 最终的效果：
我们可以看到几乎是接近的效果了，当然你也可以根据我的代码去微调更精确的值，只需要稍微改下GetDashArrayByPresetLineDashValues方法内相对应的值即可
后话
实际上，openxml文档是给出了PresetDash的值的,大致如下:
但是其值跟WPF的设置Dash的DoubleCollection不对应，因此以上的映射值都是我自己微调的
源码
BlogCodeSample/PptDashConverToWpfSample at main · ZhengDaoWang/BlogCodeSample
