在 .NET Framework 4.6.2 中，FormattedText() 已过时，我该如何修复它 [英] In .NET Framework 4.6.2 the FormattedText() is Obsoleted, how can I fix it

问题描述

当我尝试使用 .net framework 4.6.2 构建 WPF 项目时，出现错误，因为 FormattedText() 已过时，如下所示:[过时(使用 PixelsPerDip 覆盖"，false)]public FormattedText(string textToFormat, CultureInfoculture, FlowDirection flowDirection, Typeface typeface, double emSize, Brush foreground);

When I try to build the WPF project with .net framework 4.6.2, I got an error, Because the FormattedText() is Obsoleted as below: [Obsolete("Use the PixelsPerDip override", false)] public FormattedText(string textToFormat, CultureInfo culture, FlowDirection flowDirection, Typeface typeface, double emSize, Brush foreground);

新的覆盖方法是public FormattedText(string textToFormat, CultureInfo culture, FlowDirection flowDirection, Typeface typeface, double emSize, Brush foreground, double pixelPerDip);

问:如何确定pixelsPerDip?

Q: How can I determine the pixelsPerDip ?

问:我如何在没有 pixelPerDip 的情况下使用旧的构造函数?，因为 pixelPerDip 对我的项目没用.

Q: How can I use old constructor without pixelsPerDip?, because the pixelsPerDip is useless for my project.

推荐答案

你需要计算你的显示器的 DPI，见:如何在 WPF 中获取 DPI?

You need to calculate the DPI of your monitor, see: How can I get the DPI in WPF?

此外，.Net 4.6.2 带来了处理 DPI 感知的新 API，因此上述方法可能会被弃用(例如 VisualTreeHelper.GetDpi()).请参阅 https://blogs.msdn.microsoft.com/dotnet/2016/08/02/annoucing-net-framework-4-6-2/这是一些示例代码和用户指南:https://github.com/Microsoft/WPF-Samples/tree/master/PerMonitorDPI

In Addition, with .Net 4.6.2 come new APIs to handle the DPI awareness, so the above methods might be deprecated (e.g. VisualTreeHelper.GetDpi()). See https://blogs.msdn.microsoft.com/dotnet/2016/08/02/announcing-net-framework-4-6-2/ Here is some example code and a Userguide: https://github.com/Microsoft/WPF-Samples/tree/master/PerMonitorDPI

恕我直言，已添加此参数，以便您的程序可以在具有不同 DPI 的显示器之间拖动，并且仍然可以正确缩放.

IMHO this pararameter has been added so that your program can be dragged between monitors with different DPIs and still is scaled correctly.

来自 FromattedText 声明:pixelsPerDip:

From FromattedText declaration: pixelsPerDip:

Pixels Per Density Independent Pixel 值，即相当于比例因子.例如，如果屏幕的 DPI 为120(或 1.25，因为 120/96 = 1.25)，每个密度 1.25 像素绘制独立像素.DIP 是 WPF 使用的度量单位独立于设备分辨率和 DPI.

The Pixels Per Density Independent Pixel value, which is the equivalent of the scale factor. For example, if the DPI of a screen is 120 (or 1.25 because 120/96 = 1.25) , 1.25 pixel per density independent pixel is drawn. DIP is the unit of measurement used by WPF to be independent of device resolution and DPIs.

如果您只有 1 个监视器，因此不需要任何 DPI 更改的事件处理，请在您的 Window(或您的构造函数)的 OnLoaded() 事件中使用以下示例:

If you just have 1 monitor and therefore don't need any DPI changed event handling, use the following for example in the OnLoaded() event of your Window (or in your constructor):

var pixelsPerDip =  VisualTreeHelper.GetDpi(this).PixelsPerDip;

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