WPF应用程序在每个系统规模上的大小相同（与规模无关）

问题描述

有没有办法使WPF应用程序在每个系统规模上都具有相同的大小？

Is there any way to make WPF application get same size at every system scale?

当我更改更改文本，应用程序和其他项目的大小在Windows系统设置中从全高清屏幕的 125％（推荐）到 100％，我的WPF应用程序变得太小。为了实现独立的系统规模的应用程序，我编写了这样的函数将应用程序的缩放比例更改回125％：

When I change Change size of text, apps and other items in windows system setting from 125% (Recommended) to 100% in a Full-HD screen, My WPF application gets too small. To implement independent system scale application I've wrote a function like this to change scaling of my app back to 125%:

private void ScaleTo125Percents()
{
    // Change scale of window content
    MainContainer.LayoutTransform = new ScaleTransform(1.25, 1.25, 0, 0);
    Width *= 1.25;
    Height *= 1.25;

    // Bring window center screen
    var screenHeight = System.Windows.SystemParameters.PrimaryScreenHeight;
    var screenWidth = System.Windows.SystemParameters.PrimaryScreenWidth;
    Top  = ( screenHeight - Height ) / 2;
    Left = ( screenWidth  - Width )  / 2;
}

但是有一些调用此函数的条件。屏幕的第一个必须为Full-HD（有API可以检查此内容），并且系统比例必须为100％（没有.NET API可以获取系统比例）。

But there are conditions to call this function. First of the screen must be Full-HD (There are APIs to check this) and also system scale must be 100% (There is no .NET API to get system scale).

我该怎么办？我是否正在执行使我的应用程序系统独立于规模的标准方法？

What can I do? Am I doing standard way to make my application system scale independent?

我见过的与规模无关的应用程序示例：

Example of scale independent applications I've seen:

• Visual Studio 2017安装程序


• 电报桌面

• Visual Studio 2017 Installer
• Telegram Desktop

推荐答案

终于找到了答案。首先使用以下选项之一获取系统DPI规模：

Finally found an answer. First get system DPI scale using one of the options below:

• 从注册表中读取 AppliedDPI 位于计算机\HKEY_CURRENT_USER\控制面板\桌面\WindowMetrics 中的dword。然后将其除以96。



• 或使用以下代码段：

• Read from registry AppliedDPI dword located in Computer\HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics. Then divide it by 96.

• Or use this snippet:

double dpiFactor = System.Windows.PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice.M11;

返回1.0到2.5之间的值

that returns a value between 1.0 to 2.5

然后创建一个保存应用程序设置的配置文件，并将dpiFactor设置为默认比例。如果用户喜欢自定义比例，请在窗口启动时调用此函数：

Then create a config file that holds application settings and set dpiFactor as default scale. If user preferred a custom scale, call this function on window startup:

private void UserInterfaceCustomScale(double customScale)
{
    // Change scale of window content
    MainContainer.LayoutTransform = new ScaleTransform(customScale, customScale, 0, 0);
    Width *= customScale;
    Height *= customScale;

    // Bring window center screen
    var screenHeight = System.Windows.SystemParameters.PrimaryScreenHeight;
    var screenWidth = System.Windows.SystemParameters.PrimaryScreenWidth;
    Top  = ( screenHeight - Height ) / 2;
    Left = ( screenWidth  - Width )  / 2;
}

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