Edi Wang

Azure Developer, Microsoft MVP


Create QR Code in Windows 10 UWP

A year ago, I wrote an UWP application that can generate QR Code. However, at that time, the QR Code library I used was ZXing.Net, the last update for this package was in 2014. Now, time has changed, the author of ZXing.Net seems not to update the package any more. However, we have to move on, so I found a fantastic new library to generate QR Code in .NET applications: QRCoder To use that package, …


Get system font and characters in Windows 10 UWP

There used to be a {x:Static Fonts.SystemFontFamilies} in WPF that can bind to system font list very easy. However, this is gong in UWP! How stupid it is! These days I wrote a character map UWP application, that would use system fonts, so I did some research. In order to get system font in UWP, we must use DirectX. Install these 3 NuGet pacakges into your project: "SharpDX": "3.0.1", " …

Windows 10 UWP DirectX

How to Remove ListView Default Selection in Windows 10 UWP

A lot of people including me has encounter a problem where on UWP apps, if a ListView control is being data binded, it will get a default selected item like this: It not only will display as selected item, it also fires SelectionChanged event. However, if we want to make ListView clickable, a popular way is to write the SelectionChanged event handler like this: private void StationsList_ …

Windows 10 UWP

How to make a modal progress dialog in Windows 10 UWP

Windows 10 Mobile上的文件管理器有这样一个进度指示器,它是一个模态框,不带任何按钮,只有进度条和文本: 今天我琢磨了很久,绕了一些弯路,发现其实要做一个这样的模态进度指示器很简单。只要用ContentDialog就行。 平时我们用ContentDialog有些思维定势,就觉得这个对话框一定要提供按钮给用户操作。其实它是可以不设置任何按钮的,这样就有了初步的雏形: XAML C# private async void BtnSitAndRelax_OnClick(object sender, RoutedEventArgs e) { // show progress await ModalProgressDig.ShowAsync(); } …

Windows 10 UWP

Windows 10 UWP开发:拼音首字母分组如何去掉“拼音”前缀并支持切换系统语言

Windows 10里面有个脑残设计,就是系统默认的CharacterGroupings类型在中文版系统上会产生除了A-Z字母以外的带“拼音”前缀的另外24个分组。比如开屎菜单里就是这样: 如果我们用这个CharacterGroupings类型去创建带分组的ListView,就会变成这样: 更蛋疼的是,如果用户的系统是英文语言的,他就会发现分组变成空白了,没有任何数据。用户不知道这是微软干的,又得给我们的APP打1星,还要骂我们傻逼。 今天经过研究,终于把这个问题给解决了,不仅去掉了“拼音”前缀,也不用担心用户系统是什么语言的,都能正常显示分组列表。 我们先看看原来的代码。 public class AlphaKeyGroup<T> : List<T> { const string GlobeGroupKey = "?"; …

Windows 10 UWP

Sharing Images in Windows 10 UWP

Starting from Windows 8, one big feature for Windows Store Apps is to share data using Charm Bar across Apps. Although the Charm Bar is removed in Windows 10, but the API for sharing is still in the fight.  For example, in my "Image Portray" App, I can share ink to OneNote or Outlook. Today, I added same capability for my "Shanghai Metro" App. Here's how to do it. First, to share data across …

Windows 10 UWP

Sound Controlled Light by Windows 10 IoT Core

In many buildings, there are sound controlled light in use. When you clap your hands, the light turns on. Now, with Raspberry Pi 3 and Windows 10 IoT, we can make a sound controlled light ourselves. The sound sensor I use is FC-04. As other sensors, the first step is calibration. 1. Calibration for FC-04 Sound Sensor In quiet environment. Connect VCC to DC 3.3V,GND to Ground. At that time, the …

Windows 10 UWP IoT Raspberry Pi

Windows 10 IoT开发:HC-04超声波传感器测距(树莓派3)

HC-04是树莓派上用的比较广泛的超声波传感器,可以用来测量设备和物体之间的距离。可惜网上的资料很少有针对Windows 10的,几乎都是Python和C在Linux上的例子。 hackster.io上有一篇用HC-04做雷达的例子,但是设计的部件太多了,对单纯学习HC-04传感器的使用来说这个例子比较复杂。搜了一圈,英文资料最好的是这篇:http://www.guruumeditation.net/en/digital-io-with-windows-10-iot-raspberry-pi-2-and-the-ultrasonic-ranging-module-hc-sr04/ 国内中文资料介绍Windows 10上HC-04传感器的文章似乎还没有,所以就简单总结一下步骤。 一、物理连接 对于没有多少物理和电子知识基础的人(比如我)来说,第一步连线是比较难的。很多文章都一笔带过说“这很 …

Windows 10 UWP IoT Raspberry Pi

GY-30 (BH1750FVI) Light Sensor with Windows 10 IoT

I purchased a GY-30 light sensor recently, this model is also known as "BH1550FVI". There seems no sample for this sensor on Windows 10 yet, so I tried to make one. The light sensor looks like this: My board is a Raspberry Pi 3, the GPIO layout is shown in this table: Because GY-30 is an I2C device, so we can not use GPIO to drive it directly, we must use the I2C ports. In addition, …

Windows 10 UWP IoT Raspberry Pi