Edi Wang

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Read AppSettings in ASP.NET Core

Today, I was rewriting an old ASP.NET MVC5 Demo project to ASP.NET Core, and found that the way we used to read Web.config by ConfigurationManager.AppSettings[] is no longer working. .NET Core has many new ways to achieve this. I picked one that suitable for my project. Here is how I do it. The old ASP.NET code: web.config ... ... ... ... Controller: private stat...

ASP.NET .NET Core

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 : List { const string GlobeGroupKey = "?"; public string Key...

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 Wi...

Windows 10 UWP

Raspberry Pi Surveillance Camera with Linux and Azure

Because Windows 10 IoT Core is not supporting Pi Camera, I can only use Linux instead. These days, I made a surveillance camera, the functionality is simple, when a person passed by the camera, it will take a picture and upload to Microsoft Azure Storage. It also got a website to remotely view the photos. 1. Hardware A PIR Sensor, a Pi Camera, a couple of jump wires. Connect the Singal port of t...

Azure IoT Raspberry Pi Linux Pi Camera Python

Uploading PiCamera images to Azure

Recently Windows 10 IoT Core Build 14393 is coming, but still without PiCamera support, WTF. So I can only choose Linux for my project. When I was using Windows, I use C# + Azure SDK to upload photos to Microsoft Azure. So how to do it on Linux? After some research, here's how to do it. My system is Raspbian Linux. First, we need to install Azure SDK in SSH Terminal: sudo pip install --pre azur...

Azure Linux Pi Camera Python

Raspberry Pi 3 and Windows 10 IoT Core Basics

最近有时间,总结了一下关于树莓派3及Windows 10 IoT的基础知识。适合没有接触过硬件但有一定编程经验的读者入门。我自己刚刚买树莓派的时候花了很长时间入门,搞清楚各种概念和属于。很多网上的帖子都是分散在各个角落的,并且是英文的,有些还是过时的,有些是爆的,所以我觉得有必要总结一篇基础入门帖子。这篇文章讲的都是抛砖引玉的概念,并不包括End-To-End的Case,想要做一个完整实验的文章,请看我博客的物联网开发系列文章:http://edi.wang/category/list/iot  如果有错误和补充,欢迎在评论里指出。 一、树莓派3 树莓派是基于ARM芯片的卡片电脑,大小和一张信用卡一样。今年推出了第三代,集成了板载蓝牙和WIFI。之前的树莓派1和2都是需要用USB WIFI和蓝牙实现的,所以你要是购买树莓派,买3是最方便的,可以省去USB WIFI和蓝牙的配件。并且W...

IoT Raspberry Pi

How to use Windows RDP to connect Raspbian Linux

Because Windows 10 IoT Core is not yet ready to replace Raspbian, in some case, we have to use Linux. The remote operation on Linux is usually done by SSH. If you want remote desktop like the one on Windows. There are two options: tightvnc or xrdp. I used to  use tightvnc, it does not have any problem with daily use. But I have to install a tightvnc client on my PC. However, XRDP can be supported...

IoT Raspberry Pi Raspbian Linux xrdp

Windows 10 IoT: How to Drive an SSD1306 I2C Display

I bought a 128x64 0.96 inch OLED display, like this one: The driver chip for this screen is called SSD 1306, typically, this chip will have 2 layouts, SPI or I2C. However, the examples fo how to drive I2C with SSD 1306 is very rare, and they run on Raspbian not Windows. Luckly, with the help from a Microsoft Staff in US, we finally got the code to run the screen on Windows 10 IoT Core. 1. Phys...

IoT Raspberry Pi SSD 1306 I2C

315MHz Remote Door Control by Windows 10 IoT

这几天我用树莓派实现了一个模仿车库遥控门的设备,分享给大家。(优酷视频 http://v.youku.com/v_show/id_XMTU3ODk1NDY2OA==.html )   一、遥控模块 首先介绍一下我用的遥控器和接收板,这种遥控模块在中国随处可以买到,基本都是长这样的。很多卷帘门、车库门都是用这种遥控模块的。做无线电实验购买的是非锁的版本,注意最好同时购买天线。天线用的是50欧姆单芯导线,其实就是个铜丝,注意购买时候要看好频率,中国大陆的无线电许可频率是315MHz,国外也有用443MHz的,我买的遥控器是315MHz。注意遥控器发射频率和接收频率要匹配就行。遥控接收端芯片是PT2272-M4,M4的意思是点动模式,即按住遥控器按钮输出高电平,松开停止输出。遥控板的ANT端焊接天线,方向要是竖直向上的(相对你的设备)。 遥控板的接口有7个: 接口...

Windows 10 IoT Raspberry Pi

Reed Controlled Light by Windows 10 IoT Core

Reed switch is an electronic component to connect / disconnect the switch by magnetic field. When it touchs magnetic field, the two iron sheets inside the tube will clip together, so the switch is connected.  The application of Reed Swith: Door light controller: When you open the door, turn the light on. When you close the door, turn off the light. This is simply install a reed switch on your do...

Windows 10 IoT Raspberry Pi