18
SEP
Microsoft MVP for Azure
.NET C# Programming Language and .NET Platform
18
SEP
Prevent Image Hotlinking in ASP.NET/Core Applications
Introduction As a website developer, we sometimes don't want the images on our own website to be directly referenced and showed on other's website. It can cause a lot network bandwidth for our datacenters in some cases, which means costing money for us to pay for the one who use our images. For example, your website is A.com, you have an image on http://a.com/facepalm.jpg and B.com used your …
05
NOV
Use ICMP Ping in .NET Core 2.0
In classic .NET Framework applications, we have used System.Net.NetworkInformation.Ping class to Ping a host address. This API is not included by default in .NET Core, even in version 2.0. Here is how to do it in a .NET Core way. First, we need to reference a package System.Net.Ping Install-Package System.Net.Ping This will give us the same API set as .NET Framework. Then, in your .NET Core code, …
31
OCT
Use NLog in ASP.NET Core 2.0
There's official update for NLog targeting ASP.NET Core 2.x, for the latest methods please refer to https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-2 Recently I am porting a classic ASP.NET MVC 5 project to .NET Core 2.0, in order to run it on Linux. One of the parts that has differences between .NET Fx and .NET Core is logging. I choose NLog as my logging providor, let's …
15
OCT
Get Client IP Address in ASP.NET Core 2.x
In classic ASP.NET we used to get client IP Address by Request.UserHostAddress. But this does not apply to ASP.NET Core 2.0. We need a different way to retrieve HTTP Request information. 1. Define a variable in your MVC controller private IHttpContextAccessor _accessor; 2. DI into the controller's constructor public SomeController(IHttpContextAccessor accessor) { _accessor = accessor; …
24
JUL
Windows 10 UWP: Undo / Redo on InkCanvas
The InkCanvas in UWP only got pens by default, it can not perform Undo or Redo. To implement this, we will need to code for ourselves. Official document covered Undo functionalilty, but not redo. Today, I have successfully done it, and I'd like to share with you. First, you need to add two custom buttons on the InkToolbar for Undo / Redo 1. Undo the Ink We need a few APIs. To …
09
OCT
Read AppSettings in ASP.NET Core 2.x
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 Classic ASP.NET Code web.config Controller private static CloudBlobContainer GetBlobContainer() …
19
MAY
Azure Website Showing 404 for .woff Fonts in IE
If you are using Website on Microsoft Azure (Currently renamed to Web Apps), you will find the .woff web font is not working in IE, it returns 404. Based on my experience, this is because IIS is not configured to use the correct MimeType. However, we can not operate the IIS on Azure, there's no RDP into an Azure Web Apps backend machine. How can we do that? In fact, after IIS7, the MineType is …
22
APR
如何高逼格读取Web.config中的AppSettings
先插句题外话，下版本的ASP.NET貌似把web.config撸掉了，都变成json了。所以本文讨论的内容可能以后用不到了，但是一些设计思想还是可以用的~ 直接进入正题，在ASP.NET网站里（也包括其他有web.config, app.config）的.NET工程里，读AppSettings的值是个很常见的场景。比如： 在代码里读的时候就会用到： ConfigurationManager.AppSettings["EnableAzureWebTrace"]; 这个[]索引器返回的是string类型。所以下一步我们通常需要类型转换才能在代码里拿来用。比如这个例子里，我们就要转换成bool。其他时候，可能要转换为int等类型。 string enableAzureWebTraceConfig = ConfigurationManager.AppSettings[" …
20
JUL