ASP.NET 65 ASP.NET/Core/MVC


Migrating Old ASP.NET Applications to .NET Core

More and more people are talking about .NET Core these days. It is true that .NET Core is the future, and .NET Framework will still be maintained because very large number of applications can’t be migrated in a short time. .NET Core and .NET Framework are just like electric cars and gasoline powered cars. Gasoline cars is mature, and you can drive it without any problem, but electric cars h...

ASP.NET .NET Core .NET Framework

Generate Captcha Code in ASP.NET Core

If you want to use captcha code to protect your website from spam messages, there are a few options such as Google ReCaptcha and captcha.com. Both of them can be integrated into ASP.NET Core applications. However, you may still want to generate the captcha code yourself for some reason, such as your website may be used in mainland China... This post will show you how to generate and use captcha co...

ASP.NET .NET Core

Add Watermark to Uploaded Image in ASP.NET Core

Adding watermark to an image is very widely used in websites in order to protect the content owner's copyright, such as a blog system like this website. In triditional ASP.NET (.NET Framework), we could use System.Web.Helpers.WebImage to add text watermark like this: var image = new WebImage(imageBytes); image.AddTextWatermark( Settings.Instance.WatermarkText, "White", Settings.Instance.Wat...

ASP.NET .NET Core

Send AntiForgeryToken via jQuery Ajax in ASP.NET Core

In ASP.NET Core, if we use jQuery Ajax to post data to the server, and we want the ValidateAntiForgeryToken attribute to work. We have to do some tricks. The official document didn't document how to do it via jQuery. Let me show you how to do it. Please do read the official document first: https://docs.microsoft.com/en-us/aspnet/core/security/anti-request-forgery?view=aspnetcore-2.1  In my pract...

AJAX ASP.NET jQuery .NET Core

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 ima...

ASP.NET IIS .NET Core

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...

.NET Core NLog

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;...

ASP.NET .NET Core

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 s...

ASP.NET .NET Core

Azure Website部署的网站woff字体在IE下404的问题

如果你的网站用了Microsoft Azure的Website服务(改名部门已经改成了Web Apps),那么你会发现woff格式的webfont在IE下是爆掉的,请求回来是404。 根据经验,这应该是IIS没有配置对应的MimeType引起的。然而Azure上的IIS对我们来说是不可操作的,不能够远程桌面到服务器上去改设置,肿么办? 其实在IIS7以后,MineType的配置是可以通过web.config管理的。所以我们只要在web.config/system.webServer节点里面加上这段代码就可以让IIS处理woff的请求了: BTW,最快的在Azure上做即时生效的更改的方法,可以通过VS的Server Explorer连接到Azure,展开你的网站,找到web.config,你的更改可以直接保存到azure上,不用专门再做一次部署了:...

IIS Azure webfont

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["EnableA...

config