Furthermore it was a good opportunity to develop an interesting web custom control and apply it in an application. User controls are an easy kind of custom controls. They can be created as simply as creating an ASP. NET web page, using the Visual Studio Toolbox for designing and the code behind for defining properties and methods for the control. Dig deeper: What is ASP. NET performs faster than any popular web framework in the independent TechEmpower benchmarks.
Data sourced from official tests available at TechEmpower Round NET supports industry standard authentication protocols. NET provides a built-in user database with support for multi-factor authentication and external authentication with Google, Twitter, and more. NET forums , and more. NET is open source on GitHub, with over , contributions and 3, companies already contributing.
Join the. NET community. You can also deploy to any major cloud platform, your own Linux or Windows servers, or one of many hosting providers. This looks really simple in theory, but it is a bit more complicated in practice. Because user agents have become a mess over time and are rather different from one browser to another and from one OS to another, ASP. NET uses a complex yet powerful mechanics to detect browsers. We have just listed above a few examples of user agents.
From this list, we could begin writing browser detection in pseudo-code in an imperative manner:. As a picture often speaks better than words, it is maybe clearer in the figure below. You can see that this code is pretty cumbersome and rather inelegant. What if we had to add a new browser or a new rule? What if a browser changed its user agent? NET comes to the rescue with browser files.
Browser files are a way to detect browsers, but instead of using a procedural view like the aforementioned code, they define hierarchical structures in a more natural fashion. You will find more details on browser files on the MSDN here. You can see from the above listing that user agents are rather different from browsers to browsers but they still follow a certain rationality.
For example:. We can derive from these remarks and the pseudo-code developed above a hierarchical structure of user agents see below. Browser files are just XML files that mimic this hierarchical structure as far as possible.
And thus:. These browser files give an overview of what they look like in practice. If you open one of these files chrome. We can see that there is a parentID tag filled with WebKit. This tag refers to another browser file generic. This file itself refers to another browser Mozilla and this schema continues until the root is reached until there is no more parentID tag in the browser file. This is how browser files translate into XML files the hierarchical structure described above.
At the same time, you will notice how a user agent is matched with the corresponding input via the identification tag and how this one can also take into account version of the browser with the use of regular expressions. Once this hierarchical structure is revealed, we can sum up how a browser is inferred by our ASP. We can then change the default behavior and correctly detect browsers. More on this later. We saw earlier that Edge was incorrectly detected as Chrome. So, how to correct this behavior?
As we said earlier, it is possible to add custom browser files to do it. To be more precise, we are just telling ASP. As we state that the parentID is Chrome, this operation is only completed if all the requirements for Chrome have already been fulfilled Mozilla, AppleWebKit, Chrome ,. And we could apply the same reasoning for the other browsers. For SeaMonkey - Add a seamonkey. For Maxthon - Add a maxthon. And so on for all other browsers and for those that will be released in the coming months.
Browser detection was a primary concern for us. That is the reason why we implemented the guidelines above. But in production, we quickly experimented a very strange and unpredictable phenomenon. What does this farce mean? Did this demo address your needs?
Thank you in advance for your cooperation. If you need immediate help, please submit a support ticket on the DevExpress Support Forum. We are here to help. The main features of the ASPxFileManager control are listed below along with the corresponding control settings : Show the folder and file structure Settings. RootFolder and Settings.
InitialFolder ; Automatically sort folders and files based on their names; Automatically generate and display thumbnails for image files Settings.
ThumbnailFolder and Settings. ThumbnailSize ; Rename, move, copy and delete files and folders SettingsEditing. AllowRename , SettingsEditing.
AllowMove , SettingsEditing. AllowCopy and SettingsEditing. AllowDelete ; Create new folders SettingsEditing.
AllowCreate ; Download a selected file SettingsEditing.
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