Domain Driven Programming And Events?
Dec 5, 2010
I'm doing some asp.net mvc coding using DDD. I have objects representing the business entities and service repositories that handle fetching and adding them. I'm new to this and as my application grows I begin to see a lot of secondary code that must run as a result of adding, deleting or changing my domain objects/data.
I'd like to make an event driven system where one action triggers other parts of code to run. For instance when I delete a user I want to be able to subscribe a number of other things to this action so they all are run when a delete takes place.
How have you coded your applications to handle these situations? How can I establish a reliable and coherent OO system for my problem? I already know about events and delegates but I'm more interested in coding techniques and nice practices.
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Dec 27, 2010
My task for today is to fully understand event-driven programming and how it works. Now there are several ways this can be achieved. The first one is to actually program a basic program that covers the key concepts, and the second approach is to watch a video that explains the key concepts in a way I can understand. Which approach do people recommend?
Does anyone have videos/program demos they found useful and could recommend to me? My major experiences are with ASP.NET MVC, so it would be best if the tutorial were with WebForms ASP.NET.
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Mar 9, 2011
Assuming my application did not warrant a full blown DDD setup, would Repositories still be useful? I like the way they shield from implementation details (such as use of Entity Framework) underneath. However Repositories tend to be tied to Aggregate Roots (the concept is still a holy grail to me) by definition.
I suppose the question could also be put as such: if I have a typical 3-tier application, with a business layer facade consisting of "logical grouping" classes based on functionality (rather than aggregate roots as in DDD) such as TradingManager and ContactsManager, would it make sense to also create "logical grouping" repositories. Or perhaps a Data Access Object, which I believe is like a Repository without the aggregate root requirement. Of course I will still have a Model (EF POCOs) that will be passed up and down between the layers.
Also, is what I just described would be considered as a Transaction Script approach? It's certainly not DDD, and not Active Record. I'm not even sure if Active Record exists with EF4 like it does with Nhibernate.
I am trying to understand how others structure n-layered applications when they do not follow DDD.
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Aug 7, 2010
I want to know what is the advantages of using aggregates in c# for design patterns.
suppose i have tree tables
Member(M_Id,M_Info)
Bid(B_Id,B_Info,M_Id,Item_Id)
Item(Item_Id,Item_Info)
"One member can place more than one bid on more than one item."
so there is one to many bidirectional association between Bid and Member table.
And one to many association between bid and item table Now According to defination of aggregates in this case Item table is the root of aggregate item and item has aggregation with bid table.
and bid table holds unidirectional reference to member table and hence only bid table has access over member table.
But ultimately this will also map in database same as without using aggregate then what is use of aggregates?
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Oct 8, 2010
How can you obtain the 'mydomain.com' part of a url within Application_End?
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Mar 16, 2011
but I am rather confused about what to invest in. I heard that server-side code translates into client-side code. So, if you have an .aspx file, it will be converted to HTML/CSS/JavaScript. I have experience with the latter three technologies put into a rather dull text file and rendered by a web browser. My question is how much HTML/CSS/Javascript coding would I have to do when server-side programming? In other words, can someone using ASP.NET program purely on the server side and not bother to write for the client side? Of course, I don't care about server-side being translated into client-side, but I am wondering if client-side programming needs to be done explicitly and to what degree.
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Apr 9, 2010
I've googled a bit for the exact order of all gridview events relative to and where inbetween page events. The only Microsoft article: [URL] is not very clear. I'm especially interested in the gridview row_command event relative to page events.
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Jan 8, 2010
So I've got a databound grid view within a UpdatePanel.
the user can change the data within the gridview then click a save button to update the data within the database.
However in order to know which rows have been changed I have a textChanged event associated with each textbox, but the event isn't being fired.
Here's the ASP code:
[code]....
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May 2, 2010
i just want to use a calendar with events like date selection update,delete,creat events. and i want to do this with sql server 2005. I started my project with webApple.
and the secound, i just cand find whats wrong in this
[Code]....
the problem line is
[Code]....
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Jan 11, 2010
I have been tasked with designing a scheduling system to fit into an existing application. At present I have a SQL Table - Tasks which have a StartDate and EndDate column.
I have a requirement to set the Task as a recurring task i.e. Replace server backup tapes every day, or, Order more stationary once a month.
I am lost on how to design this. I can't seem to find a proper example on the net. can someone point me in the right direction.
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Feb 17, 2011
I have also installed SSL on a subdomain. I have put payment page under this sub domain.
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Sep 28, 2010
My feeling says it's not posible but anyway I am curious if there is at least a workaround for accomplish this.Basically I am working at my client site and my machine is not connected to the domain.What I want to do is running a web application locally under a domain account, and using the webdev server.The webapp uses the default authentication, windows authentication that is.I tried using impersonation with domainuser & password but I got the following error Could not create Windows user token from the credentials specified in the config file. Error from the operating system 'Logon failure: unknown user name or bad password.I have to mention that the username and the password are correct.
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Aug 3, 2010
We have a ASP.NET site that partially depends on forms authentication for login credentials, however the implementation of IPrincipal is completely custom.
But, when running the site on a particular server (which is somewhat semi-hardened when it comes to security), the app crashes when invoking IPrincipal.IsInRole() with the following messsage:
System.SystemException: The trust relationship between the primary domain and the trusted domain failed.
This indicates a communication error between the web-server and the DC, however since our application doesn't at all utilizes Windows authentication, I don't see why it needs to communicate with the DC.
This is my implementation:
[code]...
EDIT:
I was finally enable to reproduce this error on my dev-machine (i revoked my machine from the DC yesterday, but didn't reproduce it until today)
HttpContext.User is actually a WindowsPrincipal by default it seems, and the error in my code was that I only replace it with CustomPrincipal upon login. Hence, unathenticated users still get the WindowsPrincipal which then fails horribly if you have trust issues on your AD.
I tried changing the default principal by invoking this on appstart
AppDomain.CurrentDomain.SetPrincipalPolicy( PrincipalPolicy.NoPrincipal);
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Aug 16, 2010
Im returning the username from sharepoint site as a string. This is done successfully with the below code but I also get the domain with it. How can I only return the username and not the domain either through sharepoint or programmatically removing it? domain/username
[Code]....
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Oct 19, 2010
I have a page with 2 Controls, a ListBox and a DropDownList.
In the DropDownList you can select a PLACE.
In the ListBox you can see all DOCUMENTS for the selected PLACE.
If you select a DOCUMENT, the program does a redirect on the selected DOCUMENT.
So, there are an AutoPostBack and an Event (if you select another Item) on both Controls.
The problem is: If I select a PLACE, then I select a DOCUMENT (the pdf document is opened), and then I go back on the page and I want to select another PLACE, the program doesn't select another PLACE, but opens the old DOCUMENT, because there are 2 Events, one to change the PLACE and one to open the DOCUMENTS.
Can I give a priority at the Events?
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Sep 28, 2010
My feeling says it's not posible but anyway I am curious if there is at least a workaround for accomplish this.Basically I am working at my client site and my machine is not connected to the domain.What I want to do is running a web application locally under a domain account, and using the webdev server.The webapp uses the default authentication, windows authentication that is.I tried using impersonation with domainuser & password but I got the following error Could not create Windows user token from the credentials specified in the config file. Error from the operating system 'Logon failure: unknown user name or bad password.I have to mention that the username and the password are correct.
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Jul 28, 2010
I have two domain servers X and Y.My Asp.net Web application is hosted on Domain X.But my scope is required to authorize the user of Domain Y on the Web application hosted on Domain X server.I am using Windows Authetication mode in application
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Jul 28, 2010
I have a main domain "mydomain.com" and then a sub domain "forums.mydomain.com". If a user visits "forums.mydomain.com" without being logged in, they are redirected to "mydomain.com/login.aspx".
The two scenarios are:
If they are redirected to the login page with "mydomain.com/login.aspx?ReturnUrl=http://forums.mydomain.com", then they are succesfully logged into the forums but NOT the main site.
If they are simply redirected to the login page with "mydomain.com/login.aspx" with no returnUrl, they are correctly logged into both the main site and the forums.
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Jul 23, 2010
I have a domain: http://www.mydomain.com. This domain is redirected to http://mydomain.anotherDomain.com.
I user forms authorization, so when the user navigates to Default.aspx he is redirected to Login.aspx. Pretty standard stuff.
On FireFox the user can log in on both on http://www.mydomain.com and http://mydomain.anotherDomain.com.
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Can it have anything to do with that on http://www.mydomain.com I can't see the filename ('Default.aspx', 'Login.aspx')? How can I enable so the filename is included in the redirected domain?
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Jan 27, 2011
I have an intranet web application. There are 2 user groups, group A belongs to the domain and group B does not. If I set the IIS to enable anonymous access, Request.ServerVariables("LOGON_USER") always return nothing. If I disable anonymous access and set Integrated Windows authenication, a Windows login prompt will come up if group B's users want to access the website.
How can I setup IIS so that when domain user access the website, it will direct to the main page with Session("user_name") = Request.ServerVariables("LOGON_USER"). If a user is not a domain user, the website will direct him/her to a login.aspx instead of having the Windows authenication prompt, then set Session("user_name") = txtUserName.Text, and finally redirect to the website main page ?
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Oct 13, 2010
is it possible to remove Main Domain cookie from Sub Domain ?I am using single sign on .On logout i want to remove the maindomain cookie
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Apr 12, 2010
We have a website for our company on one domain and we have a login form to a webmail solution on another domain.Now i would like to build a form on our website the transfers the request to the login form on the webmail domain and automatically validate the user if user and pass are correct.Need help to find the correct way of doing this. The domains is hosted by our company, the website and webmail is on different servers. I don't want to use the querystring,
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Aug 30, 2010
The following code works as it was originally designed to move a file from one directory to another directory on the same server, but I need to change it to work so it will move a file from one server to another server. My challenge is how to define the source directory on a different server and check if file exists.
Code behind:
Protected Sub btnSubmit_Click(ByVal sender
As Object, ByVal e As System.EventArgs)
Handles btnSubmit.Click
[Code]....
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Nov 25, 2010
Sample web application code where content(like forms) is generated based on user role like admin,priority1 user,priority2 user.
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Apr 6, 2010
Just I started learning MVC pattern, of course i am learning it from Microsoft's website.Just i want to gather quiz information from the experts. My understanding is (correct me then and there)
1 ) MVC does not support server side events, but supports client side events. If it supports client side events, I need html page with jQuery/Javascript (view), but most of the example I absorbed is to display the information(model) in view, I did not see any client side event handling happens in view.
2) Except ViewState and controlState, MVC supports Sessions, Application State management, Cache management.
3) When request goes to MVC engine, the routing module routes the request that is picked up by the controller. The controller in executes the appropriate action and returns the appropriate view.
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