Create Classes To Represent One To Many Relationships In C#?
Jun 20, 2010
how to create C# classes to represent one to many relationships in C#. I have a Customer and an Address table in my database. I also have a Customer class in my C# solution but how do I introduce the multiple address element? Do I have a separate Address class? Do I create a subclass in the Customer class or create a method in Customer called GetAddresses of type List which contains all of the relevant logic? In my code I need to be able to return a customer with all associated addresses and I just cannot picture the best way to achieve this using OOP.
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Nov 19, 2010
I am having a problem mapping a many-to-one relationship from an abstract base class mapping to a concrete union-subclass. Example:
public abstract class Entity
{
public virtual Guid ID {get; set;}
public virtual string Name {get;set;}
public virtual User OwnerUser {get; set;}
}
public class User : Entity
{
public virtual string UserName {get; set;}
}
I have a base abstract class for all of my database objects. I am mapping these classes with the Entity class as the abstract mapping class and the User as a union-subclass. When creating the configuration object, no errors are thrown and the Schema exports just fine. However, the field to the OwnerUser just won't show up in the database for all of the concrete classes. Here is an example of how the mapping looks
<class entity-name="Entity" name="Entity" abstract="true">
<id name="ID" type="guid">
<generator class="guid.comb"/>
</id>
<property name="Name" />
<many-to-one name="OwnerUser" column="ID" entity-name="User" />........
I am also using an Oracle XE instance as the database backend. If this isn't enough information to properly answer the question, let me know and I will add what I can.
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Dec 21, 2010
i am working on a social networking project using MVC2 visual studio, currently i am working on these two tables , post & comment. Each post can have many comments.i have created a post controller along with the related view , and it work well , now i want to add under the post a comment view, where a post can have many comments , i can add the comments on different view , but i need to have a post and under it to add many comments, so how i can do so?
another problem is that in the post table there is a field representing a rating, now i can add in the rating field 1, 2,3,4,5,etc, but i need this field to be viewed as a list having values from 1-5?
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Jan 28, 2011
Just for an example, if I have three controls on a Master page, I would usually declare a variable for a control like this.
var elem = document.getElemntId('<%=control1.ClientID %>');
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var elem3 = document.getElemntId('<%=control3.ClientID %>');
Can I do it in some form of concenation like:
[code]....
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Sep 7, 2010
I have the following database, consisting of 3 tables: Job, JobPhase, Assigned (as seen in the following image)
[URL=http://img836.imageshack.us/i/87157705.jpg/][IMG]http://img836.imageshack.us/img836/8710/87157705.th.jpg[/IMG][/URL]
I'm trying to create a page that will hold a table. The table will represent, for a particular employee (ID = D_ID), his/her corresponding Job Schedule sheet.
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May 3, 2010
I have a table that contains item data. If the item is a particular type further information exists to describe the item. The additional information isn't that heavy however the number of records in relation to the main file will be quite small (less than
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So I have 2 scenarios:1) Put the additional data in the main table and take tha hit on storage
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Jul 23, 2013
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2 table enough or I need more table?
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Aug 5, 2010
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Nov 24, 2010
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Jan 7, 2011
Do I need to create the Models classes all the time ?
such as
[Code]....
I would like to use the classes straightly ,that is generated by Linq to sql?
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Dec 1, 2010
I am used to making separate Business Object and List<> classes for my DB tables. Sometimes I just have a basic task in hand as displaying a list of year for a search box or having some values in a drop down.
Right now I am ending up with a lot of separate classes and List classes<> for these basic operations.
How can I make a single class for some basic tasks as these by using generics? I want to have single class for some methods like get current year, employee names, Department Name/Code, Title etc. I am using .NET 2.0.
Edit
After some searching, I found that I can achieve similar tasks by creating a DTO namespace.
What I don't get right now is how to create multiple classes inside my DTO class. Say 1 class for just returning 'year', One for 'Employee Name/Code' and so on inside the single DTO class.
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Jul 9, 2010
Whenever I create a new folder in my website (VS008) and add an item (Class) it can't be seen by the other pages, even though new class is public. Only if I add the class to the app_code folder or create a bin folder for it then it could be shared from these folders however I want to create my own custom named folders for organization and keep my classes there.
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Jan 28, 2011
I am setting up my new project..We are using entity frame work 4.0..
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Itest.cs
Public Interface ITest
{
int testproperty {get;set:}
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public int testproperty {get;set:}
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Dec 23, 2010
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Nov 12, 2010
I want to create two partial classes for the single aspx file. I am using vs2005 dotnet 2.0. i could not able to access method from one partial class in another partial classes.
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public partial class _Default : System.Web.UI.Page
{[code]...
i could not able to access meth method in partial class 2
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Jan 11, 2010
I am new to LINQ. when we drag tables we get a dbml file and designer file.
For example DataClasses1.dbml and DataClasses1.designer.cs.
Once we have them then we can start using our LINQ Queries.
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May 17, 2010
I am following the Nerd Dinner tutorial as I'm learning ASP.NET MVC, and I am currently on Step 3: Building the Model. One part of this section discusses how to integrate validation and business rule logic with the model classes. All this makes perfect sense. However, in the case of this source code, the author only validates one class: Dinner.
What I am wondering is, say I have multiple classes that need validation (Dinner, Guest, etc). It doesn't seem smart to me to repeatedly write these two methods in the partial class:
[code]....
This doesn't "feel" right, but I wanted to check with SO to get opinions of individuals smarter than me on this. I also tested it out, and it seems that the partial keyword on the OnValidate method is causing problems (understandably so). This doesn't seem possible to fix (but I could very well be wrong).
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Aug 11, 2010
I don't know if this has to do with how FindControl works or how scope works. But my base class is having a hard time seeing the fields of child classes. Currently I'm planning have the derived class set a property in the base class, but there are a lot of derived classes, so that isn't a very attractive solution.
[code]....
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Mar 24, 2010
Can I use VB and C# classes together in the same asp.net 3.5 project?
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Dec 15, 2010
I'm curious as to what people consider better practice, between duplicating model structure in the view model and using a mapping tool to move data between the two, or aggregate the model inside the view model, i.e. have a property on the view model class that is a reference to the actual model. Which is considered a better approach in general?
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Mar 3, 2010
I'm a novice developer writing an ASP.NET application with VB. I'm having a little trouble getting my head around the partial class concept. If you use the partial classes as a code-behind for the presentation, how would these be represented in UML, in particular with a class diagram?
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Apr 19, 2010
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[Code]...
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Aug 5, 2010
What is the best approach to one to many relationships?
This is my scenario:
I have a simple one to many relation:
Customer
CustomerID
Name
tel
CustomerNotes
Id
Note
customerID
I want to have a DETAIL view of customers and CREATE view for CustomerNotes all in the same page.
I create CustomerController and the different views and its respective actions for edit, create, delete, etc.
I also create a CustomerNotesController and the views and actions like before, but I made the views PARTIALS
I put a RENDERPARTIAL for the CustomerNotes create view in the Details view from Customer.
When I run the app, the page is render as expected: It shows the detail info of the customer and bellow the create form for the notes. However, when I click SAVE, nothing happens. I put a breakpoint in the notes controller and never get hit.
I also try with RenderAction and don't work at all.
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Dec 21, 2010
If I have the following code:
TextBox txtUsername = new TextBox();
void setEnabled(string str, bool enable)
{
// use str to find the TextBox object
// str.Enabled = enable;
}
Is this kinda thing even possible? I want to be passing in 'Username' and then be prepending it with 'txt'.
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Feb 1, 2010
I'm having a hard time wrapping my head around how to use the Memberships in MVC. I know there is the built in ASPNETDB database which has all the basic tables for users and such. But what if I wanted to add a relationship between one of my custom tables and this built in user table?
If I had a database table that contained blog comments, we'll call it Comment. And each Comment had a userID associated with it could I do something like?
User.Comments.Add(someCommentObj)
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