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  • Entity Framework 4 POCO with Dictionary

    - by Eric J.
    I have a POCO (Plain Old CLR Object) public Foo { public virtual int Id { get; set; } public virtual Dictionary<string, string> Stuff { get; set; } public virtual string More { get; set; } } Using the model first approach (i.e. I don't have a data model yet), how would I handle persisting Stuff (Dictionary)?

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  • how to learn a library/framework structure?

    - by fayer
    a lot of people are contributing to open source libraries/frameworks. i wonder how these people learn the structure so that they can contribute? lets take doctrine and symfony as an example. is there a blueprint over these frameworks to give the developers an insight of the structure? or do they just download it and study the code? how does it work? please you contributors, share your learning strategies! thanks

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  • compact framework windows CE using ExtEscape to control the brightness

    - by mack369
    I need to be able to control brightness of my Windows CE 5.0 device. I've found that there is an API function ExtEscape to do that ( http://msdn.microsoft.com/en-us/library/aa453063 ) but it needs a structure ContrastCmdInputParm (http://msdn.microsoft.com/en-us/library/Aa447689 ) as a parameter. Since ExtEscape is unmanaged, I cannot pass a .net structure. What is the simplest way to call this function?

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  • Entity framework with Linq to Entities performance

    - by mare
    If I have a static method like this public static string GetTicClassificationTitle(string classI, string classII, string classIII) { using (TicDatabaseEntities ticdb = new TicDatabaseEntities()) { var result = from classes in ticdb.Classifications where classes.ClassI == classI where classes.ClassII == classII where classes.ClassIII == classIII select classes.Description; return result.FirstOrDefault(); } } and use this method in various places in foreach loops or just plain calling it numerous times, does it create and open new connection every time? If so, how can I tackle this? Should I cache the results somewhere, like in this case, I would cache the entire Classifications table in Memory Cache? And then do queries vs this cached object? Or should I make TicDatabaseEntities variable static and initialize it at class level? Should my class be static if it contains only static methods? Because right now it is not.. Also I've noticed that if I return result.First() instead of FirstOrDefault() and the query does not find a match, it will issue an exception (with FirstOrDefault() there is no exception, it returns null). Thank you for clarification.

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  • multiple join query in entity framework

    - by gvLearner
    I have following tables tasks id | name | proj_id 1 | task1 | 1 2 | task2 | 1 3 | task3 | 1 projects id | name 1 | sample proj1 2 | demo project budget_versions id | version_name| proj_id 1 | 50 | 1 budgets id | cost | budget_version_id | task_id 1 | 3000 | 1 | 2 2 | 5000 | 1 | 1 I need to join these tables to get a result as below task_id | task_name | project_id | budget_version | budget_id | cost 1 | task1 | 1 | 1 | 2 |5000 2 | task2 | 1 | 1 | 1 |3000 3 | task3 | 1 | NULL | NULL |NULL select tsk.id,tsk.name, tsk.project_id, bgtver.id, bgt.id, bgt.cost from TASK tsk left outer join BUDGET_VERSIONS bgtver on tsk.project_id= bgtver.project_id left outer join BUDGETS bgt on bgtver.id = bgt.budget_version_id and tsk.id = bgt.task_id where bgtver.id = 1

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  • .NET compact framework - where to put files so that they are accessible to emulator

    - by dominolog
    Hello I have a .NET CF project. In the project directory I put a simple xml file (users.xml) which has to be read by the device. When I debug the application on device emulator and try to load the file from code, the Exception is thrown (FileNotFoundException "Could not find file '\users.xml'."). Is there a mechanism to automatically deploy also configuration files to a device emulator?

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  • Limit child rows in Entity Framework Query

    - by Jim
    Hi, If I have a parent and child modelled relationship. How to I select the parent, and some of the child rows. I cannot seem to do it, and load the parent object. var query = ( from parent in Parents.Include("Children") from child in parent.Children where child.Date == parent.Children.Max(x => x.Date) select parent); the problem is that the parent is returned multiple times, not the parent with the children loaded. Is there any way to populate each of the parents, and include the child rows, but only the ones needed. If I try and navigate again, I get all the children, not just the ones with the latest date. Thanks

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  • .NET Compact Framework Connection String encryption/securing

    - by Crazydog
    I'm writing an application in C# for a smart device running Windows Mobile 6.1. It's pretty basic. Just querying a database and getting results. Nothing too fancy. This program is only going to be deployed internally, but we still want to be secure with our SQL connection info. What's the best way I should go about encrypting/securing my connection string in the program? I've seen examples for .NET programs using AppSettings, but I'm not seeing a Setting stab in my Solution properties. This is my first time developing an application in C#/Visual Studio 2008, so there might be some kind of setting I'm missing. Thanks for the help.

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  • Which is the good C++ GUI Framework

    - by Suriyan Suresh
    I know there are plenty of C++ GUI libraries out there. Here is an incomplete but significant list: MFC Qt wxWidgets Ultimate++ WTL Win32 Win32Gui WinForms Here is what i want Well documented Modern (and well designed) interface Easy to use Widely used GUI editor (RAD tool) Free

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  • Entity Framework This property descriptor does not support the SetValue

    - by Gayan
    Hello guys, below are my entities which i have created using entity frame work. retailer id name childs(navigation) generated database schema [Id] [int] IDENTITY(1,1) NOT NULL, [Name] nvarchar NOT NULL childern id name RETAILER(navigation) generated database schema [Id] [int] IDENTITY(1,1) NOT NULL, [name] nvarchar NOT NULL [Retailer_Id] [int] NOT NULL, As you can see in the above model the relationship is 1 retailer can have 0 or 1 child. my problem is when i create a new child and set the retailer navigation property of it to a retailer entity it throws the following exception.how do i solve it Error while setting property 'retailer': 'This property descriptor does not support the SetValue method.'.

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  • Entity Framework Create Database & Tables At Runtime

    - by dhsto
    I created some tables in an .edmx file and have been generating the database by selecting "Generate Database From Model" and manually executing an .edmx.sql file on the database to build the tables. Now, however, I am creating a setup dialog that allows the user to connect the program up to their own database. I thought running context.CreateDatabase would be good enough to create the database, along with the tables, but the tables are not created. What is the preferred method for creating the database and tables when the user specifies their own server and database to use, when originally starting with a model?

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  • Complex orderby question (entity framework)

    - by PFranchise
    Ok, so I will start by saying that I am new to all this stuff, and doing my best to work on this project. I have an employee object, that contains a supervisor field. When someone enters a search on my page, a datagrid displays employees whose name match the search. But, I need it to display all employees that report to them and a third tier of employees that report to the original employee's underlings. I only need three tiers. To make this easier, employees only come in 3 ranks, so if rank==3, that employee is not in charge of others. I imagine the best method of retrieving all these employees from my employee table would be something like from employee in context.employees where employee.name == search || employee.boss.name == search || employee.boss.boss.name == search But I am not sure how to make the orderby appear the way I want to. I need it to display in tiers. So, it will look like: Big Boss Boss underling underling Boss underling Boss Boss Big Boss Like I said, there might be an easier way to approach this whole issue, and if there is, I am all ears. Any advice you can give would be HIGHLY appreciated.

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  • Entity Framework model and foreign key property

    - by verror
    I have 2 tables that I import to EF model. First table has a property [section] that acts as foreign key to the second table. When I map this property in model to the table and try to compile I get this error: Problem in Mapping Fragments starting at lines 158, 174: Non-Primary-Key column(s) [Section] are being mapped in both fragments to different conceptual side properties - data inconsistency is possible because the corresponding conceptual side properties can be independently modified. If i remove this property from the model it passes, but when I query the data I don't have the section field. I know that I can get it by using the navigation field and reading this property from the second table, but to make it work I must include the other table in my query. var res = from name in Context.Table1.Include("Table2")... Why do I need to include the association just for one field?

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  • How to create relationship mapping via Entity framework

    - by James
    I have following domain model: User { int Id; } City { int Id; } UserCity { int UserId, int CityId, dateTime StartDate } In the function where I have to attach a user to a city, the following code is working for me: UserCity uc = new UserCity(); //This is a db hit uc.User = MyEntityFrameworkDBContext.User.FirstOrDefault(u => u.ID == currentUserId); //this is a db hit uc.City = MyEntityFrameworkDBContext.City.FirstOrDefault(c => c.ID == currentCityId); uc.StartDate = userCityStartDate; //this is a db hit MyEntityFrameworkDBContext.SaveChanges(); Is there any way I can create relationships with just one single DB hit? The first two db hits are not required, actually.

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  • Delete database. Entity Framework

    - by Idotz
    I have a very annoying issue and I would love a solution. The problem: I followed the MDSN tutorial- http://www.asp.net/mvc/tutorials/mvc-4/getting-started-with-aspnet-mvc4/adding-a-model Then I tried this guide according to my needs and I set up a database GAMES.MDF.   Then, I deleted the database and set it up again, is supposedly work (I can write and read data), but There is no such database in the APP_DATA folder. Like it keeps it somewhere in my PC and reuse it.   I even tried a new project and it did not work, works but not in the library, and it even uses the data I created before. I even deleted the DB from SQL Server Management Studio 2008. Does anyone know what the hell? How do I delete it permanently, not to remain any trace of him?   Thank you.  Ido

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  • Simple python mvc framework

    - by Overdose
    Is there any lightweight mvc webframework which is not necessary to install to the server? I need something simple, that i could just copy to the shared hosting. And it must handle urls other that localhost/test.py, something like this localhost/Blog/test

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  • Entity Framework 4 Entity with EntityState of Unchanged firing update

    - by Andy
    I am using EF 4, mapping all CUD operations for my entities using sprocs. I have two tables, ADDRESS and PERSON. A PERSON can have multiple ADDRESS associated with them. Here is the code I am running: Person person = (from p in context.People where p.PersonUID == 1 select p).FirstOrDefault(); Address address = (from a in context.Addresses where a.AddressUID == 51 select a).FirstOrDefault(); address.AddressLn2 = "Test"; context.SaveChanges(); The Address being updated is associated with the Person I am retrieveing - although they are not explicitly linked in any way in the code. When the context.SaveChanges() executes not only does the Update sproc for my Address entity get fired (like you would expect), but so does the Update sproc for the Person entity - even though you can see there was no change made to the Person entity. When I check the EntityState of both objects before the context.SaveChanges() call I see that my Address entity has an EntityState of "Modified" and my Person enity has an EntityState of "Unchanged". Why is the Update sproc being called for the Person entity? Is there a setting of some sort that I can set to prevent this from happening?

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  • Entity framework 4 add to many-to-many

    - by mehanik
    I have model whith 3 tabels and one is link table with additional field: Groups Id Name Users Id Name Roles Id Name LinkTable Id GroupId UserId RoleId The quuestion is how to add 3 related entities: Code bellow doesn't work. using (var db = new dbEntities()) { db.Groups.AddObject(Group.CreateGroup(1, "TestGroup")); db.Users.AddObject(User.CreateUser(1, "AdminUser")); db.Roles.AddObject(Role.CreateRole(1, "Admin")); db.UserGroupRoles.AddObject(UserGroupRole.CreateUserGroupRole(1, 1, 1, 1)); db.SaveChanges(); }

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  • Replace Entity Framework object

    - by majkinetor
    In MVC app, I am having this big object that is used in classic view/edit/create pattern. When user edits the object I save it as: public bool SetMyObject(MyObject newObject) { MyObject current = GetObjectById(newObject.Id); current.Prop1 = newObject.Prop1 ... current.PropN = newObject.PropN db.SaveChanges(); } MyObject is pretty big so I am wondering is there any better way to do this, not involving per-property assignments. For instance something along the lines db.MyObject.UpdateObject(current, tnew). Ty.

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