MVC :: Updating 1 Column In EntityFramework?
Oct 28, 2010
I have Create and Edit forms for Categories. Columns are Id, CategoryName, Order, CreatedOn. On Create form I save the values for all but on Edit form I need to change only CategoryName. Below is the code. Problem is that on Edit form only CategoryName field exists which on submit button is passed to Edit Action. Whenever I update Order and CreatedOn becomes null because the values are not returned from form. Someone tell me any good approach how to Updated selected values in EF. Below is code.
Making multiple Get calls. Form is saving fine but I don't like the approach. Need clean approach. Anyone got better solution to thiis?
[Code]....
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[Code]....
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<asp:GridView ID="gvInfos" runat="server"
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CssClass = "gv_white"
DataKeyNames = "Id"
GridLines = "None"
Width = "100%"
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>
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Jan 24, 2011
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Dec 30, 2010
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Public member 'Sum' on type 'EntityCollection(Of Item)' not found.
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Am I getting the item count correctly?
How should I go about getting the sum of the prices of the items?
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Jan 15, 2010
I would like to call a method in the ObjectContext which returns EntityCollection and have it sorted the way I want by default. For example, Imagine I have the following Category table/class:
CategoryID (PK)
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pointing to CategoryID itself.
(This table is the base for a tree structure of Categories and SubCategories)
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<asp:Repeater ID="rptSubCategories" runat="server">
<ItemTemplate>
<%# Eval("CategoryID") %> - <%# Eval("Name") %>
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<%# Eval("CategoryID") %> - <%# Eval("Name") %>
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Simply and everything works! Except that, rptSubCategoryCategories doesn't gives sorted Categories by Name. The only way I found to do it, is to change its DataSource from:
DataSource='<%# Eval("SubCategories")) %>'
to:
DataSource='<%# ((EntityCollection<Category>)Eval("SubCategories")).OrderBy(p => p.Name) %>'
but I wish I could do something else to have a default sorting so i don't need to call the OrderBy. Something like Attributes like we do in DynamicData, following the tutorial at [URL] Setting the default sort column of an Entity with DisplayColumnAttribute. Unless somebody tells me it's impossible what I want to do.
Using .NET 4.0 BETA 2
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Jul 6, 2010
I got a problem when getting some data out of my EntityFramework using Linq
Heres my code
[Code]....
Heres the ClientViewModel :
[Code]....
As you can se in the ClientViewModel the Users property is a List
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Cannot implicitly convert type 'AdminMVC.Models.Clients_Username' to 'System.Collections.Generic.List<AdminMVC.Models.Clients_Username>'
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I'm working on a project which is using EntityFramework 4 and I am using the entity objects as my business objects. I ran into an issue recently where I had a context declared in a using statement in a user control. The method the statement was in returned an entity object which got used in another control. So I had to detach the entity then attach it to the new context in the other control. I would like to avoid this if possible. What I'm thinking is I would like to declare a context in the master page and then pass that to any page/usercontrol that needs it so they are all using the same context and I don't have to write all these using statements.
My questions are these:
1) is it a bad practice to declare a context on Pre_Init/Page_Load and then dispose of it on Page_Unload?
2) if it is what is the best practice for handling them?
3) if I do go the route of declaring the context in the master page what is the best way to pass that to the pages/usercontrols?
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Feb 22, 2011
I have not found any way to intercept or override calls to createquery in my datacontext. What I am trying to do is to allow for global filters, i.e. if a user has access to only a subset of entities I would like to filter away these on the lowest level possible. Is there a way to do this? I have tried several apporaches but no one worked out. Perhaps I lack patience or is just plain stupid, but I think it should be possible! So if anyone has any pointers to where
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Feb 11, 2010
I am having some issues with my base class inheritance. I am currently employing Table per Type Inheritance for the following tables:
Database:
Members Table
- Member ID (PK)
- First Name
- Last Name
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- ...
Students Table
- Member ID (FK)
- Credits
- Notes
- ...
Instructors Table
- Member ID (FK)
- Biography
- Office Hours
- ...
My Entity Data Model defines "Member" as the base class for both Students and Instructors, since members can be both students as well as instructors simultaneously. The problem, however, occurs when I attempt to get a list of Members objects. Because the database contains members who are indeed students AND instructors, the following exception is thrown:
All objects in the EntitySet 'CountyCollegeEntities.BaseMembers' must have unique primary keys. However, an instance of type 'CountyCollege.NET.Administrator' and an instance of type 'CountyCollege.NET.Student' both have the same primary key value, 'EntitySet=BaseMembers;ID=10016'.
I am beginning to think that I made a mistake by building these classes to inherit from Member although it has been ideal up until this point. But before I start ripping up all my existing code to remove this inheritance, I thought I would see if anyone has any tricks that would make this work. Any advice as to either how I can get around this error or a more appropriate way to structure my classes would be very much appreciated.
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May 2, 2010
Cannot seem to find a good fit for my question so I will ask here.
Does Asp.Net 4.0 solve the problems with using Views with EntityFramework is not able to recognize primary keys.
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Sep 29, 2010
Scenario:
I am creating a custom gridview control which has a custom CheckBoxTemplateField column (deriving from TemplateField class). This template field column has custom Checkboxheadertemplate (implementing ITemplate) and CheckboxItemTemplate (also implementing ITemplate). In InstantiateIn method of both templates (header as well as Item template), I am adding a checkbox control which has Autopostback = true.
My requirement is:
I want to mark all the values in the binding column of datasource if checkbox in headertemplate is checked. I dont want to mark only rows visible on grid. I WANT TO MARK ALL ROWS IN DATASOURCE. I want to do this in _CheckedChanged event of checkbox in header template.
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Oct 27, 2010
I want to update object via entity framework
For example I have to changed object:
Obj1
Obj2
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[code]....
I try to Save with ApplyPropertyChanges but the data didn't saved
How can I update object?
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I want to copy data from a table[tblExcel][No.of columns:2] to another table[ev_event] which has 5 columns, 2 columns from the another table, 3 columns from user defined value
[code].....
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