Get The Id Of A New Record In SavingChanges Event On The Entityframework?
Jul 21, 2010
Im tring to implement some generic logging in the entityframework 4.0 using the SavingChanges event in the entity context.
I want to record details about any create/ update and deleted records including the id of the record being changed (which is always an int identity field). During the update and delete processes I can get the id for the record using
Dim AddedItems = Statemanager.GetObjectStateEntries(EntityState.Added)
For Each entry As ObjectStateEntry In DirectCast(sender, ObjectContext).ObjectStateManager.GetObjectStateEntries(EntityState.Added)
NewLogItem.RecordId = CInt(entry.EntityKey.EntityKeyValues(0).Value.ToString())
Next
But I obviously cannot get the id of the about to be inserted record during an insert becuase it hasn't been written to the database yet, is there a simple way around this?
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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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Dec 30, 2010
I am working on my first project with the Entity Framework and am having some difficulty displaying advanced information with the EntityDataSource and a ListView.
For example, given the two entities:
Item
Name
Price
Order
Number
Items <---- Navigation Property to Items contained in the Order
I want to display a list of all orders with a column with the total number of items in the order and a column with the sum of the prices of all items in the order.
I am using an EntityDataSource configured as follows:
<asp:EntityDataSource ID="eds" runat="server" ConnectionString="name=NDSEntities"
DefaultContainerName="NDSEntities" EnableFlattening="False" Include="Items"
EntitySetName="Orders"></asp:EntityDataSource>
In the ItemTemplate of the ListView, I can write the order number as follows:
<%# Eval("Number") %>
I had trouble figuring out how to display a count of items in the order. I tried using Items.Count() function in select statement in the EntityDataSource but that didn't work. Eventually I figured out I could do the following in my ItemTemplate:
<%# Eval("Items").Count() %>
Now I am stuck trying to get the sum of the items. I am stuck here. I have tried using
<%# Eval("Items").Sum(Function(i) i.Price)%>
but I get the following error:
Public member 'Sum' on type 'EntityCollection(Of Item)' not found.
This confuses me because I know that Sum is a method of EntityCollection(Of ).
My two questions are as follows:
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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So how can this cause an UpdateException ?
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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)
Name
ParentID (FK_Category) foreign key
pointing to CategoryID itself.
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<ItemTemplate>
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<ItemTemplate>
<%# Eval("CategoryID") %> - <%# Eval("Name") %>
</ItemTemplate>
</asp:Repeater>
</ItemTemplate>
</asp:Repeater>
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rptSubCategories.DataBind();
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) %>'
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Using .NET 4.0 BETA 2
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[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 want to update object via entity framework
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Obj1
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[code]....
I try to Save with ApplyPropertyChanges but the data didn't saved
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Here is my code:
[Code]....
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[Code] ....
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[Code]....
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