ADO.NET :: Cannot Add An Entity That Already Exists
Aug 2, 2010I ma trying to update a sql table using linq using the below code and i get the subject error.
[Code]....
Similar Messages:
DataSource Controls :: Linq Update Via .attach() Giving Entity Exists Error?
Jan 5, 2010I have a "simple" method that takes a Linq entity containing the information I want to update. The method then creates a list of counties the information is to be updated for, and tries to update the information for each county.
So user goes in fills form out selects update All counties, and the information in the form should be updated for all the counties for the member. Here is the code.
[Code]....
The first pass through the foreach runs perfectly, the second time through I get an error: Cannot attach an entity that already exists.
What is best way to work around this?
I have though about putting the foreach loop in my business_logic layer, and have it pass both the newRecord and OldRecord, but figured I would ask, before making the code change.
C# - DirectoryInfo And Path.GetDirectoryName - Exists Method Returns False While Exists?
Dec 13, 2010I would like to check whether a folder exists or not if not create. I'm sure this folder exists, but for some reason I get "false" when I check with "Exists" method.
The only reason I think could be because of the W: drive? I moved this application to production site and even there it returns false.
while I'm type in Windows explorer on my localhost and on the server "W:/Webs/ASPPages/cropper/uploads" it opens this folder. So my localhost and IIS server has W: mapping.
for test I tried to create the folder then it says can't find the path...
userFolderName = @"W:/Webs/ASPPages/cropper/uploads"
//I also tried @"W:WebsASPPagescropperuploads"
//I also tried @"W:WebsASPPagescropperuploads"
//I also tried "W:\Webs\ASPPages\cropper\uploads"
DirectoryInfo dirInfo = new DirectoryInfo(userFolderName);........
Entity Framework -Update Entity When Another Entity Is Updated
Jun 30, 2010I have an EDM, it includes the entities extension and history. My goal is to use history to keep track of all the changes made to extension entity. For example, if extension with ID 223 has its property 'Name_Display' changed - I want the history entity to record this.
I'm using ASP.NET with VB.NET. Where in my code do I put the hook to say, "update the history entity" and what should that hook look like?
MVC :: Using Data From Multiple Entity Framework4 Model Entity Objects In MVC2 Controller?
Sep 29, 2010getting data from multiple Entities models into an MVC controller. Most of the examples I have seen for using EF in an MVC2 app only use a single entitiy.
I have just started using MVC2 in C# using the Entity Framework models (CIOps.model) created from an SQL database. I can create the controller and views using single tables of the model in MVC2, but I just cannot get my head around how to get data from multiple entity tables into the controller (similar to joins in T-SQL). I have included an example below of the controller code that works with a single entity table, tbl_tours (tbl_tour in DB).
Could someone please illustrate how this code would be changed to include additional columns from FK tables in addition to tbl_tours columns. E.g. the clients name from the tbl_clients, the coordinators name from the tbl_employees, and costs from tbl_costs entities? Is it possible to do this directly using the EF model entities/classes that are already created and not use LINQ, POCO, Repositories, etc.? The FK relationships are already in the EF models. I have included the whole controller code, but I just need a few examples of how to join the multiple entities, not rewrite every CRUD function function in the controller. I think this will get me over the hump in using EF in an MVC2 App. Also ignore the fact I am using the home controller, this will change in the application.
[Code]....
Cast Exception When Try To Insert Entity In Entity Framework (using Code-f)
Feb 9, 2011I get an cast exception when i am trying to insert an entity in Entity Framework (using code-first). From this code :
public virtual T Insert(T entity)
{
return Context.Set<T>().Add(entity);
}
The cast exception is like "impossible to cast ...Collection'1(Entity) to type (Entity)" I can't figure out why. I am pretty sure ive done everything right. Post entity
public class Post
{
public long PostId { get; private set; }
public DateTime date { get; set; }
[Required]
public string Subject { get; set; }
public User User { get; set; }
public Category Category { get; set; }
[Required]
public string Body { get; set; }
public virtual ICollection<Tag> Tags { get; private set; }
public Post()
{
Category = new Category();
if (Tags == null)
Tags = new Collection<Tag>();
}................................
ADO.NET :: Entity Framework - Entity Stored Procedure Mapping - Can't Update
Feb 10, 2011I am mapping a stored procedure to an entity by right clicking on the entity (in the .edmx) and selecting "Stored Procedure Mapping." This brings you to a Mapping Details - "Name of Entity" Window that allows you to select the insert, update, and delete stored procedures associated with the Entity. It also maps the stored procedure parameter to the Entity "Property" (Column).
I'm gettin an error "error 2042: Parameter Mapping specified is not valid." The cause of the error is fairly obvious, in the Insert stored procedure that has been selected, a 'CHAR' parameter is being mapped to an Int32 Entity Property. I altered the stored procedure parameter to match the entity, I deleted the stored procedure, readded, and reslected it as the Insert function. I also cleaned, validated, updated model from database. No matter what I do, the parameter list in the mapping details doesn't reflect the change to the stored procedure. It's stuck on a char --> int32 mapping, even though it has been changed, like it's buried deep in meta data some where.
ADO.NET :: Adding A New Entity In Entity Framework 3.5 With Related Data?
Aug 5, 2010I am trying to add a new entity and have to refernce associated data to add it. I cannot load the Referencetables. Giving "The EntityReference could not be loaded because it is not attached to an ObjectContext." How do i complete this task in Entity Framework 3.5
[Code]....
ADO.NET :: Entity Framework Copy Entity And Change PK And Save Old And New
Mar 31, 2011I have a stupid problem with the Entity Framework. I get the following Exception:
[Code]....
I have an entity with a 4 fields representing the primary key. I copy it via serialization (works fine). I set the old entity to not valid (Datefield set to a date in the past, this field is part of the PK) and set the copied entity to DateTime.Now.Date. When I call context.AddObject I get the Exception above. I tried copying the entity via reflection but the entity has 3-4 references. And when copied, I get another Exception before even Adding the entity to the context. I also tried setting newObj.EntityKey = null and reset all the fields neccessary for the PK. I just want a whole copy of an entity with a different primary key (and some other fields changed too) and Create it in the database.
How To Simply Update Entity In Entity Framework
Sep 21, 2010I'm writing a custom .NET MembershipProvider (not the built in one) and trying to update using Entity Framework. But of course i have no access to (Try)UpdateModel. How can i update it?
View 3 RepliesHow To Remove / Delete 0..1 Entity In Entity Framework 4
Jan 5, 2011I have an Events table and an InstallmentPlans table. The relationship is 0..1 : an Event can have 0 or 1 Installment plans. If I want to remove the existing InstallmentPlan for an event, how do I do this? Setting it to null doesn't seem to work:
_event.InstallmentPlan = null;
Converting A Named Entity To An Entity Number?
Jan 21, 2011Does ASP.NET provide any built in functionality for converting a named entity into its corresponding entity number? For example, I want to convert to , " to " and so on.
View 3 RepliesADO.NET :: Entity Framework: Getting Key Of Newly Inserted Entity?
Feb 3, 2011Here's a simple code snippet where I create a new Entity object and call SaveChanges() to create a new record in the mapped database table.
[Code]....
What I'm trying to figure out is whether there is a way to derive this new key for my entity, e, from the ObjectContext, m? The reason for this is that the way my actual code is structured, my entity object is already out of scope at the point where I call the SaveChanges() method.
ADO.NET :: Order By An Include Entity In Entity Framework?
Sep 24, 2010I am trying to do something like this:
[Code]....
But ofcourse it is not working as I want to. The Ordering works on Question.Order, but I would also the
Questions.SubQuestions List to be ordered according to SubQuestions.Order
Exporting Entity Framework 4 Data Model To Entity Framework 3.5?
Oct 25, 2010Is there a way to export a EF 4.0 Data Model to EF 3.5?
I looked around and found that we are not able to access EF 4.0 from a ASP.Net 3.5 project here: [URL]
Our project is the 1st to go to .Net 4.0 using Entity Framework and we (the team) were wondering if there was a way for the other projects that "might" need to access our data that are still using the .Net 3.5 framework.
ADO.NET :: Difference Between Entity Name And Entity Set Name?
Dec 15, 2010I'm using .Net 3.5 with SP1.
I'm not sure about the difference between entity name and Entity Set Name
ADO.NET :: Entity Framework With Stored Procedure Versus Entity Framework Without Stored Procedures
Nov 2, 2010I am new to entity framework , it is really very good , but I want to know what is the difference between using entity framework with stored procedure or without stored procedure , which one the faster and what is the benefits for using stored procedures with entity framework.
View 1 Replies.net - Row Does Not Exists In DB- Exception?
Oct 25, 2010We have a dataset dsActualCost which fetches query value: MonthName in one column and Cost in another.
We have a code to display data in table format.
For MonthIndex = 0 To dsMonth.Tables(0).Rows.Count - 1
Dim tdMonthlycost As New TableCell
If dsActualCost.Tables(0).Rows.Count > 0 Then
[code]...
How To Check If A Record Exists
Jul 26, 2010I tried to illustrate the problem by providing the following instructions, unfortunately the data was deleted and the example failed. It is now working. I have been working through one of Scott Mitchells ASP.NET Application Tutorials Title "Using TemplateFields in the GridView Control"
The URL is ...
The example demonstrates a temporary field being used in different ways, one of which involves dates in a Calender. If the HireDate in the example is deleted or not available the program fails. Providing the date is a valid date it works fine....
Get An Error / Key Already Exists In This Method
Jan 6, 2010I want to know how it is possible that I get an error like this: key already exists in this method:
[Code]....
Aspxerrorpath For Page That Exists?
Mar 15, 2011I added a new directory and page to my website. when I try to browse to this new page I get redirect to my Default.aspx page with ?aspxerrorpath= appended to the query string.IIS shows the page is visible. The page is there. Why would I not be able to access this page?
View 6 RepliesDatabase Already Exists Choose A Different Name?
Apr 1, 2010Here's the case I created this Permias.mdf on another solution that I had and then after that I decided not to use that solution and created a new website from visual studio and copy and paste the .mdf file to be used for this website.
Database 'C:\Permias.mdf' already exists. Choose a different database name.
Check User Id Already Exists?
May 22, 2010i am building a project using C# Asp.Net in which i am registering users with a user id, now my question is that how to check that the user id is already exists in the user table or not when user trying to register, i am using sql server 2000?
View 3 RepliesADO.NET :: Error - Key Already Exists In The ObjectStateManager
Feb 17, 2011I have a property object that has many activities associated to it. I want to delete all the activities and then add specific ones back in. I am doing this all before the objectcontext save. I am using multiple objectcontexts and attaching/detaching the objects. I am getting the property from the propertyreository objectcontext which is the primary context. Then I get the user which takes a bool to determine if I want to detach from the userrepository object context. I attach to the propertyrepository.
All is good but when I remove all the activities from the property object (entityobject) and then try to attach the activity that I retrieve from the database I get the error: key already exists in the ObjectStateManager Error. When I remove all the activity entity objects from the property entity object they are not really deleted from the objectcontext or the database until I use the save() on the objectcontext which will change all the entity object statuses. How then after I remove the activity do i add it back to the property.Activities?
Controller
[Code]....
Property class
[Code]....
SQL Server :: Add Data That Maybe Already Exists?
Nov 22, 2010I have a database for a shop. Now I have run into problem when I'm adding products. I have a page where i add general info of the product that will be adding to the product table. Then I should have a page where I can add colors and sizes and so on. But how do I do that? When I add the product I set a price in the productdetail table and colorId and sizeId is sett to null. If I add a color to the table how do I do this the easiest way? I will not have a product where both colorId and sizeId is null. I have this SP and table structure. Then I'll do the same when I add sizes.
[Code]....