Entity Framework 6 - Knowledge Base (KB)
20 results in tag: exception
Autonumber with Entity Framework
I want to loop through a collection of objects and add them all to a table. The destination table has an auto-increment field. If I add a single object there is no problem. If I add two objects both with the primary key of zero, the entity framework fa...
asked by dcompiled
complus Exception code -532462766
Using visual studio 2010, entity framework 4.0, ADO.NET POCO Entity Generator...On the code lines:...MecDbEnt.Domains.AddObject(subject);...MecDbEnt.SaveChanges(); (on this line)...the application throws follow exception:...complus exception code -53246...
asked by Masna
Duplicate key exception from Entity Framework?
I'm trying to catch the exception thrown when I insert a already existing user with the given username into my database. As the title says then I'm using EF. The only exception that's thrown when I try to insert the user into to db is a "UpdateException" ...
asked by ebb
Why am I getting a "Unable to update the EntitySet because it has a DefiningQuery..." exception when trying to update a model in Entity Framework?
While updating with the help of LINQ to SQL using Entity Framework, an exception is thrown....System.Data.UpdateException: Unable to update the EntitySet 't_emp' because it has a DefiningQuery and no <UpdateFunction> element exists in the <Modificatio...
asked by Thomas Mathew
Adding Item with Many-to-Many Relationship In Entity Framework
I am getting a primary key violation error when I attempt to add an item with a many-to-many relationship:...I have two classes - Articles and Tags which have a many-to-many relationship : ...public class Article { public int ID { get; set; } publ...
asked by Judo
UpdateException: Operation is not valid due to the current state of the object when using Entity Framework and Oracle
I'm attempting to add a new Entity object for persistence, however I'm getting an ...UpdateException... who's inner exception is an ...InvalidOperationException... with the message:...Operation is not valid due to the current state of the object....Object...
asked by m.edmondson
Where to handle DB exceptions in Entity Framework and repository pattern
how would you design this scenario (using Entity Framework 4.1, Code First and repository pattern): the Visual Studio solution contains the following projects...Solution |-Web Application Project |-DAL Project |-Model Project ...So in the Model Project th...
asked by Savvas Sopiadis
The specified store provider cannot be found in the configuration, or is not valid
i use entity framwork with SQL Server CE 3.5 and i have this error ...The specified store provider cannot be found in the configuration, or is not valid....<Schema Namespace="OimDBModel.Store" Alias="Self" Provider="System.Data.SqlServerCe.3.5" ProviderMa...
asked by Tarek Saied
EntityFramework Exception : New transaction is not allowed because there are other threads running in the session
I am using ServiceBrokerClass which i got from ...CodeProject.... But now when i try to save any record into database using EnityFramework and .Net WPF. I am getting the following error....ServiceBrokerUtility Class :...using System; using System.Collecti...
asked by Kishore Kumar
EF Exception: String or binary data would be truncated. The statement has been terminated.?
I have read many posts related to this issue, but couldn't find an answer. I am trying to load a large amount of data from Excel into SQL Server. Thousands of records. And I am getting this exception:...String or binary data would be truncated. The statem...
asked by monstro
A first chance exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll
All,...I'm using DataBase First Entity Framework v4.4. In the DB (and data model) is Table1 that has a 1:many relationship to Table2....I am binding a DataGrid in WPF to Table1.Local.First().Table2 (for simplicity, assume that there is an entity in Table...
asked by William
EntityFramework,The specified store provider cannot be found in the configuration, or is not valid
I have a Winform application and am using EntityFramework. The application runs just fine in my dev machine but when I try to run at client's machine I get "The specified store provider cannot be found in the configuration, or is not valid" error. I have ...
asked by jeff
The provider for invariant name System.Data.SqlClient is specified multiple times
I've update Entity Framework to 6.0 and now I'm getting an exception that I can't figure out....An error occurred creating the configuration section handler for entityFramework: The provider for invariant name 'System.Data.SqlClient' is specified multiple...
asked by bflemi3
Exception when loading related objects. Entity Framework
I am getting an exception when loading related objects in my db. I am loading all my ...MatchData... objects and I want to iterate them with a foreach....The objects that I'm loading is:...MatchData Class:...public class MatchData { [Key] public v...
asked by Mads Gadeberg
Is this a bug in JSON.NET or Entity Framework or am I doing something wrong while trying to serialize a list of Exceptions with JSON.NET?
Got this error when trying to serialize a set of errors:..."ISerializable type 'System.Data.Entity.Infrastructure.DbUpdateConcurrencyException' does not have a valid constructor. To correctly implement ISerializable a constructor that takes SerializationI...
asked by Triynko
Exception of type 'System.InvalidOperationException' occurred in System.Core.dll but was not handled in user code
I get the below excption:...Exception of type 'System.InvalidOperationException' occurred in System.Core.dll but was not handled in user code...Additional information: The sequence does not contain Elements....at line...var kategoria = db.Kategorie.Includ...
asked by Lukasz
DbUpdateException: Which field is causing "String or binary data would be truncated"
I am getting a ...DbUpdateException... with message ...String or binary data would be truncated...I understand that one of the fields in the entity won't fit the length of the column in the database. And that I could go down and check them manually....Wha...
asked by Doomsknight
Handling exceptions for each entity in context.saveChanges()
Is it possible to get the specific exception of failed save for each entity in a bundle?...The simple use of saveChanges() gives one exception for all the bandle ....This is my code with try-catch block.:... foreach (EntityBase ent in response.Entities) ...
asked by user1012506
Entity Framework: one or more of the foreign-key properties is non-nullable
I have a very complex database model. My program computes some ...data+db entries... and ...modifies+generates new entries... to update+insert in the database....When I use database context to insert the entries, everything works. But when I try to save c...
asked by E. Williams
Can't execute Query in EF6.3
I have the following query:...var result = await _dbContext.ApplicationItems.ToListAsync(); ...At runtime I get an exception on that query line:...I don't know why this exception is happening....The class ApplicationItem looks like this:...public class Ap...
asked by Luka
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