Recent questions tagged Entity

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entity framework - EF recovery from invalidoperationexception caused by server being down

I had a windows service relying on EF, and it was running fine until the server went down. The problem was ... ? Anyone had this happen before? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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867 views

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entity framework - Oracle ODP.Net and EF CodeFirst - edm.decimal error

I have the following simple entity: public class Something{ [DatabaseGenerated(DatabaseGeneratedOption.Computed)] public int ... . Any help? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - C# EF 4.1 Create table dynamically within DbContext

I want to add tables to a SQLCe database at runtime, since the tablenames are not static and known at ... some other technique? Thanks, Juergen See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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624 views

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entity framework - ViewModels with asp.net mvc 4 and EntityFramework whats the Point

I'm debating with myself whats the point in creating ViewModel classes in a project which uses Entity Framework? ... I missing something here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - If I select from an IQueryable then the Include is lost

The include does not work after I perform a select on the IQueryable query. Is there a way around this? ... I just keep getting Null exceptions See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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896 views

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entity framework 4 - See SQL From EntityFramework with Collection-like Queries

I do not have 'full' the version of MS SQL (SQL Express 2008) so I do not have the profiler tool. I ... from this manner of coding? Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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737 views

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entity framework - Migration does not alter my table

I just enabled migrations in my project and added a few fields to UserProfile: [Table("UserProfile")] public class ... . How did this happen? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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674 views

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entity framework - What is the point of the Update function in the Repository EF pattern?

I am using the repository pattern within EF using an Update function I found online public class Repository<T> ... yet it seems destructive. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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847 views

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entity framework - EF Core could not be translated and will be evaluated locally

I have a query in EF Core 1.1.2 that is evaluated on client side and would like to know if there is a better ... bool Flagged { get; set; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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981 views

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entity framework 4 - LINQ to Entities StringConvert(double)' cannot be translated to convert int to string

Problem Need to convert int to string using EF4 + SQL CE4. The recommended option of using SqlFunctions.StringConvert( ... I stay with L2S. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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989 views

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entity framework 4 - DbContext SaveChanges Order of Statement Execution

I have a table that has a unique index on a table with an Ordinal column. So for example the table will have ... properly, please let me know... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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921 views

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entity framework 6 - How to set the one-to-one relationship with fluent api in this case? (EF6)

I have this two entities: public partial class Ficheros { public Guid Idfichero { get; set; } public long ... ID is a uniqueidentifier. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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982 views

1 answer

entity framework - Why does code first/EF use 'nvarchar(4000)' for strings in the raw SQL command?

Essentially I have a table with zip codes in it. The zipcode field is defined as 'char(5)'. I'm ... Any assistance/advice would be appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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870 views

1 answer

entity framework 5 - EF code first - custom foreign key constraint name

I wonder if there is any chance to change name of foreign key constraint generated by Entity Framework when using ... looks much cleaner to me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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808 views

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entity framework - Linq To Entities - Any VS First VS Exists

I am using Entity Framework and I need to check if a product with name = "xyz" exists ... I think I ... the best performance? Thank You, Miguel See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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815 views

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entity framework - Generic class with Id c#

I am not sure if this is possible, but I have started a new project and I am trying to clean up the way I ... Is this the best way to do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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781 views

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entity framework - How should I create secondary DbContext using ContextProvider.EntityConnection?

I'm using breeze with Code First EF. My production DbContext has IDatabaseInitializer that throws an ... ContextProvider's EntityConnection? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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964 views

1 answer

entity framework - GetTable equivalent for ObjectContext

I was previously using a DataContext which had a GetTable(type) method to get tables generically. Example: context. ... It has to be generic. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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800 views

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entity framework - Get Model schema to programmatically create database using a provider that doesn't support CreateDatabase

I'm using the SQLite provider for Entity Framework 5 but it doesn't support CreateDatabase and thus cannot auto ... the table properly? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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771 views

1 answer

entity framework core - Many to Many index creation convention

My question is related to this SO post, but instead of preventing I want to understand what's the convention of creating ... Version="3.1.2" /> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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707 views

1 answer

entity framework - 'EditItem' is not allowed for this view. WPF .NET 4 / EF 4.1 - Master - Detail

Ok, in order to try to find an answer for this question I have made an even simpler project, using the AdventureWorks ... using EF 4.1 - help! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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877 views

1 answer

entity framework 4.1 - Include with projection does not work

I have this query var test = context.Assignments .Include(a => a.Customer) .Include(a => a.Subscriptions) . ... .First().Actions.First().Name; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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855 views

1 answer

entity framework core - Identity Server 4 Claims empty on API

I have been trying to Integrate Identity Server 4 with SPA application. I am able to Authorize the Application ... : "Unprotect ticket failed" See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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890 views

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entity framework - Exponentially deteriorating performance on inserts in SQL Server Compact 4.0 tables with an Identity column

EDIT: the issue below has been fixed in the Entity Framework 6. Running the code below takes a disappointing ... client side generated IDs? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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790 views

1 answer

entity framework - How to use a different connection string (but same database) for migrations

I have been using a connection string like this to connect my website to my database: <add name="MyDb" ... I stop it doing that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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665 views

1 answer

entity framework - FirebirdSql.Data.FirebirdClient.FbException: too many open handles to database

Today I did a larger data import into a firebird 2.5.6 database and I got this exception: System.Data.Entity. ... google only shows 1 old entry. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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919 views

1 answer

entity framework - EF4: ObjectContext Lifetime?

I am developing a WPF desktop app that uses Entity Framework 4 and SQL Compact 4. I have seen two distinct ... other? Thanks for your help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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814 views

1 answer

entity framework - ef 5 codefirst enum collection not generated in database

I am using EF5 and .NET 4.5. I have one particular class that is being generated incorrectly in the database ... the roles in the database. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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