Recent questions tagged Entity

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entity framework - Handling Dates with OData v4, EF6 and Web API v2.2

I'm in the midst of upgrading from v1-3 to v4, but I've run into a few problems. My understanding is that ... } This isn't valid in EF. See Question&Answers more detail:os...

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

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792 views

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entity framework - Is automapper preventing lazy loading with EF?

I have been using an AutoMapper and it seems that it gets me all the child entities (even if I don't ... I specify them. Thank you, Jakub See Question&Answers more detail:os...

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

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650 views

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entity framework - DbContext and RejectChanges

I was working with RIA services where ObjectContext has RejectChanges() method. However, I am now working with EF ... doing something (IsBusy)? 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 - Errors during Code First add-migration

Our add-migrations are failing routinely but not consistently. The migration always gets to the scaffolding step and ... and SQL Server 2012. See Question&Answers more detail:os...

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

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788 views

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entity framework core - Delete entities without loading them into memory

In Entity Framework Core I have the following Entity: public class File { public Int32 Id { get; set; } public Byte[ ... as it is big in size. See Question&Answers more detail:os...

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

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832 views

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entity framework - How to upgrade EF Core Tools

When I add-migration i got this warning: The EF Core tools version '2.1.1-rtm-30846' is older than that of ... but this hasn't worked for 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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538 views

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entity framework - Rendering a hierarchy using LINQ?

Let say we have a class Category { ID, Name, ParentID } and a List 1, 'Item 1', 0 2, 'Item 2', 0 3 ... Item 3 Item 3.1 Any help is 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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652 views

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entity framework 4 - LINQ Dynamic Query Library

I am building an ASP.Net MVC 3 application with Entity Framework 4. When the two pieces of code below are ... it to execute? Thanks Everyone. 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 - How to limit number of related data with Include

class Cat { public int CatID; public string Name; public ICollection<Post> Posts; } class Post { public int ... m using EntityFramework 4.3.1 See Question&Answers more detail:os...

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

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602 views

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entity framework - DBContext Added/Attached Event?

EF 4.1 RC. I want to run some code after an entity has been added/attached to the DBContext. Is there an ... do some stuff with it. 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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654 views

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entity framework - EF 5 Model First Partial Class Custom Constructor How To?

EF has generated for me some partial classes, each with a constructor, but it says not to touch them (example below), now ... Log>(); } ... } } See Question&Answers more detail:os...

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

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545 views

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entity framework - Using IDENTITY_INSERT with EF4

I am trying to create a record in the db that has a predefined primary key value. I know how to do this ... a stored proc for the inserts. See Question&Answers more detail:os...

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

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537 views

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entity framework - "Update Model from Database" does not see a type change

I have several columns that I changed from Int to BigInt. I opened up my EF model and did an 'Update Model ... it need to be manually applied? See Question&Answers more detail:os...

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

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972 views

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entity framework - EF Core 2.2 LINQ query not working in EF Core 3.0

Below code works fine at EF Core 2.2 bu not working on EF core 3.0 var items = (from asset in ... more detailed information. need help please See Question&Answers more detail:os...

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

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653 views

1 answer

entity framework 4 - EF4 cross database relationships

I was wondering if EF4 support cross-databse relationships? For instance: db1 Author Id Name db2 Posts Id Content ... guys have any idea? 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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657 views

1 answer

entity framework - Unity Lifetime Managers & EF Data Context --> Best Practice

All, There has been a lot of posts about Unity Lifetime Managers but I have yet to find someone state ... across several types with Unity See Question&Answers more detail:os...

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

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712 views

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entity framework - EF Data migrations won't detect changes when adding new migration

I am using Entity Framework 5.0 Data migrations along with code first. When i add a new field to my model ... a sql script with the changes. See Question&Answers more detail:os...

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

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776 views

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entity framework - LINQ to Entities for subtracting 2 dates

I am trying to determine the number of days between 2 dates using LINQ with Entity Framework. It is ... the entity framework? thanks Michael See Question&Answers more detail:os...

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

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600 views

1 answer

entity framework - Eager loading property of derived class using Include

I have classes like: Person { Name Address } Employee : Person { Compensation - object } Visitor : Person { ... good workaround for this issue? See Question&Answers more detail:os...

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

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2.0k views

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entity framework - Unable to determine a valid ordering for dependent operations

This is my model public string Content { get; set; } public Faq Reply { set; get; } public int? ... requirements, or store-generated values. See Question&Answers more detail:os...

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

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788 views

1 answer

entity framework - Get top N records using LINQ to Entities

I am using Linq to entities and would like to know if I can get a limited number of records when i query. ... get the top N using foreach loop? See Question&Answers more detail:os...

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

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567 views

1 answer

entity framework - C#/EF and the Repository Pattern: Where to put the ObjectContext in a solution with multiple repositories?

I have multiple repositories in my application. Where should I put the ObjectContext? Right now, I have a reference ... way to go about this? See Question&Answers more detail:os...

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

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601 views

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entity framework - Conditional eager loading?

I want to load an entity and it's children conditionally (I only want to eager load the children when the ... return an anonymous type. 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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509 views

1 answer

entity framework 4.1 invalid column name

I have two table News and NewsComments. I followed the rules of naming structure NewsComments public class NewsComment : ... 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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486 views

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entity framework - how to design ViewModel

I have EF 4 implemented in the project. Within it, there are tables customer and order. Which has ... populated with the correct reference? See Question&Answers more detail:os...

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

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470 views

1 answer

entity framework - Where is EntityConfiguration in EF4 VS 2010 RTM?

I cannot find EntityConfiguration. The same question for RC was here but I thought that it would make it to the RTM version. Is it there? See Question&Answers more detail:os...

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

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669 views

1 answer

entity framework - EF Code First 4.1 doesn't support nvarchar(max) at all?

I've spent decent amount of time on this problem and still can't figure out why EF team makes the life so hard ... do I deal with this thing? See Question&Answers more detail:os...

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

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613 views

1 answer

entity framework - How to create database using code first migrations?

I'm having ASP.NET MVC 3 project that uses Entity Framwork 4.3 and its migrations. Now I want Entity ... their creation order. 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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