Recent questions tagged Entity

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entity framework - SQL Azure EF Database First Connection String in Azure Management Portal

I have a site running n Azure, which uses EF Database First model. If I embed the connection string in the web. ... to do it via the portal. See Question&Answers more detail:os...

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

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684 views

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entity framework - System.NotSupportedException: Unable to determine the provider name for provider factory of type 'System.Data.SqlClient.SqlClientFactory'

I am using EF6 with Asp.net core and I am getting error when I call to db through ... .InvokeActionMethodAsync()} System.NotSupportedException See Question&Answers more detail:os...

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

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883 views

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entity framework - Use Linq query to compare date only with DateTime field

I need to compare just the date only in a Linq query that involves a datetime field. However, the syntax ... SymNumber == symNumber select a; 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

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entity framework 4 - How to get the latest date inserted from the table with Linq to entities

how to retrieve the latestdate inspected from a column In our app a user can inspect an item and when it ... and col name is LastdateInspected 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 - EF - DistinctBy on an IQueryable?

Say I have this where I want to get every person in group 42, but I want to get an IQueryable of each ... subject of a query to the repository. 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 - The property X is of type Y which is not supported by current database provider

I am really new to EF (using EF core 2.1) and have been following a bunch of tutorials so far, but now I ... there is a good reason to do so See Question&Answers more detail:os...

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

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951 views

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entity framework - stuck in EF migration limbo

i have somehow gotten my EF5 project into a state where I can't proceed. When I do an 'update-database' ... ? (beyond switching to NHibernate?) See Question&Answers more detail:os...

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

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768 views

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entity framework 4 - LINQ Query - how sort and filter on eager fetch

How do I do a eager query of a parent child relationship that: filters a on child fields sorts on both ... [1].children = IEnumerable<Child> See Question&Answers more detail:os...

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

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584 views

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entity framework - Efficient way of checking if many-to-many relationship exists in EF4.1

I have a many-to-many relationship between two entities - Media and MediaCollection. I want to check if a certain Media ... index, item); } } } See Question&Answers more detail:os...

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

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598 views

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entity framework - Programmatic data transformation in EF5 Code First migration

Is it possible to do any type of programmatic data transformation in Entity Framework 5 Code First migrations? ... the old table Ingredient. See Question&Answers more detail:os...

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

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557 views

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entity framework - Exception in Expression Trees

This is my model: - Business - BusinesType - FK - Categories (*) - FK - Branch (*) - BranchType - ... collection property it's meant to expose. See Question&Answers more detail:os...

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

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647 views

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entity framework - Change Fluent API mapping dynamically

Our project uses Entity Framework Code First. We wish to have an instance where a very simple POCO represents ... table via the ModelBuilder. See Question&Answers more detail:os...

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

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649 views

1 answer

entity framework core - ASP.NET 5/EF7 connection string in web.config?

In ASP.Net 4.5 I could put my connection string in the web.config as to take advantage of web.config ... EF look there for the strings? See Question&Answers more detail:os...

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

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1.1k views

1 answer

entity framework - EF connection string as DbContext constructor argument

I have seen some code sample that put an entity framework connection string as a constructor argument when creating a ... .5 entity framework 5. See Question&Answers more detail:os...

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

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878 views

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entity framework 6 - How to enable migrations (EF6) in an asp.net 5 project?

I created a new class library (package) project (prior to VS 2015 RC used the even worse name of asp. ... even though EF6 has been referenced? See Question&Answers more detail:os...

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

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741 views

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entity framework - LINQ to Entities does not recognize the method 'System.DateTime AddSeconds(Double)' method, and this method cannot be translated into

I receive this error on base {System.SystemException} = {"LINQ to Entities does not recognize the method 'System. ... idea how to solve 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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727 views

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entity framework - where is context.Entry()?

I wrote my own context by reading this article and many others, but none of theme explains where is this context.Entry( ... { 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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650 views

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entity framework - Implementing Repository pattern and doing Tests

I have read almost all articles about Repository pattern and different implementations of it. Many of them judged ... added the first question. See Question&Answers more detail:os...

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

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725 views

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entity attribute value - Magento 1 - get category ID from product ID

In magento how to get the category id of each product from its product ID. $items = $request->getAllItems(); $c ... ID. I want its category ID. See Question&Answers more detail:os...

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

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631 views

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entity framework core - Delete loaded and unloaded objects by ID in EntityFrameworkCore

I have a method that receives an IEnumerable<Guid> of IDs to objects I want to delete. One suggested method is ... order to delete the objects. See Question&Answers more detail:os...

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

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625 views

1 answer

entity framework 4 - ASP.NET MVC3 - Data Annotations with EF Database First (ObjectContext, DbContext)

How can we use Data Annotations for models if the models are generated with 4.1 ADO.NET DbContext Generator or something else? See Question&Answers more detail:os...

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

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779 views

1 answer

entity framework - EF code-first: How to load related data (parent-child-grandchild)?

I have this entity: public class DynamicPage { public int PageId { get; set; } public int Order { get; set; } ... 3) if any? Thanks to 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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794 views

1 answer

entity framework - Given LINQ to Entities does not support "Custom methods" how do you stay DRY?

I have run into this problem: Custom Methods & Extension Methods cannot be translated into a store expression ... with LINQ to Entities? 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 - Get sum of two columns in one LINQ query without grouping

I want to sum up three different fields of a table in one query. I want a linq equivalent of this T- ... Any suggestions? Thanks for your time. See Question&Answers more detail:os...

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

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560 views

1 answer

entity framework - Code First adding to collections? How to use Code First with repositories?

EDIT: This happen only on larger scale projects with repositories. Is there anybody using EF4 with CodeFirst approach ... SaveChanges(); } } See Question&Answers more detail:os...

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

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637 views

1 answer

entity framework 4.1 - Can I specify a discriminator column with a table-per-type mapping?

I have a class hierarchy that I want to map across several tables using Entity Framework 4.1 Code First. It's ... with a table-per-type mapping? See Question&Answers more detail:os...

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

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816 views

1 answer

entity framework - EF 4.1 CF: CREATE DATABASE permission denied in database 'master'

Entity Framework 4.1 Code First works great with SQLEXPRESS on localhost. However, I'm now ready to connect ... outside a particular 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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709 views

1 answer

entity framework - DataContractSerializer: How to serialize classes/members without DataContract/DataMember attributes

DataContractSerializer requires classes and members to be marked with the DataContract and DataMember attributes. However, in ... /13/50934.aspx See Question&Answers more detail:os...

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

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