entity-framework-core

问题 I have my models like this: Goup.cs GroupUser (pivot table) ApplicationUser (User) -> 4. Profile And now I want to show the data in Profile on a details page when the User belongs to the group. I'm doing this like this: private IEnumerable<GroupUser> GetUsers(int groupId) { IEnumerable<GroupUser> model = null; if(groupId == 0) { model = _kletsContext.GroupUser.OrderByDescending(o => o.GroupId).AsEnumerable(); } else { model = _kletsContext.GroupUser.Where(g => g.GroupId == groupId).Include(p

问题 I have my models like this: Goup.cs GroupUser (pivot table) ApplicationUser (User) -> 4. Profile And now I want to show the data in Profile on a details page when the User belongs to the group. I'm doing this like this: private IEnumerable<GroupUser> GetUsers(int groupId) { IEnumerable<GroupUser> model = null; if(groupId == 0) { model = _kletsContext.GroupUser.OrderByDescending(o => o.GroupId).AsEnumerable(); } else { model = _kletsContext.GroupUser.Where(g => g.GroupId == groupId).Include(p

问题 I, am using package manager console to perform the database migration. I used the following command Add-Migration init This command work perfectly and created the migration object as see in the below image Now I am using Update-Database command to create the database however I, am getting an error as shown below I have used the solution provide here and this question. However, this solution is not working for me from visual studio. I, am able to use the sql server from SSMS. This error is

问题 Part 2 problem, which continues from here: EntityFramework Core - Update record fails with DbUpdateConcurrencyException Error: The derived type 'BinaryFile' cannot have KeyAttribute on property 'Id' since primary key can only be declared on the root type. I am trying to make inheritance for my entities as much as possible, so I remove duplication as much as possible. My inheritance structure: public interface IEntityMinimum { bool IsDeleted { get; set; } byte[] Version { get; set; } string

问题 I have a such table schema: CREATE TABLE Categories ( Id INT IDENTITY(1,1), Name varchar(100), CONSTRAINT PK_Category_Id PRIMARY KEY (Id) ) CREATE TABLE Products ( Id INT IDENTITY(1,1), IdCategory INT NOT NULL CONSTRAINT FK_Products_IdCategory__Categories_Id FOREIGN KEY(IdCategory) REFERENCES Categories(Id), Name varchar(100), Price decimal(18,2), ImageUrl varchar(256), CONSTRAINT PK_Product_Id PRIMARY KEY (Id) ) EF Core generated the following code: public partial class Categories { public

问题 I know there are some answered questions on SO about 1:0..1-relationships. I have looked at this and this, but don't think they apply to my question. I have these three (simplified) models in a CMS-system. public class FrontPageItem { public int Id { get; set; } public int ItemType { get; set; } // 1 = Article, 2 = WebPage, etc... public int? ArticleId { get; set; } public Article Article { get; set; } public int? WebPageId { get; set; } public WebPage WebPage { get; set; } } public class

问题 I have an entity that has owned type and i want to create relationship with another entity but the foreign key property exist on the owned type example:- This is my employee entity public sealed class Employee : AuditedAggregateRoot { public WorkInformation WorkInformation { get; private set; } } and it contains a value Object(Owned Type) called WorkInformation public class WorkInformation : ValueObject<WorkInformation> { private WorkInformation() { } public int? DepartmentId { get; private

问题 I am using EntityFramework Core with Npgsql provider, perform ILIKE query works fine: var query = dbContext.countries .Where(w => (w.name != null && EF.Functions.ILike(w.name, $"{search}%") ); Query is translated into PostgreSQL's ILIKE, so far so good. I am also building a dynamic LINQ based on annotation - [Searchable] or [Orderable] properties in models - and I am trying to find out how to perform ILIKE using Expressions and Lambda. Code: // works, except it produces just LIKE which is

问题 I'm trying to implement the Audit.EntityFramework.Core package from the Audit.Net repository but am running into some difficulty. I'm unable to save changes or target a different database. I've modified my SaveChanges and SaveChangesAsync function to call the Audit.Net DbContextHelper class's save functions but I'm missing something. Is there a way to do the following? Target another database for storing audit data using an audit DbContext that inherits from the DbContext I'm trying to audit?

问题 I am converting my application to .NET Core. In doing so, I am running into issues with EF Core and inserts. If I insert 1 or 2 rows then EF Core performs a normal SQL INSERT statement. But when I have 3 or more rows, it switches to a MERGE statement, which then fails with: The column reference "inserted.MyKeyColumn" is not allowed because it refers to a base table that is not being modified in this statement. My guess is that this is due to the fact that the query is actually running on a