entity-framework

问题 I knew that Inverse Property is used when you have multiple relationships between classes. but I am confused between inverse property and foreign key property since both of them are used for defining relationships. public class PrivilegeToDbOperationTypeMap : BaseEntity { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity), Column(Order = 0)] public int PrivilegeToDbOperationTypeMapId { get; set; } [ForeignKey("privilegeLookup"), Column(Order = 1)] [Index("IX_PrivilegeLookupId

问题 I knew that Inverse Property is used when you have multiple relationships between classes. but I am confused between inverse property and foreign key property since both of them are used for defining relationships. public class PrivilegeToDbOperationTypeMap : BaseEntity { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity), Column(Order = 0)] public int PrivilegeToDbOperationTypeMapId { get; set; } [ForeignKey("privilegeLookup"), Column(Order = 1)] [Index("IX_PrivilegeLookupId

问题 I've created dockerized ASP.net Core app with auto-generated identity setup (so I've already had by default entity framework configuration). I've created SQL Server as separate container, here is my docker-compose.yml : version: '3.4' services: blazorapp1: image: blazorapp1 build: context: . dockerfile: Dockerfile depends_on: - db db: image: "mcr.microsoft.com/mssql/server" environment: SA_PASSWORD: "[SOMEPASSWORD]" ACCEPT_EULA: "Y" I've tested database configuration: as Visual Studio

问题 I am trying to compute the entity framework tutorial" Creating a Model for an Existing Database in Entity Framework Core // entityframeworktutorial.net"- When I enter the command: PM> Scaffold-DbContext" Server =. \ SQLEXPRESS1; Database = SCHOOLDB.MDF; Trusted_Connection = True; " Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models I get the error: ScriptHalted Database Picture Used by: - Visual Studio - 2019. Community - 16.3.6; - Console application. Core 3.0; - Microsoft

问题 How to do I make exists with dynamic LINQ? I'm trying to create an SQL clause with dynamic LINQ. I researched a lot of and not found an satisfactory answer. I try convert the SQL query as follows: SQL select * from Documento where exists( select 1 from Titulo where Documento.codDocumento = Titulo.codDocumento and Documento.codEmpresa = Titulo.codEmpresaDocumento and Titulo.codFluxoConta = 'SomeValue' and Titulo.codEmpresaFluxoConta = 'StringNumerical') In common LINQ I did as follows: var

问题 Im using the DynamicQueryable.Select() // dynamic select library The only docu I have found so far is System.Linq.Dynamic docu I have this query with anonymous return type which works. var result = Context.Set<TPocoText>().Where((Expression<Func<TPocoText, bool>>) whereLambda) .OrderByDescending(t => t.RowVersion).Skip(skip).Take(take) .Select("new (m1,m2,Nav1) "); and this works like select(t=> new {t.m1,t.m2,t.Nav1}) as expected my Question How can it do the equivalent of select(t=> new {t

问题 I'm using Linux more specifically Xubuntu. I have installed SQL Server Express on my machine. I'm currently in the making of a web app and my connection does not seem working or I don't understand everything quite right? The output I get is : A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.

问题 This question already has an answer here : EF Core returns null relations until direct access (1 answer) Closed 18 days ago . I have these two classes, Field and Field2 with a one-to-many relationship. When I am trying to get Field , the list returns with records with the id and the name, which is correct. But trying to read the Field2 from Field is always empty. What can be the cause? I have tried everything. I can see the FK in the database etc. public class Field : IEntityBase { public int

问题 This question already has an answer here : EF Core returns null relations until direct access (1 answer) Closed 18 days ago . I have these two classes, Field and Field2 with a one-to-many relationship. When I am trying to get Field , the list returns with records with the id and the name, which is correct. But trying to read the Field2 from Field is always empty. What can be the cause? I have tried everything. I can see the FK in the database etc. public class Field : IEntityBase { public int

问题 I have been searching for this answer and can't seem to find anything, but with EF4 I want to create a base model and put in our 'foundation' and any new project we create if we need to add custom tables to that sites db is it possible to add a model with just those specific tables and link it to the model in our 'foundation' I can't seem to find a good resource on something like this and this seems to be like it would be a normal thing to have a reusable base model and a separate one for any