entity-framework-6

问题 I have a model class named Foo that has, among others, these properties. public string StripeRecipientId { get; set; } public override bool HasProvidedBillingInformation { get { // return !string.IsNullOrEmpty(this.StripeRecipientId); return false; } } I have enabled migrations and am using Code First. When I run the update-database commandlet, whether with -Force option is specified or not, I get this error: Column names in each table must be unique. Column name 'StripeRecipientId' in table

问题 So, I have a DBContext, and I am doing the following operations: dbContext.SomeTables1.Add(object1) dbContext.SomeTables2.AddRange(objectArray2) dbContext.SomeTables3.AddRange(objectArray3) dbContext.SaveChanges(); The EF doesn't insert the db records in this order, it inserts them in a random order. To insert them in the same order, I have to do a dbContext.SaveChanges() after each addition. This is not an efficient solution and in my case, it is taking 10 seconds to do all my inserts, while

问题 I am porting our product's database to SQLite from another product that supported Guids. As we know, SQLite does not support Guids. I've got created an entity framework 6 model from my database (database first) and I need to build a query from C# that compares the Guid to one passed from the code. The thing is I can't find any documentation on how the SQLite Entity Framework provider handles Guids. A web search didn't find anything useful for me, either. Just questions about using Entity

问题 I am trying to adopt Jimmy Bogard's ContosoUniversityCore project I would like to do code first migrations, but not sure how to properly set it up. I added Migrator.EF6.Tools to my project. When I run Enable-Migrations I get this error: Exception calling "SetData" with "2" argument(s): "Type 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject' in assembly 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation, Version=14.1.0.0, Culture=neutral, PublicKeyToken

问题 I am using EF migrations to dynamically create a database model at run-time. This can happen many times, sometimes modifying existing tables and sometimes not. As every time i do a migration I don't want to create a massive context containing all the DbSets on the whole database I just want to include the tables I'm currently modifying. I am doing the migration in the following way Type contextType = null; //This will be my dbcontext DbMigrationsConfiguration migratorConfig = new

问题 I am quite new to entity framework. As a starter to understand more about EF, I am trying to make a generic implementation of EF6 following example of http://genericunitofworkandrepositories.codeplex.com/ . I was able to save data using same entity while tried plain and simple implementation when I started creating the project. But, now i got error while I tried to save data. The Error: OriginalValues '(($ReturnValue1)).OriginalValues' threw an exception of type 'System

问题 We decided to use a micro-orm against an Azure Database. As our business only needs "inserts" and "selects", we decided to suppress all code-managed SqlTransaction (no concurrency issues on data). Then, we noticed that our instance of Azure Database responded very slowly. The " rpc completed " event occured in delays that are hundreds times the time needed to run a simple sql statement. Next, we benchmarked our code with EF6 and we saw that the server responded very quickly. As EF6 implements

问题 We decided to use a micro-orm against an Azure Database. As our business only needs "inserts" and "selects", we decided to suppress all code-managed SqlTransaction (no concurrency issues on data). Then, we noticed that our instance of Azure Database responded very slowly. The " rpc completed " event occured in delays that are hundreds times the time needed to run a simple sql statement. Next, we benchmarked our code with EF6 and we saw that the server responded very quickly. As EF6 implements

问题 Is there a way to combine code-first and database-first in the same context? We are running into massive development-time performance problems when editing the EDMX file (it takes 1.5 minutes to save). I've moved our non-insert/update/delete UDFs/stored procs to some custom T4 templates that automatically generate model-first code, but I can't seem to get OnModelCreating to be called when EDMX is involved. Other things we've considered, but won't work for one reason or another: We can't

问题 Is there a way to combine code-first and database-first in the same context? We are running into massive development-time performance problems when editing the EDMX file (it takes 1.5 minutes to save). I've moved our non-insert/update/delete UDFs/stored procs to some custom T4 templates that automatically generate model-first code, but I can't seem to get OnModelCreating to be called when EDMX is involved. Other things we've considered, but won't work for one reason or another: We can't