ef-code-first

问题 I am working with an existing [poorly designed] database which stores a dollar amount as an integer (ie. $10.99 == 1099) in the database. I want my entity class to treat this value as a decimal so that consuming code doesn't have to do the translation. Is there a way to convert the value to and from integer to decimal and then back using Data Annotations or Fluent configuration? In the meantime I am using a hack which essentially "wraps" the integer property with a decimal property that

问题 In my app I am trying to follow DDD whilst modelling a simple fund account. The classes are FundAccount public Guid Id { get; set; } private ICollection<AccountTransaction> _transactions = new List<AccountTransaction>(); public IReadOnlyCollection<AccountTransaction> Transactions => _transactions .OrderByDescending(transaction => transaction.TransactionDateTime).ToList(); AccountTransaction public Guid Id { get; set; } public decimal Amount { get; set; ) I am trying to retrieve the fund

问题 I have a production and a development database. Now I want to generate a sql script based on a specific migration. When I enter the line to generate the script I get this error: '201608121243147_AutomaticMigration' is not a valid migration. Explicit migrations must be used for both source and target when scripting the upgrade between them. The command I use is as follows: Update-Database -Script -SourceMigration:201608121243147_AutomaticMigration -TargetMigration:201608281101542

问题 I'm using LINQPad v4.51.03 and attempting to create a DbContext connection from a code-first implementation in Entity Framework 6.0 (6.1.1). public partial class MyEntities : DbContext { public MyEntities() : base("mydbname") { ... The connection string looks like: <add name="mydbname" connectionString="Data Source=<db>;initial catalog=<cat>;integrated security=True;multipleactiveresultsets=True;application name=EntityFramework" providerName="System.Data.EntityClient" /> In the LINQPad 'Add

问题 I know this has been asked a lot before, but I still haven't found a working fix. I'm creating a desktop application which will regularly be started and stopped. The database is a MySQL database stored online and I'm using the newest version of EF and the MySQL connector. I'm also working code-first. For now, I only have 3 small entities, but these will grow a lot in time. The database is generated already at startup, so nothing needs to be created anymore. Every time the application is

问题 I know this has been asked a lot before, but I still haven't found a working fix. I'm creating a desktop application which will regularly be started and stopped. The database is a MySQL database stored online and I'm using the newest version of EF and the MySQL connector. I'm also working code-first. For now, I only have 3 small entities, but these will grow a lot in time. The database is generated already at startup, so nothing needs to be created anymore. Every time the application is

问题 I am quite new to ASP.NET at all, however this is my first app with ASP.NET Core. I have problem with updating database after creating the migration. While I type command: dotnet ef database update , I get error: Column names in each table must be unique. Column name 'PortalUserId' in table 'Adverts' is specified more than once. I think the problem is with my model structure, but I do not know what I am doing wrong. When I was developing with ASP.NET MVC 5 everything was Ok. Here is my Model

问题 I have a horrible database model (in MySQL though I don't think that matters) that someone else designed so I'm stuck with it, but want to use with Entity Framework with it anyway: Database Item ASSET_ID* ASSET_NAME FIELDS_ID 1 Cat 1 2 Dog 2 3 Fish 3 ItemFields ID* CUSTOMFIELD1ID CUSTOMFIELD2ID CUSTOMFIELD3ID 1 1001 1002 1003 2 1004 1005 1006 3 1007 1008 1009 Field ID* STRINGVAL 1001 Meow Mix 1002 House 1003 5lbs 1004 Kibble 1005 Yard 1006 30lbs 1007 Fish Food 1008 Tank 1009 0.5 ounces

问题 I have two IEnumerable collections that I would like to union. One selects news objects that are associated with a particular category. When a user is filtering by a category I would also like news articles that have been tagged with another category to be displayed. So I have another query that returns news objects that are tagged with the particular sub category. Now I would like to union the two collections, removing duplicates (as a news article associated to the main category, may also

问题 I'm running into some problems departing from convention using Entity Framework 6, Code First Fluent API. A classic example is that I have an entity called Software. I don't want the db table to be called Softwares. It should be called Software. But there are a few other departures as well. The problem is, 2 columns are being created for a foreign key where only 1 should be. For example, in my domain, the is a 1:m relationship between SoftwareFiles and Software. (The logic being that there