entity-framework

问题 I have my entities like this, they are closely linked. public class Game { public int Id { get; set; } public int FirstTeamId { get; set; } public Team FirstTeam { get; set; } public int SecondTeamId { get; set; } public Team SecondTeam { get; set; } public Stadium Stadium { get; set; } public DateTime Date { get; set; } public GameStatus Result { get; set; } public Game(DateTime date , GameStatus result ) { Date = date; Result = result; } } public class Player { public int Id { get; set; }

问题 I have my entities like this, they are closely linked. public class Game { public int Id { get; set; } public int FirstTeamId { get; set; } public Team FirstTeam { get; set; } public int SecondTeamId { get; set; } public Team SecondTeam { get; set; } public Stadium Stadium { get; set; } public DateTime Date { get; set; } public GameStatus Result { get; set; } public Game(DateTime date , GameStatus result ) { Date = date; Result = result; } } public class Player { public int Id { get; set; }

问题 public class OrderItem { public int OrderID { get; set; } public int ProductionID { get; set; } } public class InventoryItem { public int InventoryItemID{ get; set; } public int OrderID { get; set; } public int ProductionID { get; set; } public bool Created { get; set; } public bool Deleted { get; set; } } Using these example objects, I have a local list of orderItems and want to query inventory items where OrderID and ProductionID matches on both properties any of my list of Order Items I

问题 The Entity Framework uses proxy classes for some of its internal stuff, as seen in this question we have to disable it, because it cause issues with the serialization of the objects. My question is what will be the consequences if I disable the ProxyCreation globally in my project (to avoid serialization issues) ...??? 回答1: They are mainly around enabling lazy loading, but can provide some performance improvement for persisting changes, though honestly I'd say this is highly situational to

问题 I have a problem with setting up a one-to-many relation with EF Core. I have two tables address and address_country . There are schemas: As you see, I want to store countries with different locales. So it has a composed key. address table has a foreign key to address_country . Unfortunately, I cannot setup ContextDb to achieve what I want. The list of countries is not filled in Address model. I have the following code in Context : public class Context : DbContext { protected override void

问题 I want to insert some records where I specify the Id, for the purpose of migrating data where I would like to maintain the integrity of existing relationships. To do this I ran this command directly in SSMS on the table: SET IDENTITY_INSERT [CRMTItem] ON; Yet, when I insert an item from C# with Id of 1, the Id is still incrementing from around 850. I deleted the entities from EDMX and updated again from DB but with the same result. Here is my insert code, where as you can see I am ensuring

问题 I want to insert some records where I specify the Id, for the purpose of migrating data where I would like to maintain the integrity of existing relationships. To do this I ran this command directly in SSMS on the table: SET IDENTITY_INSERT [CRMTItem] ON; Yet, when I insert an item from C# with Id of 1, the Id is still incrementing from around 850. I deleted the entities from EDMX and updated again from DB but with the same result. Here is my insert code, where as you can see I am ensuring

问题 I'm working on a cloud-based line of business application. Users can upload documents and other types of object to the application. Users upload quite a number of documents and together there are several million docs stored. I use SQL Server. Today I have a somewhat-restful-API which allow users to pass in a DocumentSearchQuery entity where they supply keyword together with request sort order and paging info. They get a DocumentSearchResult back which is essentially a sorted collection of

问题 I have the following classes: public class ProductAttribute { public Guid ProductId { get; set; } public Guid AttributeId { get; set; } public List<ProductAttributeValue> Values { get; set; } public object[] GetKeys() { return new object[] {ProductId, AttributeId}; } } public class Product { public Guid Id { get; set; } public string Name { get; set; } } public class Attribute { public Guid Id { get; set; } public string Name { get; set; } } public class ProductAttributeValue { public Guid Id

问题 So, I'm having an issue with serializing my JSON object to my Entity/Model object. I have the following code snippet: var serializedValue = JsonConvert.SerializeObject(newRows, new MyModelConverter()); var csvToSave = JsonConvert.DeserializeObject<MyModel>(serializedValue); Where newRows is a List<KeyValuePair<string,string>> Where Entity looks something like this: public class MyModel: Entity { public int Id { get; set; } //primary key public DateTime TouchTime { get; set; } public DateTime