entity-framework

问题 I've been looking for a solution to this case for hours, and I did not find anything that worked out for me. Here we use the comma for decimal separator, and when I send a value like "15,50", in my controller I get the value of the model as "1550", and it only makes sense if I send "15.50". I covered the following topics, and nothing worked. Set CultureInfo in Asp.net Core to have a . as CurrencyDecimalSeparator instead of , Aspnet Core Decimal binding not working on non English Culture I am

问题 I have a hierarchical entity, which references it self as a parent. I need to do the mapping only via ids, not via entity instances (the reason is too complicated to explain). So I defined the entity this way: class Item { @Id private String id; @ManyToOne(targetEntity = Item.class) @JoinColumn(name = "PARENT_ID", nullable = true) private String parentId; } This seems to work fine. The foreign key constraint is created correctly in database. But when I execute the following query: SELECT i

问题 I have a hierarchical entity, which references it self as a parent. I need to do the mapping only via ids, not via entity instances (the reason is too complicated to explain). So I defined the entity this way: class Item { @Id private String id; @ManyToOne(targetEntity = Item.class) @JoinColumn(name = "PARENT_ID", nullable = true) private String parentId; } This seems to work fine. The foreign key constraint is created correctly in database. But when I execute the following query: SELECT i

问题 I have a hierarchical entity, which references it self as a parent. I need to do the mapping only via ids, not via entity instances (the reason is too complicated to explain). So I defined the entity this way: class Item { @Id private String id; @ManyToOne(targetEntity = Item.class) @JoinColumn(name = "PARENT_ID", nullable = true) private String parentId; } This seems to work fine. The foreign key constraint is created correctly in database. But when I execute the following query: SELECT i

问题 Entity Framework Core does not support spatial data, which I need to use in my app. Can I use Entity Framework 6 in .net core? If so, how can I register DatabaseContext in Startup.cs ? 回答1: No, you can not directly, because EF6 doesn't support .NET Core. But, you can create another project, that compiles against full .NET framework and use it as a reference. MS has actually made a decent tutorial for this: https://docs.microsoft.com/en-us/aspnet/core/data/entity-framework-6#reference-full

问题 How do I filter out Grandchild elements with a Linq EF Query? This Customer has multiple transactions, and only need subchild elements with Certain ProductTypeId. Its currently bringing All ProductType Ids ignoring the filter . var result = db.Customer .Include(b => b.Transactions) .Where(a => a.Transactions.Select(c=> c.ProductTypeId== productTypeId).Any()) Sql query, that I want: select distinct c.customerName from dbo.customer customer inner join dbo.Transactions transaction on transaction

问题 I have the below model. What is the better way to load the parent entity with child entity at the time of fetching from the DB with find method? Parent Entity: public class Client { public int Id { get; set; } public string LastName { get; set; } public string Gender { get; set; } public DateTime DateOfBirth { get; set; } public Address Address { get; set; } } Child Entity: public class Address { public int Id { get; set; } public string FirstLine { get; set; } public string SecondLine { get;

问题 When I try to register a user on my .NET Core 2.1 website (using identity) I get the following error: "InvalidOperationException: Unable to determine the relationship represented by navigation property 'City.ConnectionStartCity' of type 'ICollection'. Either manually configure the relationship, or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.". The reason this happens probably has nothing to do with identity, but

问题 When I try to register a user on my .NET Core 2.1 website (using identity) I get the following error: "InvalidOperationException: Unable to determine the relationship represented by navigation property 'City.ConnectionStartCity' of type 'ICollection'. Either manually configure the relationship, or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.". The reason this happens probably has nothing to do with identity, but

问题 When I try to register a user on my .NET Core 2.1 website (using identity) I get the following error: "InvalidOperationException: Unable to determine the relationship represented by navigation property 'City.ConnectionStartCity' of type 'ICollection'. Either manually configure the relationship, or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.". The reason this happens probably has nothing to do with identity, but