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Usage of HasNoDiscriminator in EFCore


By : A V
Date : September 12 2020, 06:00 AM
seems to work fine I am working on EntityFrameworkCore.Cosmo provider and encountered HasNoDiscriminator method. , It's a Cosmos-specific model customization.
code :


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EFCore can't understand many to many


By : user9375391
Date : March 29 2020, 07:55 AM
it fixes the issue Documentation says it all: Many-to-many relationships without an entity class to represent the join table are not yet supported.
However, you can represent a many-to-many relationship by including an entity class for the join table and mapping two separate one-to-many relationships.

Whats the difference between EFCore.Tools and EFCore.Tools.DotNet


By : Ulan
Date : March 29 2020, 07:55 AM
Hope this helps Microsoft.EntityFrameworkCore.Tools are tools for use with the Package Manager Console (PMC) inside Visual Studio. Includes Scaffold-DbContext, Add-Migration, and Update-Database.
Microsoft.EntityFrameworkCore.Tools.DotNet are for use with .NET Core, specifically the dotnet.exe command line tool.

Save CodeFirst's property to Base64 string in EFCore but read back X509Certificate2 from EFCore?


By : A Christo
Date : March 29 2020, 07:55 AM
Hope that helps One approach would be to add an additional not mapped property that will return the X509Certificate2 object that will be created out of the Base64 string that was read from database. Therefore the CertificateString property is used only to save and read from data context and the Certificate property is for usage in your other logic.
code :
public class ThirdParty
{
    private X509Certificate2 _certificate;



    public Guid ThirdPartyId { get; set; }

    // to write in data context only - only set it in production code
    public string CertificateString 
    {
        get
        {
            // return the Base64 string - is just pseudo code
            return _certificate?.ToString();
        }    
        set
        {
            _certificate = new X509Certificate2(value);
        }
    }

    // not mapped for data context - to read from data context only - only read fro
    public X509Certificate2 Certificate
    {
        get
        {
            if (string.IsNullOrWhiteSpace(CertificateString))
            {
                return default(X509Certificate2);
            }

            return new X509Certificate2(CertificateString);
        }    
        private set
        {
            // will be set by CertificateString
        }
    }

    public string RawData { get; set; }

    public DateTime CreatedDate { get; set; }
}

One-to-one relationship with EFCore 2.1


By : Devdas Kamath
Date : March 29 2020, 07:55 AM
I wish this helpful for you The following code was working with EFCore 2.0. , I have solved it by adding OwnsOne:
code :
builder.Entity<Entity1>(b =>
{
    b.HasKey(e => e.Id);
    b.Property(e => e.Id).ValueGeneratedNever();
    b.OwnsOne<Entity2>(e => e.Metadata);
    b.HasOne<Entity2>(e => e.Metadata)
        .WithOne(e => e.Main)
        .HasForeignKey<Entity2>(e => e.Id);
    b.ToTable("Table_Entity1");
});

builder.Entity<Entity2>(b =>
{
     b.HasKey(e => e.Id);
     b.ToTable("Table_Entity2");
});

Could I use use EfCore as ORM for WPF Project


By : Eugenia Diaz
Date : March 29 2020, 07:55 AM
seems to work fine I found solution. You should update Vs 2017 to install NetStandard 2 then you could install EfCore .
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