Store files in database using Entity Framework Core

.net c# entity-framework-core sql-server


How to store files in a SQL Server database using Entity Framework Core (Code-First) in an ASP.NET Core app?

I have tried using Filestream but unfortunately I get this error:

Cannot call Property for the property 'Avatar' on entity type 'UserProfile' because it is configured as a navigation property. Property can only be used to configure scalar properties

Here's the code:

public class UserProfile : BaseEntity {
    public FileStream Avatar { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime DateOfBirth { get; set; }
    public Sex Sex { get; set; }
    public string Address { get; set; }
    public string PhoneNumber { get; set; }

    public virtual IEnumerable<Email> Emails { get; set; }
    public virtual User User { get; set; }
    public int UserID { get; set; }

And mapping:

public class UserProfileMap {
    public UserProfileMap(EntityTypeBuilder<UserProfile> entityBuilder) {
        entityBuilder.HasKey(e => e.ID);
        entityBuilder.Property(e => e.Avatar);
        entityBuilder.Property(e => e.FirstName);
        entityBuilder.Property(e => e.LastName);
        entityBuilder.Property(e => e.DateOfBirth);
        entityBuilder.Property(e => e.Sex);
        entityBuilder.Property(e => e.Address);
        entityBuilder.Property(e => e.PhoneNumber);
        entityBuilder.HasMany(e => e.Emails).WithOne(u => u.UserProfile).HasForeignKey(x => x.UserProfileID);

What do I do? Thanks!

2/17/2018 9:33:21 PM

Accepted Answer

You can convert the file bytes to a byte array.

public byte[] Avatar { get; set; }

Examine the accepted answer in the analogous approach for EF6: Save and retrieve image (binary) from SQL Server using Entity Framework 6

2/17/2018 8:03:54 PM

Popular Answer

I am assuming that you are trying to use the windows filestream for sql server, which is not yet supported by .NET Core. You have to store the file as a byte array as already said (which will convert to varbinary(max) in sql server) and copy the file content over when uploading using a memory-stream for instance.

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