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EntityFrameworkCore.SQLLite and UWP Not behaving as expected


EntityFrameworkCore.SQLLite and UWP Not behaving as expected

By : Stuart Matthews
Date : November 26 2020, 04:01 AM
To fix this issue So i have got to the bottom of it. There is an error in the tutorial.
So the command they tell you to type is
code :


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An exception of type 'Microsoft.EntityFrameworkCore.DbUpdateException' occurred in Microsoft.EntityFrameworkCore.dll

An exception of type 'Microsoft.EntityFrameworkCore.DbUpdateException' occurred in Microsoft.EntityFrameworkCore.dll


By : Alexander Knorr
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Your problem is that at this point, c already has an Id.
With planet.Add, the planet and all coordinates attached to it will be set to Added in your DbSet's and upon calling SaveChanges, insert statements will be created. (Here I assume an autoincrement on your column and your Id property)
Microsoft.EntityFrameworkCore 2.1-rc with MySql.Data.EntityFrameworkCore

Microsoft.EntityFrameworkCore 2.1-rc with MySql.Data.EntityFrameworkCore


By : Tahsin Ertan
Date : March 29 2020, 07:55 AM
should help you out Finally, with this provider Pomelo.EntityFrameworkCore.MySql version 2.1.0-rc1-final everything works perfect. To install it execute the command: Install-Package Pomelo.EntityFrameworkCore.MySql -Version 2.1.0-rc1-final
Using EntityFrameWorkCore and SqlLite in memory I get "no such table: ControlGroup" error

Using EntityFrameWorkCore and SqlLite in memory I get "no such table: ControlGroup" error


By : Pratap Bhanu
Date : March 29 2020, 07:55 AM
Any of those help You need to keep the connection open within your test scope and create the database.
code :
public class Tests : IDisposable
{
    private readonly SqliteConnection _connection;
    private readonly DbContextOptions _options;

    public Tests()
    {
        _connection = new SqliteConnection("datasource=:memory:");
        _connection.Open();

        _options = new DbContextOptionsBuilder()
            .UseSqlite(_connection)
            .Options;

        using (var context = new MyContext(_options))
            context.Database.EnsureCreated();
    }

    public void Dispose()
    {
        _connection.Close();
    }

    [Fact]
    public void Test()
    {
        using (var context = new MyContext(_options))
        {
            // use in memory database
            context.ControlGroup ...
        }
    } 
}
Typescript Constructor Class not behaving as expected, "0 Arguments Expected"

Typescript Constructor Class not behaving as expected, "0 Arguments Expected"


By : Hoysala R
Date : March 29 2020, 07:55 AM
hope this fix your issue That's because register is important.
Constructor from capital C is not recognized as class constructor function, I think it is treated as a method.
.NET Standard 2.0 / EntityFrameworkCore / DB2 / IBM.EntityFrameworkCore issue

.NET Standard 2.0 / EntityFrameworkCore / DB2 / IBM.EntityFrameworkCore issue


By : Calgary
Date : March 29 2020, 07:55 AM
Any of those help I've solved it. It turned out that this exception happens if actual entity types (i.e. MyType) aren't defined in the same assembly (project) as the context. In my solution I had entity types defined in one project, and DbContextdefined in a different project, that references the first one, of course.
The reason for me to have such design was in the fact that there are two different packages (depending on the actual OS): IBM.EntityFrameworkCore and IBM.EntityFrameworkCore-lnx. So I've created two different projects, each referencing one of these packages. Still, I wanted to have all the entity types defined once... But obviously it cannot work like that.
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