GetAll<T> only supports an entity with a single [Key] or [ExplicitKey] property. [Key] Count: 0, [ExplicitKey] Count: 2

[gandarez]

[Table("MyTable")]
public class TableEntity
{
    [ExplicitKey]
    public string Name { get; set; }
    [ExplicitKey]
    public Guid Id { get; set; }
}

The error happens when calling

return await GetAllAsync<MyTable>();

[winhoals]

me too

[jakehockey10]

I'm running into this as well. I have a table with a composite key. Hope this gets some attention soon.

[SuperJMN]

I've got this problem, too

[sk0va]

Same issue

[asilvestrosipos]

Same problem

[corsantic]

using Dapper.Contrib.Extensions;

[Table("MyTable")]
public class TableEntity
{
    [Key]
    public Guid Id { get; set; }
 
    public string Name { get; set; }
}

Check your library of the [ExplicitKey] and try adding [Key] to Guid only.

Library of the key must be Dapper.Contrib.Extensions;