Expression of type 'Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1[System.Boolean]' cannot be used for return type 'System.Collections.Generic.IEnumerable`1[System.Object]'

EF Core version: 5.0.9 Database provider: Npgsql.EntityFrameworkCore.PostgreSQL 5.0.7 Target framework: .NET 5.0 Operating system: Windows 10 IDE: Visual Studio 2019

I am working with Dynamic Linq, when working with strings I have no problems, when dealing with bool’s, i got the following error:

Expression of type ‘Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable1[System.Boolean]' cannot be used for return type 'System.Collections.Generic.IEnumerable1[System.Object]’

For testing purpuses I wrote three cases:

        IQueryable iQueryable = dbContext.MyEntity.AsQueryable();
        var one = iQueryable.Select("MyBooleanField").Distinct();
        var two = iQueryable.Select("MyBooleanField").Distinct().Cast<object>();
        var three = iQueryable.Select("MyBooleanField").Distinct().Cast<bool>();

one and three work fine, two leads to the above exception. What’s the problem? I made a sample: EF-Test.zip

[ajcvickers]

@emaborsa As @roji said, please attach a small, runnable project or post a small, runnable code listing that reproduces what you are seeing so that we can investigate.

[roji]

@emaborsa it’s not quite clear what you’re doing here (e.g. where does the Select overload with a string argument come from?). Can you please submit a runnable code sample rather than a fragment?