Unable to cast object of type 'system.double' to type 'system.single'.

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i recive this message when i run the below code.

What I have tried:

var querybase = this.GetAll(
                _ => _.PlanoServico,
                _ => _.Escola
                );
				
public virtual IQueryable<T> GetAll(params Expression<Func<T, object>>[] includes)
{
	IQueryable<T> query = ctx.Set<T>();
	return includes.Aggregate(query, (current, include) => current.Include(include)).AsNoTracking();
}

Posted 16-Jun-20 6:00am

Fernando_Costa

Updated 16-Jun-20 23:36pm

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Richard Deeming 16-Jun-20 15:51pm

Do you get the error without any includes? I suspect there may be a mapping error between your database and your EF entities.

Fernando_Costa 16-Jun-20 16:03pm

I have a field float when i comment the field works

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Richard Deeming · Accepted Answer · 2020-06-16T23:37:00

Solution 1

The float type in C# maps to the real column type in SQL:
SQL Server Data Type Mappings - ADO.NET | Microsoft Docs[^]

Confusingly, the float data type in SQL maps to the double type in C#.

You'll need to modify your C# property to use the correct type that maps to the SQL column type.

Posted 16-Jun-20 23:37pm

Richard Deeming