EnitityFramework is very slow to compare strings because create a nvarchar sqlparameter instead of varchar

Question

I have this sample query:

context.BarcodeTipiDoc.AsQueryable().Where(d => d.Barcode.CompareTo(minBarcode) > 0);
         


        

Answer 1

In your column mapping, you originally declared this:

[Column("Barcode", TypeName = "varchar(21)")]   
public string Barcode { get; set; }

Can you try this:

[Column(TypeName = "VARCHAR(21)")]
public string Barcode { get; set; }

Or you can specify in the Model Builder:

modelBuilder.Entity()
            .Property(x=> x.BarCode)
            .HasColumnType("varchar(21)");

It would also help if you could post the model for your object BarcodeTipiDoc.

Update: Just saw that you were using EF Core.