MySQL TIMESTAMPDIFF() to .NET 6 LINQ Conversion

In .NET 6, you can use Entity Framework Core to write LINQ queries. Here's an example of converting a MySQL query to a .NET 6 LINQ statement:

using Microsoft.EntityFrameworkCore;
using System;

public class MyDbContext : DbContext
{
    public DbSet<MyEntity> MyEntities { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseMySQL("your_connection_string");
    }
}

public class MyEntity
{
    public int Id { get; set; }
    public DateTime StartDateTime { get; set; }
    public DateTime EndDateTime { get; set; }
}

public class Program
{
    public static void Main()
    {
        using (var context = new MyDbContext())
        {
            var minutesDiff = context.MyEntities
                .AsEnumerable()
                .Select(e => (int)(e.EndDateTime - e.StartDateTime).TotalMinutes)
                .FirstOrDefault();
                
            Console.WriteLine(minutesDiff);
        }
    }
}

This code assumes you have created an entity class called MyEntity and mapped it to a table in your database. In the LINQ query, we use the AsEnumerable() method to retrieve the query from the database into memory for calculation, then use the Select() method to calculate the time difference, and finally use the FirstOrDefault() method to get the first result.

Note that you need to replace your_connection_string with your own MySQL connection string and adjust it according to your specific situation.