EF - Check Object Existence

CSharp · Console

/Program.cs

// @nuget: EntityFramework
// @nuget: Z.EntityFramework.Extensions

using System;
using System.Data.Entity;
using System.Linq;
using System.Collections.Generic;
					
public class Program
{
	public static void Main()
	{
		// BulkInsert: INSERT all entities in the database.
		using (var context = new EntityContext())
		{
			context.BulkInsert(Data());
		}
		
		// Query data
		using (var context = new EntityContext())
		{
			if(context.Customers.Any(c => c.CustomerID == 1))
    		{
        		Console.WriteLine("Object exists");
    		} 
		}
	}
	
	public static List<Customer> Data() 
	{
		List<Customer>  list = new List<Customer>();
		
		for(int i = 0; i < 1000; i++)
		{
			list.Add(new Customer() { Name ="Customer_" + i});
		}
		
		return list;
	}

	public class EntityContext : DbContext
	{
		public EntityContext() : base(FiddleHelper.GetConnectionStringSqlServer())
		{

		}
		
		public DbSet<Customer> Customers { get; set; }
	}
	
	
	public class Customer
	{
		public int CustomerID { get; set; }
		public string Name { get; set; }
	}
}