EFE - Temporary Table - ResolvedTemporaryTableName (EF Core)

CSharp · Console

/Program.cs

// Entity Framework Extensions
// Doc: https://entityframework-extensions.net/temporary-table#resolvedtemporarytablename

// @nuget: Microsoft.EntityFrameworkCore.SqlServer
// @nuget: Z.EntityFramework.Extensions.EFCore

/*
## 🏷️ ResolvedTemporaryTableName

Gets the final temporary table name used during the operation (whether it was automatically generated or explicitly provided).

This option is especially useful when combined with [`TemporaryTablePersist`](#temporarytablepersist), since the temporary table remains available after the operation and you may want to query it directly.

### 💡 Why it can be useful

* **Debugging** → Know exactly which table was created during the operation.
* **Custom queries** → When using `TemporaryTablePersist`, you can run queries directly on the temporary table.
* **Future operations** → Reuse the persisted temporary table data for later queries or other bulk operations.
* **Logging & monitoring** → Capture the resolved name for auditing or troubleshooting.
*/

using System;
using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;
using Microsoft.Data.SqlClient;

public class Program
{
	public static void Main()
	{
		using (var context = new EntityContext())
		{
			context.Database.EnsureCreated();
		}
		
		using (var context = new EntityContext())
		{
			// open the connection first to be able to access the temporary table data later
			context.Database.OpenConnection();
			
			// minimum 11 customers to use a temporary table
			var customers = GenerateCustomer(11);

			string temporaryTableName = "";

			context.BulkMerge(customers, options =>
			{
				options.TemporaryTablePersist = true;

				options.BulkOperationExecuted = op =>
				{
					// Capture the resolved temporary table name after execution
					temporaryTableName = op.ResolvedTemporaryTableName;
				};
			});
			
			Console.WriteLine($"Temporary table created: {temporaryTableName}");
			
			FiddleHelper.WriteTable(context.Customers.AsNoTracking());
		}
	}
		 	
	public static List<Customer> GenerateCustomer(int max)
	{
		var list = new List<Customer>();
		for (int i = 0; i < max; i++)
		{
			list.Add(new Customer() { Name ="Customer_" + i});
		}
		
		return list;
	}

	public class EntityContext : DbContext
	{
		public EntityContext() 
		{
		}

		protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
		{
			optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

			base.OnConfiguring(optionsBuilder);
		}
		
		public DbSet<Customer> Customers { get; set; }
	}
	
	
	public class Customer
	{
		public int CustomerID { get; set; }
		public string Name { get; set; }
		public Boolean IsActive { get; set; }
	}
}