Monthly Archives: December 2009

Enabling Edit and Continue on 64-bit machines.

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Ever had this error?

changes to 64-bit applications are not allowed

changes to 64-bit applications are not allowed

This occurs on 64-bit machines when trying to do Edit and Continue (a feature of the .NET CLR) on a 64-bit application.

It’s only available on 32-bit applications.

Now it’s up to the reader to determine if he needs a 64-bit application. 95% of the time the answer will be no.

So for those people I present the solution:

image

It’s quite simple. Go to properties, build and set the platform target to x86. And you’re ready to go Edit and Continue.

Please do read this about Edit and Continue.

SqlConnection, Close and deconstructor: Internal .Net Framework Data Provider error 1.

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Today I experienced the following issue:

I had a class where I would open a SqlConnection, do some actions, and then in the deconstructor I closed the SqlConnection.

~Dumper()
{
    this._sqlConnection.Close();
}

Unfortunately every time my program ran it stopped with this error:

image

Internal .Net Framework Data Provider error 1.

(click to enlarge)

Well it seems that you cannot close a SqlConnection in a ~Deconstructor block.

So the solution is implementing the IDisposable interface

internal class Dumper : IDisposable
{
    private readonly SqlConnection _sqlConnection;

    public Dumper()
    {
        //build and open the connection
        this._sqlConnection = new SqlConnection(Settings.Default.ConnectionString);
        this._sqlConnection.Open();
    }

    /// <summary>
    /// Some function
    /// </summary>
    /// <param name="param">param</param>
    public void SomeFunction(SomeParameter param)
    {
    }

    public void Dispose()
    {
        this._sqlConnection.Close();
    }
}

And to use it you do this:

using (Dumper dumper = new Dumper())
{
    dumper.SomeFunction(myParam);
}

This will cause dumper to be Disposed after the } and it will no longer be available

.NET 3.5 pager, generate pages from List<T>

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A friend of mine asked me to generate pages from a List<T>. This is my implementation:

using System;
using System.Collections.Generic;
using System.Linq;

namespace Pager
{
    static class Program
    {
        static void Main()
        {
            List<int> list = new List<int>();

            //add 26 items
            for (int x = 0; x < 26; x++)
            {
                list.Add(x);
            }

            //generate pages
            List<int>[] pagesList = Pager<int>(list, 4);

            Console.WriteLine("Please examine pagesList");
            System.Diagnostics.Debugger.Break();

        }

        /// <summary>
        /// Converts a collection of T to an array of pages
        /// </summary>
        /// <typeparam name="T">The type of items in the list, can be inferred most of the time</typeparam>
        /// <param name="list">The list to page</param>
        /// <param name="itemsPerPage">Items per page</param>
        /// <returns>An array of lists, pages if you will</returns>
        static List<T>[] Pager<T>(ICollection<T> list, int itemsPerPage)
        {
            int pages = (int)Math.Ceiling((double)list.Count / itemsPerPage);

            List<T>[] pagesList = new List<T>[pages];

            for (int currentPage = 0; currentPage < pages; currentPage++)
            {
                pagesList[currentPage] = list.Skip(currentPage * itemsPerPage).Take(itemsPerPage).ToList();
            }

            return pagesList;
        }
    }
}