Category Archives: Development

Example of C# delegate/event to pass data from one form to another

Posted in C# on August 2, 2017 by rowej83.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
  public partial class Form1 : Form
  {
    private Form2 Frm2 = new Form2();

    public Form1()
    {
      InitializeComponent();
      Frm2.AdviseParent += new Form2.AdviseParentEventHandler(SetFromForm2);
    }

    private void button1_Click(object sender, EventArgs e)
    {
      Frm2.ShowDialog();
    }


    public void SetFromForm2(string label)
    {
      label1.Text = label;
    }

  }
}


//Form 2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
  public partial class Form2 : Form
  {
    public delegate void AdviseParentEventHandler(string text);
    public event AdviseParentEventHandler AdviseParent;

    public Form2()
    {
      InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
      SetLabelOnForm1(textBox1.Text);
    }

    public void SetLabelOnForm1(string label)
    {
      if (AdviseParent != null)
        AdviseParent(label);
    }
  }
}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

private Form2 Frm2 = new Form2();

public Form1()

{

InitializeComponent();

Frm2.AdviseParent += new Form2.AdviseParentEventHandler(SetFromForm2);

}

private void button1_Click(object sender, EventArgs e)

{

Frm2.ShowDialog();

}

public void SetFromForm2(string label)

{

label1.Text = label;

}

//Form 2

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

public partial class Form2 : Form

{

public delegate void AdviseParentEventHandler(string text);

public event AdviseParentEventHandler AdviseParent;

public Form2()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

SetLabelOnForm1(textBox1.Text);

}

public void SetLabelOnForm1(string label)

{

if (AdviseParent != null)

AdviseParent(label);

}

C# IEnumerable notes

Posted in C# on August 1, 2017 by rowej83.

Examples of methods that must be implemented for the IEnumerable interface.

 class AnimalFarm : IEnumerable
    {
        private List<Animal> animalList = new List<Animal>();
        public AnimalFarm(List<Animal> animalList)
        {
            this.animalList = animalList;
        }

        public AnimalFarm() { }

        public Animal this[int index]
        {
            get { return (Animal)animalList[index]; }
            set { animalList.Insert(index, value); }
        }
        public int Count { get { return animalList.Count; } }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return animalList.GetEnumerator();
        }
    }

class AnimalFarm : IEnumerable

{

private List<Animal> animalList = new List<Animal>();

public AnimalFarm(List<Animal> animalList)

{

this.animalList = animalList;

}

public AnimalFarm() { }

public Animal this[int index]

{

get { return (Animal)animalList[index]; }

set { animalList.Insert(index, value); }

}

public int Count { get { return animalList.Count; } }

IEnumerator IEnumerable.GetEnumerator()

{

return animalList.GetEnumerator();

}

Git notes

Posted in Development on July 11, 2017 by rowej83.

Merge vs Rebase notes:

“In general the way to get the best of both worlds is to rebase local changes you’ve made but haven’t shared yet before you push them in order to clean up your story, but never rebase anything you’ve pushed somewhere.”

My prefered Sublime text 3 Earthsong settings

Posted in Development on February 11, 2016 by rowej83.

A PDF of a website I used to use in order to get my preferred theme in Sublime text to work. See attached.

My Earthsong Sublime Setup

C# Entity Framework snippets

Posted in C# on May 5, 2015 by rowej83.

entity-framework-cheatsheet

using (MyEntities context = new MyEntities())
{
    // Query a collection
    IQueryable<MyThing> thingsQuery = from thing in context.Things
                                      where thing.Name == "Foo"
                                      select product;
    foreach (var t in thingsQuery)
    {
        DoSomethingWith(t);
    }

    // Delete an object
    context.DeleteObject(thingsQuery.First());

    // Query for a single object, and process related objects
    var thing = context.Things.Include("Subthings").Where(o => o.ThingID.Equals("foo")).FirstOrDefault();
    if (thing != null)
    {
        foreach (var subthing in thing.Subthings)
            DoSomethingWithSubthing(subthing);
    }

    // Save changes
    try
    {
        int count = context.SaveChanges();
    }
    catch (OptimisticConcurrencyException)
    {
        context.Refresh(RefreshMode.ClientWins, things);
        context.SaveChanges();
    }
    catch (UpdateException)
    {
        // ...
    }
    catch (InvalidOperationException)
    {
        // ...
    }
}

//Source: http://undefinedvalue.com/2012/07/11/entity-framework-cheatsheet

using (MyEntities context = new MyEntities())

{

// Query a collection

IQueryable<MyThing> thingsQuery = from thing in context.Things

where thing.Name == "Foo"

select product;

foreach (var t in thingsQuery)

{

DoSomethingWith(t);

}

// Delete an object

context.DeleteObject(thingsQuery.First());

// Query for a single object, and process related objects

var thing = context.Things.Include("Subthings").Where(o => o.ThingID.Equals("foo")).FirstOrDefault();

if (thing != null)

{

foreach (var subthing in thing.Subthings)

DoSomethingWithSubthing(subthing);

}

// Save changes

try

{

int count = context.SaveChanges();

}

catch (OptimisticConcurrencyException)

{

context.Refresh(RefreshMode.ClientWins, things);

context.SaveChanges();

}

catch (UpdateException)

{

// ...

}

catch (InvalidOperationException)

{