Reducing Code With Anonymous Functions

Jefferson S. Motta

Anonymous functions, in a simple way, are functions that can be activated directly without declaring his name, as his own name says "anonymous".

This technic works in C# projects, .NET Framework, .NET Core or WPF and can be used to reduce code, on this POST I attached a sample of using anonymous X common (regular) way.

The final result is a reduced code and fast startup.

The common way

Below is a regular code for fired Click events. To run this Form there is extra code in FormCommon.Designer.cs.

FrmCommon.cs

using System;
using System.Windows.Forms;
namespace AnonymousEventsForClick
{
public partial class FrmCommon : Form
{
public FrmCommon()
{
InitializeComponent();
}
private void menu1ToolStripMenuItem_Click(object sender, EventArgs e)
{
// Your code
// CODE xyz
var n = 0;
APIProject.Print(++n);
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
APIProject.CheckStatus();
}
private void button1_Click(object sender, EventArgs e)
{
// Sample to access the object
if (!(sender is Button)) return;
APIProject.OpenDocument();
}
}
}

FrmCommon.Desingner.cs

Extra code

...

this.menu1ToolStripMenuItem.Click += new System.EventHandler(this.menu1ToolStripMenuItem_Click);

...

this.button1.Click += new System.EventHandler(this.button1_Click);

...

this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged);

...

The Anonymous way

Below is the same code with anonymous functions to fire events, with fewer functions, lines, and usings. There is no extra code in FrmAnonymous.Designer.cs.

using System.Windows.Forms;
namespace AnonymousEventsForClick
{
public partial class FrmAnonymous : Form
{
public FrmAnonymous()
{
InitializeComponent();
menu1ToolStripMenuItem.Click += (s, e) =>
{
// You can add your code in the body
// CODE xyz
var n = 0;
APIProject.Print(++n);
};
checkBox1.CheckedChanged += (s, e) => { APIProject.CheckStatus(); };
button1.Click += (s, e) =>
{
// Sample to access the object
if (!(s is Button)) return;
APIProject.OpenDocument();
};
}
}
}

CONCLUSION

Using this technic you can reduce code and organize it in a single place.

Anonymous functions can be used to any kind of Events, this sample shows only for the Click event.

Happy coding.

3 Comments

Join the conversation! Your thoughts help the community grow.

Sourav Kumar Das7y ago
Superb Article Sir.
Praneet Rane7y ago
Nice information!
Hari Murugesan7y ago
Nice Article