C# (CSharp) Eventargs Examples

Programming Language: C# (CSharp)

Class/Type: Eventargs

Examples at hotexamples.com: 4

EventArgs is a class in C# that is used to pass event data from an event handler to the event subscribers. It serves as a base class for creating classes that contain event data. The package library for EventArgs is System.

Example 1: Handling Button Click Event

In this example, a button click event is handled using EventArgs. The handler method is called when the button is clicked. The EventArgs parameter is used to pass event data to the handler method.

private void button1_Click(object sender, EventArgs e)
{
    // event handler code
}

Example 2: Custom Event Data

In this example, a custom event data class is created by deriving from EventArgs. The class contains some properties that can be used to pass data to the event subscribers.

public class CustomEventArgs : EventArgs
{
    public string Message { get; set; }
    public int Number { get; set; }
}

public class SomeClass
{
    public delegate void CustomEventHandler(object sender, CustomEventArgs e);
    public event CustomEventHandler CustomEvent;

    public void DoSomething()
    {
        CustomEventArgs args = new CustomEventArgs();
        args.Message = "Hello";
        args.Number = 42;

        OnCustomEvent(args);
    }

    protected virtual void OnCustomEvent(CustomEventArgs e)
    {
        CustomEvent?.Invoke(this, e);
    }
}

// subscribe to the event
SomeClass obj = new SomeClass();
obj.CustomEvent += CustomEventHandlerMethod;

private void CustomEventHandlerMethod(object sender, CustomEventArgs e)
{
    Console.WriteLine(e.Message);
    Console.WriteLine(e.Number);
}

In this example, a custom event data class is created by deriving from EventArgs. The class contains two properties - Message and Number. An event is defined in the SomeClass class that uses the custom event data class. The object of SomeClass is created and an event subscriber method is defined that receives the event data when the custom event is fired. The OnCustomEvent method is used to raise the event and pass the event data.

C# (CSharp) Eventargs - 4 examples found. These are the top rated real world C# (CSharp) examples of Eventargs extracted from open source projects. You can rate examples to help us improve the quality of examples.

Example #1

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 void onLoadedEvent(Object Sender, Eventargs e)
 {
     myFirstPage = this;
 }

Example #2

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File: 1282000-34359110-106713178-2.cs Project: shendongnian/download4

 // your button handler
 private void button1_Clicked(object sender, Eventargs e)
 {
     OnButtonClicked();
 }

Example #3

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    public void lbx_SelectedIndexChanged(Object sender, Eventargs e)
    {
        ListBox tmp = (ListBOx)sender;

        lb.Text = tmp.Text + "is chosen!";
    }

Example #4

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File: 1738278-50437747-173823961-6.cs Project: shendongnian/code

 private async void onLoadingData(object sender, Eventargs args)
 {
     JobListing.ItemsSource = await client.GetJobs();
 }