Trigger control's event programmatically in C#

Trigger control's event programmatically in C#

In C#, you can trigger an event programmatically by calling the event handler method. Here's an example:

Suppose you have a class with an event defined like this:

public class MyClass { public event EventHandler MyEvent; public void DoSomething() { // Do some work... // Trigger the event OnMyEvent(); } protected virtual void OnMyEvent() { MyEvent?.Invoke(this, EventArgs.Empty); } }

To trigger the event programmatically, you can simply call the OnMyEvent method from your code:

var myObj = new MyClass(); myObj.MyEvent += MyEventHandler; // Subscribe to the event myObj.DoSomething(); // This will trigger the event

In this example, MyEventHandler is a method that will be executed when the MyEvent is raised:

private void MyEventHandler(object sender, EventArgs e) { // Handle the event here }

Note that it's important to check if the event is null before invoking it to avoid null reference exceptions. This is done using the null-conditional operator (?.) as shown in the OnMyEvent method above.

Examples

  1. "C# programmatically trigger Button Click event"

    • Description: Learn how to programmatically trigger the Click event of a Button control in C#.
    • Code:
      button.PerformClick();

  2. "C# trigger TextBox TextChanged event programmatically"

    • Description: Programmatically invoke the TextChanged event of a TextBox control in C#.
    • Code:
      textBox.Text = "New Value"; textBox.RaiseEvent(new TextChangedEventArgs(TextBox.TextChangedEvent, UndoAction.None));

  3. "C# programmatically fire ComboBox SelectedIndexChanged event"

    • Description: Fire the SelectedIndexChanged event of a ComboBox control programmatically in C#.
    • Code:
      comboBox.SelectedIndex = newIndex; comboBox_SelectedIndexChanged(comboBox, EventArgs.Empty);

  4. "C# trigger DataGridView CellClick event programmatically"

    • Description: Programmatically trigger the CellClick event of a DataGridView control in C#.
    • Code:
      dataGridView.Rows[0].Cells[0].Selected = true; dataGridView_CellClick(dataGridView, new DataGridViewCellEventArgs(0, 0));

  5. "C# fire ListBox SelectedIndexChanged event programmatically"

    • Description: Invoke the SelectedIndexChanged event of a ListBox control programmatically in C#.
    • Code:
      listBox.SelectedIndex = newIndex; listBox_SelectedIndexChanged(listBox, EventArgs.Empty);

  6. "C# programmatically trigger RadioButton CheckedChanged event"

    • Description: Programmatically trigger the CheckedChanged event of a RadioButton control in C#.
    • Code:
      radioButton.Checked = true; radioButton_CheckedChanged(radioButton, EventArgs.Empty);

  7. "C# trigger CheckBox CheckedChanged event programmatically"

    • Description: Fire the CheckedChanged event of a CheckBox control programmatically in C#.
    • Code:
      checkBox.Checked = true; checkBox_CheckedChanged(checkBox, EventArgs.Empty);

  8. "C# programmatically invoke LinkLabel LinkClicked event"

    • Description: Programmatically invoke the LinkClicked event of a LinkLabel control in C#.
    • Code:
      linkLabel.Links[0].Visited = true; linkLabel_LinkClicked(linkLabel, new LinkLabelLinkClickedEventArgs(linkLabel.Links[0]));

  9. "C# trigger TreeView AfterSelect event programmatically"

    • Description: Trigger the AfterSelect event of a TreeView control programmatically in C#.
    • Code:
      treeView.SelectedNode = treeView.Nodes[0]; treeView_AfterSelect(treeView, new TreeViewEventArgs(treeView.SelectedNode));

  10. "C# programmatically fire DateTimePicker ValueChanged event"

    • Description: Programmatically invoke the ValueChanged event of a DateTimePicker control in C#.
    • Code:
      dateTimePicker.Value = DateTime.Now; dateTimePicker_ValueChanged(dateTimePicker, EventArgs.Empty);

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