How Can I Efficiently Loop Through TextBoxes on Multiple Panels in a WinForms Application?

Looping Through Textboxes in a Winforms Application

In a Winforms application, you may encounter situations where you need to iterate through a collection of textboxes on the screen. Each of these textboxes may be sequentially numbered, such as:

DateTextBox0
DateTextBox1
...
DateTextBox37

To assign values to these textboxes, you could consider the following approach:

int month = MonthYearPicker.Value.Month;
int year = MonthYearPicker.Value.Year;
int numberOfDays = DateTime.DaysInMonth(year, month);

m_MonthStartDate = new DateTime(year, month, 1);
m_MonthEndDate = new DateTime(year, month, numberOfDays);

DayOfWeek monthStartDayOfWeek = m_MonthStartDate.DayOfWeek;
int daysOffset = Math.Abs(DayOfWeek.Sunday - monthStartDayOfWeek);

for (int i = 0; i <= (numberOfDays - 1); i++)
{
    // Here is where you want to loop through the textboxes and assign values based on the 'i' value
    // DateTextBox(daysOffset + i) = m_MonthStartDate.AddDays(i).Day.ToString();
}

However, your application introduces an additional layer of complexity as these textboxes are located on separate panels. To effectively loop through these controls, you can utilize an extension method:

public static IEnumerable<TControl> GetChildControls<TControl>(this Control control) where TControl : Control
{
    var children = (control.Controls != null) ? control.Controls.OfType<TControl>() : Enumerable.Empty<TControl>();
    return children.SelectMany(c => GetChildControls<TControl>(c)).Concat(children);
}

With this extension method, you can recursively retrieve all controls and sub-controls of a specified type. Usage example:

var allTextBoxes = this.GetChildControls<TextBox>();
foreach (TextBox tb in allTextBoxes)
{
    tb.Text = ...;
}

By employing this extension method, you can efficiently loop through all textboxes on your separate panels and assign values to them according to your desired logic.

The above is the detailed content of How Can I Efficiently Loop Through TextBoxes on Multiple Panels in a WinForms Application?. For more information, please follow other related articles on the PHP Chinese website!