Question

I need to set the height of every textbox on my form, some of which are nested within other controls. I thought I could do something like this:

private static IEnumerator<TextBox> FindTextBoxes(Control rootControl) {     foreach (Control control in rootControl.Controls)     {         if (control.Controls.Count > 0)         {             // Recursively search for any TextBoxes within each child control             foreach (TextBox textBox in FindTextBoxes(control))             {                 yield return textBox;             }         }          TextBox textBox2 = control as TextBox;         if (textBox2 != null)         {             yield return textBox2;         }     } } 

Using it like this:

foreach(TextBox textBox in FindTextBoxes(this)) {     textBox.Height = height; } 

But of course the compiler spits its dummy, because foreach expects an IEnumerable rather than an IEnumerator.

Is there a way to do this without having to create a separate class with a GetEnumerator() method?

Answer 1

As the compiler is telling you, you need to change your return type to IEnumerable. That is how the yield return syntax works.