How do I set multiple button texts using loop?

Question

How do I set multiple button texts using loop?

Skysmith 146

I am making a C# WPF program with 100 buttons.
I want the program to read Settings and change the button names when it is launched.

This is my current code:

public void SetButtonName()  
{  
    Btn_1.Content = Settings.Default.ButtonName[1];  
    Btn_2.Content = Settings.Default.ButtonName[2];  
    Btn_3.Content = Settings.Default.ButtonName[3];  
    .  
    .  
    .  
    Btn_99.Content = Settings.Default.ButtonName[99];  
    Btn_100.Content = Settings.Default.ButtonName[100];  
}

I have a feeling there is a way to make this shorter using loop, but I cannot figure this out after a few days of searching the Internet.
Any help would be really appreciated.

Accepted answer

2 additional answers

Your answer

Answer 1

Castorix31 90,686

You can enumerate child controls with VisualTreeHelper
and in the loop you can test :

            if (childVisual is Button)  
            {  
                ((Button)childVisual).Content = "Your text";  
            }

Skysmith 146

It took me some time to understand how to use VisualTreeHelper, but I finally figured it out. Thank you.

This is the final code just in case anyone is wondering:

// Enumerate all the descendants of the visual object.  
static public void EnumVisual(Visual myVisual)  
{  
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(myVisual); i++)  
    {  
        // Retrieve child visual at specified index value.  
        Visual childVisual = (Visual)VisualTreeHelper.GetChild(myVisual, i);  

        // Do processing of the child visual object.  
        if (childVisual is Button button && button.Name.StartsWith("Btn_"))  
        {  
            button.Content = Settings.Default.ButtonName[int.Parse(button.Name.Substring(4))];  
        }  

        // Enumerate children of the child visual object.  
        EnumVisual(childVisual);  
    }  
}

Answer 2

Peter Fleischer (former MVP) 19,341

HI,
try following code. stp is the name of StackPanel with Buttons:

public void SetButtonName()  
{  
  foreach (Button item in stp.Children)  
    if (item.Name.StartsWith("Btn_"))  
      item.Content= Settings.Default.ButtonName[int.Parse(item.Name.Substring(4))];  
}

Skysmith 146 Reputation points

2022-06-09T18:09:03.173+00:00

Is there a way to use this code when there is a mixture of objects in the StackPanel?

I am getting:

System.InvalidCastException: 'Unable to cast object of type 'System.Windows.Shapes.Rectangle' to type 'System.Windows.Controls.Button'.'
laurentcutey-3677 16 Reputation points

2022-06-09T18:40:10.747+00:00

Use the official method from Microsoft with VisualTreeHelper. It is recursive

Peter Fleischer (former MVP) 19,341

Hi,
if you have different controls on different places in window you can use VisualTreeHelper:

public void SetButtonName(Visual vis)  
{  
  for (int i = 0; i < VisualTreeHelper.GetChildrenCount(vis); i++)  
  {  
    Visual childVis = (Visual)VisualTreeHelper.GetChild(vis, i);  
    Button btn = childVis as Button;  
    if (btn != null && btn.Name.StartsWith("Btn_"))  
      btn.Content = Settings.Default.ButtonName[int.Parse(item.Name.Substring(4))];  
    SetButtonName(childVis);  
  }  
}

To call this method for whole window (x:Name="wnd"):

  SetButtonName(wnd);

Answer 3

You could try to see the example below.

  public void SetButtonName()  
        {  
          foreach (UIElement item in stp.Children)  
          {  
            if (item.GetType() == typeof(TextBox))  
            {  
              TextBox txt = (TextBox)item;  
              txt.Text="44";  
            }  
            if (item.GetType() == typeof(Button))  
            {  
              Button btn = (Button)item;  
              btn.Content="55";  
            }  
            if (item.GetType() == typeof(Rectangle))  
            {  
              Rectangle rect = (Rectangle)item;  
               rect.Fill = new SolidColorBrush(System.Windows.Media.Colors.AliceBlue);  
            }  
          }  

          //item.Content = Settings.Default.ButtonName[int.Parse(item.Name.Substring(4))];  
        }

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How do I set multiple button texts using loop?

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