How to implement Interface in Mainwindow

Hi,

I'm rewriting my project, so it's easier to edit in future, and want to implement interface.

I've implemented the interface, but it doesn't work in MainWindow, I'm not able to call the method.

So I've tried to use the PalindromeChecker as the default implementation PalindromeChecker = new PalindromeChecker(); , so I can call the method but it didn't work.

interface ICheckPalindrome
{
bool IsPalindrome(string text);
}
public class PalindromeChecker : ICheckPalindrome
{
///
/// Method for checking if the word/text is a palindrome.
///
public bool IsPalindrome(string text)
{
......
//Code
}
}
}
namespace TextChecker
{
///
/// Interaction logic for MainWindow.xaml
///
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
lblInput.Foreground = Brushes.ForestGreen;
lblResult.Foreground = Brushes.ForestGreen;
lblTitel.Foreground = Brushes.ForestGreen;
}
///
/// User input and checking the input if the word a palindrome is.
///
private void InputText_TextChanged(object sender, TextChangedEventArgs e)
{
string text = InputText.Text;
bool isPalindrome = PalindromeChecker.IsPalindrome(text);
OutputText.Text = text + (isPalindrome ? " is a palindrome" : " is NOT a palindrome");
if (InputText.Text == string.Empty)
{
OutputText.Clear();
}
}
private void ButtonClicked(object sender, RoutedEventArgs e)
{
SubWindow subWindow = new SubWindow();
subWindow.Show();
}
}
}
public class PalindromeChecker : ICheckPalindrome
{
///
/// Method for checking if the word/text is a palindrome.
///
public bool IsPalindrome(string text)
{
int min = 0;
int max = text.Length - 1;
while (true)
{
if (min > max)
{
return true;
}
char a = text[min];
char b = text[max];
if (a != b)
{
return false;
}
min++;
max--;
}
}
}

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Rajanikant Hawaldar7y ago
Hi Kil Gore

Learn MVVM with implementing interface

https://www.c-sharpcorner.com/uploadfile/yougerthen/a-simple-concretization-of-mvvm-pattern/

https://www.codeproject.com/Articles/1168907/A-Real-MVVMLight-Example

https://csharperimage.jeremylikness.com/2010/04/model-view-viewmodel-mvvm-explained.html

Thanks
Kil Gore7y ago
The answer is simple:

I needed to create instance so I could use it:
ICheckPalindrome checker = new PalindromeChecker();
Kil Gore7y ago
Hi,

As you can see im new to WPF, so that's why I'm not using MVVM Pattern , I've been trying to find good tutorial. Could you maybe link me one ?

Thanks,
Mario Scheeren7y ago
Since you are using WPF, you should use Pattern MVVM, too.
The stuff you do is mixing Windows Forms with WPF, really bad style (sorry to say - but only noobs do).
So if using MVVM Pattern you will be easily be able to add your Pallindrome-Checking there.