在C＃的Try块中，如果要在我的textbock中输入一个int，我想引发异常的catch部分吗？

Question

So if you push the enter button, and the user enters a number i want the program to throw out a exception that no integers may be entered in the text block.

    private void btnEnter_Click(object sender, RoutedEventArgs e)
    {         
        try
        {
            string[] words = { txtInfo.Text };

            foreach (string f in words)
            {
                lstResults.Items.Add(f);
            }
            txtInfo.Text = "";  
        }
        catch (Exception ex)
        {

        }   
    }

Very small project for school but would like to specify the exception.

Answer 1

the best way to do this is to implement Guard Clauses. Guard Clause is just a simple checking of the input parameters at the top of your method.

I would totally remove try catch from your code and just check if the text in the box is an integer.

private void btnEnter_Click(object sender, RoutedEventArgs e)
    {   
        //this will check if the text from the box can be parsed as an integer then
        //exit this method but show message box with your message.      
        if(int.TryParse(txtInfo.Text, out var test)
         {
             MessageBox.Show("Integers are not allowed");
             return; 
          }
            string[] words = { txtInfo.Text };

            foreach (string f in words)
            {
                lstResults.Items.Add(f);
            }
            txtInfo.Text = "";  

    }

I hope this helps.