单击xamarin时添加2按钮

Question

I am trying to make a button that adds 2 to a number in a textbox every time I touch it. I know how to add 1 like :

int l; 
t1.Text = l++.Tostring();

How can I add 2 when the button is touched?

Answer 1

By "add 2 to textbox" i assume you mean:

int l = 0;
t1.Text = (l + 2).ToString();

Edit:

To make things clear - this will always set your TextBox to 2. If you want to increment l each time the button is clicked, you have to make l a class level variable:

public class SomeActivity()
{
   private int l = 0;

   private void OnButtonClicked()
   {
      l += 2
      t1.Text = l.ToString();
   }
}

Answer 2

What you're trying to do is the following:

int l;
if (Int32.TryParse(t1.Text, out l))
{
   t1.Text = (l+2).ToString();
}

This is a very basic question and it might cause some anger to post such questions. Therefore I would encourage you to read a book or tutorial on C# before posting similar questions. Unfortunately I only know german books, but a search on Google should help you out.

Answer 3

int count = 0;

buttonObject.Click += (sender, args) => {

            count += 2;
            buttonObject.Text = count.ToString();
        };