C＃，在按下按钮时循环通过TextBlock，因此关闭

Question

So I am working in C#, bit of a beginner, I have searched around but cannot find anything.

I have a TextBlock on my screen and a Button, each time the button is pressed I want the new text to be the content of the TextBlock, this is what I have so far however it only shows the last line, thanks.

 string[] arr = new string[4]; 
        arr[0] = "Hello and Welcome";               
        arr[1] = "To the new app";             
        arr[2] = "enjoy your stay";             
        arr[3] = "press next to continue";          

        for (int i = 0; i < arr.Length; i++)
        {
            string s = arr[i];
            tbArray.Text = s;
        }

Answer 1

You are not storing each string, but only the last one.

Add a little + before your equals like so:

string[] arr = new string[4]; 
arr[0] = "Hello and Welcome";               
arr[1] = "To the new app";             
arr[2] = "enjoy your stay";             
arr[3] = "press next to continue";          

for (int i = 0; i < arr.Length; i++)
{
    string s = arr[i];
    tbArray.Text += s;
}

It would be also nice to add a space or a new line as they will be squashed together this way.

Answer 2

If I understand correctly, you would like to display the next element from your array every time your button is pressed? You should store the current index of your array in a variable in your class and each time your button is pressed increment its value. Obviously, make sure you check that your index is not out of bounds.

public class Foo
{
    private int index = 0;

    private string[] arr = new [] { "Hello and Welcome",
                                    "To the new app",
                                    "enjoy your stay",
                                    "press next to continue" };     

    private void ButtonCallback(...)
    { 
         tbArray.Text = arr[index++]; 
    }
}

Answer 3

I immgine you always see "press next to continue" string. as this is the last string assigned to a text box. You have to aggergate all strings into the single one and final string assign to a text box.

Simple example:

StringBuilder sb = new StringBuilder(); 
for (int i = 0; i < arr.Length; i++)
{
  sb.Append(arr[i]); 
}

tbArray.Text = sb.ToString();

Answer 4

if you want to display new Text from array each time you press a button

Global "i" variable and your array "arr"

/* global variable */
var i = 0;
/* your array - e.g. javascript array */
var arr = ['Hello and Welcome', 
            'To the new app', 
            'enjoy your stay', 
            'press next to continue'];

Call this function

 function displayText() {
        if(i >= arr.length) {
            i=0;
        }
        yourTextBlock.Text = arr[i];
        i++;
    }