How to convert a string array element to string?

Question

I have a string array

public: array<String ^> ^ sss;
public:
    Form1(void)
    {
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        //
        array<String ^> ^ sss = gcnew array<String ^>(3);
        sss[0]="asdasd";
        sss[1]="s115ss";
        sss[2]="s115ss";
    }

I need to show the 1st element into a textbox.

I used

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

             textBox2->Text = sss[0];
         }

Vc++ gave System.NullReferenceException. Why? And how to fix it?

The error:

An unhandled exception of type 'System.NullReferenceException' occurred in test000.exe Additional information: Object reference not set to an instance of an object.

Please add the full stack trace. Based on the information you've provided I am willing to bet that the NullReference is the object textbox not s — Andrew T Finnell
– Andrew T Finnell, Commented Apr 21, 2012 at 5:02
Not Right. The following code works in my program textBox2->Text = "11111"; — user765168
– user765168, Commented Apr 21, 2012 at 5:14

svick · Accepted Answer · 2012-04-21 19:21:28Z

1

Your code shouldn't compile, unless you also have a field called sss. If that's the case, you want to set the value of that field in your constructor, not of some unrelated local variable with the same name:

array<String ^> ^ sss;

public:
    Form1(void)
    {
        InitializeComponent();

        sss = gcnew array<String ^>(3);
        sss[0]="asdasd";
        sss[1]="s115ss";
        sss[2]="s115ss";
    }

answered Apr 21, 2012 at 19:21

svick

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3 Comments

user765168 Over a year ago

I am sorry I forget to add that in my post. I have that code in my code (just edited my post), but my program does not work.

svick Over a year ago

Like I said, you want to set the field, not some local variable in the constructor. Change the line where you gnew the array to the one in my answer.

user765168 Over a year ago

You are right. I am sorry that I did not catch what you mean at the first time.

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