C# Converting/Splitting a String with numeric and letters

Question

I tried to split a String into a parts array and combine them at the end into a result String. But while I tested a little bit, I get a message.

By pressing convert_click:

"NullRefenceException was unhandeled"

Object reference not set to an instance of an object.

Here the main code:

    public string []parts { get; set; }
    public string inputStr { get; set; }

    private void inputText_TextChanged(object sender, EventArgs e)
    {
        String inputStr = inputText.ToString(); 
        //example 
        //inputStr = "984, fenceshit2, 0, 1994.56025813, -1592.16428141, 16.105, 0.653280779782, 0.270598520636, 0.653281646552, 0.270598879665, -1";
    }

    private void convert_Click(object sender, EventArgs e)
    {
        String creObj = "CreateObject(";
        String result;
        String[] parts = inputStr.Split(new char[]  { ',' });

        result = creObj +
                 parts[0] + "," +
                 parts[2] + "," +
                 parts[3] + "," +
                 //...up to "parts[10"
                 ");";
        outputText.Text = result; 
        //output(should be in this case): 
        //"CreateObject(984,    1994.56025813,  -1592.16428141,  16.105, 0.653280779782,  0.270598520636,  0.653281646552, 0.270598879665, -1);"
    }

    //If I need to creat a code line in the main Designer.cs, please let me know.

I just want to split a String and combine them in the end into 1 string and send this into a text box.

If someone wants the sourcecode, pm me.

Answer 1

Because you are assigning inputText.toString() to local inputStr. Inside function inputText_TextChanged, just write

inputStr = inputText.Text;

Answer 2

You are declaring a local copy of input string, when you really want to be assigning to the public one.

Instead of

String inputStr = inputText.ToString(); 

Just do this:

inputStr = inputText.ToString();