Problem in converting a string to a char array

[raiden]

I am designing a calculator in C#, I need to write a code for a backspace operation. for that i need to convert the text(string) value in the calculator to a single one dimensional char array, I tried using the following

 

string num1 = "Hello World";

char[] numarr = num1.ToCharArray();

 

this works only on console and does not work in forms.

 

then I tried using arraylists,

 

string txt1 = "Hello World";

ArrayList x1 = new ArrayList();//initializes the new arraylist

x1.Add(txt1);//assigns the variable to the arraylist

string txt2 = System.String.Concat(x1.ToArray());

 

this code crashes the app during runtime,

 

Can anybody help me? PLEASE

 

thanks in advance......

[PlausiblyDamp]

What problems are you having with the first bit of code? If it works correctly under a console app then it certainly should work for a windows app.

 

Not sure what the second snippet should be doing - from the look of it you should just end up with txt2 containing the same as txt1.

[raiden]

Yes you are absolutely right, i was surprised too but wen I use it in Console app it works fine. but when I work in windows app I get the following error

---------------------

Error 1 Cannot convert method group 'ToCharArray' to non-delegate type 'char[]'. Did you intend to invoke the method? D:\.NET Development\C#.NET\My C# Codes\Calculator\WindowsApplication1\Form1.cs 265 27 WindowsApplication1

---------------------

 

why is this happening? please help, thank you

Edited December 1, 2007 by raiden

[PlausiblyDamp]

Could you post the actual code you are using in the windows application?

[raiden]

Well I think My coding is wrong Ill try to post the answer wen I correct my code, thanks anyway Edited December 2, 2007 by raiden

[snarfblam]

Error 1 Cannot convert method group 'ToCharArray' to non-delegate type 'char[]'. Did you intend to invoke the method?

The compiler error asks an important question. Are you sure you didn't forget the parentheses in the WinForms app? Without parentheses, a function name evaluates to a method group.

 

In case you aren't aware, or for the benefit of other programmers, a method group is a C# "type" comprised of all overloads of a method. Parentheses are required to invoke a function, even if the method has no arguments, and even if there is only one overload, in order to resolve an overload. It is a lexical matter.

 

In other words, this error typically means you forgot your parentheses. If you forget your parentheses, you identify a method group instead of invoking a method. The compiler politely asks if you wouldn't rather invoke a method.

[raiden]

you are absolutely correct, my bad. I forgot about the parenthesis, anyway i solved the problem by using the following code

string txt1 = "Hello";

                string txt5 = "";

                char[] txt2 = txt1.ToCharArray();

                int abc = txt2.Length - 1;

                char[] txt3 = new char[abc];

                for (int p = 0; p < abc; p++)

                {

                    txt3[p] = txt2[p];

                    String txt4 = Convert.ToString(txt3[p]);

                    txt5 = txt5 + txt4;

                }

                Console.WriteLine (txt5);

[/Code]

[raiden]

I wold Like to thank all the people who helped me in this issue.