c# place string into an array

Question

This could be very easy, but how can I place or convert a string into an array?

The code that I have, is the following:

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string one;
        string[] two;

        one = "Juan";
        two = {one}; // here is the error

        HttpContext.Current.Response.Write(two);
    }
}

And the error is the following: Compiler Error Message: CS0029: Cannot implicitly convert type 'string' to 'string[]'

Thanks for you help!

Habib · Accepted Answer · 2013-12-10 20:28:29Z

5

Replace this:

two = {one}; // here is the error

With

two = new[] { one };

OR

two = new string[] { one };

The reason you are getting the error is clear from the error message.

See: Object and Collection Initializers (C# Programming Guide)

Later when you are doing Response.Write, you will get System.String[] as output, since two is an array. I guess you need all array elements separated by some delimiter. You can try:

HttpContext.Current.Response.Write(string.Join(",", two));

Which will produce all the elements in the array separated by comma

edited Dec 10, 2013 at 20:28

answered Dec 10, 2013 at 20:20

Habib

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5 Comments

Julian Moreno Over a year ago

The system is showing the following: Type expected in the same line. Thanks for your quick answer.

Habib Over a year ago

@JulianMoreno, try two = new string[] { one };

Julian Moreno Over a year ago

The system shows the the folowing: The best overloaded method match for 'string.Join(string, string[])' has some invalid arguments.

Habib Over a year ago

@JulianMoreno, my bad, it should be string ",", not character ',' updated the answer

Julian Moreno Over a year ago

It works! Also The HttpContext.Current.Response.Write(string.Join(',', two)**)**; lacks from a parenthesis ")". Thanks for your quick help!

D Stanley · Accepted Answer · 2013-12-10 20:21:02Z

2

It looks like you're trying to use initialization syntax for an assignment. This should work:

two = new string[] {one};

or just

two = new [] {one};

since the compiler will infer that you want a string[]

I think you'll also be surprised what Response.Write(two); produces...

answered Dec 10, 2013 at 20:21

D Stanley

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Comments

evanmcdonnal · Accepted Answer · 2013-12-10 20:26:44Z

0

You're using the static initializer syntax to try and add an item to your array. That doesn't work. You can use similar syntax to allocate a new array with the value one - two = new string[] { one }; - or you can allocate the array then add elements through assignment like;

    string[] two = new string[10];
    two[0] = one; // assign value one to index 0

If you do it like this you have to do some bounds checking for example the following will throw an IndexOutOfRangeException at runtime;

    string[] two = new string[10];
    int x = 12;
    two[x] = one; // index out of range, must ensure x < two.Length before trying to assign to two[x]

answered Dec 10, 2013 at 20:26

evanmcdonnal

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Comments

Tim S. · Accepted Answer · 2013-12-10 20:38:54Z

0

That syntax ({one}) is only valid if you declare the array variable in the same line. So, this works:

string one;

one = "Juan";
string[] two = {one};

A more common way to initialize an array, which works in more places, is to use the new keyword, and optionally have the type be inferred, e.g.

string one;
string[] two;

one = "Juan";
// type is inferrable, since the compiler knows one is a string
two = new[] {one};
// or, explicitly specify the type
two = new string[] {one};

I usually declare and initialize on the same line, and use var to infer the type, so I'd probably write:

var one = "Juan";
var two = new[] { one };

answered Dec 10, 2013 at 20:38

Tim S.

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