array of char to string in c#

Question

I have a string that looks like a phone number. I'm using a lambda to extract an array of char. Then I want to convert this array into a string. This is what I have:

PhoneCandidate = "(123)-321-1234"; //this is just an example of what it could look like
var p = PhoneCandidate.Where(c => char.IsDigit(c)).ToArray();

string PhoneNumber = p.toString();

However, when I run this code, the variable PhoneNumber becomes just "System.Char[]" instead of the values inside the array.

What do I need to change?

Thanks.

Unrelated, but you could change your Where to a method group: PhoneCandidate.Where(char.IsDigit).ToArray() — vcsjones
– vcsjones, Commented Dec 18, 2011 at 20:19

Adam Robinson · Accepted Answer · 2011-12-18 20:14:07Z

6

You can use the string constructor that takes a char[].

string PhoneNumber = new string(p);

answered Dec 18, 2011 at 20:14

Adam Robinson

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3 Comments

frenchie Over a year ago

Would this execute faster or not? string PhoneNumber = new string(PhoneCandidate.Where(c => char.IsDigit(c)).ToArray());

SLaks Over a year ago

@frenchie: That will compile to identical IL.

frenchie Over a year ago

Ok, thanks for this clarification. Probably better to leave it as for future clarity then.

SLaks · Accepted Answer · 2011-12-18 20:14:18Z

3

string phone = new string(p);

answered Dec 18, 2011 at 20:14

SLaks

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Comments

Felice Pollano · Accepted Answer · 2011-12-18 20:14:16Z

2

Try with constructor res = new string(yourArray);

answered Dec 18, 2011 at 20:14

Felice Pollano

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Oded · Accepted Answer · 2011-12-18 20:14:47Z

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One of the string constructors takes a char[]:

string PhoneNumber = new string(p);

answered Dec 18, 2011 at 20:14

Oded

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Joel Coehoorn · Accepted Answer · 2011-12-18 20:20:10Z

1

Let's take this a whole new direction:

Dim digits as New Regex(@"\d");
string  phoneNumber = digits.Replace(PhoneCandidate, "");

answered Dec 18, 2011 at 20:20

Joel Coehoorn

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2 Comments

frenchie Over a year ago

Which do you think is faster? A regex or a linq expression?

Joel Coehoorn Over a year ago

@frenchie You should measure based on real data and volume, but I would expect the Regex to do a lot better here.

GETah · Accepted Answer · 2011-12-18 20:17:00Z

0

Assuming p is a char[] you can use the following:

String phoneNumber = new String(p);

answered Dec 18, 2011 at 20:17

GETah

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Muad'Dib · Accepted Answer · 2011-12-18 20:25:48Z

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probably the best bet is to use the string constructor per (@Adam Robinson) however as an alternative, you can also use string.Join(string separator,params string[] value) (MSDN docs here)

PhoneCandidate = "(123)-321-1234"; //this is just an example of what it could look like
var p = PhoneCandidate.Where(c => char.IsDigit(c)).ToArray();

string str = string.Join(string.Empty,p);

answered Dec 18, 2011 at 20:25

Muad'Dib

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