Char array to a String using .NET system? [duplicate]

Question

How can I store the contents of a char array into a text file in C# with .NET? I have tried

char[] characters = VarInput.ToCharArray();
System.IO.File.WriteAllText(@"C:\Users\leoga\Documents\Projects_Atom\Pad_Wood\WriteText2CharacterArray.txt", characters);

but it comes up with an error message saying

Argument 2: cannot convert from 'char[]' to 'string'
[C:\Users\leoga\Documents\Projects_Atom\Pad_Wood\converter.csproj]

I have also tried it with File.WriteAllLines() but it still doesn't work. I am using c# and .NET

Is the VarInput.ToCharArray() just for sample purposes and your code is really passed/provided a char[] with no way to associate it with the original string (or there was no string to begin with)? Or you do have a string and were thinking it can only be written to a file as individual chars? — Lance U. Matthews
– Lance U. Matthews, Commented Dec 1, 2019 at 0:44

Wieschie · Accepted Answer · 2019-11-30 22:07:54Z

4

What type is VarInput? If it's a string initially, just remove the ToCharArray() call and you can write it to a file directly with File.WriteAllText.

File.WriteAllText(path, VarInput);

Once you have a char array, you don't have to convert to a string in order to write to a file. You can also write bytes directly.

var bytes = System.Text.Encoding.UTF8.GetBytes(characters);
File.WriteAllBytes(path, bytes);

answered Nov 30, 2019 at 22:07

Wieschie

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Comments

ChaosFish · Accepted Answer · 2019-12-01 00:40:09Z

1

Reason

Because OP converted the string to an array when there wasn't a need to, you can use it directly.

Other way

code

        public void Write(string path)
        {
            FileStream fs = new FileStream(path, FileMode.Create);
            using (fs)
            {
                StreamWriter sw = new StreamWriter(fs);
                using (sw)
                {
                    string VarInput = "11111111";
                    char[] characters = VarInput.ToCharArray();
                    sw.Write(characters);
                }
            }
        }

About doc

edited Dec 1, 2019 at 0:40

answered Nov 30, 2019 at 22:16

ChaosFish

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1 Comment

ChaosFish Over a year ago

It has been updated. Thank you for pointing out.

sticky bit · Accepted Answer · 2019-11-30 22:13:51Z

-1

There should be a built in function to run joins on Arrays, converting to String.

Here's an example of doing this to export an array as a CSV:

String result = String.Join(",",arr)

If you're looking to just convert to a String without any delimiters, you can do something like this:

String result = String.Join("",arr)

edited Nov 30, 2019 at 22:13

sticky bit

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answered Nov 30, 2019 at 21:52

mochsner

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1 Comment

Lance U. Matthews Over a year ago

Passing an empty string and a char[] to String.Join() would be the less-efficient alternative to just passing the char[] to the String(char[]) constructor (i.e. String result = new string(arr);).

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