String from byte array doesn't get trimmed in C#?

问题

I have a byte array similar to this (16 bytes):

71 77 65 72 74 79 00 00 00 00 00 00 00 00 00 00

I use this to convert it to a string and trim the ending spaces:

ASCIIEncoding.ASCII.GetString(data).Trim();

I get the string fine, however it still has all the ending spaces. So I get something like "qwerty.........." (where dots are spaces due to StackOverflow).

What am I doing wrong?

I also tried to use .TrimEnd() and to use an UTF8 encoding, but it doesn't change anything.

Thanks in advance :)

回答1:

You have to do TrimEnd(new char[] { (char)0 }); to fix this. It's not spaces - it's actually null characters that are converted weirdly. I had this issue too.

回答2:

They're not really spaces:

System.Text.Encoding.ASCII.GetString(byteArray).TrimEnd('\0')

...should do the trick.

-Oisin

回答3:

Trim by default removes only whitespace, where whitespace is defined by char.IsWhitespace.

'\0' is a control character, not whitespace.

You can specify which characters to trim using the Trim(char[]) overload:

string result = Encoding.ASCII.GetString(data).Trim(new char[] { '\0' });

回答4:

Why try to create the string first and trim it second? This could add a lot of overhead (if the byte[] is large).

You can specify index and count in the GetString(byte[] bytes, int index, int count) overload.

int count = data.Count(bt => bt != 0); // find the first null
string result = Encoding.ASCII.GetString(data, 0, count); // Get only the characters you want

回答5:

In powershell, you can do this:

$yourString.TrimEnd(0x00)

来源：https://stackoverflow.com/questions/1402622/string-from-byte-array-doesnt-get-trimmed-in-c