在C＃中从双精度删除字符串

Question

I am sending data from arduino to c# and have a problem. The value I get from the serialread comes with an "\\r" at the end of it, example: "19.42\\r". I found a solution to delete the characters after my number by using Regex. But it also makes my double an integer. "19.42\\r" becomes "1942". How can I delete my string but still keep the value as a double?

line = Regex.Replace(line, @"[^\\d]", string.Empty);

Answer 1

You want to trim the whitespace from the end of the string.

Use

line = line.TrimEnd();

See the C# demo

If you need to actually extract a double number from a string with regex, use

var my_number = string.Empty;
var match = Regex.Match(line, @"[0-9]+\.[0-9]+");
if (match.Success) 
{   
    my_number = match.Value;
}

If the number can have no fractional part, use @"[0-9]*\\.?[0-9]+" regex.

Answer 2

string data = "19.42\r";
return data.Substring(0, data.Length - 1);

or even better

data.TrimEnd('\r')

Answer 3

if \\r is fixed characters you want to remove

string str = "awdawdaw\r";
str = str.replace("\r","");

if \\r is not fixed characters you want to remove

string str = "awdawdaw\\";
str = str.Substring((str.Length - 2), 2);  \\will be removed