Question

I have strings in a XML file that ment to be doubles (or float) such as:

<VIPair>
<voltage>+100mV</voltage>
<current>+1.05pA</current>
</VIPair>

<VIPair>
<voltage>+5.00mV</voltage>
<current>+0.0035nA</current>
</VIPair>

The first pair will be “0.1” Volt and “0.00000000000105” Ampere.
The second pair would be “0.005” Volt and “0.000000000035” Ampere.

How can I convert them to double of float in C#?
Thanks.

P.S: I already can read them from xml file and at the moment I retrive them as string.

Answer 1

Try with this:

// Read string (if you do not want to use xml)
string test = "<voltage>+100mV</voltage>";
string measure = test.Substring(test.IndexOf('>')+1);
measure = measure.Substring(0, measure.IndexOf('<')-1);

// Extract measure unit
string um = measure.Substring(measure.Length - 1);
measure = measure.Substring(0, measure.Length - 1);
// Get value
double val = Double.Parse(measure);
// Convert value according to measure unit
switch (um)
{
    case "G": val *= 1E9; break;
    case "M": val *= 1E6; break;
    case "k": val *= 1E3; break;
    case "m": val /= 1E3; break;
    case "u": val /= 1E6; break;
    case "n": val /= 1E9; break;
    case "p": val /= 1E12; break;
}