evaluate string expression in C# [duplicate]

Question

I have the following string expression which am trying to run ,But am getting error saying string format is not correct

for (i = diffvol; i < result.count; i++)
{
    B1Volume = Convert.ToDecimal(String.Format("result.Data[0].B{0}Volume", i));
    B2Volume = Convert.ToDecimal(String.Format("result.Data[0].B{0}Volume", i));
}

result.Data[0].B{0}Volume => even this is not a valid decimal format... you need to convert expression directly into decimal. — Tetsuya Yamamoto
– Tetsuya Yamamoto, Commented Oct 30, 2017 at 9:11
Supposing i==10 what should be the conversion to decimal of this string result.Data[0].B10Volume ? — Steve
– Steve, Commented Oct 30, 2017 at 9:12
Convert.ToDecimal called with a string expects to have a string that is the text rapresentation of a number, e.g. 10.25. The string you are passing is code that you expect will be evaluated: it will not. — Gian Paolo
– Gian Paolo, Commented Oct 30, 2017 at 11:47

Florin Toader · Accepted Answer · 2017-10-30 09:21:02Z

1

The error you are getting is related to the Convert.ToDecimal method, NOT the String.Format. The reason should be obvious: a string such as "result.Data[0].B0" is not the string representation of a number. A string such as "1407" would be one.

answered Oct 30, 2017 at 9:21

Florin Toader

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