System.ArgumentNullException error with MonoDevelop compiling a c# code

Question

I have another simple question. I have a C# program written as a .cs file. MonoDevelop (improved by Xamarin) managed to build this project. However, when I try to run it, I get the error:

System.ArgumentNullException: Argument cannot be null.
Parameter name: s
  at System.Double.Parse (System.String s, NumberStyles style, IFormatProvider provider)[0x00012] in /private/tmp/monobuild/build/BUILD/mono- 2.10.9/mcs/class/corlib/System/Double.cs:229
  at System.Double.Parse (System.String s) [0x00000] in /private/tmp/monobuild/build/BUILD/mono-2.10.9/mcs/class/corlib/System/Double.cs:200
  at SampleNamespace.SampleClass.Main () [0x00049] in /Users/ninakuklisova/ThoughtWorks/Sales Taxes with inputs.cs:42

which points to the following line of the code:

values[ItemNumber,2] = Double.Parse(quant);

What I find mysterious is that there is no /private/tmp/monobuild/build/BUILD/mono-2.10.9/mcs/class/corlib/System/ folder on my Mac, and when I compiled this code on online compilers, all went well. Do you know what could be wrong?

Thank you very much!

Mike Caron · Accepted Answer · 2013-03-26 21:10:23Z

2

That folder probably existed on the machine of whoever compiled mono.
Check to see if quant is null.

answered Mar 26, 2013 at 21:10

Mike Caron

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6 Comments

Sten Petrov Over a year ago

... or use Double.TryParse

Lochness Monster Over a year ago

Thanks for such a quick response, guys! I'm still puzzled - quant is not null, and Double.TryParse does not seem to work either. Do you have more ideas?

Mike Caron Over a year ago

How doesn't it work? What is actually in quant? Please update your question, and I might be able to update my answer

Lochness Monster Over a year ago

It seems like I solved the problem: it didn't want to work with array elements in a random order; when I renamed values[ItemNumber,2] = Double.Parse(quant); as values[ItemNumber,1] = Double.Parse(quant); and the next element mentioned, [ItemNumber,1], as [ItemNumber,2], I didn't receive any more error messages. But my brain wouldn't have turned on without your help. Thanks!

Mike Caron Over a year ago

Glad to help, although I'm not entirely sure I understand what the issue was. The exception you showed is definitely from Double.Parse, so... Well, good that it's resolved anyway!

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Lochness Monster · Accepted Answer · 2013-03-27 23:29:33Z

0

Yes, it was that simple: just don't mention column 2 before column 1. I guess most people won't do it anyways.

answered Mar 27, 2013 at 23:29

Lochness Monster

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