Use of unassigned local variable 'fileData'?

The compiler is reading Error: Use of unassigned local variable 'fileData'.

I have searched but none of the things I have tried solved my problem.

 private ScrPrnData ParseTemperatureFileLine(string sLine)
    {
        char[] delimiter = { '\t' };
        string[] elements = sLine.Split(delimiter, 200);

        ScrPrnData fileData; 

        fileData.dTempZone1 = double.Parse(elements[0].Trim());
  开发者_运维百科      fileData.dTempZone2 = double.Parse(elements[1].Trim());
        fileData.dTempZone3 = double.Parse(elements[2].Trim());
        fileData.dTempZone4 = double.Parse(elements[3].Trim());

        return fileData;
    }

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private ScrPrnData ParseTemperatureFileLine(string sLine)
{
    ...
    ScrPrnData fileData = new ScrPrnData(); 
    ...
}

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You have to create an actual object of that type:

ScrPrnData fileData = new ScrPrnData();

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You're never initializing fileData and compiler is saving you the obvious NullReferenceException at runtime.

ScrPrnData fileData; // <- need to initialize this here.

// fileData will always be null here and throw an Exception
// the compiler knows this and is saving you the headache
fileData.dTempZone1 = double.Parse(elements[0].Trim());

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You're using fileData without initializing it with some value. Try:

ScrPrnData fileData = new ScrPrnData();

or something to that effect.

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You need to instantiate it.

 ScrPrnData fileData;  = new ScrPrnData ();