Possible parsing error from a class method

Question

So I'm trying to return a decimal value for a total cost of a bill into a textbox from a class method.

this class method is as shown:

public decimal calcCost(decimal totalCost, bool specialistRepair, decimal labourHours,      decimal standardRate, decimal partSaleCost)
    {

        foreach (Job j in m_jobs)
        {
            if (specialistRepair == true)
            {
                totalCost = totalCost + 45;
            }

            totalCost = totalCost + partSaleCost + (labourHours * standardRate);
        }

        return totalCost;
    }

the problem I'm having is that it's saying 'Cannot implicitly comvert type 'decimal to 'string'.

I have tried parsing the whole line after the '=' sign but that's not possible.

txtTotal.Text = //Here// Program.AuspexDo.calcCost(0, checkSpecialist, jobHours, standardRate, partSaleCost);

The code for main is shown here:

      bool checkSpecialist = true;
        if (chkSpecialistRepairs.Checked == true)
        {
            checkSpecialist = true;

        }

        decimal jobHours = decimal.Parse(txtHours.Text); 
        decimal standardRate = Program.AuspexDo.StandardRate;
        decimal partSaleCost = 5; //to be configured



        txtTotal.Text = Program.AuspexDo.calcCost(0, checkSpecialist, jobHours, standardRate, partSaleCost);

If anyone could help it would be greatly appreciated. Thanks.

I have 'Cannot implicitly comvert type 'decimal to 'string'.' I'll make it clearer — Wizard
– Wizard, Commented Oct 22, 2012 at 13:51
I would pass "m_jobs" to the method and not modify a parameter "totalCost" and return that modified value but rather use a local decimal for the the calculation - but the .ToString() is the real issue (you might need to format the decimal as well. — Mark Schultheiss
– Mark Schultheiss, Commented Oct 22, 2012 at 14:06

Justin Harvey · Accepted Answer · 2012-10-22 13:50:51Z

2

Change it to

txtTotal.Text = Program.AuspexDo.calcCost(0, checkSpecialist, jobHours, standardRate, partSaleCost).ToString();

answered Oct 22, 2012 at 13:50

Justin Harvey

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1 Comment

Wizard Over a year ago

Oh wow, I wouldn't have thought to have done that, it's not showing an error, I'll check it does what I want it too.

Oded · Accepted Answer · 2012-10-22 13:55:12Z

calcCost returns a decimal and you are trying to assign the return value to txtTotal.Text, which is of type string.

As the error says, there is no conversion between the two - you need to convert the return value to a string first - the way to do that is to call ToString() on the return value:

txtTotal.Text = Program.AuspexDo.calcCost(0, 
                                          checkSpecialist, 
                                          jobHours, 
                                          standardRate, 
                                          partSaleCost)
                                          .ToString();

Take a look at the custom and standard numeric format strings, as well as the information about composite format strings, as you may want to output to a specific format.

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