Creating Readonly Variables in Stimulsoft

问题

I'm a Noobie to Stimulsoft. I have Stimulsoft Version 2015.3 running for our apps in Visual Studio 2013.

Example videos found on YouTube are all old, and I have not found any to show how to create a variable using their built-in conditional logic.

There is a dictionary where variables are created:

Currently, if I try to compile, I have 10 errors as shown here:

I'll focus on the first one: decInvoiceCost.

The error says ";" expected, and gives this little preview:

The code for it, entered using their editor, is:

{if (blnUseMarketCost) { VwInvoice.MarketCost } else { VwInvoice.AverageCost } }

where blnUseMarketCost is a Boolean, and the two (2) decimal values MarketCost and AverageCost come from the database view.

Back in the error, if I click "Go to Code":

...I am taken to the source code which is rendered by their designer:

    public virtual decimal decInvoiceCost
    {
        get
        {
            // CheckerInfo: Value decInvoiceCost
            return {if (blnUseMarketCost) { VwInvoiceDetail.MarketCostInInvPricingUnit } else { VwInvoiceDetail.AverageCostInInvPricingUnit } }m;
        }
    }

I think that "m" on the end is causing some issues, but I don't really know.

Does anyone have a few current examples showing how to use basic logic in these variable fields?

UPDATE

The C# code of the report is generated by the designer. I can use it to see what the designer is trying to do, but I do not understand all of the nuances.

namespace Reports
{
    public class Report : Stimulsoft.Report.StiReport
    {
        public Report()        {
            this.InitializeComponent();
        }

        #region StiReport Designer generated code - do not modify
        // 
        // {snip}
        // 
        public virtual decimal decMarkup
        {
            get
            {
                // CheckerInfo: Value decMarkup
                return ((decInvoiceCost==0) ? 0 : (decInvoiceProfit / decInvoiceCost))m;
            }
        }
        // 
        // {snip}
        // 
        #endregion StiReport Designer generated code - do not modify
    }
}

回答1:

The code for the decInvoiceCost get implementation is invalid. You should use either of these implementations instead:

public virtual decimal decInvoiceCost
{
    get
    {
        // CheckerInfo: Value decInvoiceCost
        if (blnUseMarketCost) 
            return VwInvoiceDetail.MarketCostInInvPricingUnit;
        else 
            return VwInvoiceDetail.AverageCostInInvPricingUnit;
    }
}

this will return either one of the two values based on an if statement.

public virtual decimal decInvoiceCost
{
    get
    {
        // CheckerInfo: Value decInvoiceCost
        return blnUseMarketCost
           ? VwInvoiceDetail.MarketCostInInvPricingUnit
           : VwInvoiceDetail.AverageCostInInvPricingUnit;
    }
}

which uses the ternary operator <boolExpr> ? <valueifTrue> : <valueIfFalse>;

回答2:

You should use an expression there that returns a value. The if statement is not an expression. Try to use the conditional operator (?:).

回答3:

The updated version helps a lot. It seems Stimulsoft expects a constant number in form of a literal there (e.g. 5.0 or 7.4 ...). It then tries to mark it as a decimal for the compiler (more info here Letter after a number, what is it called?).

This means that it does NOT expect a calculation, decision or code. I have never used the software so I can only guess how to solve that issue. This is why I struggled whether I should submit this as an answer. My first guess would be to change the Init by: or the second Type Dropdown to something else than value. Something like code, calculation or similar would be what I am looking for.

The other properties seem to handle code/calculation just fine so try to look what those are using.

回答4:

Eureka!

I found the answer!

In the Stimulsoft variable editor, there is an option called Init by: that is prefilled to Value.

I changed Init by: to Expression, and the report does now pull data:

The Code View does not appear to be any different:

 public virtual decimal decMarkup
 {
     get
     {
         // CheckerInfo: Value decMarkup
         return ((decInvoiceCost==0) ? 0 : (decInvoiceProfit / decInvoiceCost))m;
     }
 }

The Stimulsoft Reports Documentation on Conditional Expressions makes no mention of this.

There are not many questions on here about Stimulsoft, and even fewer of them have answers. So, I hope someone else gets use out of this.

来源：https://stackoverflow.com/questions/35328033/creating-readonly-variables-in-stimulsoft

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stimulsoft