An expression tree may not contain a call or invocation that uses optional arguments

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hi,

i created this simple function to convert Decimal to user decimal fraction settings :

public static decimal GetDecimalParts(this decimal value, string CurrencyPart = ".")
        {
            for (int i = 0; i < BasicVars.CurrencyPart; ++i)
            {
                CurrencyPart += "0";
            }
            decimal ReturnedValue = Convert.ToDecimal(value.ToString(CurrencyPart));
            return ReturnedValue;
        }

how to use it in entity framework query ?

What I have tried:

i tried that : MaxPrice = Convert.ToDecimal(s.MaxPrice).GetDecimalParts()

var data = DB1.view_items_stocks_ranges_prices_noserials.Select(s=> new
            {
                s.DetunitID,
                MaxPrice = Convert.ToDecimal(s.MaxPrice).GetDecimalParts(),
                s.MinPrice,
                s.NOSStoreID,
                s.percent,
                s.stitems_Code,
                s.stitems_ID,
                s.stitems_Name,
                s.stitems_Status,
                s.stitems_Type,
                s.Stock,
                s.UnitName
            }).OrderByDescending(u => u.percent).Where(u => u.stitems_Status == 1);

but this error appear :
Severity Code Description Project File Line Suppression State

Error CS0854 An expression tree may not contain a call or invocation that uses optional arguments

Posted 23-May-19 6:39am

Golden Basim

Updated 24-Sep-19 0:02am

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2 solutions

Solution 3

You have to explicitly provide the default value of the parameter in the lambda expression.

C#

var data = DB1.view_items_stocks_ranges_prices_noserials.Select(s=> new
            {
                s.DetunitID,
                MaxPrice = Convert.ToDecimal(s.MaxPrice).GetDecimalParts("."),
                s.MinPrice,
                s.NOSStoreID,
                s.percent,
                s.stitems_Code,
                s.stitems_ID,
                s.stitems_Name,
                s.stitems_Status,
                s.stitems_Type,
                s.Stock,
                s.UnitName
            }).OrderByDescending(u => u.percent).Where(u => u.stitems_Status == 1);

Posted 24-Sep-19 0:02am

MarSal77

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F-ES Sitecore · Accepted Answer · 2019-05-23T06:52:00

Try and create an extension that omits the optional param but functions the same way

public static decimal GetDecimalParts(this decimal value, string CurrencyPart)
        {
            for (int i = 0; i < BasicVars.CurrencyPart; ++i)
            {
                CurrencyPart += "0";
            }
            decimal ReturnedValue = Convert.ToDecimal(value.ToString(CurrencyPart));
            return ReturnedValue;
        }

public static decimal GetDecimalParts(this decimal value)
        {
            return GetDecimalParts(value, ".");
        }