Display decimals (Currency) is rounding

Question

I have an application where the price should go in format int decimal-free.

int Valor = (int)(produto.Valor * 100); //o produto.Valor é um decimal

The problem is when I want to display this value in the View

In the case of products like 0.10 it displays 0

int Valor = (int)(produto.Valor * 100);

o Value is 10, equivalent to 0.10 (perfect so far)

I tried to:

@{
decimal Valor = Model.ValorExibicao / 100; //ValorExibicao é um int
}
@Valor.ToString("C", System.Globalization.CultureInfo.GetCultureInfo("pt-br"))

Displays R$ 0,00

I tried to:

@Convert.ToDouble(Model.ValorExibicao/ 100);

Displays 0 Only @Model.ValorExibicao shows the correct 10 (equivalent to 0.10)

Could create in the viewModel the correct value without formatting, but I think it would be a trick to circumvent an error of mine.

Answer 1

There are other ways to get the same result, like everything in the programming. You can make a Explicit cast for decimal. Use the decimal. Parse() to convert the values (much used when the value is in string). You can also use the Convert.Todecimal(). These three options will return you the entire value with decimal places.

Below I will leave an example of how to use each of the above mentioned forms:

public static void Main()
{
    int valor = 10;
    string valorString = "10";

    decimal valorNormal = valor/100;

    decimal valorCast = (decimal)valor/100;

    decimal valorParse = decimal.Parse(valorString)/100;

    decimal valorConvert = Convert.ToDecimal(valor)/100;

    Console.WriteLine("Valor Normal: " + valorNormal);
    Console.WriteLine("Cast explítico: " + valorCast);
    Console.WriteLine("Parse: " + valorParse);
    Console.WriteLine("Converto to: " + valorConvert);

}

Example working on dotNetFiddle.

Answer 2

The solution is very simple:

Model.ValorExibicao / 100M

This ensures that the division will be done in decimal, since the suffix M indicates a decimal literal. Then you want to apply a ToString(), one string.Format(), or a string interpolated, or another way to format the display, decimals, is at your discretion, the calculation will be right in this way.

Never use double for monetary values or others which cannot have rounding problems.