asked on

Decimal validation using c#

Hi Experts,

I am doing Model validation in web api and have to validate decimal field using C#.

Valid inputs: 3.00,38, 498, 4444.4
Invalid inputs: @@,##,3.#d

Here is the code

 public class Foo
    {
       
      [Required(ErrorMessage = "Price is required")]
        
        public decimal Price { get; set; }
       
    }

if(this.Price>=777.77m)
{

return new ValidationResult("Price can't be greater than 777.77")

}

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//Want to check if input is decimal or not .How can I achieve using c# .Do we have any built-in function in c#?

else if (!input is decimal )
{
return new ValidationResult("Invalid Price fomat")
}

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ASKER CERTIFIED SOLUTION

Kyle Abrahams, PMP

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Rgonzo1971

Hi,

Maybe Decimal.TryParse

string value;
decimal number;

// Parse a floating-point value with a thousands separator. 
value = "1,643.57";
if (Decimal.TryParse(value, out number))
   Console.WriteLine(number);
else
   Console.WriteLine("Unable to parse '{0}'.", value);

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Refer to http://msdn.microsoft.com/en-us/library/9zbda557(v=vs.110).aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-1

Regards

SOLUTION

kaufmed

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ksd123

ASKER

Hi Kyle,

I tried below code as you suggested,but giving error "invalid arguements".

decimal.TryParse takes string and decimal types as agruments.

Decimal d;

if (!decimal.TryParse(this.Price, out d))
return new ValidationResult("Invalid Price fomat");

kaufmed

TryParse is for attempting to turn strings into decimals, not decimals into decimals. This is why you get the error. Please see my previous comment.