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Decimal validation using c#

Posted on 2014-11-19
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Last Modified: 2014-11-25
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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0
Comment
Question by:ksd123
5 Comments
 
LVL 40

Accepted Solution

by:
Kyle Abrahams earned 250 total points
ID: 40453235
Luckily it's done for you:

Decimal d;

if (!decimal.TryParse(input, out d))
  return new ValidationResult("Invalid Price fomat");
//else
   // do something?
0
 
LVL 49

Expert Comment

by:Rgonzo1971
ID: 40453242
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
0
 
LVL 75

Assisted Solution

by:käµfm³d 👽
käµfm³d   👽 earned 250 total points
ID: 40453278
If your model property is of type decimal, then you should not have to validate anything--if the submitted value cannot be converted to a decimal, then it will get put in as the default value. Unfortunately, since you are using decimal, the default value is zero, so you may want to change the type of that property. Using a nullable decimal (decimal?) would yield a default value of null. However, then you won't know if the value was incorrect or simply not submitted. The remaining choice would be to type the property as string, at which point you could do checks for null (value not submitted) or TryParse checks (ill-formatted value submitted).
0
 

Author Comment

by:ksd123
ID: 40454089
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");
0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40454217
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.
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