c# - Currency range and format validator for string field -

what correct currency data annotations following condition?

1. numeric amount 2 decimal places.
2. minimum amount $1.00; max amount $25000.00

here field.

public string amount {get; set;} 

to check decimal places can use regularexpression annotation proper regex match number format:

[regularexpression(@"(\.\d{2}){1}$")] 

to check minimum , maximum value must create our own custom attributes

[mindecimalvalue(1.00)] [maxdecimalvalue(25000.00)] public string amount { get; set; } 

we can creating class deriving validationattribute , overriding isvalid method.

see implementation below.

[attributeusage(attributetargets.field | attributetargets.property, allowmultiple = false, inherited = true)]     public class maxdecimalvalueattribute : validationattribute     {         private double maximum;         public maxdecimalvalueattribute(double maxval)             : base("the given value more maximum allowed.")         {             maximum = maxval;         }         public override bool isvalid(object value)         {             var stringvalue = value string;             double numericvalue;             if(stringvalue == null)                 return false;             else if(!double.tryparse(stringvalue, out numericvalue) ||  numericvalue > maximum)             {                 return false;             }         return true;     } }  [attributeusage(attributetargets.field | attributetargets.property, allowmultiple = false, inherited = true)] public class mindecimalvalueattribute : validationattribute {     private double minimum;     public mindecimalvalueattribute(double minval)         : base("the given value less minimum allowed.")     {         minimum = minval;     }     public override bool isvalid(object value)     {         var stringvalue = value string;         double numericvalue;         if (stringvalue == null)             return false;         else if (!double.tryparse(stringvalue, out numericvalue) || numericvalue < minimum)         {             return false;         }          return true;     } } 

you can read more on how create own attributes, code needs more improvement.

hope helps!