asp.net mvc - Custom Regular Expression Validation in MVC3 -

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i on way implement custom regular expression validator 1 of mvc3 project.

i have been able perform validation correctly using custom atrribute.

the view model property decorated below custom attribute

[regularexpressionif("dependantproperty","targetvalue","pattern","errormessage")]

but requirement , need match property1 values regular expressions based on property2 value. ex. property 2 dropdown , has values 1,2,3 . if user selects 1, regular expresion pattern {regx1}, 2 {regx2} that.

i tried modify attribute passing variables contain these values. on build .net insists should "constant" passed. able hard code value in attribute, in no way can pass parameter below

[regularexpressionif("dependantproperty","targetvalue",patterndictionary,"errormessage")]

if me out in great..

you'll need use reflection value of property @ runtime.

protected override validationresult isvalid(     object value,      validationcontext context) {     // dependantproperty string name of dependant property     propertyinfo property = context.objecttype.getproperty(this.dependantproperty);     object dependant = property.getvalue(context.objectinstance, null);      // dependant }

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