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copied!<p>You could use the <a href="http://msdn.microsoft.com/en-us/library/system.web.mvc.modelclientvalidationrule.validationparameters.aspx" rel="noreferrer"><code>ValidationParameters</code></a> property to add custom parameters to the rule:</p> <pre><code>public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context) { var rule = new ModelClientValidationRule { ErrorMessage = this.ErrorMessage, ValidationType = "futuredate", }; rule.ValidationParameters.Add("param1", "value1"); rule.ValidationParameters.Add("param2", "value2"); yield return rule; } </code></pre> <p>which could be used in the adapter:</p> <pre><code>jQuery.validator.unobtrusive.adapters.add( 'futuredate', [ 'param1', 'param2' ], function (options) { var param1 = options.params.param1; // shall equal 'value1' var param2 = options.params.param2; // shall equal 'value2' // TODO: use those custom parameters to define the client rules } ); </code></pre> <hr> <p>UPDATE:</p> <p>As requested in the comments section here's how you could pass those parameters to the custom validator rule function:</p> <pre><code>jQuery.validator.unobtrusive.adapters.add( 'futuredate', [ 'param1', 'param2' ], function (options) { // simply pass the options.params here options.rules['greaterThan'] = options.params; options.messages['greaterThan'] = options.message; } ); jQuery.validator.addMethod('greaterThan', function (value, element, params) { // params here will equal { param1: 'value1', param2: 'value2' } return ... }, ''); </code></pre>

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