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POPassing parameters of different type to function defined on interface in C#
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copied!<p>I want to apply a set of rules to a collection of business objects. These are simple rules and I wouldn't want to use any existing business rules engine. </p> <p>I need to pass different context to each of the rules, so every rule, in theory, might need different parameters. Below is how I'm currently doing it. Is there any other/better way? </p> <p>Note: I've evaluated using the Visitor pattern, but seems like too much effort for this particular scenario. The actual rules are not much more complicated that what I have on the example.</p> <pre><code>interface IParamBase {} interface IParam : IParamBase { string MyProperty {get; set;} } class Param : IParam { public string MyProperty {get; set;} } interface IRule { void Setup(IParamBase param); void Apply(BusinessObject businessObject); } class Rule :IRule { IParam _param; public void Apply(BusinessObject businessObject) { businessObject.AssignedFromRule = _param.MyProperty; Console.WriteLine(businessObject.AssignedFromRule); } public void Setup(IParamBase param) { _param = param as IParam; } } class BusinessObject { public string AssignedFromRule {get; set;} } void Main() { var rule = new Rule(); var param = new Param(); param.MyProperty = "my property"; BusinessObject businessObject = new BusinessObject(); rule.Setup(param); rule.Apply(businessObject); } </code></pre> <p>Update: I forgot to add to the sample my need of downcasting.</p>

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