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2012-02-09T13:13:04.670
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Interesting question! I can think of two work-arounds to this. So not proper solutions based on what you want but they might help to re-use your code. Cant you create a CustomAttribute abstract class called MyCustomAttribute (or something) that overrides IsValid in the following way: <pre><code>public override bool IsValid(object value) { var model = (MyObject) value; //if this value is set, I don't want to do anything other checks if (model.Prop3) { return true; } CustomValidate(model); } </code></pre> <code>CustomValidate(MyObject model)</code> is your abstract method then, you can write multiple custom attribute classes that extend MyCustomAttribute and purely need to implement the validation logic for A particular scenario. So you can have two classes: <pre><code>public class BlahCustomAttribute : MyCustomAttribute { public override Boolean CustomValidate(MyObject obj) { if (model.Prop1 == "blah" && model.Prop2 == 1) { ErrorMessage = "you can't enter blah if prop 2 equals 1"; return false; } } } public class BlahBlahCustomAttribute : MyCustomAttribute { public override Boolean CustomValidate(MyObject obj) { if (model.Prop1 == "blah" && model.Prop2 == 1) { ErrorMessage = "you can't enter blah blah if prop 2 equals 1"; return false; } } } </code></pre> Hope this helps - not exactly what you wanted but will do the job and its clean as well. The other solution is to comma-separate the error messages in the ErrorMessage property and handle it in the front-end (but I would go with the first approach).
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