MVC Optional Parameter Default Value

Question

I have the following MVC Action: ``` [ActionName("order-brochure")] public ActionResult OrderBrochure(int brochureId, bool isModal = true) { return View(HomeModelBuilder.BuildOrderBrochureModel(brochureId, isModal, false)); } ``` Where `isModal` is an optional parameter Is there any other way to set the default for this other than using `bool isModal = true` within the method as my company uses code analysis and this fails giving a CA1026: default parameters shouldn't be used However, I can't override the method as you can't have two actions with the same name as you'll get an error along the following lines: ``` The current request for action 'order-brochure' on controller type 'HomeController' is ambiguous between the following action methods: System.Web.Mvc.ActionResult OrderBrochureModal(Int32, Boolean) on type MarshallsCoUkCommercial.Website.Controllers.HomeController System.Web.Mvc.ActionResult OrderBrochure(Int32) on type MarshallsCoUkCommercial.Website.Controllers.HomeControll…

Accepted Answer

Apparently this rule is outdated and should not be applied to C# 4.0 and above. See this discussion for similar question.

I would say just disable this rule, as it makes no sense in MVC4.

However, suppressing the rule might not be compliant with your company rules, then you'd have to work around that. (These rules are silly, when you have to hack around some outdated crap like that!)

One of the options is to have a custom rule for the every case like that: specify default value for optional param. (Sorry, can't find implementation for that quickly)

Or, as already suggested go with nullable boolean

```
public ActionResult OrderBrochure(int brochureId, bool? isModal)
```

and then in your method check for null on `isModel`.

MVC Optional Parameter Default Value

Solution

Problem