One of the many nice things they have added in MVC 2 is model/view model validation on both the client and server side.I won’t go into the basics here since they have been covered extensively by others.The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System. Using a custom Action Filter Attribute, I can accomplish my goal. The following solution applies to the first version of the ASP. A common solution is to convert the method argument to a nullable integer, which will automatically cause the argument to be null when the route value specified in the URL is an empty or non-integer value.Below I show you the three phases my validation code went through before I finally end up where I probably should have started. I didn't want to have to know what the exact type of the validator implementation was.Before getting to far into this tutorial you'll want to make sure you: and I know that ASP. This seemed like a good time to use Structure Map (in reality, it wasn't).You can always turn the validation on the client side off using the enable client side property to false.Lets see the difference between the client side validation and the server side validation.
We could change it from being a hidden field to a text field and the same code would work as expected, but that’s not what we want to do. The problem stems from when invalid values or missing values are passed to these integer-expecting actions; MVC handles the inability to parse the value into an integer, but then throws an exception trying to pass a null value to a Controller Action expecting a value type for a method argument. NET MVC 2 Route Values with Default Value Attribute. NET MVC Route is the Id, passed as a method argument to a controller action. Empty, but it can be parsed to other types such as an integer for a default Details action.Thankfully we are far from the days of having to manually handle that task. NET Core 1.1 project I wanted a more expressive way to handle validation.Enter : a small library that does an excellent job handling input validation (high level validation before you get into the heart of your business logic). The first step was a given, add the required dependencies to my Next, I wanted a generic way to get the validator for a given class based on the class's type.