Argument 2: cannot convert from method group to InfoItem

Question

Code:

Dictionary<ValidationType, Func<ValidationModel, InfoItem>> itemValidator = new Dictionary<ValidationType, Func<ValidationModel, InfoItem>>()
{
    { ValidationType.Int32, Validator.ValidateInt }
}  


public static class Validator
{
    public static ValidationModel ValidateInt(InfoItem item)
    {
        ...
    }
}

I am getting the error:

Argument 2: cannot convert from method group to InfoItem

I have gone through the other errors in the site but I am still at a loss. The signature to things looks correct to me which I thought was the error to the other answers on the site!

Can someone point me in the right direction?

Answer 1

public static ValidationModel ValidateInt(InfoItem item) is a Func<InfoItem, ValidationModel> , not Func<ValidationModel, InfoItem> .

Out item is always last in Func

Answer 2

Since the ValidateInt method returns a ValidationModel the value type of your dictionary should be Func<InfoItem, ValidationModel> . This compiles:

Dictionary<ValidationType, Func<InfoItem, ValidationModel>> itemValidator = new Dictionary<ValidationType, Func<InfoItem, ValidationModel>>()
{
    { ValidationType.Int32, Validator.ValidateInt }
};