There was no Static Base method (Model Validation Extension code failed)-CodePudding

Hi everyone

I wanted to create a static base method instead of writing a Validate Method separately for each model, but it didn't happen.

Is there a way? or is it necessary to try another method?

Controller

    [HttpPost]
    public IActionResult SaveMember(MemberPostModel postedMember)
    {
        if (postedMember.Validate()) return null;
        // other code ...
    }

Model

public class MemberPostModel : PostModelBase<MemberPostModel>, IDto
{
    public int Id { get; set; }

    // other properties...
}

Base Model for Validation

public static class PostModelBase<TPostModel> where TPostModel : IDto
{
    public static bool Validate(this TPostModel postModel)
    {
        foreach (var prop in postModel.GetType().GetProperties())
        {
            if (prop.PropertyType == typeof(string))
            {
                var length = prop.GetValue(postModel)?.ToString().Length.ToInt32();
                var attr = prop.GetPropertyCustomAttribute<StringLengthAttribute>();
                if (attr == null) continue;
                if (attr.MaximumLength == length) continue;
                else return false;
            }
        }
        return true;
    }
}

CodePudding user response：

Why does it have to be static at all? This looks like it should work if you simply remove the static keyword. The static keyword on classes in C# doesn't do anything, except for preventing you from creating non-static methods. In my opinion it makes sense to have separate validators for your models. What if you need to check some additional property in the future?

CodePudding user response：

You cannot inherit a static class because they are sealed and abstract. If you need to inherit a class, you'll need to make it non static.