asp.net mvc bind a specific model

Question

I have a model with a collection

public class Model
{
     IEnumerable<ModelPart> Parts {get;set;}
}

public class Parts 
{
     public string Prop1 {get;set;}
     public string Prop2 {get;set;}
}

But the comming in url is quite nasty.

It has this form

dhxGridObj_d3BIc6JfDidc_1_0=&dhxGridObj_d3BIc6JfDidc_1_1=sssss&dhxGridObj_d3BIc6JfDidc_1_2=ssssss& dhxGridObj_d3BIc6JfDidc_2_0=&dhxGridObj_d3BIc6JfDidc_2_1=aaaa&dhxGridObj_d3BIc6JfDidc_2_2=aaaaa

It has three parts separated with underscore

dhxGridObj_d3BIc6JfDidc_2_1

Some id dhxGridObj_d3BIc6JfDidc
Row id 2
Cell id 1

I'm wondering what would be the best way bind this to my model.

I was thinking of renaming this dhxGridObj_d3BIc6JfDidc_2_1 to model[2].Prop1 Where would be the best place to do this ?

Darin Dimitrov · Accepted Answer · 2011-04-06 12:29:36Z

2

Oh yeah, that's a hell of an ugly request string. A custom model binder is the way to parse this beast until you find a real solution to this problem which of course is fixing the system sending this crap to conform to the default model binder syntax.

And here's an example of some scratch code that might put you on the right track:

public class MyModelBinder : DefaultModelBinder
{
    private const string Prefix = "dhxGridObj_d3BIc6JfDidc";

    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var model = base.BindModel(controllerContext, bindingContext) as Model;
        var request = controllerContext.HttpContext.Request;
        model.Parts = request
            .Params
            .Keys
            .OfType<string>()
            .Select(key => Regex.Match(key, Prefix + "_([0-9]+)_([0-9]+)"))
            .Where(x => x.Success)
            .Select(x => new
            {
                Row = x.Groups[1].Value,
                Col = x.Groups[2].Value
            })
            .GroupBy(x => x.Row)
            .Select(x => new Parts
            {
                Prop1 = request[string.Format("{0}_{1}_{2}", Prefix, x.Key, x.ElementAt(0).Col)],
                Prop2 = request[string.Format("{0}_{1}_{2}", Prefix, x.Key, x.ElementAt(1).Col)],
            });
        return model;
    }
}

which will be registered in Application_Start:

ModelBinders.Binders.Add(typeof(Model), new MyModelBinder());

edited Apr 6, 2011 at 12:29

answered Apr 6, 2011 at 11:55

Darin Dimitrov

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5 Comments

user256034 Over a year ago

Forgot to mention there is also some validation going on on the Parts class. I've had a look at the defaultmodelbinder class.There're couple of methods to override. Could you give a hint which one would be the best for this ?

Darin Dimitrov Over a year ago

@user256034, you derive from DefaultModelBinder and override the BindModel method where you perform the logic of parsing those ugly query string parameters and binding them to their corresponding property values.

user256034 Over a year ago

Wow this awesome. Works like a charm. But I guess I have to do the validation by myself, don't I ?

Darin Dimitrov Over a year ago

@user256034, what kind of validation do you need? You could decorate your model properties with the necessary attributes.

user256034 Over a year ago

Yes , I meaned DataAnnotations. I have on some properties of the Parts class some attributes. But I don't see the place where the validation should happen.

Farzin Zaker · Accepted Answer · 2011-04-06 11:57:37Z

0

You should not use query string parameters in url of your MVC application. the best for this is Url routes. you can find a good article for routes in MVC here :

http://weblogs.asp.net/scottgu/archive/2007/12/03/asp-net-mvc-framework-part-2-url-routing.aspx

answered Apr 6, 2011 at 11:57

Farzin Zaker

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1 Comment

Farzin Zaker Over a year ago

but this is big hole in MVC Application.

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