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c#asp.net-mvcquery-string
Gleb
Gleb

Reputation: 1432

How to map query string to Dictionary of List

I'm using C# Asp.Net MVC and I want to get filters as parameter in my controller action.

I have a query string for filters. It is looks like so:

?page=2&groups%5B0%5D=group1&groups%5B1%5D=group2&category%5B0%5D=category1

How could I parse it to Dictionary<string, List<string>>?

Or to List<Filter>?

class Filter
{
    public string Name { get; set; }
    public List<string> Values { get; set; }
}

Upvotes: 2

Views: 2017

Answers (3)

Sarvesh Gupta
Sarvesh Gupta

Reputation: 85

This is case of custom model binding. we can create one by inheriting from System.Web.Mvc.IModelBinder:

 public class SearchModelBinder : IModelBinder
    {
        private NameValueCollection _queryString;

        private List<string> GetValues(string key)
        {
            return (_queryString.GetValues(key) ?? throw new InvalidOperationException()).ToList();
        }

        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            _queryString = controllerContext.HttpContext.Request.QueryString;

            return _queryString.AllKeys.Select(x => new Filter { Name = x, Values = GetValues(x) }).ToList();
        }
    }

And then in controller action (notice parameter attribute)

  public ActionResult Search([ModelBinder(typeof(SearchModelBinder))] List<Filter> filter)
    {
            // do something with filter
            return Content(filter.LastOrDefault()?.Name);
    }

Upvotes: 2

Gauravsa
Gauravsa

Reputation: 6524

You can simply do this:

Dictionary<string, string> keyValue = new Dictionary<string, string>();

foreach (String key in Request.QueryString.AllKeys)
{
   keyValue.Add(key, Request.QueryString[key] ?? string.Empty);
}

Upvotes: 0

Ilya
Ilya

Reputation: 45

In any action you already have some kind of query dictionary. Take a look at 

HttpContext.Request.Query

It contains property Keys and related to each key value

Upvotes: 1

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