Receive query string array in ASP.NET?

Question

This is my URI encoded query string as seen in the browser:

?itemsOnly=true&addedArticles%5B%5D=202&addedArticles%5B%5D=011&addedArticles%5B%5D=280&addedArticles%5B%5D=208&addedArticles%5B%5D=020

This is the relevant part of my query string as seen in the Request.QueryString[1] property in ASP.NET:

"202,011,280,208,020"

Even though the query string is on the request, my controller ignores it.

I have tried the following

public ActionResult ActionName(bool itemsOnly = false, string addedArticles = "")

public ActionResult ActionName(bool itemsOnly = false, string[] addedArticles = null)

public ActionResult ActionName(bool itemsOnly = false, IEnumerable<string> addedArticles = null)

But in each case addedArticles has been empty.

How do I tell my ASP.NET controller to save Request.QueryString[1] to a typed variable?

What do you mean by ASP.NET ? You mean ASP.NET MVC ? Or Web Api ? Or ASP.NET Core ? These are 3 different things. — Fabjan
– Fabjan, Commented May 15, 2018 at 15:22
What is the %5B%5D in your URI encoded query string? Could it be that the name is wrong? — user5441558
– user5441558, Commented May 15, 2018 at 15:24

Tarek · Accepted Answer · 2018-05-15 16:00:40Z

2

Your controller action should be

public ActionResult ActionName(string[] addedArticles, bool itemsOnly = false)

and you could send to it a query string like

?addedArticles=[X]&addedArticles=[X2]&addedArticles=[X3]

Where [X], [X2], [X3]... are your strings.

You could try and use this to encode your query string

public static string ToQueryString(this NameValueCollection self)
            => string.Join("&", self.AllKeys.Select(a => a + "=" + HttpUtility.UrlEncode(self[a])));

edited May 15, 2018 at 16:00

answered May 15, 2018 at 15:26

Tarek

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2 Comments

penleychan Over a year ago

Your controller action won't even compile. Optional parameters must appear after all required parameters.

Tarek Over a year ago

True, I just coped the thing quickly, I'll make the change. Thanks

Du Nguyễn Phan · Accepted Answer · 2018-05-17 04:36:12Z

You may want to use ModelBinder

public ActionResult ActionName (CustomRequest request) {

}

[ModelBinder(typeof(CustomModelBinder))]
public class CustomRequest
{
    public bool itemOnly;
    public string[] addedArticles;
}

public class CustomModelBinder : IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var request = controllerContext.RequestContext.HttpContext.Request;
        var itemOnly =bool.Parse( request.QueryString["itemOnly"]);
        var addedArticles = request.QueryString["addedArticles"].Split(',');

        return new CustomRequest(){itemOnly=itemOnly,addedArticles= addedArticles};
    }
}

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