Passing List of objects via querystring to MVC Controller

Question

I've got a situation where I need to pass a List of objects to an MVC Controller, but I'm not sure how to format this in the querystring. The reason I would want to do this is because this is not a web application, it's a web service that accepts data via the querystring and routes it to a controller that does the work.

So, given a class called MyParam with properties A & B, how can I construct a querystring that will pass data to the following controller method:

public ActionResult MyMethod(List<MyParam> ParamList)

I've tried using the MVC framework to RedirectToAction and RedirectToResult to see what it comes up with, but I assume that my n00bness with MVC is causing me to make a mistake because it never passes the data correctly and MyMethod always has null for the parameter.

Thanks in advance!

Darin Dimitrov · Accepted Answer · 2011-04-27 15:13:13Z

14

You may find the following blog post useful for the wire format of lists you need to use if you want the default model binder to successfully parse the request into a strongly typed array of objects. Example of query string:

[0].Title=foo&[0].Author=bar&[1].Title=baz&[1].Author=pub...

where:

public class Book
{
    public string Title { get; set; }
    public string Author { get; set; }
}

will successfully bind to:

public ActionResult MyMethod(IEnumerable<Book> books) { ... }

edited Apr 27, 2011 at 15:13

answered Apr 27, 2011 at 15:07

Darin Dimitrov

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7 Comments

dudemonkey Over a year ago

It binds, but doesn't actually pass the data. I just get the default values for each object.

Darin Dimitrov Over a year ago

@dudemonkey, this should work, I am using it almost on a daily basis. Checkout the blog post which provides specific examples and double check that you don't have typos.

dudemonkey Over a year ago

you're right. In my code I didn't have accessor (get/set) methods for the properties. Once I added them in, it worked perfectly.

Breandán Over a year ago

Note, if the book class had an array prop public string[] References{ get; set;} then the format would be [0].References[0]=foo&[0].References[1]=bar...

Kevin Heidt Over a year ago

This was very helpful for even when you're not passing an array via get, but a single object. IE ?Title=foo&Author=bar for a passing a single book object via GET. Thanks.

|

Tejs · Accepted Answer · 2011-04-27 15:15:48Z

0

I've found that the JsonValueProvider works much better than the normal ValueProvider for binding to a list. Simply convert your data to a JSON object like so:

<YourRoute>?ParamList=[{SomeProperty:'Value'},{SomeProperty:'Value'}];

And the JsonValueProvider will take care of the rest. This is assuming you have the ability to say "post this data as Json".

I also disclaim whether or not this would be a good idea.

answered Apr 27, 2011 at 15:15

Tejs

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Comments

Jonathan Kaufman · Accepted Answer · 2011-04-27 15:17:22Z

0

Ok, based on the information provided I don't think you want what you think you want. In your case on the client you POST the data to the controller. Not use a querystring.

ok since you have to use querystring. my new answer: serialize object, convert it to base64 string and pass it, then convert it back.

edited Apr 27, 2011 at 15:17

answered Apr 27, 2011 at 15:05

Jonathan Kaufman

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2 Comments

dudemonkey Over a year ago

Unfortunately, as per the requirements, it has to be GET. Everything has to get passed via the querystring as this will be consumed by unsophisticated clients.

Jonathan Kaufman Over a year ago

I'll ask around but we will drink to you and your problems at lunch. Sorry.

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