return more then one JSON object in the same response and parsing it

i have the following code: (simplified for readability)

C#

        foreach(DataRow 开发者_如何学GodRow in myDS.Tables[0].Rows){
            Company myCompany = new Company();
            myCompany.id = int.Parse(dRow["id"].ToString());
            Companies.Add(myCompany);
        }

        JavaScriptSerializer serializer = new JavaScriptSerializer();
        Response.Write(serializer.Serialize(Companies));
        Response.End();

jQuery

$.getJSON('ajax.aspx?what=' + $('input[name="what"]').val() + '&where=' + $('input[name="what"]').val(), function (data) {
    $.each(data, function (key, val) {
        var myCompany = new function () {
            this.id = val.id;
        }
        Companies.push(myCompany);
    });
});

Now, i have another object in the C# code, which is named Cities and i would like to return it in the same request.

something like

Response.Write(serializer.Serialize(Companies));
Response.Write(serializer.Serialize(Cities));
Response.End()

and offcourse parse it on the Client side.

how can i do something like that?

You could wrap the two properties into an anonymous object:

var result = new { Cities = Cities, Companies = Companies };
Response.Write(serializer.Serialize(result);
Response.End();

Or if you are using some old .NET version which doesn't support anonymous objects you could define a wrapper class:

public class Wrapper
{
    public IEnumerable<Cities> Cities { get; set; }
    public IEnumerable<Company> Companies { get; set; }
}

and then:

Wrapper result = new Wrapper();
wrapper.Cities = Cities;
wrapper.Companies = Companies;
Response.Write(serializer.Serialize(wrapper);
Response.End();

Also fix your AJAX call as you are not properly url encoding your parameters:

var data = { 
    what: $('input[name="what"]').val(), 
    where: $('input[name="what"]').val() 
};
$.getJSON('ajax.aspx', data, function (data) {
    $.each(data.Companies, function (index, val) {
        var myCompany = new function () {
            this.id = val.id;
        }
        Companies.push(myCompany);
    });
});

You need to create Object containing both collections like this:

{
"Cities": { ... Cities Collection ... },
"Companies": { ... Companies Collection ... }
}

So create one Object like

[Serializable]
public class Output {
    Collection<City> cities;
    Collection<Company> companies;
}

then will this object with data and output it