ASP.Net Querystring - Multiple values

Question

Is it possible to pass multiple values to a single Querystring parameter? Here is what I am thinking:

index.aspx?loc=wi&mi&mn

or

index.aspx=?loc=wi&loc=mi&loc=mn

Something like that. I am sure I could pass them in other ways and possibly explode the inner contents (sorry - split would be better .net term). But I would rather do this in a way that I could easily extract via code similar to this:

for i = 1 to request.querystring("loc").count
    'do some stuff here
next i

Answer 1

You can pass multiple values by using a separator between them.

C#

var locations = new List<string> { "wi", "mi", "mn" };
var locationsCommaSeparated = string.Join(",", files);
Response.Redirect("index.aspx?loc=" + locationsCommaSeparated);

VB

Dim locations = New List(Of String)() From { _
    "wi", _
    "mi", _
    "mn" _
}
Dim locationsCommaSeparated = String.Join(",", files)
Response.Redirect("index.aspx?loc=" + locationsCommaSeparated)

On the receiving end, you can then split them back out.

C#

var locationsCommaSeparated = Request.QueryString["loc"].ToString();
var locations = locationsCommaSeparated.Split(',');

foreach(var location in locations)
{
    //do something
}

VB

Dim locationsCommaSeparated = Request.QueryString("loc").ToString()
Dim locations = locationsCommaSeparated.Split(","C)

For Each location As var In locations
    'do something
Next

Note, I'm a C# programmer, so I used an automatic code converter to convert it to VB. Results may not be idiomatic valid VB.

Careful care would need to be taken if the value you're passing would contain the character you're using as a delimiter. Since it appears you're just passing state abbreviations, you should be safe in this particular instance.

Answer 2

try this

    ArrayList arr = new ArrayList();
    arr.Add(“file1″);
    arr.Add(“file2″);
    arr.Add(“file3″);
    string arry = String.Join(“,”, ((string[])arr.ToArray(typeof(String))));
    Response.Redirect(“index.aspx?file=” + arry);