CODEWITHSUNDEEP
c#c#-4.0
Learner
Learner

Reputation: 563

Length of array doesn't seen in Intellisense

Now i send message array as a query string to another page.but when i catch the next page we have a arr.Length know ( normally it shows the intellisense) but in this case it doesn't show.

here is msg_arr pass to the another page

 private void check(string keyword , params Array[] msg_arr)
    {
        switch (keyword.ToUpper())
        {
            case  "SETTELG":
                Response.Redirect("../SMSFunction/SeenSMS.ascx?value=1&arr" + msg_arr);

                break;

Below code is the next page i wanted to catch that passed value & array(msg_arr).but length doen't work

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string Moose = Request.QueryString[1];
        }

        if (msg_arr != null)
        {
            if ((msg_arr.Length == 3) && (msg_arr[1].ToLower() == "slett"))

            {

            }


        }
    }

here is the second code screenshot,you can see Length not shown here is the second code screenshot,you can see Length not shown

Upvotes: 0

Views: 230

Answers (2)

Adeel Ahmed
Adeel Ahmed

Reputation: 215

You cannot pass whole collection in query string. Only thing you can do is pass an element of collection. i.e. array cannot be passed but array[0].toString() can be. Please do it in a simple way through session variable. Store array in Session variable in Page1.aspx and retrieve on Page2.aspx. Sample code is as follows

Page1.aspx 

   protected void Page_Load(object sender, EventArgs e) 
    { 
      int[] array = { 1, 2, 3, 4, 5 }; 
      Session["Array"] = array; Response.Redirect("About.aspx"); 
    }

Page2.aspx 

 protected void Page_Load(object sender, EventArgs e) 
    { 
      int[] array; 
      if (Session["Array"] != null) 
      { 
         array = (int[])Session["Array"]; 
         if (array.Length == 3) 
         { 
            /////implementaion 
         } 
      } 
    }

Upvotes: 1

Damien_The_Unbeliever
Damien_The_Unbeliever

Reputation: 239724

Quite a few things wrong here.

private void check(string keyword , params Array[] msg_arr)

Is this function really being passed an array of Arrays? I'd have thought string[] or object[] to be a more likely type to be passed.

Response.Redirect("../SMSFunction/SeenSMS.ascx?value=1&arr" + msg_arr);

That's going to call ToString() on msg_arr, which, it being an array, will produce a result like this:

"../SMSFunction/SeenSMS.ascx?value=1&arrSystem.Array[]"

Array doesn't override ToString(), so you get the one from Object which outputs the fully qualified name of the type - which I assume isn't what you want.

Finally, we reach your second piece of code, but you've not even shown us any code which attempts to set the new msg_arr variable. But it's not going to be able to get the original value of msg_arr, since you've not passed that across yet.

You need to decide how you want to pack your array into the query string. If, say, msg_arr should have been an array of readable strings (params string[] msg_arr in the check definition), then you might try something like:

Response.Redirect("../SMSFunction/SeenSMS.ascx?value=1&arr=" + string.Join("|",msg_arr));

where | is a character that shouldn't appear in the strings being passed. (String.Join)

You can then reconstruct it back into an array with something like:

protected void Page_Load(object sender, EventArgs e)
{
    string[] msg_arr = Request.QueryString["arr"].Split('|');
    /* rest of method */

(String.Split)

Of course, there may be a concern now if the length of strings (or the number of them) is too large, it may not be appropriate to pass them via a query string at all.

Upvotes: 3

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