Casting generics in C#4

Question

3.33/5 (3 votes)

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Hi,

Can anyone help me in casting the base class to Data Collection for an array list

dataServiceColl = new DataServiceCollectiongmcApp>();

GridView1.DataSource = dataServiceColl;

GridView1.EmptyDataText = "No Data Found.";

if (!Page.IsPostBack){

    Uri requestUri = GetQueryRequestUri();

    try  {

        if(authenticationRequired)

            {

service.SendingRequest += new EventHandler<sendingrequesteventargs>(service_SendingRequest);

    }  
 
   logMessage.AppendLine(String.Format("Request uri = '{0}'", requestUri.OriginalString)); 

   var result = service.Execute<gmcapp>(requestUri); 

   dataServiceColl.Load(result);  

  /* Here I am querying the data ,Here I need to type cast */
 
   GridView1.DataSource = dataServiceColl.Select(t => t.prod_desc ="Edibleitem"); 

   logMessage.AppendLine(String.Format("Retrieved '{0}' items", dataServiceColl.Count</gmcapp></sendingrequesteventargs>

Can anyone help me in casting the line i commented in the above code?

Posted 26-May-11 16:02pm

HEERAL_MS

Updated 26-May-11 17:49pm

thatraja

v5

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Sergey Alexandrovich Kryukov 26-May-11 22:23pm

Please, format your code yourself, I started but it's crewed up too much.
--SA

HEERAL_MS 26-May-11 22:44pm

Thx! I formatted it.
Any help appreciated!

Sergey Alexandrovich Kryukov 28-May-11 2:53am

It's not clear. There is no generic shown. Probably this is typo. Look at "new DataServiceCollectiongmcApp" -- only right angular bracket.

"Casting generic" sounds like oxymoron to me, as generics are designed to avoid type casting.
--SA

2 solutions

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Kim Togo · Answer 1 · 2011-05-27T08:09:00

Solution 1

I do not quite understand the question. But under Linq you can call .OfType[^] to filter out class based on a specified type.

And then you can rewrite the line to:

C#

// Only select on class ProducClass.
GridView1.DataSource = dataServiceColl.OfType<producclass>().Select(t => t.prod_desc ="EdibleItem");

Posted 27-May-11 8:09am

Kim Togo

Updated 27-May-11 20:54pm

v2

Comments

Sergey Alexandrovich Kryukov 28-May-11 2:57am

Kim, you had formatting mistakes (you did not replace angular brackets with HTML entities in the generic, so it was mangled. I tried to fix it -- don't you mind? Please check up if it's correct now and fix some more I did not do it right.
Also, please see my comment to OP's question. Still not clear.
--SA

Kim Togo 28-May-11 4:48am

Hi SA, thanks for fixing up. Yes if forgot to use HTML entities for brackets.

Sanjay J Patolia · Answer 2 · 2011-05-27T21:00:00

Yes it is,

Problem :

SQL

/* Here I am querying the data ,Here I need to type cast */
   GridView1.DataSource = dataServiceColl.Select(t => t.prod_desc ="Edibleitem");

Solution :

SQL

/* Here I am querying the data ,Here I need to type cast */
   GridView1.DataSource = dataServiceColl.Cast<yourcastingclass>.Select(t => t.prod_desc ="Edibleitem");</yourcastingclass>

It should work.

This may be usefull to you :)

Thanks :)