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why is "this" read-only?
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This message was discovered on ASPFriends.com 'aspngcs' list.
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Edward Tanguay
-- Moved from [aspfreeforall] to [aspngcs] by Marcie Jones <Click here to reveal e-mail address> --

Why do I get the error "cannot assign to '<this>' because it is read-only?

How can I make it non-read-only or what is the problem here:

class DataMenu : DataTable {
public DataMenu() {
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter();
SqlConnection con = new
SqlConnection(ConfigurationSettings.AppSettings["con"]);
string theSql = "SELECT * FROM finPages ORDER BY PageSort";
SqlCommand cmd = new SqlCommand(theSql, con);
da.SelectCommand = cmd;
da.Fill(ds);
this = ds.Tables[0];
}
}

Thanks,
Edward Tanguay
www.tanguay.info

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Reply to this message...
 
    
Steve Sharrock (VIP)
I think you're going to have even further problems using DataMenu as a
subclass of DataTable. You won't be able to assign a DataTable to an
object of type DataMenu even if you do it from outside the class to
avoid the "this" reference. You will be unable to cast the DataTable to
a DataMenu (although you can go the other way because of the
inheritance).

Consider favoring composition over inheritance--that is, consider have
DataMenu contain an object of type DataTable.

2-cents on a Saturday afternoon.

Steve Sharrock
programmer / designer
www.sharkcode.com

-----Original Message-----
From: Edward Tanguay [mailto:Click here to reveal e-mail address]
Sent: Saturday, July 06, 2002 11:23 AM
To: aspngcs
Subject: [aspngcs] why is "this" read-only?

-- Moved from [aspfreeforall] to [aspngcs] by Marcie Jones
<Click here to reveal e-mail address> --

Why do I get the error "cannot assign to '<this>' because it is
read-only?

How can I make it non-read-only or what is the problem here:

class DataMenu : DataTable {
public DataMenu() {
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter();
SqlConnection con = new
SqlConnection(ConfigurationSettings.AppSettings["con"]);
string theSql = "SELECT * FROM finPages ORDER BY PageSort";
SqlCommand cmd = new SqlCommand(theSql, con);
da.SelectCommand = cmd;
da.Fill(ds);
this = ds.Tables[0];
}
}

Thanks,
Edward Tanguay
www.tanguay.info

_________________________________________________________________
Join the world's largest e-mail service with MSN Hotmail.
http://www.hotmail.com

| [aspngcs] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngcs.asp = JOIN/QUIT
Reply to this message...
 
    
Herbert Wildmeister
I'm not using a DataTable or anything ..., but I'm also looking for an efficient workaround for CS1604
I'm trying to achieve something like [Code]this = new MyClass();[/Code]
i.e. I want to redirect all refferences to this to a different object of the same type. I've read that C# stores a list of all references to an object (for garbage collection). Can I access this list? Can I redirect all references in this list? How? Or is there a different solution to my problem.
Thanks a lot.
Reply to this message...
 
 
System.Configuration.ConfigurationSettings
System.Data.DataSet
System.Data.DataTable
System.Data.SqlClient.SqlCommand
System.Data.SqlClient.SqlConnection
System.Data.SqlClient.SqlDataAdapter




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