I have a collection inside a class, sometimes when I add to the collection,
I get the error "At least one object must implement IComparable".
What does the error mean ?
Thanks.
Public Class SessionClass
Private Quotes As Collection = New Collection
Sub NewQuote(ByVal Message As String)
Dim swError As StreamWriter
Try
Quotes.Add(Message) '--error here
Catch ex As Exception
swError = New StreamWriter(Application.StartupPath &
"\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" &
vbCrLf, True)
swError.Write(Now & " Session - NewQuote - error = " &
ex.Message)
swError.Close()
End Try
End Sub 8 14731
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
I have a collection inside a class, sometimes when I add to the collection,
I get the error "At least one object must implement IComparable".
What does the error mean ?
Thanks.
Public Class SessionClass
Private Quotes As Collection = New Collection
Sub NewQuote(ByVal Message As String)
Dim swError As StreamWriter
Try
Quotes.Add(Message) '--error here
Catch ex As Exception
swError = New StreamWriter(Application.StartupPath &
"\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" &
vbCrLf, True)
swError.Write(Now & " Session - NewQuote - error = " &
ex.Message)
swError.Close()
End Try
End Sub
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
I have a collection inside a class, sometimes when I add to the collection,
I get the error "At least one object must implement IComparable".
What does the error mean ?
Thanks.
Public Class SessionClass
Private Quotes As Collection = New Collection
Sub NewQuote(ByVal Message As String)
Dim swError As StreamWriter
Try
Quotes.Add(Message) '--error here
Catch ex As Exception
swError = New StreamWriter(Application.StartupPath &
"\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" &
vbCrLf, True)
swError.Write(Now & " Session - NewQuote - error = " &
ex.Message)
swError.Close()
End Try
End Sub
Thank you for your reply.
Can you report what "Message" contains when you get the exception?
ex.Message = At least one object must implement IComparable
Also can you report what the 2-nd element of the collection contains
at the time of exception?
I did not catch the value of the 2nd element of the collection when the
program broke, and this error does not happen all the time.
May I know why do you need to know the value of the 2nd element of the
collection ?
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
Can you please tell me why simple arraylist will be better than collection ?
What did you mean by "collection uses a keyvalue entry" ?
Thanks.
<to**************@uniroma1.itwrote in message
news:11*********************@m79g2000cwm.googlegro ups.com...
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
>I have a collection inside a class, sometimes when I add to the collection, I get the error "At least one object must implement IComparable". What does the error mean ? Thanks.
Public Class SessionClass Private Quotes As Collection = New Collection Sub NewQuote(ByVal Message As String) Dim swError As StreamWriter
Try Quotes.Add(Message) '--error here Catch ex As Exception swError = New StreamWriter(Application.StartupPath & "\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" & vbCrLf, True) swError.Write(Now & " Session - NewQuote - error = " & ex.Message) swError.Close() End Try End Sub
hi :)
It seems you need to read some docs about the object you are using: http://msdn.microsoft.com/library/de...l/vamthadd.asp
-tom
fniles ha scritto:
Thank you for your reply.
Can you report what "Message" contains when you get the exception?
ex.Message = At least one object must implement IComparable
Also can you report what the 2-nd element of the collection contains
at the time of exception?
I did not catch the value of the 2nd element of the collection when the
program broke, and this error does not happen all the time.
May I know why do you need to know the value of the 2nd element of the
collection ?
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
Can you please tell me why simple arraylist will be better than collection ?
What did you mean by "collection uses a keyvalue entry" ?
Thanks.
<to**************@uniroma1.itwrote in message
news:11*********************@m79g2000cwm.googlegro ups.com...
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
I have a collection inside a class, sometimes when I add to the
collection,
I get the error "At least one object must implement IComparable".
What does the error mean ?
Thanks.
Public Class SessionClass
Private Quotes As Collection = New Collection
Sub NewQuote(ByVal Message As String)
Dim swError As StreamWriter
Try
Quotes.Add(Message) '--error here
Catch ex As Exception
swError = New StreamWriter(Application.StartupPath &
"\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" &
vbCrLf, True)
swError.Write(Now & " Session - NewQuote - error = " &
ex.Message)
swError.Close()
End Try
End Sub
Thanks.
They "key" in the "add" method is an optional parameter. I do not use the
key when adding a member to the collection.
Can you please tell me why simple arraylist will be better than collection ?
May I know why do you need to know the value of the 2nd element of the
collection ?
<to**************@uniroma1.itwrote in message
news:11*********************@m79g2000cwm.googlegro ups.com...
hi :)
It seems you need to read some docs about the object you are using: http://msdn.microsoft.com/library/de...l/vamthadd.asp
-tom
fniles ha scritto:
>Thank you for your reply.
Can you report what "Message" contains when you get the exception?
ex.Message = At least one object must implement IComparable
Also can you report what the 2-nd element of the collection contains
at the time of exception?
I did not catch the value of the 2nd element of the collection when the program broke, and this error does not happen all the time. May I know why do you need to know the value of the 2nd element of the collection ?
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
Can you please tell me why simple arraylist will be better than collection ? What did you mean by "collection uses a keyvalue entry" ?
Thanks.
<to**************@uniroma1.itwrote in message news:11*********************@m79g2000cwm.googlegr oups.com...
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
I have a collection inside a class, sometimes when I add to the collection, I get the error "At least one object must implement IComparable". What does the error mean ? Thanks.
Public Class SessionClass Private Quotes As Collection = New Collection Sub NewQuote(ByVal Message As String) Dim swError As StreamWriter
Try Quotes.Add(Message) '--error here Catch ex As Exception swError = New StreamWriter(Application.StartupPath & "\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" & vbCrLf, True) swError.Write(Now & " Session - NewQuote - error = " & ex.Message) swError.Close() End Try End Sub
I am especially fond of 3 objects which I use often:
arraylist
hashtable
sortedlist
so even if technically the arraylist is a collection, conceptually,
when storing single values,
I prefer the arraylist, also because it is often the case that the
insertion order is meaningful.
In case of exception, if you do not look at what object you actually
stored, it
would be hard to spot the cause of error.
>From the error message it's like you are storing objects different from
strings, which
the compiler does not know how to compare because an IComparable
implemenmtation is missings althought that would not seem possible with
the signature "NewQuote(ByVal Message As String)" but perhaps you
changed something for posting purposes...
-t
fniles ha scritto:
Thanks.
They "key" in the "add" method is an optional parameter. I do not use the
key when adding a member to the collection.
Can you please tell me why simple arraylist will be better than collection ?
May I know why do you need to know the value of the 2nd element of the
collection ?
<to**************@uniroma1.itwrote in message
news:11*********************@m79g2000cwm.googlegro ups.com...
hi :)
It seems you need to read some docs about the object you are using: http://msdn.microsoft.com/library/de...l/vamthadd.asp
-tom
fniles ha scritto:
Thank you for your reply.
Can you report what "Message" contains when you get the exception?
ex.Message = At least one object must implement IComparable
Also can you report what the 2-nd element of the collection contains
at the time of exception?
I did not catch the value of the 2nd element of the collection when the
program broke, and this error does not happen all the time.
May I know why do you need to know the value of the 2nd element of the
collection ?
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
Can you please tell me why simple arraylist will be better than
collection ?
What did you mean by "collection uses a keyvalue entry" ?
Thanks.
<to**************@uniroma1.itwrote in message
news:11*********************@m79g2000cwm.googlegro ups.com...
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
I have a collection inside a class, sometimes when I add to the
collection,
I get the error "At least one object must implement IComparable".
What does the error mean ?
Thanks.
Public Class SessionClass
Private Quotes As Collection = New Collection
Sub NewQuote(ByVal Message As String)
Dim swError As StreamWriter
Try
Quotes.Add(Message) '--error here
Catch ex As Exception
swError = New StreamWriter(Application.StartupPath &
"\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" &
vbCrLf, True)
swError.Write(Now & " Session - NewQuote - error = " &
ex.Message)
swError.Close()
End Try
End Sub
If I need to add and remove items from the arraylist or collection, which
one is faster: arraylist or collection ?
Thank you.
<to**************@uniroma1.itwrote in message
news:11*********************@m73g2000cwd.googlegro ups.com...
>I am especially fond of 3 objects which I use often:
arraylist
hashtable
sortedlist
so even if technically the arraylist is a collection, conceptually,
when storing single values,
I prefer the arraylist, also because it is often the case that the
insertion order is meaningful.
In case of exception, if you do not look at what object you actually
stored, it
would be hard to spot the cause of error.
>>From the error message it's like you are storing objects different from
strings, which
the compiler does not know how to compare because an IComparable
implemenmtation is missings althought that would not seem possible with
the signature "NewQuote(ByVal Message As String)" but perhaps you
changed something for posting purposes...
-t
fniles ha scritto:
>Thanks. They "key" in the "add" method is an optional parameter. I do not use the key when adding a member to the collection.
Can you please tell me why simple arraylist will be better than collection ? May I know why do you need to know the value of the 2nd element of the collection ?
<to**************@uniroma1.itwrote in message news:11*********************@m79g2000cwm.googlegr oups.com...
hi :)
It seems you need to read some docs about the object you are using: http://msdn.microsoft.com/library/de...l/vamthadd.asp
-tom
fniles ha scritto:
Thank you for your reply.
Can you report what "Message" contains when you get the exception? ex.Message = At least one object must implement IComparable
Also can you report what the 2-nd element of the collection contains
at the time of exception? I did not catch the value of the 2nd element of the collection when the program broke, and this error does not happen all the time. May I know why do you need to know the value of the 2nd element of the collection ?
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry. Can you please tell me why simple arraylist will be better than collection ? What did you mean by "collection uses a keyvalue entry" ?
Thanks.
<to**************@uniroma1.itwrote in message news:11*********************@m79g2000cwm.googlegr oups.com...
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
I have a collection inside a class, sometimes when I add to the collection, I get the error "At least one object must implement IComparable". What does the error mean ? Thanks.
Public Class SessionClass Private Quotes As Collection = New Collection Sub NewQuote(ByVal Message As String) Dim swError As StreamWriter
Try Quotes.Add(Message) '--error here Catch ex As Exception swError = New StreamWriter(Application.StartupPath & "\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") & ".txt" & vbCrLf, True) swError.Write(Now & " Session - NewQuote - error = " & ex.Message) swError.Close() End Try End Sub
Arraylists are very fast. I have never compared with collection but you
can make some experiment and measure yourself how long they take. Also
for a log, I guess you may need ordered events (Ilist interface).
If you need to make extensive removal take a look at hashtables also or
better a typed collection Dictionary(Of T1, T2)
[System.Collections.Generic.Dictionary]
because removal (not removeat()) isn't O(1) in arraylist.
If you do some performance experiment please let us know the results.
-t
If I need to add and remove items from the arraylist or collection, which
one is faster: arraylist or collection ?
Thank you.
<to**************@uniroma1.itwrote in message
news:11*********************@m73g2000cwd.googlegro ups.com...
I am especially fond of 3 objects which I use often:
arraylist
hashtable
sortedlist
so even if technically the arraylist is a collection, conceptually,
when storing single values,
I prefer the arraylist, also because it is often the case that the
insertion order is meaningful.
In case of exception, if you do not look at what object you actually
stored, it
would be hard to spot the cause of error.
>From the error message it's like you are storing objects different from
strings, which
the compiler does not know how to compare because an IComparable
implemenmtation is missings althought that would not seem possible with
the signature "NewQuote(ByVal Message As String)" but perhaps you
changed something for posting purposes...
-t
fniles ha scritto:
Thanks.
They "key" in the "add" method is an optional parameter. I do not use the
key when adding a member to the collection.
Can you please tell me why simple arraylist will be better than
collection ?
May I know why do you need to know the value of the 2nd element of the
collection ?
<to**************@uniroma1.itwrote in message
news:11*********************@m79g2000cwm.googlegro ups.com...
hi :)
It seems you need to read some docs about the object you are using: http://msdn.microsoft.com/library/de...l/vamthadd.asp
-tom
fniles ha scritto:
Thank you for your reply.
Can you report what "Message" contains when you get the exception?
ex.Message = At least one object must implement IComparable
Also can you report what the 2-nd element of the collection contains
at the time of exception?
I did not catch the value of the 2nd element of the collection when
the
program broke, and this error does not happen all the time.
May I know why do you need to know the value of the 2nd element of the
collection ?
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
Can you please tell me why simple arraylist will be better than
collection ?
What did you mean by "collection uses a keyvalue entry" ?
Thanks.
<to**************@uniroma1.itwrote in message
news:11*********************@m79g2000cwm.googlegro ups.com...
hi
Can you report what "Message" contains when you get the exception?
Also can you report what the 2-nd element of the collection contains
at the time of exception?
-tom
PS
I do not see why not to use a simple arraylist here. The collection
uses a keyvalue entry.
fniles ha scritto:
I have a collection inside a class, sometimes when I add to the
collection,
I get the error "At least one object must implement IComparable".
What does the error mean ?
Thanks.
Public Class SessionClass
Private Quotes As Collection = New Collection
Sub NewQuote(ByVal Message As String)
Dim swError As StreamWriter
Try
Quotes.Add(Message) '--error here
Catch ex As Exception
swError = New StreamWriter(Application.StartupPath &
"\AQErrorLog-" & lIndex & "-" & Date.Now.ToString("MMddyy") &
".txt" &
vbCrLf, True)
swError.Write(Now & " Session - NewQuote - error = " &
ex.Message)
swError.Close()
End Try
End Sub This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Steve Teeples |
last post by:
Can someone explain how to cast an object to a specific type during runtime?
// This line of code tells me the objects type.
System.Type type = System.Type.GetType("string of the type");
//...
|
by: ECathell |
last post by:
I have a class called products. In my maintenance application I am instantiating two versions of this class.
mProduct is used in all transactions and changes
mProduct_original is loaded at the...
|
by: Alexander Walker |
last post by:
Hello
I am using a Dictionary to store some queues which store instances of a class
that I have written
I would like to be able to determine whether a particular queue already contains
an...
|
by: AAJ |
last post by:
Hi all
I have some objects that I add to an ArrayList. Each object is from the same
class and has methods etc. Each can be identified by a unique property, in
this case PK
e.g.
PK =1 for...
|
by: preport |
last post by:
Hopefully someone can clarify some of this for me.
I am confused on what classes I should implement if I want to utilize the
List<>.BinarySearch() and Sort()
My class currently looks like:
...
| |
by: FacultasNetDeveloper |
last post by:
I am extending FileSystemInfo class so that I can Implement Icomparable. My
custom class looks like:
Class FSFileSystemInfo
Inherits FileSystemInfo : Implements Icomparable
Function...
|
by: Ron M. Newman |
last post by:
Hi,
Is there a quick way to know if a given object implements IComparable?
(without casting or anything like that). Something that uses reflection?
Thanks
-Ron
|
by: Sjaakie |
last post by:
Hi,
I'm, what it turns out to be, fooling around with 3-tier design.
At several websites people get really enthusiastic about using custom
dataobjects instead of datasets/-tables.
While trying to...
|
by: serge calderara |
last post by:
Dear all,
What is the proper way to check if two object are equal ?
I do not mean equal on Object type only but also object value's
thnaks for help
regards
serge
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers,...
| |
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated ...
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence...
| |