Share Dot Net Experience
Backgroundworker in C#.Net
Introduction:
Today, Develpers use threading
in their Project. So Today, I will explaining threading and threading Concepts.I
am using Backgroundworker and Timer.
BackgroundWorker:
1.
It is a light weight Component.
2.
It makes threads easy to implement in
Windows Form.
3.
UI doesn’t freeze .Because Intensive task
needs to be done on another Thread.
Three Threads in
Dot Net:
1.
Thread
2.
ThreadPool
3.
Backgroundworker
We
will discuss about first 2 in later Articles.Now we discuss about
Backgroundworker.
Three Events in Backgroundworker:
1)
Dowork Event.
2)
ProgressChanged Event.
3)
RunWorkerCompleted Event.
1) Dowork Event:
First, Dowork event
will start.
User can give a
expensive code in this Event.
2) ProgressChanged Event:
add
code to indicate the progress, such as updating the user interface.
3) RunWorkerCompleted Event:
It is raised when the background
worker has completed.
How
to Start Backgroundworker?
Using backgroundworker1.RunWorkAsync();
How
to Stop Backgroundworker?
Using backgroundworker1. CancelAsync ();
Where
to set RunWorkAsync() and CancelAsync ()?
You can set where ever you want .
For
Eg:
We have Two Button. One is Start Thread and
another One is Stop Thread.
·
Call RunWorkAsync()
in Start Thread Button.
·
Call CancelAsync () in Stop Thread Button.
I
think, you get idea about Background worker and Thread.Now we will go to our
Project.This is a Simple Project.
Project Name: File(s)TransferSystem(FTS).
Project Description: Copy file(s) One location to another
location.
This
following message will show when user doesn’t true workerSupportsCancellation.
Step:1
User will declare a namespace for
Directory,that is called “System.IO”.
Step:2
User will declare for SorucePath and Designation path using string Data Type.
Step:3
Use Backgroundworker
nad One button in the Project
Step:4
Create a Two
Method for create Directory and Copy file(s) from One Directory to another
Directory.
Method Name:
CreateDirectory and assign a Parameter.
Method Desc:
Create Directory in the User Specified .Method also check whether Directory
exists.
Method Name: fileCopy
and assign two Parameter.
Method Desc: file(s)
Copy from One locaiton to another location.
Step:5
Backgroundworker_Dowork Event:
call fileCopy method.
Backgroundworker_RunWorkerCompleted
Event: To cancel backgrounderworker using Backgroundworker1.CancelAsync() method.
Step:6
Button1_Click
Event:Call Backgroundworker1.RunWorkerAsync() method.
How
it will Work?
Backgroundworker
will start when User Press “Button1”.
After file(s) Transfer Backgroundworker will
stop.
Note:
Before run application.Please follow this
step.
Go To Backgroundworker
Propoerty
Change WorkerSupportsCancellation
false to true.
Conclusion:
Thanks for reading this Article.I hope , It
will help you.Please send your comments and Feedback.
ArrayList in C#.net
 |
|
First time, User uses this
ArrayList class this error will occur.
Reason: Because user doesn’t declare a namespace
for ArrayList.
Solution: Declare Namespace Using System.Collection.
In this Sample Project, I am using
enumeration and ArrayList.
|
In this
Example, I am creating an enumeration and Call that enumeration into ArrayList
and sort that ArrayList.
Some useful Methods in ArrayList:
- Add
- AddRange
- Remove
- RemoveAt
- Sort
- RemoveRange
Add:
User can add a information into ArrayList
Using Add Method.
This is a Simple
Example for Add Method.
AddRange:
Add the elements of an ICollection to the end of the ArrayList.
ICollection:
· It is an Interface. Because it starts with “I”. Generally, “I” is
called Interface.
· Defines size, enumerators, and
synchronization methods for all nongeneric collections.
Here, I give a sample code for AddRange Method for ArrayList
create a two enumeration .One is ComName and
another one is ComPort.
Remove:
User can remove a list of items in
ArrayList.
User can specify a Word.
RemoveAt:
User can remove a list of items in
ArrayList.
User can specify a Index no.
RemoveRange:
User can remove
a list of items in ArrayList.
User can
specify range of remove.