Continue to next step in a for..next loop only when the user press a button.
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I think you misunderstand what I mean with my words. I mean that someone can't give an opinion that should I use or not an For..Next loop because he don't know all the logic of my program. So why you want to comment the question instead of try to give a response. The question is very clear. If there's no answer , respond "it's not possible.". And about the reputation , I'm not interested , because I'm more interested about the answers of my questions.
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I'm using vb.net , and I have this situation : I have a button on the form( Mybutton1 ) . I have also a sub that contains a for..next loop :
.....
for I=1 to nr1
{.... some instructions...}
if condition1 then Mybutton1.enable=true
NextOn every step of this For loop , the button became enabled when a condition is true .In this case I want that this loop to stop until the user press the Button. ( the button's click event , at the end has some instructions that makes the button disabled again ) Is there any way to do this behavior ? Thank you !
This isn't something you would normally do, and prior to .NET 4.5 would be virtually impossible. (You could re-write your code to use a state-machine, but it wouldn't resemble a
Forloop.) However, if you're using .NET 4.5, you can create a hacky solution usingAsync/Await:Private _buttonClickedSource As TaskCompletionSource(Of Boolean)
Protected Sub MyButton_Click(ByVal sender As Object, ByVal args As EventArgs) Handles MyButton.Click
' Get the TaskCompletionSource that's waiting, if there is one.
' Clear the field, since we only want to wait for a single click.
Dim tcs As TaskCompletionSource(Of Boolean)
tcs = Interlocked.Exchange(_buttonClickedSource, Nothing)' If we're waiting for a button click, signal that we've receive one: If tcs IsNot Nothing Then tcs.TrySetResult(True) End IfEnd Sub
Private Async Function DoYourFunkyThing() As Task
...
For i = 1 To nr1
...
If condition1 Then
' Create a new TaskCompletionSource, and enable the button:
Dim tcs As New TaskCompletionSource(Of Boolean)()
Interlocked.Exchange(_buttonClickedSource, tcs)
MyButton.Enabled = True' Wait for the button to be clicked: Await tcs.Task ' Disable the button: MyButton.Enabled = False End If NextEnd Function
The compiler will re-write this method to use a state machine, but you can still write your code as if it was a
Forloop. Async (Visual Basic)[^] Asynchronous Programming with Async and Await (C# and Visual Basic)[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
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Ok , I give you some additional details : I'm using the form to edit , create and modify records form a database. The button for which I'm talking has all the necessary code to test the new record created by user , and if the test is done without problems , the new record is saved. But this button can test and save records one by one ( so if a user create a new record , he should press the button before create another ). Now , I have added a new function in my form : Copy paste records. So the user can select one ( or several ) existing records , and press copy on the right click menu. When a copy is made , a list is created that contains all the records that are copied and should be pasted. for the Paste actions , I have this For..next loop. But the records that are copied , should be pasted one by one. So a new record is created that is a copy of the first element on the copy-list. At this point , the loop should stop , and user can make the changes needed for this copy and after should press the button to do the actions needed and to save this record. After the loop can continue with the same logic for the other records. This is all. Can you give me a new idea ? Thank you !
dilkonika wrote:
for the Paste actions , I have this For..next loop. But the records that are copied , should be pasted one by one. So a new record is created that is a copy of the first element on the copy-list. At this point , the loop should stop , and user can make the changes needed for this copy and after should press the button to do the actions needed and to save this record. After the loop can continue with the same logic for the other records.
From this description you have given I would consider 2 approaches to your problem 1. The user has to individually copy / edit a duplicated row and then click on save 2. You allow the user to specify how many rows that they want to create, then allow them individually save each row. personally I feel if you continued on the path that you want to take it, It would make your application very hard to maintain.
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This isn't something you would normally do, and prior to .NET 4.5 would be virtually impossible. (You could re-write your code to use a state-machine, but it wouldn't resemble a
Forloop.) However, if you're using .NET 4.5, you can create a hacky solution usingAsync/Await:Private _buttonClickedSource As TaskCompletionSource(Of Boolean)
Protected Sub MyButton_Click(ByVal sender As Object, ByVal args As EventArgs) Handles MyButton.Click
' Get the TaskCompletionSource that's waiting, if there is one.
' Clear the field, since we only want to wait for a single click.
Dim tcs As TaskCompletionSource(Of Boolean)
tcs = Interlocked.Exchange(_buttonClickedSource, Nothing)' If we're waiting for a button click, signal that we've receive one: If tcs IsNot Nothing Then tcs.TrySetResult(True) End IfEnd Sub
Private Async Function DoYourFunkyThing() As Task
...
For i = 1 To nr1
...
If condition1 Then
' Create a new TaskCompletionSource, and enable the button:
Dim tcs As New TaskCompletionSource(Of Boolean)()
Interlocked.Exchange(_buttonClickedSource, tcs)
MyButton.Enabled = True' Wait for the button to be clicked: Await tcs.Task ' Disable the button: MyButton.Enabled = False End If NextEnd Function
The compiler will re-write this method to use a state machine, but you can still write your code as if it was a
Forloop. Async (Visual Basic)[^] Asynchronous Programming with Async and Await (C# and Visual Basic)[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
Thanks to all for your down Votes. It's seems that those who doesn't have the idea how to resolve the problem , attack the question. Sorry friend what do you want , to ask : " ... It's true that 1+1=2 ?" It's sure that for this question exist a solution ( even prior to .NET 4.5 ) ( for sure , it's not me that found the solution , because I don't pretend to be a high level professional ). But I will not post here the solution. Maybe some of those that have down voted , try to find the answer , because someone that pretend to have a professional level , should show this with an answer not with a down vote.
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Thanks to all for your down Votes. It's seems that those who doesn't have the idea how to resolve the problem , attack the question. Sorry friend what do you want , to ask : " ... It's true that 1+1=2 ?" It's sure that for this question exist a solution ( even prior to .NET 4.5 ) ( for sure , it's not me that found the solution , because I don't pretend to be a high level professional ). But I will not post here the solution. Maybe some of those that have down voted , try to find the answer , because someone that pretend to have a professional level , should show this with an answer not with a down vote.
Yeah, about the reputation...
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Dave Kreskowiak -
Thanks to all for your down Votes. It's seems that those who doesn't have the idea how to resolve the problem , attack the question. Sorry friend what do you want , to ask : " ... It's true that 1+1=2 ?" It's sure that for this question exist a solution ( even prior to .NET 4.5 ) ( for sure , it's not me that found the solution , because I don't pretend to be a high level professional ). But I will not post here the solution. Maybe some of those that have down voted , try to find the answer , because someone that pretend to have a professional level , should show this with an answer not with a down vote.
And why have you posted this abusive response to my message, when I've tried to help you? :mad: Your account is currently on 8 "abusive/troll" votes. Two more, and you'll be kicked off the site.
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
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And why have you posted this abusive response to my message, when I've tried to help you? :mad: Your account is currently on 8 "abusive/troll" votes. Two more, and you'll be kicked off the site.
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
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and what is the abusive part of my post ? If you are one of them that down voted , well , sometimes the truth is hard to accept.:confused:
I posted a genuine answer to your question. You replied with a message complaining about down-votes, and stating that you found an answer elsewhere, but you're not going to share it with us because none of us are "professional" enough. And you can't see the abusive part of that? :doh:
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
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and what is the abusive part of my post ? If you are one of them that down voted , well , sometimes the truth is hard to accept.:confused:
dilkonika wrote:
and what is the abusive part of my post ?
The part where you tell a professional that is trying to help you that he should not have posted an answer. It is saying you want explanation in words, not code - and demand code five minutes later.
dilkonika wrote:
sometimes the truth is hard to accept.:confused:
Yes, a recurring theme.
Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^][](X-Clacks-Overhead: GNU Terry Pratchett)
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I posted a genuine answer to your question. You replied with a message complaining about down-votes, and stating that you found an answer elsewhere, but you're not going to share it with us because none of us are "professional" enough. And you can't see the abusive part of that? :doh:
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
Maybe was a mistake from me that I posted my replies to your message. My replies was intend to be a general replies to all of those that have down voted. Because I think each down vote should have an argumentation. And I found the answer elsewhere ( it is not my solution ) , but I don't post here only for those that have down voted. ( if you are one of them , this is for you too). The reason is that I think that when someone doesn't know the solution , attack the question. For these people I thing that they aren't professional. Instead of simply down vote a question : 1) Find a solution 2) Ignore the question 3) Say " I'm sorry I don't know " 4) Down vote , but with arguments why this question has problems.
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Maybe was a mistake from me that I posted my replies to your message. My replies was intend to be a general replies to all of those that have down voted. Because I think each down vote should have an argumentation. And I found the answer elsewhere ( it is not my solution ) , but I don't post here only for those that have down voted. ( if you are one of them , this is for you too). The reason is that I think that when someone doesn't know the solution , attack the question. For these people I thing that they aren't professional. Instead of simply down vote a question : 1) Find a solution 2) Ignore the question 3) Say " I'm sorry I don't know " 4) Down vote , but with arguments why this question has problems.
dilkonika wrote:
My replies was intend to be a general replies to all of those that have down voted.
That'd be me.
dilkonika wrote:
And I found the answer elsewhere ( it is not my solution ) , but I don't post here only for those that have down voted.
Not a downvote, but an abuse-flagging. It is not something that is flagged on a question, but on an account. Read his post again.
dilkonika wrote:
The reason is that I think that when someone doesn't know the solution , attack the question.
More likely cause would be being rude against volunteers.
dilkonika wrote:
For these people I thing that they aren't professional.
This is spare time, you should not be expecting a business-treatment.
dilkonika wrote:
Instead of simply down vote a question :
Demands are hardly going to work. There's some basic rules for the forum as a sticky on top of each page. I think it is worded correctly. Instead of making demands, try kindness.
Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^][](X-Clacks-Overhead: GNU Terry Pratchett)
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dilkonika wrote:
and what is the abusive part of my post ?
The part where you tell a professional that is trying to help you that he should not have posted an answer. It is saying you want explanation in words, not code - and demand code five minutes later.
dilkonika wrote:
sometimes the truth is hard to accept.:confused:
Yes, a recurring theme.
Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^][](X-Clacks-Overhead: GNU Terry Pratchett)
Are you as well reminded of a certain member by a(nother?) member posting a couple of questions here recently?...
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Are you as well reminded of a certain member by a(nother?) member posting a couple of questions here recently?...
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
