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  • Best practice to avoid InvalidOperationException: Collection was modified?

    - by Roflcoptr
    Very often I need something like that: foreach (Line line in lines) { if (line.FullfilsCertainConditions()) { lines.Remove(line) } } This does not work, because I always get a InvalidOperationException because the Enumerator was changed during the loop. So I changed all my loops of this kind to the following: List<Line> remove = new List<Line>(); foreach (Line line in lines) { if (line.FullfilsCertainConditions()) { remove.Add(line) } } foreach (Line line in remove) { { lines.Remove(line); } I'm not sure if this is really the best way since in the worst case I have to iterate 2 times over the original list and so it needs time 2n instead of n. Is there a better way to do this?

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  • Fastest way to copy a set (100+) of related SQLAlchemy objects and change attribute on each one

    - by rebus
    I am developing an app that keeps track of items going in and out of factory. For example, lets say you have 3 kinds of plastic coming in, they are mixed in various ratios and then sent out as a new product. So to keep track of this I've created following database structure: This is very simplified overview of my SQLAlchemy models: IN <- RATIO <- OUT <- REPORT ITEMS -> REPORT IN are products coming in, RATIO is various information on measurements, and OUT is a final product. REPORT is basically a header model which has a lot of REPORT ITEMS attached to it, which in turn relate it to OUT products. This would all work perfectly, but IN and RATION values can change. These changes ultimately change the OUT product which would mean the REPORT values would change. So in order to change an attribute on IN object for example I should copy that object with that attribute changed. I would think this is basically a question about database normalization, because i didn't want to duplicate all the IN, RATIO and OUT information by writing it in REPORT ITEMS table for example, but I've came across this problem (well not really a problem but rather a feature I'd like for a user to have). When the attribute on IN object is changed I want related objects (RATIO and OUT) automatically copied and related to a new IN object. So I was thinking something like: Take an existing instance of model IN that needs to change (call it old_in) Create a new one out of it with some attributes changed (call it new_in) Collect all the RATIO objects that are related to old_in Copy each RATIO and relate them to a new_in Collect all the OUT objects that are related to old RATIO Copy each OUT and relate them to a new RATIO Few questions pop to mind when i look at this problem: Should i just duplicate the data, does all this copying even make sense? If it does, should i rather do it in plain SQL? If no what would be the best approach to do it with Python and SQLAlchemy? Any general answer would suffice really, at least a pointer in right direction. I really want to free then end user for hassle of having create new ratios and out products.

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  • Class Members Over Exports

    - by VirusEcks
    When Using DLLs or Code-injecting to be Specific this is an example class only intended for explaining class test { int newint1; char newchararray[512]; void (*newfunction1)( int newarg1 ); int newfunction2( bool newarg1, char newarg2 ) { return newint1; } } mynewclass1; that covers most common elements that's included in classes now when exporting this function to another DLL or application and missed an element of those, either data member or function member, private or public what happens or changed their order ? and if each function is assigned it's value when Code-Injecting like mynewclass1.newfunction1 = (void *)(newexportedfunction); what's the happens in this case, if members of the class are pointers that are assigned after class construction and then missed one member or changed their order ?

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  • Visual Studio 2010 deploys views too late in deploy process

    - by Markus
    I have a database project in my VS2010 solution. I recently changed a view and and changed a number of functions to use this view instead of going directly against a table. But now when I deploy I get errors on most of these functions because the column asked for does not exists in the view yet. The update of the view happends later than the update of UDF's. Is there any way to change this behaviour? Wouldn't the best thing be if the deploy script updated in this order: tables, views, SP and UDF. It seems like tables is updated first, but the views are just thrown in somewhere in the middle of the deploy script.

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  • Android: How can we change the view in the tabs?

    - by achie
    I want to provide a clickthrough on the list in a tab which opens another view. I need to open the new view within the same tab. I then need to provide a back button on the changed layout to change the view to original view. I have tried this. Intent intentA = new Intent(this, AView.class); Now I am trying to access the tabSpec from main activity class[MainTabView] and set the intent as follows. MainTabView.tabSpec1.setContent(intentA); MainTabView.mTabHost.setCurrentTab(0); MainTabView.mTabHost.invalidate(); But this does not change the view immediately but changes it when I go to another tab and come to the starting tab. How can I make it to refresh it as soon as the content has been changed to another intent?

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  • SVN : how to change hostname?

    - by elon
    I'd like to sep up SVN repo on local machine. But we already have apache running under localhost. When I use instalator form subversion site with apache option it installs another apache and when I type "localhost" in browser I see this new apache (not the old one). Question is how to run this new apache under other host name. When installing it asks about it, so I set different name, but it still works under localhost (nothing happens). I'd like to have access to svn via URL e.g. "svnrepo" not "localhost". What can I do about it? Which lines of config should be changed (and/or what's more should be changed?) Another way I'm thinking of to solve this problem is to integrate this svn-apache module with mine apache. But still I don't really know how to do it (my apache is 2.2.6)

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  • When to save a variable in viewstate?

    - by Umut
    Hi, I have searched the web for the answer and saw that mostly variables are saved in viewstate on page.prerender event. However, when I save a variable in viewstate on prerender or load events, how can it store the changed value of the variable? Let's say, after page load, user clicked a button and the value of the variable was changed in onClick event of the button. Then the postback event raised since the button was clicked. According to me, the new value should have been lost and cannot be saved in the viewstate if I save the variable in the viewstate only in prerender event. Shouldn't I save the variable in the viewstate just before the postback event rises? Am I wrong? If so, how can viewstate store the new value of the variable? Thanks for the answer in advance..

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  • Is System.Windows.Media.RenderCapability the wrong source to detect the current render-mode

    - by happyclicker
    I use System.Windows.Media.RenderCapability.Tier to show the current render mode within a diagnostics panel of my app. If I force the app to change the render-mode through the following code HwndSource hwndSource = PresentationSource.FromVisual(visual) as System.Windows.Interop.HwndSource; HwndTarget hwndTarget = hwndSource.CompositionTarget; hwndTarget.RenderMode = renderMode; neither System.Windows.Media.RenderCapability.TierChanged fires, nor has the System.Windows.Media.RenderCapability.Tier property changed. However the changes are applied to the app. If I look with Perforator, the render mode has been changed to the desired mode. Although I’ve found at many locations that System.Windows.Media.RenderCapability.Tier can be used to detect the current render state (also msdn, see this), it seems, System.Windows.Media.RenderCapability only gives information about the capabilities and not about the current mode. That makes also sense if I look at the name of the class. Is there another source to know how an actual wpf-content is rendered or am I doing something wrong?

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  • Controlling Too Many listboxes ( C#)

    - by Ases
    I have almost 200 listboxes. I'm changing their visibility according to my variables from database. So I thought that, I prepared a arraylist. like this ListBox[] lbs = this.Controls.OfType<ListBox>().ToArray(); And used like this. for (int idx = 0; idx < Convert.ToInt32(ds.Tables[j].Rows[i][2])*12; idx++) lbs[idx].Visible = true; This codes are written to comboboxchange. Now everything is okay. But; example; first time I changed combobox 1-20 listboxes visible=true I changed combobox again not 1-20. 20,40 changing :S How can it be, can u tell me an alternative array list type, or another way?

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  • ActiveRecord bug? Or am I getting it wrong? (validates_presence_of if)

    - by Dmitriy Likhten
    Ok: User attr_accessible :name, :email, :email_confirmation validates_presence_of :email_confirmation if :email_changed? What happens in the following situation: u = User.find 1 u.name = 'Fonzi' u.name_changed? # => true u.email_changed? # => false u.valid? # => false : email_confirmation is required Basically, if I change if to unless the validates works as expected, won't validate if the email has not changed, will validate if the email changed. I thought the IF indicates "run this validation if the following function returns true. Seems to work backwards!? Am I just getting it wrong?

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  • Where happens merging in SVN - on the client or server?

    - by Malcolm Frexner
    At my company we evaluate working with feature branches. We want to use mergeinfo to track merging. I have issues in some of our tested projects where merging a trunk that has only little changes into branch leads to lots of changed files because of the changed mergeinfo. I read that this behaviour improoved between version 1.5 and 1.6. Does this mean if I update the SVN - server from 1.5.6 to 1.6 I can expext some improvements when merging, or does this depend on the client (which is 1.6.11)?

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  • Datagridview retains waitcursor when updated from thread

    - by Apeksha
    I have a DataGridView control in my Windows Forms Application. I am adding rows to the grid using a background thread. I change the form's cursor to Waitcursor when the process starts and back to Default when it ends. This works well for the form, but not for the grid. When the form's cursor is changed back to default, the grid's cursor does not change, although the cursor over the rest of the form does. Does this have anything to do with the fact that I am updating the grid from a background thread? (The cursor is being changed from the UI thread).

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  • Using modified date of file for comparison. Is it safe?

    - by papadi
    I want to make a procedure that does one way syncrhonization of a folder between a server and a client. I was thinking to use ModifiedDate as a criterio, provided that only the date of the server files will be used. Procedure will not use Modified dates of files on the client at all. It will read dates from the server and compare them with dates read from the server last time the procedure run. Do you think this is safe? Is there any possibility that Modified Date will not be changed when a file is edited or it will be changed without touching the contents of the file (eg. from some strange antivirus programs)?

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  • What's the best way to store custom objects in relational database?

    - by user342610
    I have my objects with their properties. Objects could change their structure: properties may be added/removed/changed. Objects could be absolutely dropped. So object's metadata (description, classes, call them like you want :) )could be changed. The database should store objects schemas and instances of these objects. What's the best way to organise a relational database structure to store data mentioned above? Currently I see only two ways: 1) Store objects schemas in a few tables: schema general data,schema properties, possible properties types. Store instances in their tables: instance general data, a few tables - per each type from possible properties types table to store instance properties data. And so on. 2) store objects schemas like in p1 but store instances like XML files in one table: one table for general instance info and one table with instance XML. please, don't ask why/for what I need this. Just need to store custom objects and DB should work fast :)

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  • How to get notified of modification in the memory in Linux

    - by Song Yuan
    In a userspace program in Linux, I get a piece of memory via allocation from the heap, then the pointer is distributed to a lot of other components running in other threads to use. I would like to get notified when the said piece of memory is modified. I can of course develop a custom userspace solution for other components to use when they try to modify the memory. The problem in my case is that these are legacy components and they can write to memory in many occasions. So I'm wondering whether there is a similar API like inotify (get notified when file is changed) or other approaches in order to get notified when a piece of memory is changed. I considered using mmap and inotify, which obviously won't work if the changes are not flushed. Any suggestions are appreciated :-)

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  • using i18n characters in url of image tag does not display the image

    - by user363171
    I am using the image tag as the path /data/image/image.txt does exists. and it displays the image also. but when i introduce some i18n characters in the path lets say it says 404 error image not found, but the path /data/image??/image.txt does exists, please help me to find the solution for this? I used the firebug also to see whether the characters are decoded properly or not, in firebug I am able to see the correct characters they are not changed, still it is not able to pick the image. thanks a lot in advance. Note: I am using tag because it was not allowing me to write the img tab in the post, and i have changed the jif ext to txt. please consider this.

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  • setfsuid() and python 2.5.4

    - by user331398
    Hi, I'm trying to use setfsuid() with python 2.5.4 and RHEL 5.4. Since it's not included in the os module, I wrapped it in a C module of my own and installed it as a python extension module using distutils. However when I try to use it I don't get the expected result. setfsuid() returns value indicating success (changing from a superuser), but I can't access files to which only the newly set user should have user access (using open()), indicating that fsuid was not truely changed. I tried to verify setfsuid() worked, by running it consecutively twice with the same user input The result was as if nothing had changed, and on every call the returned value was of old user id different from the new one. I also called getpid() from the module, and from the python script, both returned the same id. so this is not the problem. Just in case it's significant, I should note that I'm doing all of this from within an Apache daemon process (WSGI). Anyone can provide an explanation to that? Thank you

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  • Comparing large strings in JavaScript with a hash

    - by user4815162342
    I have a form with a textarea that can contain large amounts of content (say, articles for a blog) edited using one of a number of third party rich text editors. I'm trying to implement something like an autosave feature, which should submit the content through ajax if it's changed. However, I have to work around the fact that some of the editors I have as options don't support an "isdirty" flag, or an "onchange" event which I can use to see if the content has changed since the last save. So, as a workaround, what I'd like to do is keep a copy of the content in a variable (let's call it lastSaveContent), as of the last save, and compare it with the current text when the "autosave" function fires (on a timer) to see if it's different. However, I'm worried about how much memory that could take up with very large documents. Would it be more efficient to store some sort of hash in the lastSaveContent variable, instead of the entire string, and then compare the hash values? If so, can you recommend a good javascript library/jquery plugin that implements an appropriate hash for this requirement?

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  • capture the last WM_SIZE

    - by Michael
    When I resize my window I want to tell another part of my program that my window has changed size. I read on MSDN that: WM SIZE Message The WM SIZE message is sent to a window after its size has changed. However, I receive the WM_SIZE even when dragging. I noticed that there is also a WM_SIZING message that is sent when my window is resizing. At the moment I do not see the difference between WM_SIZE and WM_SIZING. Is there some way I can capture the very last WM_SIZE message, as to not "spam" my program with resize messages?

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  • ASP.Net aspx markup

    - by Batuta
    I am working on some old web forms application. When I changed from design to view source of the aspx page, the aspx markup becomes disarranged. For example, a label is written as follows: <asp:label id="Label20" style="Z-INDEX: 119; LEFT: 16px; POSITION: absolute; TOP: 424px" runat="server" Height="24px" Width="72px">Instructions:</asp:label> It suddenly becomes like this (when I toggle from design to source) <asp:label id="Label20" style="Z-INDEX: 119; LEFT: 16px; POSITION: absolute; TOP: 424px" runat="server" Height="24px" Width="72px">Instructions:</asp:label> Notice that the alignment and margins, tab stops are changed. Any idea how to prevent VS from doing this? Thanks.

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