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  • How have you successfully implemented MessageBox.Show() functionality in MVVM?

    - by Edward Tanguay
    I've got a WPF application which calls MessageBox.Show() way back in the ViewModel (to check if the user really wants to delete). This actually works, but goes against the grain of MVVM since the ViewModel should not explicitly determine what happens on the View. So now I am thinking how can I best implement the MessageBox.Show() functionality in my MVVM application, options: I could have a message with the text "Are you sure...?" along with two buttons Yes and No all in a Border in my XAML, and create a trigger on the template so that it is collapsed/visible based on a ViewModelProperty called AreYourSureDialogueBoxIsVisible, and then when I need this dialogue box, assign AreYourSureDialogueBoxIsVisible to "true", and also handle the two buttons via DelegateCommand back in my ViewModel. I could also somehow try to handle this with triggers in XAML so that the Delete button actually just makes some Border element appear with the message and buttons in it, and the Yes button did the actually deleting. Both solutions seem to be too complex for what used to be a couple lines of code with MessageBox.Show(). In what ways have you successfully implemented Dialogue Boxes in your MVVM applications?

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  • Looking for a simple interface for users to enter data for Silverlight application

    - by Edward Tanguay
    I have made a Silverlight application which can read data from various URLs. So users of the application who control a website can: FTP text and XML files onto their website put a clientaccesspolicy.xml in their root directory enter their URL in the silverlight application at which point the silverlight application then begins reading data from their site. I would like to extend this to less technical users who do not control a website, aren't adept with FTP, etc. What is the best service on the web that: allows users to publish different kinds of data, e.g. put out text files on web allows Silverlight client access (has clientaccesspolicy.xml set up) Some ideas are: free blog services (although then they are limited to a RSS feed, or the silverlight app would have to do some screen scraping) Google Docs? free cloud services? What free services allow easy publishing of any kind of data on the web and allow Silverlight client access?

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  • What is the best way to set up a PHP development environment on a Mac?

    - by Edward Tanguay
    When I do PHP, I use XAMPP to set up a development environment on Windows, then upload to Linux servers, works very well. I'm now passing on a PHP project to a person who has a Mac so he needs a local PHP dev environment. I noticed XAMPP has a version for Mac which I will recommend. But knowing that Mac is always a bit different, has anyone used any other easy PHP environment setup tool for the Mac, or I could even imagine that Mac solves this issue more elegantly by e.g. having a web server ready to go upon first boot etc. What is the best way to set up a PHP development environment on a Mac?

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  • How can a silverlight app download and play an mp3 file from a URL?

    - by Edward Tanguay
    I have a small Silverlight app which downloads all of the images and text it needs from a URL, like this: if (dataItem.Kind == DataItemKind.BitmapImage) { WebClient webClientBitmapImageLoader = new WebClient(); webClientBitmapImageLoader.OpenReadCompleted += new OpenReadCompletedEventHandler(webClientBitmapImageLoader_OpenReadCompleted); webClientBitmapImageLoader.OpenReadAsync(new Uri(dataItem.SourceUri, UriKind.Absolute), dataItem); } else if (dataItem.Kind == DataItemKind.TextFile) { WebClient webClientTextFileLoader = new WebClient(); webClientTextFileLoader.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClientTextFileLoader_DownloadStringCompleted); webClientTextFileLoader.DownloadStringAsync(new Uri(dataItem.SourceUri, UriKind.Absolute), dataItem); } and: void webClientBitmapImageLoader_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) { BitmapImage bitmapImage = new BitmapImage(); bitmapImage.SetSource(e.Result); DataItem dataItem = e.UserState as DataItem; CompleteItemLoadedProcess(dataItem, bitmapImage); } void webClientTextFileLoader_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) { DataItem dataItem = e.UserState as DataItem; string textFileContent = e.Result.ForceWindowLineBreaks(); CompleteItemLoadedProcess(dataItem, textFileContent); } Each of the images and text files are then put in a dictionary so that the application has access to them at any time. This works well. Now I want to do the same with mp3 files, but all information I find on the web about playing mp3 files in Silverlight shows how to embed them in the .xap file, which I don't want to do since I wouldn't be able to download them dynamically as I do above. How can I download and play mp3 files in Silverlight like I download and show images and text?

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  • How can I manage SQL CE databases in SQL Server Management Studio?

    - by Edward Tanguay
    I created a SDF (SQL CE) database with Visual Studio 2008 (Add / New Item / Local Database). Is it possible to edit this database with SQL Server Management Studio? I tried to attach it but it only offered .mdf and attaching a .sdf file results in "failed to retrieve data for this request". If so, is it possible to create SDF files with Management Studio as well? Or are we stuck with the simple interface of the Visual Studio 2008 database manager?

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  • Did iPhone Simulator 3.0 break two-finger div scrolling?

    - by Edward
    I recently upgraded to iPhone Simulator 3.0, and when I do a two-finger scroll on a div (in Safari or UIWebView), it no longer works. To do a two-finger scroll in iPhone simulator, hold option to get two fingers, hold shift to lock the fingers in place relative to eachother, and then click and drag the div. You can try scrolling the example div on this page: http://www.domedia.org/oveklykken/css-div-scroll.php Can anyone reproduce this?

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  • After playing a MediaElement, how can I play it again?

    - by Edward Tanguay
    I have a variable MediaElement variable named TestAudio in my Silverlight app. When I click the button, it plays the audio correctly. But when I click the button again, it does not play the audio. How can I make the MediaElement play a second time? None of the tries below to put position back to 0 worked: private void Button_Click_PlayTest(object sender, RoutedEventArgs e) { //TestAudio.Position = new TimeSpan(0, 0, 0); //TestAudio.Position = TestAudio.Position.Add(new TimeSpan(0, 0, 0)); //TestAudio.Position = new TimeSpan(0, 0, 0, 0, 0); //TestAudio.Position = TimeSpan.Zero; TestAudio.Play(); }

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  • Why would javascript click-areas not be working in IE8?

    - by Edward Tanguay
    I'm trying to find a bug in an old ASP.NET application which causes IE8 to not be able to click on the following "button" area in our application: <td width="150px" class="ctl00_CP1_UiCommandManager1i toolBarItem" valign="middle" onmouseout="onMouseOverCommand(this,1,'ctl00_CP1_UiCommandManager1',0,0);" onmouseover="onMouseOverCommand(this,0,'ctl00_CP1_UiCommandManager1',0,0);" onmousedown="onMouseDownCommand(this, 'ctl00_CP1_UiCommandManager1', 0, 0);" onmouseup="onMouseUpCommand(this, 'ctl00_CP1_UiCommandManager1', 0, 0);" id="ctl00_CP1_UiCommandManager1_0_0"> <span style="width:100%;overflow:hidden;text-overflow:ellipsis;vertical-align:middle;white-space:nowrap;"> NEW </span> </td> When we switch IE8 to IE7 compatibility mode, the problem disappears, IE7 is able to click on it. Since the above HTML is generated by a third party control (Janus, http://www.janusys.com/controls), we don't have the source code. has anyone experienced any similar problems with IE8? I've determined that it actually fires the onMouseDownCommand command also the CSS of the button area is different in IE8, it doesn't have color shading that it does in IE7. I can imagine that somewhere the HTML is not valid and IE8 being stricter is not playing along, but where? any advice on how to narrow in on this bug welcome ANSWER: Turned out to be that the application was not checking the navigator.agent for "MSIE 8.0" and was thus treating IE8 has a non-Internet-Explorer browser. Thanks Lazarus for the tip, the IE8 Javascript debugger is very nice, like a Firebug for IE, will be using it more!

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  • How significant is .NET 3.5 SP1 for WCF/REST?

    - by Edward Tanguay
    I just worked through a book on WCF and was surprised that it didn't even mention REST at all. Was REST an afterthought for WCF that was added in .NET 3.5 SP1 and hence not baked in well or is it well integrated? I assume that Silverlight and XBAPs can consume WCF with no problem or do they have some limitation due to their sandbox environments? I've been reading that some people are having problems getting WCF to play well with XBAP and I would assume there are similar problems with Silverlight.

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  • What would cause my Silverlight .xap to quadruple in size suddenly?

    - by Edward Tanguay
    I've been working on a Silverlight application. I just noticed that the .xap file is now four times as big as it was, what could have caused that? Here's some other info: there seems to now be many more language settings in the bin/Release directory I checked "Reduce size of .xap" in under Properties/Silverlight but that just brought it down from 1300 to 1200. I reference the System.Windows.Controls.Toolkit dll but I was doing that even when it was 325K Screenshot of build directories before and after:

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  • How can I determine in silverlight code where the silverlight instance is running?

    - by Edward Tanguay
    I have a silverlight app. When I develop I have it pick up its data from a local URL: http://localhost/theapp/data/... however, when it is online, I want it to pick up its data from an online URL: http://www.tanguay.info/... Currently I have a variable which I switch before I compile and upload: bool silverlightAppIsLive = true; which I use to determine whether or not to get data from the first or second URL above. Is there a way for me to determine this automatically in code without setting the variable manually?

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  • How can I get make JavaScript code execution to wait until an AJAX request with script is loaded and executed?

    - by Edward Tanguay
    In my application, I am using Ext.Ajax.request to load scripts which I execute with eval. The problem is that since it takes time for the AJAX request to complete, code that is executed afterward which needs variables which are in the script loaded in via AJAX. In this example, I show how this is the case. How can I change this code so that the execution of the JavaScript after the AJAX waits until the script in the AJAX call has been loaded and executed? testEvalIssue_script.htm: <script type="text/javascript"> console.log('2. inside the ajax-loaded script'); </script> main.htm: <html> <head> <script type="text/javascript" src="ext/adapter/ext/ext-base.js"></script> <script type="text/javascript" src="ext/ext-all-debug.js"></script> <script type="text/javascript"> function loadViewViaAjax(url) { Ext.Ajax.request({ url: url, success: function(objServerResponse) { var responseText = objServerResponse.responseText; var scripts, scriptsFinder=/<script[^>]*>([\s\S]+)<\/script>/gi; while(scripts=scriptsFinder.exec(responseText)) { eval.call(window,scripts[1]); } } }); } console.log('1. before loading ajax script'); loadViewViaAjax('testEvalIssue_script.htm'); console.log('3. after loading ajax script'); </script> </head> <body> </body> </html> output: 1. before loading ajax script 3. after loading ajax script 2. inside the ajax-loaded script How can I get the output to be in the correct order, like this: 1. before loading ajax script 2. inside the ajax-loaded script 3. after loading ajax script

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  • How reliable is DateTime.Utc in Silverlight applications?

    - by Edward Tanguay
    I have a silverlight application which users will be running in various time zones. The applications load their data from the server at one time, then cache it in IsolatedStorage. When I make changes to the data on the server, I want to be able to change the "last updated time" so that all applications download the newest data the next time they check this date. However, I'm a bit confused as to how to handle the time zone issue since a if the server is in New York and the update time is set to 2010-01-01 17:00:00 and a client in Seattle checks compares it to its local time of 2010-01-01 14:00:00 it won't update and will continue to provide old data for three more hours. My solution is to always post the update time in UTC time, not with the time on the server, then make the Silverlight app check with DateTime.UtcNow. Is this as easy as it sounds or are their issues with this, e.g. that timezones are not set correctly on computers and hence the SilverlightApp does not report the correct UTC time. Can anyone say from experience how likely it is that using DateTime.UtcNow like this for cache refreshing will work in all cases? If DateTime.UtcNow is not reliable, I will just use an incremented "DataVersion" integer but there are other scenarios in which getting time zone sychronization down would make it useful thoroughly understand how to solve this in silverlight apps.

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  • How to get Firebug to tell me what error jquery's .load() is returning?

    - by Edward Tanguay
    I'm trying to find out what data/error jquery's .load() method is returning in the following code (the #content element is blank so I assume there is some kind of error). Where do I find in Firebug what content or error .load() is returning? How can I use console.log to find out at least what content is being returned? <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script type="text/javascript" src="http://www.google.com/jsapi"></script> <script type="text/javascript"> google.load("jquery", "1.3.2"); google.setOnLoadCallback(function() { $('#loadButton').click(loadDataFromExernalWebsite); }); function loadDataFromExernalWebsite() { console.log("test"); $('#content').load('http://www.tanguay.info/web/getdata/index.php?url=http://www.tanguay.info/knowsite/data.txt', function() { alert('Load was performed.'); }); } </script> </head> <body> <p>Click the button to load content:</p> <p id="content"></p> <input id="loadButton" type="button" value="load content"/> </body> </html>

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  • VSTS Test Edition or HP's LoadRunner?

    - by Edward Leno
    I have had this debate with some peers off and on for a while. I am certified in the HP tools, but have been spending more and more time with VSTS Test Edition 2008. I am looking for opinions on what people think of the future of both products and how they compete. LoadRunner's strengths include its vast array of protocols supported. Unfortunately since HP took over from Mercury, they are beginning to lag behind, especially in the new internet spaces. VSTS Test, once very limited, is now quite impressive, especially in 2010. I don't know if it makes business sense, but I would love for VSTS Test to take on some additional protocols. Many of my clients would like to move away from HP and their licensing costs. Finally, I am looking for good resources for VSTS Test. I have been playing with it, but would like to see some dedicated courses/material, instead of just a part of the larger VSTS. Thanks!

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  • Why are events and commands in MVVM so unsupported by WPF / Visual Studio?

    - by Edward Tanguay
    When creating an WPF application with the MVVM pattern, it seems I have to gather the necessary tools myself to even begin the most rudimentary event handling, e.g. AttachedBehaviors I get from here DelegateCommands I get from here Now I'm looking for some way to handle the ItemSelected event in a ComboBox and am getting suggestions of tricks and workarounds to do this (using a XAML trigger or have other elements bound to the selected item, etc.). Ok, I can go down this road, but it seems to be reinventing the wheel. It would be nice to just have an ItemSelected command that I can handle in my ViewModel. Am I missing some set of standard tools or is everyone doing MVVM with WPF basically building and putting together their own collection of tools just so they can do the simplest plumbing tasks with events and commands, things that take only a couple lines in code-behind with a Click="eventHandler"?

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  • How reliable is DateTime.UtcNow in Silverlight applications?

    - by Edward Tanguay
    I have a silverlight application which users will be running in various time zones. These applications load their data from the server upon start up, then cache it in IsolatedStorage. When I make changes to the data on the server, I want to be able to change the "last updated time" so that all silverlight clients download the newest data the next time they check this date. However, I'm a bit confused as to how to handle the time zone issue since a if the server is in New York and the update time is set to 2010-01-01 17:00:00 and a client in Seattle checks compares it to its local time of 2010-01-01 14:00:00 it won't update and will continue to provide old data for three more hours. My solution is to always post the update time in UTC time, not with the time on the server, then make the Silverlight app check with DateTime.UtcNow. Is this as easy as it sounds or are their issues with this, e.g. that timezones are not set correctly on computers and hence the SilverlightApp does not report the correct UTC time. Can anyone say from experience how likely it is that using DateTime.UtcNow like this for cache refreshing will work in all cases? If DateTime.UtcNow is not reliable, I will just use an incremented "DataVersion" integer but there are other scenarios in which getting time zone sychronization down would make it useful to thoroughly understand how to solve this in silverlight apps.

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  • How to go to the next level integrating animations in WPF applications with Blend / VS2008?

    - by Edward Tanguay
    I have been able to create little animations with the storyline in Blend. And I have been able to copy in the isolated storylines and triggers into existing projects in visual studio to spruce them up on the edges a little bit. But after adding too many animations, they start to conflict or cancel each other out, etc., or I can make a panel slide down and slide it back up, then it no longer can slide down since it is not in its original state anymore. Does anyone have any links, video tutorials, books, resources which not only show you how to make a little animation and then leave you to figure out how to integrate numerous animations into a typical business application layout, but instead take you through the whole process of building a business application while integrating animations and WPF goodness with Blend and Visual Studio?

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