Infragistics Tips and Tricks - Part 1 of N

The current project I'm on is using Infragistics controls exclusively.  Infragistics can do some wonderful things, but damn, sometimes it does it horribly.  So here are a couple little hints and tips that might save someone a couple of frustrating moments of despair.  Find something in my list that I did wrong?  Found something I could have done better / cleaner / quicker? Please let me know.

Binding to a List<>

If you are binding your Grid to a BindingSource that in turn is bound to a Generic List, the key of your band needs to be the name of the class your list contains.

List<Message> myList = new List<Message>();
myBindingSource.DataSource = myList;
myUltraGrid.DataSource = myBindingSource;

Band key in your schema is 'Message'.  If your class contains another collection there will be bands for those collections which will add 'plus' signs beside all your rows even if that collection is empty.  Create another band in your schema with a key equal to your child collection and then set Hidden = true.  (See below about the Hidden property...)

The other note for binding to a generic list is that if it isn't an ObservableCollection or BindingList  (or anything that doesn't implement IBindingList or IBindingListVIew) then you are not going to get an update when you add or remove and item from the list.  If you know these things are happening you can call myBindingsource.ResetBindings(false) when they happen to update your grid with the new bindings.

Good article on what interfaces have what binding functionality.

Can't Find the .Visible property?

This one baffles me, and I'd love to know why some infragistics controls do not have a .Visible property, instead they have a .Hidden.  Watch out for that.  Apparently this is some sort of VB throw back blah blah blah.

CreationFilter's To Change GroupBy Headers

CreationFilters are a really cool concept that let you change the layout of a lot of Infragistic controls and add new functionality.  I used this to add some status lights to the GroupByRows of my grid. 

Create a Creation Filter class that implements IUIElementCreationFilter.  My AfterCreateChildElements(UIElement parent) does nothing but here is my  BeforeCreateChildElements method.  This will create 3 icons and some text in the group by row.  I create my own text element but if you want to grab the existing text element: 

DependentTextUIElement dependentTextUIElement =
       parent.GetDescendant(typeof(DependentTextUIElement)) as DependentTextUIElement;

public bool BeforeCreateChildElements(UIElement parent)
{
    bool value = false;
    if (parent is GroupByRowDescriptionUIElement)
    {
        int X = 17;
        int Y = parent.Rect.Y + 1;
        int Width = 516;
        int Height = 17;
        UltraGridGroupByRow groupByRow = (UltraGridGroupByRow)parent.GetAncestor(typeof(GroupByRowUIElement)).GetContext(typeof(UltraGridGroupByRow));
        DeviceStatusInfo deviceInfo = groupByRow.Tag as DeviceStatusInfo;

        if (deviceInfo == null)
        {
            deviceInfo = new DeviceStatusInfo("", DeviceState.Offline, DeviceOnlineState.NotOnline, "", FoundationHelper.GetImage(typeof(string)));
            groupByRow.Tag = deviceInfo;
        }
        string text = deviceInfo.DeviceName;
        if (!string.IsNullOrEmpty(deviceInfo.DeviceCurrentOperationsText))
            text += " - " + deviceInfo.DeviceCurrentOperationsText;
        TextUIElement textElement;
        ImageUIElement firstIndicator;
        ImageUIElement secondIndicator;
        ImageUIElement deviceIcon;
        parent.ChildElements.Clear();
        deviceIcon = new ImageUIElement(parent, deviceInfo.DeviceImage);
        textElement = new TextUIElement(parent, text);
        firstIndicator = new ImageUIElement(parent, deviceInfo.DeviceStatusImage);
        secondIndicator = new ImageUIElement(parent, deviceInfo.DeviceOnlineImage);
        deviceIcon.Rect = new Rectangle(X, Y - 1, deviceInfo.DeviceImage.Width, deviceInfo.DeviceImage.Height);
        firstIndicator.Rect = new Rectangle(deviceIcon.Rect.X + deviceIcon.Rect.Width + 2, Y, deviceInfo.DeviceStatusImage.Width, deviceInfo.DeviceStatusImage.Height);
        secondIndicator.Rect = new Rectangle(firstIndicator.Rect.X + firstIndicator.Rect.Width + 2, Y, deviceInfo.DeviceOnlineImage.Width, deviceInfo.DeviceOnlineImage.Height);
        textElement.Rect = new Rectangle(secondIndicator.Rect.X + secondIndicator.Rect.Width + 2, Y, Width, Height);
        parent.ChildElements.Add(deviceIcon);
        parent.ChildElements.Add(textElement);
        parent.ChildElements.Add(firstIndicator);
        if (deviceInfo.DeviceStatus == DeviceState.Online)
        {
            parent.ChildElements.Add(secondIndicator);
        }
        firstIndicator.ToolTipItem = deviceInfo.GetDeviceStatusToolTip();
        secondIndicator.ToolTipItem = deviceInfo.GetDeviceOnlineStatusToolTip();


        value = true;
    }
    return value;
}

Set the creation filter:

this.ultraGrid.CreationFilter = new GroupRowIndicatorsCreationFilter();

TabClosing Event Order

This tip is kind of specific, but thought I'd post it here anyway.  If you are using the Mdi Tabbed Workspace (and I assume the Mdi Tab Control) then a little gotcha is that when the user closes a form, either by clicking the 'X' or by you firing the form.Close() method the Mdi_Tab_Closing method is fired BEFORE the Form_Closing event.  If you think about it, it makes sense, however it is a pain in the butt if you want to handle someone closing a tab, and someone closing the whole app differently.  In our app we have functionality similar to visual studio, if you caused it to fire?!? Short answer is you can't.  So here is a little method that will fire before either Mdi_Tab_Closing and Form_Closing.

protected override void DefWndProc(ref System.Windows.Forms.Message m)
{
      if (m.Msg == WM_SYSCOMMAND && m.WParam.ToInt32() == SC_CLOSE)
     {
          applicationClosing = true;
     }
     base.DefWndProc(ref m);
}

The applicationClosing bool allows me to check if the user hit the X button when I'm in my Mdi_Tab_Closing.  If you have an 'Exit' option from a file menu then in that code you will want to set applicationClosing = true in there as well.

Reset permissions for existing folders on a new Vista Install

I just did a fresh install of Vista Ultimate on my home desktop PC.  The install all went fairly smooth except for 2 things:

1) IIS was not installed, and I missed the little checkbox to install ASP support.

2) I had a lot of problems accessing my existing Documents And Settings folders and could not access (only read access) my other partitions.  Even as Administrator I could not seem to set permissions on these folders and drives so I could write to them.  Thankfully Tim Sneath came to the rescue with a posting about 'Deleting the Undeletable' in which he explains how to reset the permissions on files to give yourself access to them. 

it's not unusual to find some folders that can't be accessed, even by an administrator, because their ACLs were set for accounts with SIDs that applied to an old partition

Tim provides a quick batch command that will allow you to reset the proper permissions for the Administrators group. 

takeown /f %1 /r /d y
icacls %1 /grant administrators:F /t

Just pass it a directory to start at (it is recursive).

Big thanks to Tim.

IIS 7, ASP, and Vista

When I did a fresh install of Vista on my home desktop machine it did not install IIS by default which is to be expected.  But the real problems started when I could not find out how to install ASP support.  Anytime I would try and load an aspx file it would say it didn't know how to handle .aspx as a static file.  Very frustrating.

Barry Gervin provided a link that shows the step by step instructions on how to properly install IIS 7 on vista, including the slightly hidden ASP.NET support.  Is anyone really installing IIS7 and not installing ASP.NET support?

Vista DreamScene

While I was out at the Vista Ice House in Toronto last week they were demo'ing 'DreamScene', which is movies as desktop wallpapers.  The basic idea is that you take a small subtle looping video and apply it as your background.  Obviously this is eye candy only, but it is pretty impressive eye candy when done properly.  There is a video here that shows a couple of examples.

DreamScene is one of those annoying Ultimate Extras which must really drive anyone without Ultimate absolutely nuts.  Thankfully I have Ultimate, and managed to get my hands on a beta (the official release is apparently some vague time in the future), only problem is that the beta does not seem to support dual-monitors, something that hopefully will be addressed in time for the final release.  WinCustomize has started a page where you can get some DreamScene movies, apparently both in-house created, and user submitted.  It doesn't appear that the page is ready for primetime, but you can check it out none the less.

How Smart Are You?

Is Google Taking Over My Computer?

Clipboard Copying Problem

I recently ran into a problem with the clipboard that is apparently a fairly common problem without a common answer.
The problem occurs while making a temporary copy of the clipboard.

I needed to put something into the clipboard, but I didn't want the user to lose what they already had in there, the easy way that I assumed would work looked like this:

IDataObject oldClipboard = Clipboard.GetDataObject();

//random clipboard manipulation here

Clipboard.SetDataObject(oldClipboard,true);

The true ensures that the data is held in the clipboard even after the program closes.  This solution meets with a "The requested clipboard operation failed" message if there is ever anything actually in the clipboard originally.

So here is the proper way of making a copy of the clipboard data, assuming of course that you have no idea what is in the clipboard before you arrived.  An important note if you aren't aware of how the clipboard is structured.  When you copy text out a richtextbox it is actually stored in several different ways:
Rich Text Format
Rich Text Format Without Objects
RTF As Text
System.String
UnicodeText
Text

The solution:

IDataObject oldClipboard = Clipboard.GetDataObject();

DataObject newClipboard = new DataObject();

string[] s;

s = oldClipboard.GetFormats(); //gets all the possible formats for that data

foreach(string ns in s)

{

newClipboard.SetData(ns,oldClipboard.GetData(ns)); //re-associate the old data with the proper types

}

//this is where your clipboard manipulation goes.

Clipboard.SetDataObject(newClipboard,true); //true makes sure the data persists

 

 

Web MSN plus SP2 and BitTorrent

Well MSN has knocked one of its shortfalls of the list (it's pretty long).

I heard last week that Microsoft had openned up a web-based version of its popular MSN client, but everytime I tried it the site seemed to be down. However it seems to be up and pretty stable, and it's pretty nice too. Microsoft seems to be doing some pretty great things with WebGUI's, WebOutlook looks almost identical to normal Outlook, and now web MSN looks amazingly like MSN as well.

So everyone give it a try at http://webmessenger.msn.com/

Also a note on SP2, anyone installed it yet? I heard a lot of bad things during the beta stages, I assume that Microsoft fixed all these problems before they turned it Gold, but I'm still a little hesitant. IBM has apparently asked its users to hold off with the install. Apparently this is routine, but I now have a mounting list of 'apparents and hopes'. The list of improvements does sound nice though, maybe not for myself (but the new WiFi improvements should be interesting to see) but more for the family that I have become the unofficial tech-support for. There is a good article at NeoWin about the improvements and beefed up security.

My last note is that at http://sp2torrent.com/index.php you can get a Torrent for the new SP2 (which is a pretty big file). I'm glad to see that there are people trying to show a legal use for P2P before the US Government ups and makes it illegal. My car has illegal uses too, but I haven't heard of any bills before the US Congress to ban cars for any use...

Canada Lost The Stanley Cup?

Monad, it isn't just danom backwards anymore.

VS.NET Inherited Forms Bug