.NET Developments - A SearchWinDevelopment.com Blog

.NET Developments:

 

A SearchWinDevelopment.com Blog


A blog on all things .NET, with news and tips about Visual Studio, ASP.NET, Visual Basic programming, C# and .NET architecture.

Mono WinForms reaches finish line

The Mono team has been working on its version of Sytem.Windows.Forms for almost four years. And it has hit the finish line. There were 6,434 commits along the way. What’s next? Bug fixing! Twas ever thus!

Using Master Pages in Visual Studio 2008

The way you use Master pages has changed in Visual Studio 2008.  Remember, how in Visual Studio 2005 when you add a new Web Form in ASP.NET applications - you get to choose a master page to apply to the Web form.  If you choose to use a Master page - then the page that is added, when you check the HTML code for that page - it is stripped of all the standard HTML tags - only the Page directive and the <asp:Content> tags are available.  This is a Content page.

In Visual Studio there are two types of Web Forms available - Web Form and the Web Content Form

The Web Form is a standard Web Form - without the Master page, with its HTML code like a standard HTML page.  Whereas, the Web Content Form is the one to which you can attach a Master page.

The Web Form page also has a MasterPageFile property.  But, if you create a Web Form and then set the MasterPageFile property to link to your Master page you will get a run time error.

Content controls have to be top-level controls in a content page or a nested master page that references a master page.

This is because content pages must not have another other HTML tags or controls. 

If you want to use Master Pages use Web Content Form, otherwise use the Web Form.

Another nice feature in Visual Studio 2008 - is that in that in the top right corner of the Design window of the Web content page is a link to the Master page that this page is linked to.  Also, the “Split” view is cool.. you can now see the source and the design view tiled in the design area.

VB6 Programmers - What happened to Printer.Print?

This post goes out to all you VB geeks that are wondering what happened to Printer.Print in VB.  This may be a dated topic but I have a feeling there are a few out there longing for those VB6 days when the printer was always sitting there loyal and waiting.  The VB6 programmer’s best friend.  Well, when you needed to print something anyway.   Once upon a time you could just write a few lines of code and *poof* you created a page of information for your users.  Now you have this PrintDocument thing and PrintDialogs and PrintPreviewDialogs and Graphics objects and the list just goes on and on.

Let me re-introduce you to printing in .NET.  Once you get through the slight grade of the learning curve, you’ll be convinced that .Net printing is better than anything you did with the printer object in VB6.

The task - print a smiley face on a piece of paper.  Lines of code in VB6 - about 6.  Lines of code the .net way - about 22 (but you could consolidate…).

That doesn’t sound like a good trade off.  It seems its easier in VB6.  However - what if you wanted to create a bitmap of the smiley face and then use that bitmap in various places as well as print it here and there?  How many line of code do you need now?

 In VB6 - I have no idea.  You would need to drop down to the API level and call graphics functions against a Device Independent Bitmap device context making sure you clean up after yourself in those places where cleanup is necessary.  Then you would need to save that bitmap to a file and/or have an image control somewhere that you could set using the memory bitmap (again using API calls).  Then perhaps you could print the smiley here and there using some similar printing code.

In .NET - its the same 22 lines of code and you can run those lines of code against any “Device Context” (using API terminology) by simply passing a Graphics object to the code that actually creates the smiley.  You could even create a bitmap object and simply use that bitmap throughout your program without ever getting close to the windows API.
Here are my CreateSmiley functions:

private void DrawSmiley(Graphics g, int Width)
{
  Pen p=new Pen(Color.Black);
  SolidBrush b = new SolidBrush(Color.Black);
  SolidBrush YellowBrush = new SolidBrush(Color.Yellow);
  Point Origin = new Point(0, 0);
  Size HeadSize=new Size(Width,Width);
  Rectangle Container=new Rectangle(Origin, HeadSize);
  Point LeftEye=Origin;
  Point RightEye=Origin;
  Point SmileTopLeft = Origin;
  LeftEye.Offset((int)(HeadSize.Width*.25), (int)(HeadSize.Width*.20));
  RightEye.Offset((int)(HeadSize.Width*.65), (int)(HeadSize.Width*.20));
  SmileTopLeft.Offset((int)(HeadSize.Width *.20), (int)(HeadSize.Width * .40));
  Size SmileSize = new Size((int)(HeadSize.Width*.60), (int)(HeadSize.Width*.40));
  Size EyeSize=new Size((int)(HeadSize.Width * .10),(int)(HeadSize.Width * .10));
  g.FillEllipse(YellowBrush, Container);
  g.DrawEllipse(p, Container);
  g.FillEllipse(b, new Rectangle(LeftEye, EyeSize));
  g.FillEllipse(b, new Rectangle(RightEye, EyeSize));
  g.DrawArc(p, new Rectangle(SmileTopLeft, SmileSize), 180, -180);
  b.Dispose();
  YellowBrush.Dispose();
  p.Dispose();
}

private Bitmap CreateSmiley(int Width)
{
  Bitmap Smiley = new Bitmap(Width, Width);
  Graphics g=Graphics.FromImage(Smiley);
  DrawSmiley(g, Smiley.Width);
  g.Dispose();
  return Smiley;
}

Pretty basic stuff and different than you did in VB6. You have access to all the API stuff without dropping down the the API level. Now as far as printing goes - there are a few objects that need your attention. The PrintDocument, PrintDialog, and PrintPreviewDialog objects. The PrintDocument object is the container for all your drawing methods. It handles paging and rendering of the stuff you are printing. The PrintDialog and PrintPreviewDialog objects manage the actual device you are printing to. The PrintDialog as you may have guessed will print to a printer while the PrintPreviewDialog prints to a preview window.

Here is some code that uses a PrintPreviewDialog and calls the printing methods above:

private void button1_Click(object sender, EventArgs e)
{
  PrintDocument pdoc = new PrintDocument();
  // hook up the event handler for the printpage event
  pdoc.PrintPage += new PrintPageEventHandler(pdoc_PrintPage);
  PrintPreviewDialog pdialog = new PrintPreviewDialog();
  pdialog.Document = pdoc;
  pdialog.ClientSize = new Size(640, 480);
  pdialog.Show();
}
void pdoc_PrintPage(object sender, PrintPageEventArgs e)
{
  Bitmap smiley=CreateSmiley(300);
  e.Graphics.DrawImage(smiley, new Point(150, 150));
  e.HasMorePages = false;
}

The VB.Net code is virtually the same. Just change the declaration variables around, change the curly braces to Sub/End Sub, remove the semi-colons and your 80% done.
This method of printing is easy to hook up and offers a great deal of flexibility but if you want real reporting power - there is no substitute for a good reporting engine such as SQL Server Reporting Services or Business Objects’ Crystal Reports. There are others.  I’m a convert.  I was a Crystal Reports bigot but if you’re using a SQL Server database - you get reporting services for free and I must admit after running SQL RS through its paces - I like it better than Crystal Reports.  That, of course, is my opinion.

mysmiley

The elusive project properties

So I put together my setup project using the in-grown version of MSI (don’t get me started on how cumbersome it is to add files!) and then built it. Looked good.

But when I tested it, the suggested path was “C:\Program Files\Default Company Name”. Whaaa? Where was it getting that from? And how could I get it to show the correct name? I figured I needed to modify some properties somewhere.

I right-clicked on the project in Solution Explorer, and then chose Properties. That brought up the configuration properties, not the project properties. Next I clicked on Project | Properties. That brought up the configuration properties again. So did View | Property Pages.

Then light dawned on Marblehead, as they say in New England. In Solution Explorer, I clicked on the name of the project. Then I clicked View on the menu bar and found the entry for Properties Window and clicked that. There it was—the manufacturer was set to Default Company Name. (Maybe I should buy that domain name….) At least it was an easy fix, once I found the right place.

I also noticed that I could choose an icon for my app’s entry in the Add/Remove Programs applet, as well as pre- and post-build events. I got all excited for a minute, thinking these were pre- and post-install events, but no such luck. Now wouldn’t that be nice!

The Deployment Project Properties window (as it is officially called) is very much like the properties windows for controls such as listboxes and buttons. Controls are objects, and so are projects, so I suppose it makes sense that you’d get to their properties the same way.

But they could have told me.

They could have told me

(Editor’s note: This is the first blog post by Chris Madsen, who will be writing on the .NET Developments blog from time to time. Madsen is a consultant who programs in Visual Basic and Visual Studio 2005. Her first few posts will cover the ups and downs of migrating from VS 2003 to VS 2005; she’ll also write about some of the Visual Studio 2005 features that surprised her. Welcome aboard, Chris!)

The other day I got the latest edition of Visual Studio magazine in the mail. Along with it came a glossy, full-color pirate’s map. Evidently, that’s how Microsoft thinks of Visual Studio 2008 — “made for the likes of developers, and other scoundrels.”

I know the calendar says 2008, but in the real world of developers, it’s barely 2005. And I’m more a captain of a leaky little fishing boat than I am a pirate. It takes everything I have to get my work out the door on time. I upgrade my tools (such as Visual Studio) when I can’t live without a new feature, not when I get glossy maps in the mail.

I’m not alone: I still see plaintive questions begging for help with VB 6 apps, and with upgrading to VB .NET. I’ll leave it to others to reveal all the cool new stuff in VS 2008. I’m going to concentrate on Visual Studio 2005, including the woes of upgrading from VS 2003.

Whenever I run across a juicy bit, I’ll let you know. These are the things they never tell you, the information that’s written between the lines in the documentation, the stuff they leave out. It’s the stuff you find after opening a hundred Google links, buried in the answer to the answer to the answer to a question on some obscure site.

Who is this “they” who never tells me stuff? I’ll leave it up to you to decide.

I program mostly in Visual Basic .NET, so that’s what I’ll be talking about. I work almost exclusively with WinForms, and I’ve done a lot of work using Access, Word, and Excel in .NET apps. I love to write macros to make my life easier. I am a consultant with clients in Florida, Massachusetts and Maine. Just to keep things interesting, I live across country from all of them, in Washington State. So I might throw in some tidbits about telecommuting and consulting. Let me know if you are interested.

I’m sure I’ll write about some things you already know. Maybe they’ll make you smack your head and exclaim, “What sort of idiot is she?” But I figure if it wasn’t obvious to me, it wasn’t obvious to someone else, and that’s who the tidbit is for. I’m glad you have a better grasp of some things than I do.

But they could have told me.