Initializing arrays in VS .NET

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Listing 1513 Initializing arrays
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textArray = new String[5] { "Black Item", "Blue Item", "Red Item", "Green Item", "Yellow Item", }; colorArray = new Color[5] { ColorBlack, ColorBlue, ColorRed, ColorGreen, ColorYellow, }; backColorArray = new Color[5] { ColorGray, ColorLightCyan, ColorLightPink, ColorYellow, ColorBlack, }; sizeArray = new int[5] { 12, 14, 16, 18, 20 }; // Bind text array to list box listBox1DataSource = textArray; The final step is to write DrawItem and MeasureItem event handlers The code for these handlers is given inListing 1514 We draw a focus rectangle and background of items, and then we draw text using DrawString by passing the color, text, and size after reading from arrays The MeasureItem event handler sets the height of the ListBox control items
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See s 3 and 5 for more about the DrawString method
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Listing 1514 The DrawItem and MeasureItem event handlers
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private void ListBoxDrawItem(object sender, DrawItemEventArgs e) { eDrawFocusRectangle(); eDrawBackground(); // Uncomment this code to set the background // color of items /* eGraphicsFillRectangle( new SolidBrush(backColorArray[eIndex]), new Rectangle (eBoundsLeft, eBoundsTop, eBoundsRight, eBoundsBottom) ); */ eGraphicsDrawString(textArray[eIndex], new Font(FontFamilyGenericSansSerif, sizeArray[eIndex], FontStyleBold), new SolidBrush(colorArray[eIndex]), eBounds); } private void ListBoxMeasureItem(object sender, MeasureItemEventArgs e) { eItemHeight= 24; } If we run the application, the output will look like Figure 1510
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Figure 1510 An owner-drawn ListBox control
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1554 An Owner-Drawn Image ListBox Control
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Sometimes we want to display images in a ListBox control By applying the method described in the preceding section, we can easily create an owner-drawn ListBox control with images in it In the previous example we created an array of strings and used DrawString to draw them This time we create an array of Image objects and call the DrawImage method First we define an array ofImage objects as follows:
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private Image [] imgArray = null; Then we initialize the image array We can create an Image object from a file by using theImageFromFile method The following code snippet initializes the image array:
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imgArray = new Image[5] { ImageFromFile("Img1jpg"), ImageFromFile("Img2jpg"), ImageFromFile("Img3jpg"), ImageFromFile("Img4jpg"), ImageFromFile("Img5jpg") }; Next we calculate the sizes of the images and draw them using DrawImage on the DrawItem event handler We can also set the sizes of items on the MeasureItem event handler Listing 1515 shows how to draw images using the DrawImage method
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Listing 1515 DrawItem and MeasureItem event handlers for an image ListBox control
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private void ListBoxDrawItem(object sender, DrawItemEventArgs e) { SizeF curImgSize = imgArray[eIndex]PhysicalDimension; eGraphicsDrawImage(imgArray[eIndex], eBoundsX+5 , ( eBoundsBottom + eBoundsTop ) /2 - curImgSizeHeight/2); } private void ListBoxMeasureItem(object sender, MeasureItemEventArgs e) { eItemHeight= 150; }
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The image listbox application looks like Figure 1511
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Figure 1511 An owner-drawn ListBox control with images
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More on Owner-Drawn Controls
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Now that you have an idea how the owner drawing process works, you can create owner-drawn menus, combo boxes, and other controls I recommend that you go to C# Corner and look at the Windows Forms section (http://wwwc-sharpcornercom/WinFormsasp) There you will find hundreds of useful source code samples available for download
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SUMMARY
GDI+ can be used to write fun applications In this chapter we covered more practical uses of GDI+ for real-world Windows applications Topics discussed in this chapter included how to write interactive GUI rectangular and nonrectangular Windows applications, how to add custom text to images, how to read and write images to and from a stream or database, and finally, how to create owner-drawn controls
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Appendix A Exception Handling in NET
The handling of exceptions and errors is critical to the development of reliable and stable applications You may have noticed that no exception handling was included in the sample applications in this book There are several reasons for this First, omitting exception handling code simply makes the source a lot easier to read Second, you might encounter new objects that we haven't discussed yet After you read this appendix, you should implement error handling (also known as exception management) in your applications Efficient exception management allows developers to write reliable and robust code that helps anticipate exceptions and, in doing so, provides an opportunity to present more informative and user-friendly error messages If you come from a C++ background, you are probably familiar with techniques such as C++ exception handling, structured exception handling, and MFC exceptions If you come from a Visual Basic background, you are probably familiar with the On Error statement Before NET, every language implemented its own error handling With NET, all languages that create managed code share the same error handling mechanism All NET-supported languages (C#, VC++NET, VBNET, VJ#) enjoy the same rich exception handling C++ developers will probably be familiar with the trycatch block, which provides structured exception handling Suspect code is placed within a try block, and when an exception occurs, the control is directed to thecatch block We will discuss the trycatch block in more detail in the following sections