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By setting the properties of the DataGrid column objects, you can control how entire columns are formatted But in many cases, it s more useful to flag rows that contain specific data For example, you may want to draw attention to high-priced products or expired shipments You can apply this sort of formatting programmatically by handling the DataGridLoadingRow event The LoadingRow event is a powerful tool for row formatting It gives you access to the data object for the current row, allowing you to perform simple range checks, comparison, and more complex manipulations It also provides the DataGridRow object for the row, letting you format the row with different colors or a different font However, you can t format just a single cell in that row for that, you need DataGridTemplateColumn and a custom value converter The LoadingRow event fires once for each row when it appears on screen.

The advantage of this approach is that your application is never forced to format the whole grid; instead, LoadingRow fires only for the rows that are currently visible But there s also a downside As the user scrolls through the grid, the LoadingRow event is triggered continuously As a result, you can t place time-consuming code in the LoadingRow method unless you want scrolling to grind to a halt There s also another consideration: item container recycling To lower its memory overhead, the DataGrid reuses the same DataGridRow objects to show new data as you scroll through the data (That s why the event is called LoadingRow rather than CreatingRow) If you re not careful, the DataGrid can load data into an already-formatted DataGridRow To prevent this from happening, you must explicitly restore each row to its initial state.

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void TimerElapsed(object sender, ElapsedEventArgs e) { Messages.Add("Timer fired!"); } The attribute s static Dispatcher property can then be set at application startup. It is probably best that the reference be factored out into an interface as in the previous examples so that the decorated methods can be run in a unit testing environment with no ill effects.

In the following example, high-priced items are given a bright orange background (see Figure 22-11) Regular-price items are given the standard white background: // Reuse brush objects for efficiency in large data displays private SolidColorBrush highlightBrush = new SolidColorBrush(ColorsOrange); private SolidColorBrush normalBrush = new SolidColorBrush(ColorsWhite); private void gridProducts_LoadingRow(object sender, DataGridRowEventArgs e) { // Check the data object for this row Product product = (Product)eRowDataContext;.

// Apply the conditional formatting. if (product.UnitCost > 100) { e.Row.Background = highlightBrush; } else { // Restore the default white background. This ensures that used, // formatted DataGrid objects are reset to their original appearance. e.Row.Background = normalBrush; } }

Figure 5-2. New Web Site dialog box 8. Modify Default.htm such that it contains the following HTML: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>ActiveX triggered identity selector</title> </head> <body> <form method=post action="Placeholder.aspx"> <input type="submit" "Submit Information Card" /> <object type="application/x-informationcard" name="xmlToken"> <param name="tokenType" value="urn:oasis:names:tc:SAML:1.0:assertion" /> <param name="issuer" value="http://schemas.xmlsoap.org/ws/2005/05/identity/issuer/self" /> <param name="requiredClaims" value="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname http://schemas.xmlsoap.org/ws/2005/05/identity/claims/locality http://schemas.xmlsoap.org/ws/2005/05/identity/claims/country" /> </object> </form> </body> </html>

Remember, you have another option for performing value-based formatting: you can use a value converter that examines bound data and converts it to something else. This technique is especially powerful when combined with a DataGridTemplateColumn. For example, you can create a templatebased column that contains a TextBlock, and bind the TextBlock.Background property to a value converter that sets the color based on the price. Unlike the LoadingRow approach shown previously, this technique allows you to format just the cell that contains the price, rather than the whole row. For more information about this technique, refer to 20.

Note The formatting you apply in the LoadingRow event handler applies only when the row is loaded. If you

edit a row, this LoadingRow code doesn t fire (at least, not until you scroll the row out of view and then back into sight).

The DataGrid also supports row details an optional, separate display area that appears just under the column values for a row. The row-details area adds two things that you can t get from columns alone: x x It spans the full width of the DataGrid and isn t carved into separate columns, which gives you more space to work with. You can configure the row-details area so that it appears only for the selected row, allowing you to tuck the extra details out of the way when they re not needed.

Note Listing 4 30 uses an Aspect Oriented Programming framework for .Net called PostSharp, which weaves MSIL code into the decorated method.

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