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There are two keys to understanding the DataGridTableStyle class. The first is the MappingName property. When a new source of data is assigned to a DataGrid control, the list of table styles is examined to locate a style whose MappingName setting matches the name of the table. If one is found, then that style is used to display the grid. If no match is found, then the default settings for the grid control are used. It is an error to assign identical mapping names to multiple styles within the same data grid. The second key to understanding this class is the GridColumnStyles property. This property is a collection of DataGridColumnStyle objects and specifies the selection and order of columns to display in the grid. If the GridColumnStyles property is null, then the default set of columns is displayed. We can use the DataGridTableStyle class to modify the appearance of our DataGrid control when a PhotoAlbum is displayed. We will make the very simple change of providing an alternating background color for the table. The steps required are presented in the following table.

Set the version number of the MyAlbumData application to 17 .2 PROVIDE A CUSTOM TABLE STYLE WHEN A PHOTOALBUM IS DISPLAYED Action 1 In the MainForm.cs code window, create a table style instance in the OnLoad method. Note: A table style can also be created in the [Design] window by clicking on the button in the TableStyles property. Here we elect to create the table style by hand. 2 Configure the new style for a

protected override void OnLoad(EventArgs e) { . . . // Table style for PhotoAlbum data source DataGridTableStyle albumStyle = new DataGridTableStyle();

make sure that it works properly in the TV!) However, the areas of overlap between the two industries are growing all the time, especially in the fields of content creation and digital effects If your current job is based on those kinds of skills, your chances of being able to switch over to the game industry are pretty good But you need to be aware that the game industry has grown out of a different tradition and its workplace culture is not the same as that of the older media

alternating background color of LightGray. 3 Assign the new style to the existing DataGrid control.

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albumStyle.MappingName = "PhotoAlbum"; albumStyle.AlternatingBackColor = Color.LightGray; albumStyle.RowHeaderWidth = 15; // Assign the table style to the data grid gridPhotoAlbum.TableStyles.Add(albumStyle); }

This very simple change causes the application to display as is shown in figure 17.5. Of course, the AlternatingBackColor and RowHeaderWidth properties are available in the DataGrid class and can be set explicitly for this class. Assigning them in a table style uses these properties only when a matching table name is displayed, in this case a PhotoAlbum object. Note that our choice of light gray may not work very well with some user s desktop colors. You can use an alternate color if you prefer, or a system color such as SystemColors.ControlLight. In your own applications, make sure you carefully select DATA GRID CUSTOMIZATION 575

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color choices for settings such as this, and use system settings where possible. Hardcoding a specific color such as we do here is not typically recommended, since different users may configure their desktops to appear using different sets of conflicting colors.

Figure 17.5 This figure shows an alternating background color of light gray to present a ledger-like appearance.

Note that the assignment of the MappingName is critical here. Using a name other than PhotoAlbum would have no effect on our table since the name of the table would not match the mapping name of the table style. Of course, our table still uses the default set of columns since we have not yet assigned any column styles to the GridColumnStyles property. Customizing the columns in our table is our next topic. 17.2.2 CUSTOMIZING COLUMN STYLES Now that we know how to customize the properties of a table, let s look at how to customize the columns that appear in the table. The DataGridColumnStyle class is used for this purpose, and is summarized in .NET Table 17.3. This is an abstract class from which various types of columns are derived. The .NET Framework currently provides classes to represent boolean and text columns, namely the DataGridBoolColumn and DataGridTextBoxColumn classes.

A link is a connection between elements; these elements may be elements within a file or a file in its own right Thus an icon (element) in a file can be linked to another