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【正文】 46 附錄 1 英文原文 Add Style to Your DataGrids with TemplateColumn By Christopher Goldfarb Introduction Typically when you bind data to a DataGrid, you get a basic table, one row for each record, and one cell for each column of data. While this may satisfy many of your needs, it often does not address the specific layout you have in mind. While a DataList or a Repeater may seem like a quick solution, it often means giving up some of the functionality that only the DataGrid offers, such as column sorting and paging. An alternative is to use the DataGrid, and provide custom layout options. These options exist in the form of different types of databound columns and custom templates. In this article, I39。ll explain what the TemplateColumn provides to * developers, and how it can be used to tailor the look and feel of datadriven output into rich layouts. Finally, I39。ll discuss how data can be edited, using the different server controls placed within the TemplateColumn. What is TemplateColumn? provides a mechanism called the TemplateColumn, a column type for the DataGrid control, which allows you to customize the layout of columns. Using TemplateColumn controls in the DataGrid gives you plete control over the contents of the column. The template is just arbitrary content。 you can render anything you like, including server controls, a dropdown list, a check box, and so forth inside the DataGrid39。s columns. The use of a TemplateColumn does not prevent you from using BoundColumns, HyperlinkColumns, ButtonColumns, or EditCommandColumns in the DataGrid. All of the different databound columns may be used together, if the situation calls for it. 山東科技大學(xué)本科畢業(yè)設(shè)計（論文） 47 You can provide a custom appearance for the heading section, the footer section, and items section of the column by using the HeaderTemplate, FooterTemplate, and ItemTemplate properties, respectively. You can also control how an item being edited is displayed in the TemplateColumn by setting the EditItemTemplate property. Preparing to Use the TemplateColumn To use this feature, you must stop the DataGrid from automatically generating the columns based on the data in your table. This is done with the AutoGenerateColumns property of the DataGrid. Setting this property to False will stop the DataGrid from generating the columns and enable you to generate a custom layout. Properties and Methods TemplateColumn allows you to create fully customized output within the DataGrid, using up to four different templates. The four template types are: ? HeaderTemplate ? FooterTemplate ? ItemTemplate ? EditItemTemplate The first three provide a custom appearance for the heading section, the footer section, and items section of the column, respectively. The fourth template controls how an item being edited is displayed in the TemplateColumn. The HeaderTemplate displays text, images, or bound data in the header row for this column. The following three properties, all of which are inh erited from DataGridColumn, are provided for customization of the header: ? HeaderImageUrl—gets or sets the location of an image to be displayed in the header section of the column. 山東科技大學(xué)本科畢業(yè)設(shè)計（論文） 48 ? HeaderStyle—gets the style properties for the header section of the column. ? HeaderText—gets or sets the text displayed in the header section of the column. The FooterTemplate, similar to the HeaderTemplate, gets or sets the template for displaying the footer section of the TemplateColumn. The following two properties, both of which are inherited from DataGridColumn, are provided for customization of the footer: ? FooterStyle—gets the style properties for the footer section of the column. ? FooterText—gets or sets the text displayed in the footer section of the column. The ItemTemplate gets or sets the template for displaying a data item in a TemplateColumn. In other words, it allows you to create a custom layout for the data you want to display. The ItemStyle property, inherited from DataGridColumn, gets the style properties for the item cells of the column. The EditItemTemplate gets or sets the template for displaying the item selected for editing in a TemplateColumn. In other words, it is an alternate display of the data in the template for use with DataGrid editing. The TemplateColumn class also provides the following useful properties, both of which are inherited from the DataGridColumn class*: ? SortExpression—gets or sets the name of the field or expression to pass to the OnSortCommand method when a column is selected for sorting. ? Visible—gets or sets a value that indicates whether the column is visible in the DataGrid control*. The TemplateColumn class also provides a set of public methods to assist in the customization process: 山東科技大學(xué)本科畢業(yè)設(shè)計（論文） 49 ? Equals—inherited from the Object class, an overloaded method that determines whether two Object instances are equal. ? GetHashCode—also inherited from the Object class, serves as a hash function for a particular type. This method is suitable for hashing algorithms and data structures, such as a hash table. ? GetType—also inherited from the Object class, gets the Type of the current instance. ? Initialize—inherited from the DataGridColumn class, provides the base implementation to reset a column derived from the DataGridColumn class to its initial state. ? InitializeCell—inherited from the DataGridColumn class, provides the base implementation to reset the specified cell from a column derived from the DataGridColumn class to its initial state. ? ToString—inherited from the Object class, returns a string that represents the current Object. The TemplateColumn class also provides a set of protected properties. ? DesignMode—inherited from the DataGrid