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.NET Table 17.3 DataGridColumnStyle class
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The DataGridColumnStyle class represents a specific column that should appear when a specific style table is displayed in a DataGrid control. This object is typically contained within a DataGridTableStyle object, and indicates the position and style for the corresponding column when a table of the specified type is displayed. This class is part of the System.Windows.Forms namespace, and inherits from the System.ComponentModel.Component class. A DataGridColumnStyle object cannot be instantiated, as this is an abstract class. The DataGridBoolColumn and DataGridTextBoxColumn classes derived from this class are used to represent a column of boolean or textual values, respectively. Custom column styles derived from this class may also be created. Alignment DataGridTableStyle HeaderText MappingName Gets or sets the alignment of data within the column. Gets the table style containing this column style. Gets or sets the header text for this column when the associated table style is used. Gets or sets the name used to associate this column style with a specific data value in an associated data source. For an IList data source, a valid property name in the list should be specified. For a DataSet data source, a valid column name in the associated table should be provided. Gets or sets the text that is displayed when the column contains a null reference. Gets or sets the PropertyDescriptor object containing attributes of the data displayed by this column style. Gets or sets whether to treat the column as read-only. Gets or sets the width in pixels for this column. Resets the HeaderText property to its default value, which is a null reference. Occurs when the Alignment property for the column style changes. Occurs when the column s font changes. A number of other changed events exist with a similar purpose.
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Public Properties NullText PropertyDescriptor
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ReadOnly Width Public Methods ResetHeaderText AlignmentChanged Public Events FontChanged
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The order in which columns are assigned to a table style determines the order in which they will appear in the data grid. We will use this feature to extend the table style we created for our form to display only a subset of the available columns. The code to make this change is detailed in the following table. Note that this code uses the DataGridBoolColumn and DataGridTextBoxColumn classes. We will discuss these classes in more detail in a moment.
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DATA GRID CUSTOMIZATION
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CUSTOMIZE THE COLUMNS TO APPEAR IN THE DATA GRID Action 1 Locate the OnLoad method in the MainForm.cs code window. Create a column style for the
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Caption property. How-to
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Result
protected override void OnLoad(EventArgs e) { . . . // Table style for PhotoAlbum data source . . . // Column styles for PhotoAlbum source DataGridColumnStyle captionCol = new DataGridTextBoxColumn(); captionCol.MappingName = "Caption"; captionCol.HeaderText = "Caption"; captionCol.Width = 100; DataGridColumnStyle validCol = new DataGridBoolColumn(); validCol.MappingName = "IsImageValid"; validCol.HeaderText = "Valid "; validCol.ReadOnly = true; validCol.Width = 30; DataGridTextBoxColumn dateCol = new DataGridTextBoxColumn(); dateCol.MappingName = "DateTaken"; dateCol.HeaderText = "Date Taken"; dateCol.Alignment = HorizontalAlignment.Center; dateCol.Format = "d"; dateCol.Width = 80; DataGridColumnStyle photographerCol = new DataGridTextBoxColumn(); photographerCol.MappingName ="Photographer"; photographerCol.HeaderText = "Photographer"; photographerCol.Width = 100; DataGridColumnStyle fileNameCol = new DataGridTextBoxColumn(); fileNameCol.MappingName = "FileName"; fileNameCol.HeaderText = "Image File Name"; fileNameCol.ReadOnly = true; fileNameCol.Width = 200;
Use the DataGridTextBoxColumn class and assign the MappingName to match the Caption property name. 3 Create column styles for the
IsImageValid, DateTaken, Photographer, and FileName
properties as well.
How-to
Use the class specified for each property in the following table.
Column Style Classes Property IsImageValid DateTaken Photographer FileName Class BoolColumn TextBoxColumn TextBoxColumn TextBoxColumn
Add the new column styles to the GridColumnStyles property of the existing table style object.
How-to
Use the AddRange method to add all column styles at once.
// Add the column styles to the table style albumStyle.GridColumnStyles.AddRange( new DataGridColumnStyle[] { captionCol, validCol, dateCol, photographerCol, fileNameCol }); // Assign the table style to the data grid gridPhotoAlbum.TableStyles.Add(albumStyle); }
This adds the new column styles to the existing table style object. When a data source of type PhotoAlbum is displayed, the new styles specify which columns should
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DATA BINDING
appear and how they should look. For example, the column style based on the IsImageValid property is as follows:
DataGridColumnStyle validCol = new DataGridBoolColumn(); validCol.MappingName = "IsImageValid"; validCol.HeaderText = "Valid "; validCol.ReadOnly = true; validCol.Width = 30;
This column will appear as read-only with a width of 30 pixels. The column header is modified to use the string "Valid " rather than the property name. This column is our only column based on the DataGridBoolColumn class. This class appears as a check box, which is checked only if the corresponding value is true. In fact, the displayed check box is a three-state check box in order to support a null state in addition to true and false. The remaining column styles are all based on the DataGridTextBoxColumn class. A summary of this class appears in .NET Table 17.4. Of particular note is the date column, which uses the Format property in this class to display the date value as a short date string. The Alignment property from the base class is also assigned for this column in order to center the displayed date.
DataGridTextBoxColumn dateCol = new DataGridTextBoxColumn(); dateCol.MappingName = "DateTaken"; dateCol.HeaderText = "Date Taken"; dataCol.Alignment = HorizontalAlignment.Center; dateCol.Format = "d"; dateCol.Width = 80;
Compile and run the application to see your code in action. The application should appear as in figure 17.4 at the start of this section.
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