Object-Oriented Method to Display Hidden Data in a DataGrid in .NET

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Object-Oriented Method to Display Hidden Data in a DataGrid
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The Employee class was created with the EID, which is a public read-only member variable. In the DataList and DataGrid examples, the public properties were displayed, while a more creative method was required to get to the EID. In these examples, the source code for the Employees class was available, so a simple way to get access to the EID would be to add another public property to the Employee class. How is this problem solved if the source code is unavailable If the Employee class was provided as a compiled .dll file with no source code, it s not possible to simply add the property. Instead, a new class can be created that inherits from the Employee class. The following code is an example of a new class called EmployeeData, which inherits from Employee. This class has the additional read-only property called EmployeeID. The rest of the properties are available through inheritance.
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Public Class EmployeeData Inherits Employee Public Sub New(ByVal EID As Integer, _ ByVal LastName As String, _ ByVal FirstName As String, _ ByVal Salary As Decimal) MyBase.New(EID, LastName, FirstName, Salary) End Sub Public ReadOnly Property EmployeeID() As Integer Get Return EID End Get End Property End Class
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This class could be used to create an EmployeeData collection instead of the Employee collection. The EmployeeData collection could be assigned to the data source of the DataGrid.
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This is one example method of populating the Employee ID column. Another method of populating the Employee ID column is to use an objectoriented approach as described in the sidebar titled Object-Oriented Method to Display Hidden Data in a DataGrid.
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With the HTML page, the DataGrid tag can contain a columns collection. Another method of adding the EID column is by adding a template column tag in the DataGrid HTML tag. The following code is an example of the added template column. This code is similar to the DataList template code:
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<asp:DataGrid id= DataGrid1 runat= server > <columns> <asp:TemplateColumn HeaderText= Employee ID > <itemtemplate> <%# string.Format( {0:D4} ,Container.DataItem.EID ) %> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:DataGrid>
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Visual Studio .NET also provides a property builder that can be used to insert columns via GUI windows. The property builder can be accessed by right-clicking the DataGrid and then clicking Property Builder. Figure 6.12 shows the Property Builder screen.
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Figure 6.12 Most DataGrid properties may be assigned with the DataGrid Property Builder.
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Ordering Columns Although all columns may be displayed, the order of the fields may not be appropriate. In addition, different header text may be required. In the previous example, the fields were automatically added, but it s usually better to manually create the columns and set their properties. Once again, the columns may be added manually via code, the HTML window, or the Property Builder. All of the examples that follow are done in code. The columns need to be added to the DataGrid s Init event method. In the following code example, all four columns are manually added in the appropriate order and with the desired header text.
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Private Sub DataGrid1_Init(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles DataGrid1.Init DataGrid1.AutoGenerateColumns = False Dim col As New BoundColumn() col.HeaderText = Employee<BR>ID col.ItemStyle.HorizontalAlign = HorizontalAlign.Right col.HeaderStyle.HorizontalAlign = HorizontalAlign.Center col.ItemStyle.Width = New Unit(75, UnitType.Pixel) DataGrid1.Columns.Add(col) Store this info for later use. DataGrid1.Attributes( EidCol ) = DataGrid1.Columns.Count - 1 col = New BoundColumn() col.HeaderText = Last<BR>Name col.DataField = LastName col.HeaderStyle.HorizontalAlign = HorizontalAlign.Center col.ItemStyle.Width = New Unit(200, UnitType.Pixel) DataGrid1.Columns.Add(col) DataGrid1.Attributes( LastNameCol ) = _ DataGrid1.Columns.Count - 1 col = New BoundColumn() col.HeaderText = First<BR>Name col.DataField = FirstName col.HeaderStyle.HorizontalAlign = HorizontalAlign.Center col.ItemStyle.Width = New Unit(200, UnitType.Pixel) DataGrid1.Columns.Add(col) DataGrid1.Attributes( FirstNameCol ) = _ DataGrid1.Columns.Count - 1 col = New BoundColumn() col.HeaderText = Salary col.DataField = Salary col.DataFormatString = {0:C} col.ItemStyle.HorizontalAlign = HorizontalAlign.Right col.HeaderStyle.HorizontalAlign = HorizontalAlign.Center col.ItemStyle.Width = New Unit(150, UnitType.Pixel) DataGrid1.Columns.Add(col) DataGrid1.Attributes( SalaryCol ) = _ DataGrid1.Columns.Count - 1 End Sub
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