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CHAPTER 12 PROGRAMMING DATAADAPTER AND DATASET OBJECTS
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vew0Name = New DataView(das1.Tables(0)) vew0Name.Sort = "Name" vew0ProductCategoryID = New DataView(das1.Tables(0)) vew0ProductCategoryID.Sort = "ProductCategoryID" vewFiltered = New DataView(das1.Tables(1))
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Showing the Values in a DataView
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A DataView object offers a view of the values in a DataTable. Therefore, a DataView has the same number and order of columns as the DataTable used to define the DataView. This is an important consideration because a DataTable has a richer structure than a DataView. You can use the structure of a DataTable used to define a DataView and to navigate through the elements of a DataView. The Button1_Click and the PrintView procedures jointly demonstrate how to view the values in the vew0Name and vew0ProductCategoryID DataView objects. The Button1_Click procedure has two calls for the PrintView procedure. The first call invokes the PrintView procedure for the vew0Name DataView. The second PrintView call is for the vew0ProductCategoryID DataView. The PrintView procedure takes three arguments: the name of a DataView for which to display values, the index value for a DataTable in the das1 DataSet, and a String value that specifies a heading for the report of the DataView values. The declaration of the das1 variable as a DataSet is at the module level. The variable is assigned a value in the Load procedure. The PrintView procedure is quite general and will work for any DataView based on a DataTable in the das1 DataSet. The following listing shows the code inside the Button1_Click procedure. Each procedure call for PrintView specifies three argument values. PrintView(vew0Name, 0, _ "ProductCategory by Name") PrintView(vew0ProductCategoryID, 0, _ "ProductCategory by ProductCategoryID") The PrintView procedure uses two nested For loops to iterate through successive columns of each row within the name of the DataView passed to it. The outer For loop passes through the rows of the view. The Count property returns the number of rows in a DataView. A DataView object does not have a Columns collection, but you can use the Columns collection for a DataView s underlying DataTable to pass through the columns of a DataView. The inner loop for the code in the PrintView procedure demonstrates the syntax for accomplishing this goal. The PrintView procedure constructs a String variable (str1) with the column values for successive rows in a DataView. The procedure concludes by passing str1 to the Show method of the MessageBox class to present a message box with the values. Sub PrintView(ByVal vew As DataView, _ ByVal tabindx As Integer, _ ByVal RepTitle As String)
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CHAPTER 12 PROGRAMMING DATAADAPTER AND DATASET OBJECTS
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Dim str1 As String = RepTitle & StrDup(2, ControlChars.CrLf) For int1 As Integer = 0 To vew.Count - 1 For int2 As Integer = 0 To das1.Tables(tabindx).Columns.Count - 1 str1 += vew(int1)(int2).ToString & ", " Next str1 = Microsoft.VisualBasic.Left(str1, Len(str1) - 2) str1 += ControlChars.CrLf Next MsgBox(str1) End Sub
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Changing the Sort Order in a DataGridView Control
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The DataGridView control is a new control introduced with Visual Basic Express (the control is also available in other Visual Studio 2005 editions). The DataGridView is Microsoft s latest generation of a grid control for displaying data in a tabular format. A comparable ASP .NET control, the GridView control, exists with the same name for Web Forms that you can use with Visual Web Developer Express. As mentioned previously, you can instantiate multiple views of a DataTable to present values in any of several different sorted orders. Although you can display DataView values with a message box, it is more common to see them in grids. There is a natural congruence between a DataGridView control and a DataView object. A DataView object holds multiple column values for multiple rows, and a DataGridView control can display multiple columns of data for multiple rows. This congruence makes it especially easy to assign a DataView for display in a DataGridView control. If you have more than one DataView object based on a DataTable object, it is especially easy to dynamically change the view showing in a DataGridView control based on user actions or environmental variables. For example, you can show one view of data for one user or for users in one role, and you can show a different view of data for another user or users in another role. Another scenario is one where you display sales data by sales person, region, or customer. You can provide other controls, such as a Button control or a ListBox control, to let a user determine which view of some data will be shown in a DataGridView control. Button2 and Button3 populate the DataGridView1 control with ProductCategories DataTable values sorted by Name column values or ProductCategoryID column values. Recall that two DataView objects created in the Load event procedure create two views that show values these two different ways. The vew0Name DataView makes rows of data available sorted by Name column values. The vew0ProductCategoryID DataView makes rows of data available sorted by ProductCategoryID column values. By assigning either the vew0Name DataView or vew0ProductCategoryID DataView to the DataSource property of a DataGrid control, you can dynamically change how data display in a DataGridView control. Figure 12-3 shows DataGridView1 control with two different views of values from the same DataTable. Clicking the Sort by name button assigns the vew0Name DataView to the DataSource property of DataGridView1, and the rows instantly appear sorted as they are in the left pane. Clicking the Sort by ID button assigns the vew0ProductCategoryID DataView to the DataSource property of DataGridView1. The new assignment to the DataSource property instantly arranges the rows in the order shown in the right pane of Figure 12-3.
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