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Dim gv As New GridView()
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gv.Style.Add("position", "absolute")
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gv.Style.Add("left", "275px")
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gv.Style.Add("top", "20px")
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gv.EnableViewState = False
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form1.Controls.Add(gv)
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Dim xmlTable as New DataTable()
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xmlTable.ReadXml(Server.MapPath("PersonWithSchema.xml"))
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gv.DataSource = xmlTable
gv.DataBind()
End Sub //C# protected void Button8_Click(object sender, EventArgs e) { //add grid to form GridView gv = new GridView(); gv.Style.Add("position", "absolute"); gv.Style.Add("left", "275px"); gv.Style.Add("top", "20px"); gv.EnableViewState = false; form1.Controls.Add(gv); //get the table and display DataTable xmlTable = new DataTable(); xmlTable.ReadXml(Server.MapPath("PersonWithSchema.xml")); gv.DataSource = xmlTable; gv.DataBind(); }
4
Using ADO.NET and XML with ASP.NET
Although the data for the LastName and FirstName column was not saved, the col umn data is populated because this column is derived and the schema contains the expression to re-create this column data.
Opening a DataView Window in a DataTable
The DataView object provides a window into a DataTable that can be sorted and fil tered using the Sort, RowFilter, and RowStateFilter properties. A DataTable can have many DataView objects assigned to it, allowing the data to be viewed in many different ways without requiring the data to be reread from the database. The DataView object also contains the AllowDelete, AllowEdit, and AllowNew properties to constrain user input as needed. If you look at the DataView object s internal structure, you will find that it is essen tially an index. You can provide a sort definition to sort the index in a certain order, and you can provide a filter to filter the index entries.
Ordering Data Using the Sort Property
The Sort property requires a sort expression. The default order for the sort is ascending, but you can specify ASC or DESC with a comma-separated list of columns to be sorted. In the following code snippet, the employee DataTable is retrieved, additional rows are added, and a DataView is cre ated on the employee DataTable with a compound sort on the LastName column and the FirstName column in ascending order and on the Salary column in descending order.
'VB Protected Sub Button9_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Button9.Click 'add grid to form Dim gv As New GridView() gv.Style.Add("position", "absolute") gv.Style.Add("left", "275px") gv.Style.Add("top", "20px") gv.EnableViewState = False form1.Controls.Add(gv) 'get datatable Dim employee As DataTable = GetDataTable() 'Add New DataRow by adding the values employee.Rows.Add("ABC345DEF1", "Thomas", "Andersen", 25.00) employee.Rows.Add("123ABC345D", "Sean", "Chai" , 20.00) employee.Rows.Add("345DEF123A", "Erik", "Andersen", 22.00) employee.Rows.Add("DEF123ABC3", "Nancy", "Andersen", 8.00) 'sort and display Dim view As New DataView(employee)
Lesson 1: Using the ADO.NET Disconnected Classes
view.Sort = "LastName ASC, FirstName ASC, Salary gv.DataSource = view
gv.DataBind()
End Sub
DESC"
//C# protected void Button9_Click(object sender, EventArgs e) { //add grid to form GridView gv = new GridView(); gv.Style.Add("position", "absolute"); gv.Style.Add("left", "275px"); gv.Style.Add("top", "20px"); gv.EnableViewState = false; form1.Controls.Add(gv); //get datatable DataTable employee = GetDataTable(); //Add New DataRow by adding the values employee.Rows.Add("ABC345DEF1", "Thomas", "Andersen", 25.00m); employee.Rows.Add("123ABC345D", "Sean", "Chai" , 20.00m); employee.Rows.Add("345DEF123A", "Erik", "Andersen", 22.00m); employee.Rows.Add("DEF123ABC3", "Nancy", "Andersen", 8.00m); //sort and display DataView view = new DataView(employee); view.Sort = "LastName ASC, FirstName ASC, Salary DESC"; gv.DataSource = view; gv.DataBind(); }
Figure 4-5 shows the sorted DataView when the Web page is run.
Figure 4-5
The sorted employee DataView object.
4
Using ADO.NET and XML with ASP.NET
Narrowing the Search with the RowFilter and RowStateFilter Properties The DataView
filters comprise a RowFilter and a RowStateFilter. The RowFilter is set to a SQL "WHERE" clause without the word "WHERE." The following code shows a filter on the LastName column for employees whose names begin with the letter A and on the Salary column for employees whose salaries are greater than 15.
'VB view.RowFilter = "LastName like 'A%' and Salary > 15" //C# view.RowFilter = "LastName like 'A%' and Salary > 15";
The RowStateFilter provides a filter based on the DataRow object s RowState property. This filter provides an extremely easy way to retrieve specific version information within the DataTable using one of the DataViewRowState enumeration values, which are as follows:
Added
Retrieves the Current DataRowVersion of DataRow objects that have a RowState of Added. Retrieves all DataRow objects that have a Current DataRowVersion.
CurrentRows
Deleted Retrieves the Original DataRowVersion of DataRow objects that have a RowState of Deleted. Retrieves the Current DataRowVersion of DataRow objects that have a RowState of Modified.
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