Figure 1319 Don't Use the datasettable + Column Technique to Specify the Data Source in VS .NET

Making QR Code 2d barcode in VS .NET Figure 1319 Don't Use the datasettable + Column Technique to Specify the Data Source
Figure 1319 Don't Use the datasettable + Column Technique to Specify the Data Source
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Instead, make sure that you pick a data set for the DataSource property and pick a tablecolumn for the DisplayMember and ValueMember properties, as shown in Figure 1320
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Figure 1320 Use the Dataset + tablecolumn Technique to Specify a Data Source
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After you've set the data source and the display member, you'll get an automatically populated list control, just as we've been pining for since this chapter began (and as shown in Figure 1321)
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Figure 1321 Using Data Binding to Populate a List Control
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In addition to a nicely filled list box, notice that Figure 1321 shows the data for the same row in both of the text boxes as in the currently selected list box item As the list box selection changes, the position is updated for the shared currency manager Using the VCR-style buttons would likewise change the position and update the list box's selection accordingly Also, notice that the status bar is updated with the CustomerID of the current row as the position changes You do this using the SelectedItem property of the list control, which exposes the currently selected item: void listBox1_SelectedIndexChanged(object sender, EventArgs e) { if( listBox1SelectedValue == null ) return; // Get the currently selected row's CustomerID using current item DataRowView view = (DataRowView)listBox1SelectedItem; CustomerSetCustomersRow row = (CustomerSetCustomersRow)viewRow; statusBar1Text = "Selected CustomerID= " + rowCustomerID; } As a convenience, you can set the ValueMember property to designate a property as the value of the selected row This is useful for primary keys when you want to know what was selected without knowing any of the other details Using the ValueMember property, you can directly extract the ID of the currently selected row: void InitializeComponent() {
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thislistBox1ValueMember = "CustomersCustomerID"; } void listBox1_SelectedIndexChanged(object sender, EventArgs e) { if( listBox1SelectedValue == null ) return; // Get the currently selected row's CustomerID statusBar1Text = "Selected CustomerID= " + listBox1SelectedValue; }
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Data Views
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So far we've discussed how to show specific data members, such as specific columns, from a data source However, it's also useful to filter which rows from a data table are shown as well as to sort the rows This kind of functionality is provided by a data view , which allows you to transform a data table as it's being displayed in ways that the Format and Parse events can't
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Sorting
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You can sort on any number of columns in either ascending or descending order Setting the sort criteria is a matter of creating an instance of the DataView class, setting the Sort property, and then binding to the view as the data source: void CurrencyForm_Load(object sender, EventArgs e) { // Create a sorting view DataView sortView = new DataView(customerSet1Customers); sortViewSort = "ContactTitle ASC, ContactName DESC"; // Bind to the view listBox1DataSource = sortView; listBox1DisplayMember = "ContactTitleName"; // Fill the data set } Notice that the DataView object takes a DataTable argument so that it knows where to get its data Notice also the ASC (default) and DESC designators, which indicate ascending and descending sort order, respectively Binding to the sorted view of our customers table yields Figure 1322
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Figure 1322 Binding to a Sort View
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Filtering
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Similarly, filtering is a matter of creating an instance of the DataView class, setting the RowFilter property, and binding to the view: void CurrencyForm_Load(object sender, EventArgs e) { // Create a filtering view DataView filterView = new DataView(customerSet1Customers); filterViewRowFilter = "ContactTitle = 'Owner'"; // Bind to the view listBox1DataSource = filterView; listBox1DisplayMember = "ContactTitleName"; // Fill the data set } Binding to this view of our customers data table shows only rows where the ContactTitle column has the value of "Owner," as shown in Figure 1323
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Figure 1323 Binding to a Filtered View
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The expression language used for filtering is a subset of SQL You can find a link to the documentation in the description of the DataView class's RowFilter property
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