Edit

Share via

TemplateField Constructor

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Initializes a new instance of the TemplateField class.

public TemplateField();

Examples

The following code example demonstrates how to use the constructor to dynamically add a TemplateField field column to a GridView control.


<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  // Create a template class to represent a dynamic template column.
  public class GridViewTemplate : ITemplate
  {
    private DataControlRowType templateType;
    private string columnName;
   
    public GridViewTemplate(DataControlRowType type, string colname)
    {
      templateType = type;
      columnName = colname;
    }

    public void InstantiateIn(System.Web.UI.Control container)
    {
      // Create the content for the different row types.
      switch(templateType)
      {
        case DataControlRowType.Header:
          // Create the controls to put in the header
          // section and set their properties.
          Literal lc = new Literal();
          lc.Text = "<b>" + columnName + "</b>";
          
          // Add the controls to the Controls collection
          // of the container.
          container.Controls.Add(lc);
          break;
        case DataControlRowType.DataRow:
          // Create the controls to put in a data row
          // section and set their properties.
          Label firstName = new Label();
          Label lastName = new Label();
          
          Literal spacer = new Literal();
          spacer.Text = " ";
          
          // To support data binding, register the event-handling methods
          // to perform the data binding. Each control needs its own event
          // handler.
          firstName.DataBinding += new EventHandler(this.FirstName_DataBinding);
          lastName.DataBinding += new EventHandler(this.LastName_DataBinding);
          
          // Add the controls to the Controls collection
          // of the container.
          container.Controls.Add(firstName);
          container.Controls.Add (spacer);
          container.Controls.Add(lastName);
          break;
          
        // Insert cases to create the content for the other 
        // row types, if desired.
          
        default:
          // Insert code to handle unexpected values.
          break; 
      }
    }
    
    private void FirstName_DataBinding(Object sender, EventArgs e)
    {
      // Get the Label control to bind the value. The Label control
      // is contained in the object that raised the DataBinding 
      // event (the sender parameter).
      Label l = (Label)sender;
      
      // Get the GridViewRow object that contains the Label control. 
      GridViewRow row = (GridViewRow)l.NamingContainer;
      
      // Get the field value from the GridViewRow object and 
      // assign it to the Text property of the Label control.
      l.Text = DataBinder.Eval(row.DataItem, "au_fname").ToString();
    }
    
    private void LastName_DataBinding(Object sender, EventArgs e)
    { 
      // Get the Label control to bind the value. The Label control
      // is contained in the object that raised the DataBinding 
      // event (the sender parameter).
      Label l = (Label)sender;
      
      // Get the GridViewRow object that contains the Label control.
      GridViewRow row = (GridViewRow)l.NamingContainer;
      
      // Get the field value from the GridViewRow object and 
      // assign it to the Text property of the Label control.
      l.Text = DataBinder.Eval(row.DataItem, "au_lname").ToString();
    }
  }

  void Page_Load(Object sender, EventArgs e)
  {
    
    // The field columns need to be created only when the page is
    // first loaded. 
    if (!IsPostBack)
    {
      // Dynamically create field columns to display the desired
      // fields from the data source. Create a TemplateField object 
      // to display an author's first and last name.
      TemplateField customField = new TemplateField();

      // Create the dynamic templates and assign them to 
      // the appropriate template property.
      customField.ItemTemplate = new GridViewTemplate(DataControlRowType.DataRow, "Author Name");
      customField.HeaderTemplate = new GridViewTemplate(DataControlRowType.Header, "Author Name");

      // Add the field column to the Columns collection of the
      // GridView control.
      AuthorsGridView.Columns.Add(customField);
    }
  
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TemplateField Constructor Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>TemplateField Constructor Example</h3>

      <asp:gridview id="AuthorsGridView" 
        datasourceid="AuthorsSqlDataSource" 
        autogeneratecolumns="False"
        runat="server">                
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="AuthorsSqlDataSource"  
        selectcommand="SELECT [au_fname], [au_lname] FROM [authors]"
        connectionstring="server=localhost;database=pubs;integrated security=SSPI"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Remarks

Use this constructor to initialize a new instance of the TemplateField class. This constructor is commonly used when adding fields to a dynamically created data-bound control.

To dynamically add a TemplateField object to a data-bound control, create a new TemplateField object, define the appropriate templates, and then add it to the data-bound control's field collection. For example, if you are using the GridView control, add the TemplateField object to the Columns collection.

Note

Although you can dynamically add fields to a data-bound control, it is strongly recommended that fields be statically declared and then shown or hidden, as appropriate. Statically declaring all your fields reduces the size of the view state for the parent data-bound control.

Applies to

Product Versions
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

See also