ButtonType ButtonType ButtonType ButtonType Enum

Definizione

Specifica i diversi tipi di pulsanti di cui è possibile eseguire il rendering in una pagina Web Form.Specifies the different types of buttons that can be rendered in a Web Forms page.

public enum class ButtonType
public enum ButtonType
type ButtonType = 
Public Enum ButtonType
Ereditarietà

Campi

Button Button Button Button 0

Un pulsante di comando.A command button.

Image Image Image Image 1

Un pulsante che visualizza un'immagine.A button that displays an image.

2

Un pulsante con lo stile di un collegamento ipertestuale.A hyperlink-style button.

Esempi

Nell'esempio seguente viene illustrato come utilizzare l' ButtonType enumerazione per specificare che i pulsanti di collegamento vengono visualizzati ButtonField in una colonna del GridView campo di un controllo.The following example demonstrates how to use the ButtonType enumeration to specify that link buttons are displayed in a ButtonField field column of a GridView control. La ButtonType proprietà di un ButtonField oggetto è impostata in modo dichiarativo su ButtonType.Link.The ButtonType property of a ButtonField object is declaratively set to ButtonType.Link.


<%@ 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">

  void AuthorsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
  {
  
    // If multiple ButtonField column fields are used, use the
    // CommandName property to determine which button was clicked.
    if(e.CommandName=="Select")
    {
    
      // Convert the row index stored in the CommandArgument
      // property to an Integer.
      int index = Convert.ToInt32(e.CommandArgument);    
    
      // Get the last name of the selected author from the appropriate
      // cell in the GridView control.
      GridViewRow selectedRow = AuthorsGridView.Rows[index];
      TableCell lastNameCell = selectedRow.Cells[1];
      string lastName = lastNameCell.Text;  
    
      // Display the selected author.
      Message.Text = "You selected " + lastName + ".";
      
    }
    
  }
  
  void AuthorsGridView_RowCreated(Object sender, GridViewRowEventArgs e)
  {
    
    // The GridViewCommandEventArgs class does not contain a 
    // property that indicates which row's command button was
    // clicked. To identify which row contains the button 
    // clicked, use the button's CommandArgument property by 
    // setting it to the row's index.
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
    
      // Retrieve the button control from the first column.
      // Because the ButtonType property of the column field
      // is set to ButtonType.Link, the button control must be
      // cast to a LinkButton. If you specify a different button
      // type, you must cast the button control to the appropriate
      // button type.
      LinkButton selectButton = (LinkButton)e.Row.Cells[0].Controls[0];
            
      // Set the LinkButton's CommandArgument property with the
      // row's index.
      selectButton.CommandArgument = e.Row.RowIndex.ToString();
      
    }

  }
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ButtonType Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>ButtonType Example</h3>
      
      <asp:label id="Message"
        forecolor="Red"
        runat="server"
        AssociatedControlID="AuthorsGridView"/>
                    
      <!-- Populate the Fields collection declaratively. -->
      <asp:gridview id="AuthorsGridView" 
        datasourceid="AuthorsSqlDataSource" 
        autogeneratecolumns="false"
        onrowcommand="AuthorsGridView_RowCommand" 
        runat="server">
                
        <columns>
                
          <asp:buttonfield buttontype="Link" commandname="Select" text="Select"/>
          <asp:boundfield datafield="au_lname" headertext="au_lname"/>
          <asp:boundfield datafield="au_fname" headertext="au_fname"/>
                
        </columns>
                
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="AuthorsSqlDataSource"  
        selectcommand="SELECT [au_lname], [au_fname] FROM [authors]"
        connectionstring="server=localhost;database=pubs;integrated security=SSPI"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>


<%@ Page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub AuthorsGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
  
    ' If multiple ButtonField column fields are used, use the
    ' CommandName property to determine which button was clicked.
    If e.CommandName = "Select" Then
    
      ' Convert the row index stored in the CommandArgument
      ' property to an Integer.
      Dim index As Integer = Convert.ToInt32(e.CommandArgument)    
    
      ' Get the last name of the selected author from the appropriate
      ' cell in the GridView control.
      Dim selectedRow As GridViewRow = AuthorsGridView.Rows(index)
      Dim lastNameCell As TableCell = selectedRow.Cells(1)
      Dim lastName As String = lastNameCell.Text  
    
      ' Display the selected author.
      Message.Text = "You selected " & lastName & "."
      
    End If
    
  End Sub
  
  Sub AuthorsGridView_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    
    ' The GridViewCommandEventArgs class does not contain a 
    ' property that indicates which row's command button was
    ' clicked. To identify which row contains the button 
    ' clicked, use the button's CommandArgument property by 
    ' setting it to the row's index.
    If e.Row.RowType = DataControlRowType.DataRow Then
    
      ' Retrieve the button control from the first column.
      ' Because the ButtonType property of the column field
      ' is set to ButtonType.Link, the button control must be
      ' cast to a LinkButton. If you specify a different button
      ' type, you must cast the button control to the appropriate
      ' button type.
      Dim selectButton As LinkButton = CType(e.Row.Cells(0).Controls(0), LinkButton)
            
      ' Set the LinkButton's CommandArgument property with the
      ' row's index.
      selectButton.CommandArgument = e.Row.RowIndex.ToString()
      
    End If

  End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ButtonType Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>ButtonType Example</h3>
      
      <asp:label id="Message"
        forecolor="Red"
        runat="server"
        AssociatedControlID="AuthorsGridView"/>
                    
      <!-- Populate the Columns collection declaratively. -->
      <asp:gridview id="AuthorsGridView" 
        datasourceid="AuthorsSqlDataSource" 
        autogeneratecolumns="false"
        onrowcommand="AuthorsGridView_RowCommand" 
        runat="server">
                
        <columns>
                
          <asp:buttonfield buttontype="Link" commandname="Select" text="Select"/>
          <asp:boundfield datafield="au_lname" headertext="au_lname"/>
          <asp:boundfield datafield="au_fname" headertext="au_fname"/>
                
        </columns>
                
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="AuthorsSqlDataSource"  
        selectcommand="SELECT [au_lname], [au_fname] FROM [authors]"
        connectionstring="server=localhost;database=pubs;integrated security=SSPI"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Commenti

L' ButtonType enumerazione viene usata per rappresentare i diversi tipi di pulsanti (ad esempio, pulsante di comando, pulsante immagine, pulsante di collegamento e così via) di cui è possibile eseguire il rendering in una pagina ASP.NET.The ButtonType enumeration is used to represent the different types of buttons (such as command button, image button, link button, and so on) that can be rendered on an ASP.NET page. Viene comunemente usato dalle proprietà, ad esempio la ButtonType proprietà ButtonFieldBase della classe, per indicare il tipo di pulsante utilizzato dal controllo padre.It is commonly used by properties such as the ButtonType property of the ButtonFieldBase class to indicate which button type is being used by the parent control.

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