ButtonFieldBase.CausesValidation Vlastnost

Reference

Definice

Obor názvů:: System.Web.UI.WebControls

Sestavení:: System.Web.dll

Důležité

Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.

Získá nebo nastaví hodnotu označující, zda je provedeno ověření při kliknutí na tlačítko v objektu ButtonFieldBase .

public:
 virtual property bool CausesValidation { bool get(); void set(bool value); };

public virtual bool CausesValidation { get; set; }

member this.CausesValidation : bool with get, set

Public Overridable Property CausesValidation As Boolean

Hodnota vlastnosti

Boolean

true k ověření při kliknutí na tlačítko v objektu ButtonFieldBase . V opačném případě false. Výchozí formát je false.

Příklady

Následující příklad kódu ukazuje, jak použít CausesValidation vlastnost k provedení ověření při kliknutí na tlačítko v ButtonField objektu ovládacího prvku GridView .

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

<script runat="server">

  void AuthorsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
  {
  
    // If multiple ButtonField columns are used, use the
    // CommandName property to determine which button was clicked.
    switch(e.CommandName)
    {
    
      case "Edit":
        AuthorsGridView.Columns[0].Visible = false;
        AuthorsGridView.Columns[1].Visible = true;
        break;
      case "Update":
        AuthorsGridView.Columns[0].Visible = true;
        AuthorsGridView.Columns[1].Visible = false;
        break;
      default:
        // Do nothing.
        break;
    }
    
  }
  
  void AuthorsGridView_RowUpdating (Object sender, GridViewUpdateEventArgs e)
  {
    
    // Retrieve the row being edited.    
    int index = AuthorsGridView.EditIndex;
    GridViewRow row = AuthorsGridView.Rows[index];
    
    // Retrieve the new value for the author's first name from the row. 
    // In this example, the author's first name is in the second cell 
    // of the row (index 1). To get the value, first retrieve the TextBox
    // that contains the value.
    TextBox firstNameTextBox = (TextBox)row.Cells[1].FindControl("FirstNameTextBox");
    
    // Make sure the control was found. 
    String firstName = "";    
    if(firstNameTextBox != null)
    {
      firstName = firstNameTextBox.Text;
    }
    
    // Retrieve the new value for the author's last name from the row. 
    // In this example, the author's last name is in the third cell 
    // of the row (index 2).
    TextBox lastNameTextBox = (TextBox)row.Cells[2].FindControl("LastNameTextBox");
    
    String lastName = "";
    if(lastNameTextBox != null)
    {
      lastName = lastNameTextBox.Text;
    }
    
    // Because custom TemplateField field columns are used, parameters 
    // are not automatically created and passed to the data source control.
    // Create Parameter objects to represent the fields to update and 
    // add the Parameter objects to the UpdateParameters collection.
    Parameter lastNameParameter = new Parameter("au_lname", TypeCode.String, lastName);   
    Parameter firstNameParameter = new Parameter("au_fname", TypeCode.String, firstName);
    
    // Clear the UpdateParameters collection before adding the 
    // Parameter objects. Otherwise, there will be duplicate
    // parameters.
    AuthorsSqlDataSource.UpdateParameters.Clear();
    AuthorsSqlDataSource.UpdateParameters.Add(lastNameParameter);
    AuthorsSqlDataSource.UpdateParameters.Add(firstNameParameter);
    
  }
    
</script>

<head runat="server">
    <title>ButtonFieldBase CausesValidation Example</title>
</head>
<body>
  <form id="form1" runat="server">
  <div>

    <h3>ButtonFieldBase CausesValidation Example</h3>

    <!-- Populate the Columns collection declaratively. -->
    <asp:gridview id="AuthorsGridView" 
      datasourceid="AuthorsSqlDataSource"
      cellpadding="5"  
      autogeneratecolumns="false"
      datakeynames="au_id" 
      onrowcommand="AuthorsGridView_RowCommand"
      onrowupdating="AuthorsGridView_RowUpdating"  
      runat="server">

      <columns>
        <asp:buttonfield commandname="Edit"
          causesvalidation="false" 
          text="Edit" 
          headertext="Edit Author">
        </asp:buttonfield>

        <asp:buttonfield commandname="Update" 
          visible="false" 
          causesvalidation="true" 
          text="Update"
          validationgroup="NameGroup" 
          headertext="Update Author">
        </asp:buttonfield>

        <asp:templatefield headertext="Last Name">
          <itemtemplate>
            <%# Eval("au_lname") %>
          </itemtemplate>

          <edititemtemplate>
            <asp:textbox id="LastNameTextBox"
              text='<%# Eval("au_lname") %>'
              width="175" 
              runat="server" /><br />  

            <asp:RequiredFieldValidator ID="LastNameRequiredValidator"
              ControlToValidate="LastNameTextBox"
              ErrorMessage="Please enter a last name."
              ValidationGroup="NameGroup" 
              Runat="server" />

          </edititemtemplate>
        </asp:templatefield>

        <asp:templatefield headertext="First Name">
          <itemtemplate>
            <%# Eval("au_fname") %>
          </itemtemplate>

          <edititemtemplate>
            <asp:textbox id="FirstNameTextBox"
              text='<%# Eval("au_fname") %>'
              width="175" 
              runat="server" /><br />  

            <asp:RequiredFieldValidator ID="FirstNameRequiredValidator"
              ControlToValidate="FirstNameTextBox"
              ErrorMessage="Please enter a first name."
              ValidationGroup="NameGroup" 
              Runat="server" />

          </edititemtemplate>

        </asp:templatefield>
      </columns>

    </asp:gridview>

    <!-- This example uses Microsoft SQL Server and connects -->
    <!-- to the Pubs sample database.                        -->
    <asp:sqldatasource id="AuthorsSqlDataSource"  
      selectcommand="SELECT [au_id], [au_lname], [au_fname] FROM [authors]"
      updatecommand="UPDATE authors SET au_lname=@au_lname, au_fname=@au_fname WHERE (authors.au_id = @au_id)"
      connectionstring="server=localhost;database=pubs;integrated security=SSPI"
      runat="server">   
    </asp:sqldatasource>

  </div>
  </form>
</body>
</html>


<%@ Page language="VB" %>

<script runat="server">

  Sub AuthorsGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
  
    ' If multiple ButtonField columns are used, use the
    ' CommandName property to determine which button was clicked.
    Select Case e.CommandName
    
      Case "Edit"
        AuthorsGridView.Columns(0).Visible = False
        AuthorsGridView.Columns(1).Visible = True
      Case "Update"
        AuthorsGridView.Columns(0).Visible = True
        AuthorsGridView.Columns(1).Visible = False
      Case Else
        ' Do nothing.
   
    End Select
    
  End Sub
  
  Sub AuthorsGridView_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
    
    ' Retrieve the row being edited.    
    Dim index As Integer = AuthorsGridView.EditIndex
    Dim row As GridViewRow = AuthorsGridView.Rows(index)
    
    ' Retrieve the new value for the author's first name from the row. 
    ' In this example, the author's first name is in the second cell 
    ' of the row (index 1). To get the value, first retrieve the TextBox
    ' that contains the value.
    Dim firstNameTextBox As TextBox = CType(row.Cells(1).FindControl("FirstNameTextBox"), TextBox)
    
    ' Make sure the control was found. 
    Dim firstName As String = ""
    If Not firstNameTextBox Is Nothing Then

      firstName = firstNameTextBox.Text
      
    End If
    
    ' Retrieve the new value for the author's last name from the row. 
    ' In this example, the author's last name is in the third cell 
    ' of the row (index 2).
    Dim lastNameTextBox As TextBox = CType(row.Cells(2).FindControl("LastNameTextBox"), TextBox)
    
    Dim lastName As String = ""
    If Not lastNameTextBox Is Nothing Then
    
      lastName = lastNameTextBox.Text
      
    End If
    
    ' Because custom TemplateField field columns are used, parameters 
    ' are not automatically created and passed to the data source control.
    ' Create Parameter objects to represent the fields to update and 
    ' add the Parameter objects to the UpdateParameters collection.
    Dim lastNameParameter As New Parameter("au_lname", TypeCode.String, lastName)
    Dim firstNameParameter As New Parameter("au_fname", TypeCode.String, firstName)
    
    ' Clear the UpdateParameters collection before adding the 
    ' Parameter objects. Otherwise, there will be duplicate
    ' parameters.
    AuthorsSqlDataSource.UpdateParameters.Clear()
    AuthorsSqlDataSource.UpdateParameters.Add(lastNameParameter)
    AuthorsSqlDataSource.UpdateParameters.Add(firstNameParameter)
    
  End Sub
    
</script>

<head runat="server">
    <title>ButtonFieldBase CausesValidation Example</title>
</head>
<body>
  <form id="form1" runat="server">
  <div>

    <h3>ButtonFieldBase CausesValidation Example</h3>

    <!-- Populate the Columns collection declaratively. -->
    <asp:gridview id="AuthorsGridView" 
      datasourceid="AuthorsSqlDataSource"
      cellpadding="5"  
      autogeneratecolumns="false"
      datakeynames="au_id" 
      onrowcommand="AuthorsGridView_RowCommand"
      onrowupdating="AuthorsGridView_RowUpdating"  
      runat="server">

      <columns>
        <asp:buttonfield commandname="Edit"
          causesvalidation="false" 
          text="Edit" 
          headertext="Edit Author">
        </asp:buttonfield>

        <asp:buttonfield commandname="Update" 
          visible="false" 
          causesvalidation="true" 
          text="Update"
          validationgroup="NameGroup" 
          headertext="Update Author">
        </asp:buttonfield>

        <asp:templatefield headertext="Last Name">
          <itemtemplate>
            <%# Eval("au_lname") %>
          </itemtemplate>

          <edititemtemplate>
            <asp:textbox id="LastNameTextBox"
              text='<%# Eval("au_lname") %>'
              width="175" 
              runat="server" /><br />  

            <asp:RequiredFieldValidator ID="LastNameRequiredValidator"
              ControlToValidate="LastNameTextBox"
              ErrorMessage="Please enter a last name."
              ValidationGroup="NameGroup" 
              Runat="server" />

          </edititemtemplate>
        </asp:templatefield>

        <asp:templatefield headertext="First Name">
          <itemtemplate>
            <%# Eval("au_fname") %>
          </itemtemplate>

          <edititemtemplate>
            <asp:textbox id="FirstNameTextBox"
              text='<%# Eval("au_fname") %>'
              width="175" 
              runat="server" /><br />  

            <asp:RequiredFieldValidator ID="FirstNameRequiredValidator"
              ControlToValidate="FirstNameTextBox"
              ErrorMessage="Please enter a first name."
              ValidationGroup="NameGroup" 
              Runat="server" />

          </edititemtemplate>

        </asp:templatefield>
      </columns>

    </asp:gridview>

    <!-- This example uses Microsoft SQL Server and connects -->
    <!-- to the Pubs sample database.                        -->
    <asp:sqldatasource id="AuthorsSqlDataSource"  
      selectcommand="SELECT [au_id], [au_lname], [au_fname] FROM [authors]"
      updatecommand="UPDATE authors SET au_lname=@au_lname, au_fname=@au_fname WHERE (authors.au_id = @au_id)"
      connectionstring="server=localhost;database=pubs;integrated security=SSPI"
      runat="server">   
    </asp:sqldatasource>

  </div>
  </form>
</body>
</html>

Poznámky

Skupiny ověření umožňují přiřadit ověřovací ovládací prvky na stránce ke konkrétní kategorii. Každou ověřovací skupinu je možné ověřit nezávisle na jiných ověřovacích skupinách na stránce. ValidationGroup Pomocí vlastnosti zadejte název ověřovací skupiny, pro kterou ButtonFieldBase objekt způsobí ověření, když odešle příspěvek zpět na server.

Vlastnost ValidationGroup má účinek pouze v případech, kdy je hodnota vlastnosti nastavena CausesValidation na truehodnotu . Pokud zadáte hodnotu ValidationGroup vlastnosti, ověřují ButtonFieldBase se při odeslání zpět na server pouze ověřovací ovládací prvky, které jsou součástí zadané skupiny. Pokud nezadáte hodnotu ValidationGroup vlastnosti a CausesValidation vlastnost je nastavena na true, všechny ověřovací ovládací prvky na stránce, které nejsou přiřazeny ověřovací skupině, se ověří při ButtonFieldBase odeslání zpět na server.

Hodnota této vlastnosti je uložena ve stavu zobrazení.

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