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DetailsView.DataKey Свойство

Определение

Пространство имен:
System.Web.UI.WebControls
Сборка:
System.Web.dll

DataKey Возвращает объект, представляющий первичный ключ отображаемой записи.

public:
 virtual property System::Web::UI::WebControls::DataKey ^ DataKey { System::Web::UI::WebControls::DataKey ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.DataKey DataKey { get; }
[<System.ComponentModel.Browsable(false)>]
member this.DataKey : System.Web.UI.WebControls.DataKey
Public Overridable ReadOnly Property DataKey As DataKey

Значение свойства

DataKey

Объект, DataKey представляющий первичный ключ отображаемой записи.

Атрибуты
BrowsableAttribute

Примеры

В следующем примере кода показано, как использовать DataKey свойство для определения ключевого поля и соответствующего значения текущей записи.


<%@ 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 CustomerDetailView_ItemUpdated(Object sender, 
    DetailsViewUpdatedEventArgs e)
  {
  
    // Create a dictionary that contains the key fields and values using
    // the AllValues method of the DataKey object contained in the DataKey 
    // property.
    IOrderedDictionary keyList = CustomerDetailView.DataKey.Values;

    // Get the ArrayList objects that represent the key fields and values.
    ArrayList keys = (ArrayList)keyList.Keys;
    ArrayList values = (ArrayList)keyList.Values;

    // Get the key field and value for the current record. 
    String keyField = keys[0].ToString();
    String keyValue = values[0].ToString();
    
    // Log the update operation using the key field and value.
    LogUpdate(keyField, keyValue);

  }

  void LogUpdate(String keyField, String keyValue)
  {
    // Insert code to log the update operation.
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsView DataKey Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        
      <h3>DetailsView DataKey Example</h3>
                
        <asp:detailsview id="CustomerDetailView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogeneraterows="true"
          autogenerateeditbutton="true" 
          allowpaging="true"
          onitemupdated="CustomerDetailView_ItemUpdated" 
          runat="server">
               
          <headerstyle backcolor="Navy"
            forecolor="White"/>
                    
        </asp:detailsview>
        
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:SqlDataSource ID="DetailsViewSource" runat="server" 
          ConnectionString=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
                    InsertCommand="INSERT INTO [Customers]([CustomerID], 
            [CompanyName], [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, 
            @PostalCode, @Country)"
          SelectCommand="Select [CustomerID], [CompanyName], 
            [Address], [City], [PostalCode], [Country] From [Customers]"
          UpdateCommand="UPDATE [Customers] SET 
            [CompanyName] = @CompanyName, 
            [Address] = @Address, [City] = @City,
            [PostalCode] = @PostalCode, [Country] = @Country
            WHERE [CustomerID] = @CustomerID">
        </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 CustomerDetailView_ItemUpdated(ByVal sender As Object, _
        ByVal e As DetailsViewUpdatedEventArgs)
    
        ' Create a dictionary that contains the key fields and values 
        ' using the AllValues method of the DataKey object contained 
        ' in the DataKey property.
        
        Dim keyList As IOrderedDictionary = _
            CustomerDetailsView.DataKey.Values

        ' Get the ArrayList objects that represent the key fields 
        ' and values.
        Dim keys As ArrayList = CType(keyList.Keys, ArrayList)
        Dim values As ArrayList = CType(keyList.Values, ArrayList)

        ' Get the key field and value for the current record. 
        Dim keyField As String = keys(0).ToString()
        Dim keyValue As String = values(0).ToString()
    
        ' Log the update operation using the key field and value.
        LogUpdate(keyField, keyValue)

    End Sub

    Sub LogUpdate(ByVal keyField As String, ByVal keyValue As String)
  
        ' Insert code to log the update operation.
  
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView DataKey Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView DataKey Example</h3>
        <asp:DetailsView ID="CustomerDetailsView" 
          DataSourceID="DetailsViewSource" 
          DataKeyNames="CustomerID"
          AutoGenerateRows="true" 
          AutoGenerateEditButton="true" 
          AllowPaging="true" 
          OnItemUpdated="CustomerDetailView_ItemUpdated"
          runat="server">
          
          <HeaderStyle BackColor="Navy" ForeColor="White" />
        </asp:DetailsView>

        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:SqlDataSource ID="DetailsViewSource" runat="server" 
          ConnectionString=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
          InsertCommand="INSERT INTO [Customers]([CustomerID],
            [CompanyName], [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, 
            @PostalCode, @Country)"
            SelectCommand="Select [CustomerID], [CompanyName], 
              [Address], [City], [PostalCode], [Country] 
              From [Customers]"
            UpdateCommand="UPDATE [Customers] SET [CompanyName] = @CompanyName, 
            [Address] = @Address, [City] = @City,
            [PostalCode] = @PostalCode, [Country] = @Country
            WHERE [CustomerID] = @CustomerID"></asp:SqlDataSource>
    </form>
</body>
</html>

Комментарии

DataKeyNames При установке DetailsView свойства элемент управления автоматически создает DataKey объект, представляющий ключевое поле или поля текущей записи. DataKey Используйте свойство для получения этого DataKey объекта. Это свойство обычно используется для получения ключей и их соответствующих значений для полей, указанных в свойстве DataKeyNames .

Замечание

В качестве ярлыка можно также использовать SelectedValue свойство для определения значения первого поля ключа, указанного в свойстве DataKeyNames .

Применяется к

См. также раздел