DataKey.Item[] Eigenschaft

Definition

Ruft den Wert eines Schlüsselfelds aus einem DataKey Objekt ab.

Überlädt

Name Beschreibung
Item[Int32]

Ruft den Wert des Schlüsselfelds am angegebenen Index aus einem DataKey Objekt ab.

Item[String]

Ruft den Wert des Schlüsselfelds mit dem angegebenen Feldnamen aus einem DataKey Objekt ab.

Item[Int32]

Ruft den Wert des Schlüsselfelds am angegebenen Index aus einem DataKey Objekt ab.

public:
 virtual property System::Object ^ default[int] { System::Object ^ get(int index); };
public virtual object this[int index] { get; }
member this.Item(int) : obj
Default Public Overridable ReadOnly Property Item(index As Integer) As Object

Parameter

index
Int32

Der nullbasierte Index, bei dem der Schlüsselfeldwert abgerufen werden soll.

Eigenschaftswert

Der Wert des Schlüsselfelds am angegebenen Index.

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die Item[Int32] Eigenschaft verwendet wird, um einen Schlüsselfeldwert aus einem bestimmten Index in einem DataKey Objekt abzurufen.


<%@ 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 CustomerDetailsView_DataBound(Object sender, EventArgs e)
  {

    // Get the value of the key field at index 2 in the DataKey object.
    String value = CustomerDetailsView.DataKey[2].ToString();

    // Display the value of the key field.
    MessageLabel.Text = "The value of the PostalCode key field is " + value +
      ".";

  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DataKey Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DataKey Example</h3>
                       
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          datakeynames="CustomerID, CompanyName, PostalCode"  
          allowpaging="true"
          ondatabound="CustomerDetailsView_DataBound" 
          runat="server">
            
        </asp:detailsview>
        
        <br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- 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"
          selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

<%@ Page language="VB" autoeventwireup="false" %>

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

  Sub CustomerDetailsView_DataBound(ByVal sender As Object, ByVal e As EventArgs) Handles CustomerDetailsView.DataBound

    ' Get the value of the key field at index 2 in the DataKey object.
    Dim value As String = CustomerDetailsView.DataKey(2).ToString()

    ' Display the value of the key field.
    MessageLabel.Text = "The value of the PostalCode key field is " & value & _
      "."

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DataKey Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DataKey Example</h3>
                       
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          datakeynames="CustomerID, CompanyName, PostalCode"  
          allowpaging="true"
          runat="server">
            
        </asp:detailsview>
        
        <br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- 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"
          selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

Hinweise

Verwenden Sie die Item[Int32] Eigenschaft, um den Wert des Schlüsselfelds am angegebenen Index im DataKey Objekt abzurufen.

Note

Alternativ können Sie auch die Item[String] Eigenschaft verwenden, um einen Schlüsselfeldwert nach Feldname abzurufen.

Weitere Informationen

Gilt für:

Item[String]

Ruft den Wert des Schlüsselfelds mit dem angegebenen Feldnamen aus einem DataKey Objekt ab.

public:
 virtual property System::Object ^ default[System::String ^] { System::Object ^ get(System::String ^ name); };
public virtual object this[string name] { get; }
member this.Item(string) : obj
Default Public Overridable ReadOnly Property Item(name As String) As Object

Parameter

name
String

Der Name des Schlüsselfelds, für das der Schlüsselfeldwert abgerufen werden soll.

Eigenschaftswert

Der Wert des Schlüsselfelds mit dem angegebenen Feldnamen.

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die Item[String] Eigenschaft verwendet wird, um einen Schlüsselfeldwert aus einem bestimmten Index in einem DataKey Objekt abzurufen.


<%@ 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 CustomerDetailsView_DataBound(Object sender, EventArgs e)
  {

    // Get the value of the PostalCode key field.
    String value = CustomerDetailsView.DataKey["PostalCode"].ToString();

    // Display the value of the key field.
    MessageLabel.Text = "The value of the PostalCode key field is " + value +
      ".";

  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DataKey Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        
      <h3>DataKey Example</h3>
                       
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          datakeynames="CustomerID, CompanyName, PostalCode"  
          allowpaging="true"
          ondatabound="CustomerDetailsView_DataBound" 
          runat="server">
            
        </asp:detailsview>
        
        <br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- 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"
          selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

<%@ Page language="VB" autoeventwireup="false" %>

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

  Sub CustomerDetailsView_DataBound(ByVal sender As Object, ByVal e As EventArgs) Handles CustomerDetailsView.DataBound

    ' Get the value of the PostalCode key field.
    Dim value As String = CustomerDetailsView.DataKey("PostalCode").ToString()

    ' Display the value of the key field.
    MessageLabel.Text = "The value of the PostalCode key field is " & value & _
      "."

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DataKey Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DataKey Example</h3>
                       
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          datakeynames="CustomerID, CompanyName, PostalCode"  
          allowpaging="true"
          runat="server">
            
        </asp:detailsview>
        
        <br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- 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"
          selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

Hinweise

Verwenden Sie die Item[String] Eigenschaft, um den Wert des angegebenen Schlüsselfelds aus dem DataKey Objekt abzurufen.

Note

Alternativ können Sie auch die Item[Int32] Eigenschaft verwenden, um einen Schlüsselfeldwert nach Index abzurufen.

Weitere Informationen

Gilt für: