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DataKeyArray.GetEnumerator 메서드

정의

컬렉션의 모든 DataKey 개체를 포함하는 열거자를 반환합니다.

public:
 virtual System::Collections::IEnumerator ^ GetEnumerator();
public System.Collections.IEnumerator GetEnumerator ();
abstract member GetEnumerator : unit -> System.Collections.IEnumerator
override this.GetEnumerator : unit -> System.Collections.IEnumerator
Public Function GetEnumerator () As IEnumerator

반환

IEnumerator

컬렉션의 모든 IEnumerator 개체를 포함하는 DataKey 구현 개체입니다.

구현

예제

다음 코드 예제에서 만든 열거자를 반복 하는 방법에 설명 합니다 GetEnumerator 메서드.


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

    // Use the Count property to determine whether the
    // DataKeys collection contains any items.
    if (CustomerGridView.DataKeys.Count > 0)
    {

      MessageLabel.Text = "The primary key of each record displayed are: <br/><br/>";

      // Use the GetEnumerator method to create an enumerator that 
      // contains the DataKey objects for the GridView control.
      IEnumerator keyEnumerator = CustomerGridView.DataKeys.GetEnumerator();

      // Iterate though the enumerator and display the primary key
      // value of each record displayed.
      while (keyEnumerator.MoveNext())
      {
        DataKey key = (DataKey)keyEnumerator.Current;
        MessageLabel.Text += key.Value.ToString() + "<br/>";
      }

    }
    else
    {
      MessageLabel.Text = "No DataKey objects.";
    }

  }
  
</script>

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

  <head runat="server">
    <title>DataKeyArray Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DataKeyArray Example</h3>
                       
        <asp:gridview id="CustomerGridView"
          datasourceid="CustomerDataSource"
          autogeneratecolumns="true"
          datakeynames="CustomerID"  
          allowpaging="true"
          ondatabound="CustomerGridView_DataBound" 
          runat="server">
            
        </asp:gridview>
        
        <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="CustomerDataSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </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 CustomerGridView_DataBound(ByVal sender As Object, ByVal e As EventArgs) Handles CustomerGridView.DataBound

    ' Use the Count property to determine whether the
    ' DataKeys collection contains any items.
    If CustomerGridView.DataKeys.Count > 0 Then

      MessageLabel.Text = "The primary key of each record displayed are: <br/><br/>"

      ' Use the GetEnumerator method to create an enumerator that 
      ' contains the DataKey objects for the GridView control.
      Dim keyEnumerator As IEnumerator = CustomerGridView.DataKeys.GetEnumerator()

      ' Iterate though the enumerator and display the primary key
      ' value of each record displayed.
      While keyEnumerator.MoveNext()
      
        Dim key As DataKey = CType(keyEnumerator.Current, DataKey)
        MessageLabel.Text &= key.Value.ToString() & "<br/>"
      
      End While

    Else
    
      MessageLabel.Text = "No DataKey objects."
    
    End If

  End Sub
  
</script>

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

  <head runat="server">
    <title>DataKeyArray Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DataKeyArray Example</h3>
                       
        <asp:gridview id="CustomerGridView"
          datasourceid="CustomerDataSource"
          autogeneratecolumns="true"
          datakeynames="CustomerID"  
          allowpaging="true"
          runat="server">
            
        </asp:gridview>
        
        <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="CustomerDataSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

설명

사용 하 여는 GetEnumerator 메서드를 컬렉션의 각 항목에 액세스 하려면 선형적으로 반복할 수 있는 열거자를 가져옵니다. 열거자의 현재 위치에 있는 항목에 액세스 하려면 사용 된 IEnumerator.Current 속성입니다. 사용 된 IEnumerator.MoveNext 컬렉션의 다음 항목으로 이동 하는 방법입니다. 열거자를 초기 위치로 이동 하려면 사용 된 IEnumerator.Reset 메서드.

참고

처음에 열거자를 가져옵니다. 하거나 때 사용 합니다 IEnumerator.Reset 열거자는 컬렉션의 첫 번째 항목으로 이동 하는 방법 호출 해야 합니다는 IEnumerator.MoveNext 메서드. 항목을 표시 하는 고, 그렇지는 IEnumerator.Current 속성 정의 되지 않습니다.

적용 대상

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