BoundField 생성자

정의

네임스페이스:
System.Web.UI.WebControls
어셈블리:
System.Web.dll

BoundField 클래스의 새 인스턴스를 초기화합니다.

public:
 BoundField();
public BoundField();
Public Sub New ()

예제

다음 코드 예제에서는 동적으로 컨트롤에 개체를 추가 BoundField 하는 생성자를 사용 하는 GridView 방법을 보여 줍니다.


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

    // Dynamically generated field columns need to be created only 
    // the first time the page is loaded.
    if(!IsPostBack)  
    {
      // Dynamically create field columns to display the desired
      // fields from the data source.
  
      // Create a BoundField object to display a customer's company name.
      BoundField nameBoundField = new BoundField();
      nameBoundField.DataField = "CompanyName";
      nameBoundField.HeaderText = "Company Name";
    
      // Create a BoundField object to display a customer's city.
      BoundField cityBoundField = new BoundField();
      cityBoundField.DataField = "City";
      cityBoundField.HeaderText = "City";
    
      // Add the field columns to the ColumnFields collection of the
      // GridView control.
      CustomersGridView.Columns.Add(nameBoundField);
      CustomersGridView.Columns.Add(cityBoundField);
    }
  
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>BoundField Constructor Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>BoundField Constructor Example</h3>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="false"
        runat="server">                
      </asp:gridview>
            
      <!-- 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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    ' Dynamically generated field columns need to be created only 
    ' the first time the page is loaded.
    If Not IsPostBack Then
    
      ' Dynamically create field columns to display the desired
      ' fields from the data source.
  
      ' Create a BoundField object to display a customer's company name.
      Dim nameBoundField As New BoundField()
      nameBoundField.DataField = "CompanyName"
      nameBoundField.HeaderText = "Company Name"
    
      ' Create a BoundField object to display a customer's city.
      Dim cityBoundField As New BoundField()
      cityBoundField.DataField = "City"
      cityBoundField.HeaderText = "City"
    
      ' Add the field columns to the ColumnFields collection of the
      ' GridView control.
      CustomersGridView.Columns.Add(nameBoundField)
      CustomersGridView.Columns.Add(cityBoundField)
    
    End If
  
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>BoundField Constructor Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>BoundField Constructor Example</h3>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="false"
        runat="server">                
      </asp:gridview>
            
      <!-- 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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

설명

이 생성자를 사용하여 클래스의 새 인스턴스를 초기화합니다 BoundField . 이 생성자는 동적으로 만들어진 데이터 바인딩된 컨트롤에 필드를 추가할 때 일반적으로 사용됩니다.

데이터 바인딩된 컨트롤에 개체를 BoundField 동적으로 추가하려면 새 BoundField 개체를 만들고 해당 속성을 설정한 다음 데이터 바인딩된 컨트롤의 필드 컬렉션에 추가합니다. 예를 들어 컨트롤을 GridView 사용하는 경우 컬렉션에 BoundField 개체를 추가합니다 Columns .

메모

데이터 바인딩된 컨트롤에 필드를 동적으로 추가할 수 있지만 필드를 적절하게 정적으로 선언한 다음 표시하거나 숨기는 것이 좋습니다. 모든 필드를 정적으로 선언하면 부모 데이터 바인딩된 컨트롤의 뷰 상태 크기가 줄어듭니다.

적용 대상

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