GridView.DataBind Yöntem

Tanım

Veri kaynağını denetime GridView bağlar. Bu yöntem devralınamaz.

public:
 override void DataBind();
public override sealed void DataBind ();
override this.DataBind : unit -> unit
Public Overrides NotOverridable Sub DataBind ()

Örnekler

Aşağıdaki örnekte, bir veri kaynağını GridView bir denetime bağlamak için yönteminin nasıl kullanılacağı DataBind() gösterilmektedir.


<%@ Page language="C#" %>
<%@ import namespace="System.Data" %>
<%@ import namespace="System.Data.SqlClient" %>

<!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)
  {
    
    // This example uses Microsoft SQL Server and connects
    // to the Northwind sample database. The data source needs
    // to be bound to the GridView control only when the 
    // page is first loaded. Thereafter, the values are
    // stored in view state.                      
    if(!IsPostBack)
    {
        
      // Declare the query string.
      String queryString = 
        "Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]";
        
      // Run the query and bind the resulting DataSet
      // to the GridView control.
      DataSet ds = GetData(queryString);
      if (ds.Tables.Count > 0)
      {
        AuthorsGridView.DataSource = ds;
        AuthorsGridView.DataBind();
      }
      else
      {
        Message.Text = "Unable to connect to the database.";
      }
            
    }     
    
  }
    
  DataSet GetData(String queryString)
  {

    // Retrieve the connection string stored in the Web.config file.
    String connectionString = ConfigurationManager.ConnectionStrings["NorthWindConnectionString"].ConnectionString;      
 
    DataSet ds = new DataSet();
        
    try
    {
      // Connect to the database and run the query.
      SqlConnection connection = new SqlConnection(connectionString);        
      SqlDataAdapter adapter = new SqlDataAdapter(queryString, connection);
        
      // Fill the DataSet.
      adapter.Fill(ds);
            
    }
    catch(Exception ex)
    {
        
      // The connection failed. Display an error message.
      Message.Text = "Unable to connect to the database.";
        
    }
        
    return ds;
        
  }
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView DataBind Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView DataBind Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
               
      <br/>    

      <asp:gridview id="AuthorsGridView" 
        autogeneratecolumns="true" 
        runat="server">
      </asp:gridview>
                        
    </form>
  </body>
</html>

<%@ Page language="VB" %>
<%@ import namespace="System.Data" %>
<%@ import namespace="System.Data.SqlClient" %>

<!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)
    
    ' This example uses Microsoft SQL Server and connects
    ' to the Northwind sample database. The data source needs
    ' to be bound to the GridView control only when the 
    ' page is first loaded. Thereafter, the values are
    ' stored in view state.                      
    If Not IsPostBack Then
        
      ' Declare the query string.
      Dim queryString As String = _
        "Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        
      ' Run the query and bind the resulting DataSet
      ' to the GridView control.
      Dim ds As DataSet = GetData(queryString)
      If (ds.Tables.Count > 0) Then
      
        AuthorsGridView.DataSource = ds
        AuthorsGridView.DataBind()
      
      Else
      
        Message.Text = "Unable to connect to the database."
        
      End If
            
    End If
    
  End Sub
    
  Function GetData(ByVal queryString As String) As DataSet
    
    ' Retrieve the connection string stored in the Web.config file.
    Dim connectionString As String = ConfigurationManager.ConnectionStrings("NorthWindConnectionString").ConnectionString
 
    Dim ds As New DataSet()
        
    Try

      ' Connect to the database and run the query.
      Dim connection As New SqlConnection(connectionString)
      Dim adapter As New SqlDataAdapter(queryString, Connection)
        
      ' Fill the DataSet.
      Adapter.Fill(ds)
            
    
    Catch ex As Exception
        
      ' The connection failed. Display an error message.
      Message.Text = "Unable to connect to the database."
        
    End Try
        
    Return ds
        
  End Function
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView DataBind Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView DataBind Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
               
      <br/>    

      <asp:gridview id="AuthorsGridView" 
        autogeneratecolumns="true" 
        runat="server">
      </asp:gridview>
                        
    </form>
  </body>
</html>

Açıklamalar

DataBind() Bir veri kaynağındaki verileri denetime bağlamak için GridView yöntemini kullanın. Bu yöntem, denetimin etkin şablonundaki tüm veri bağlama ifadelerini çözümler.

Denetimin DataBind özelliği GridView geçerli bir veri kaynağı denetimine başvuruyorsa DataSourceID yöntemi otomatik olarak çağrılır.

yöntemini el ile çağırmak DataBind yerine, özelliğini için veri döndüren bir yöntemin adına ayarlayarak SelectMethod denetiminizle DataBind model bağlamayı GridViewkullanabilirsiniz. GridView Daha sonra, select yönteminden döndürülen verilerle otomatik olarak doldurulur. Model bağlama, verilerle çalışmak için kodunuzu basitleştirebilir. Daha fazla bilgi için bkz. Model Bağlama ve Web Forms.

Şunlara uygulanır

Ayrıca bkz.