GridViewRow.DataItem Özellik

Başvuru

Tanım

Ad Alanı:: System.Web.UI.WebControls

Bütünleştirilmiş Kod:: System.Web.dll

Önemli

Bazı bilgiler ürünün ön sürümüyle ilgilidir ve sürüm öncesinde önemli değişiklikler yapılmış olabilir. Burada verilen bilgilerle ilgili olarak Microsoft açık veya zımni hiçbir garanti vermez.

Nesnenin bağlı olduğu GridViewRow temel veri nesnesini alır.

public:
 virtual property System::Object ^ DataItem { System::Object ^ get(); void set(System::Object ^ value); };

public virtual object DataItem { get; set; }

member this.DataItem : obj with get, set

Public Overridable Property DataItem As Object

Özellik Değeri

Object

Object Nesnenin bağlı olduğu temel veri nesnesini temsil eden GridViewRow bir.

Örnekler

Aşağıdaki örnekte, bir alan değerini almak için özelliğinin DataItem nasıl kullanılacağı gösterilmektedir. Daha sonra değer, bir satır düzenleme modundayken görüntülenen denetimdeki DropDownList bir öğeyi önceden seçmek için kullanılır.


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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  void AuthorsGridView_RowDataBound (Object sender, GridViewRowEventArgs e)
  {
    // Check for a row in edit mode.
    if(e.Row.RowState == DataControlRowState.Edit)
    {
      // Preselect the DropDownList control with the state value
      // for the current row.
      
      // Retrieve the underlying data item. In this example
      // the underlying data item is a DataRowView object. 
      DataRowView rowView = (DataRowView)e.Row.DataItem;
      
      // Retrieve the state value for the current row. 
      String state = rowView["state"].ToString();
      
      // Retrieve the DropDownList control from the current row. 
      DropDownList list = (DropDownList)e.Row.FindControl("StatesList");
      
      // Find the ListItem object in the DropDownList control with the 
      // state value and select the item.
      ListItem item = list.Items.FindByText(state);
      list.SelectedIndex = list.Items.IndexOf(item);
    }
  }
  
  void AuthorsGridView_RowUpdating(Object sender, GridViewUpdateEventArgs e)
  {
    // Retrieve the row being edited.
    GridViewRow row = AuthorsGridView.Rows[AuthorsGridView.EditIndex];
    
    // Retrieve the DropDownList control from the row.
    DropDownList list = (DropDownList)row.FindControl("StatesList");
    
    // Add the selected value of the DropDownList control to 
    // the NewValues collection. The NewValues collection is
    // passed to the data source control, which then updates the 
    // data source.
    e.NewValues["state"] = list.SelectedValue;
  }
  
</script>

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

      <asp:gridview id="AuthorsGridView" 
        datasourceid="AuthorsSqlDataSource" 
        autogeneratecolumns="false"
        autogenerateeditbutton="true" 
        datakeynames="au_id"
        onrowdatabound="AuthorsGridView_RowDataBound"
        onrowupdating="AuthorsGridView_RowUpdating"   
        runat="server"> 
               
        <columns>
          <asp:boundfield datafield="au_lname"
            headertext="Last Name"/>
          <asp:boundfield datafield="au_fname"
            headertext="First Name"/>
          <asp:templatefield headertext="State">
            <itemtemplate>
              <%#Eval("state")%>
            </itemtemplate>
            <edititemtemplate>
              <asp:dropdownlist id="StatesList"
                datasourceid="StatesSqlDataSource"
                datatextfield="state"  
                runat="server"/>  
              <asp:sqldatasource id="StatesSqlDataSource"  
                selectcommand="SELECT Distinct [state] FROM [authors]"
                connectionstring="server=localhost;database=pubs;integrated security=SSPI"
                runat="server">
              </asp:sqldatasource>
            </edititemtemplate>            
          </asp:templatefield>
        </columns>
                              
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="AuthorsSqlDataSource"  
        selectcommand="SELECT [au_id], [au_lname], [au_fname], [state] FROM [authors]"
        updatecommand="UPDATE authors SET [au_lname]=@au_lname, [au_fname]=@au_fname, [state]=@state WHERE au_id=@au_id"
        connectionstring="server=localhost;database=pubs;integrated security=SSPI"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>


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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  Sub AuthorsGridView_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

    ' Check for a row in edit mode.
    If e.Row.RowState = DataControlRowState.Edit Then
    
      ' Preselect the DropDownList control with the state value
      ' for the current row.
      
      ' Retrieve the underlying data item. In this example
      ' the underlying data item is a DataRowView object. 
      Dim rowView As DataRowView = CType(e.Row.DataItem, DataRowView)
      
      ' Retrieve the state value for the current row. 
      Dim state As String = rowView("state").ToString()
      
      ' Retrieve the DropDownList control from the current row. 
      Dim list As DropDownList = CType(e.Row.FindControl("StatesList"), DropDownList)
      
      ' Find the ListItem object in the DropDownList control with the 
      ' state value and select the item.
      Dim item As ListItem = list.Items.FindByText(state)
      list.SelectedIndex = list.Items.IndexOf(item)
      
    End If
    
  End Sub
  
  Sub AuthorsGridView_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)

    ' Retrieve the row being edited.
    Dim row As GridViewRow = AuthorsGridView.Rows(AuthorsGridView.EditIndex)
    
    ' Retrieve the DropDownList control from the row.
    Dim list As DropDownList = CType(row.FindControl("StatesList"), DropDownList)
    
    ' Add the selected value of the DropDownList control to 
    ' the NewValues collection. The NewValues collection is
    ' passed to the data source control, which then updates the 
    ' data source.
    e.NewValues("state") = list.SelectedValue
  
  End Sub
  
</script>

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

      <asp:gridview id="AuthorsGridView" 
        datasourceid="AuthorsSqlDataSource" 
        autogeneratecolumns="false"
        autogenerateeditbutton="true" 
        datakeynames="au_id"
        onrowdatabound="AuthorsGridView_RowDataBound"
        onrowupdating="AuthorsGridView_RowUpdating"   
        runat="server"> 
               
        <columns>
          <asp:boundfield datafield="au_lname"
            headertext="Last Name"/>
          <asp:boundfield datafield="au_fname"
            headertext="First Name"/>
          <asp:templatefield headertext="State">
            <itemtemplate>
              <%#Eval("state")%>
            </itemtemplate>
            <edititemtemplate>
              <asp:dropdownlist id="StatesList"
                datasourceid="StatesSqlDataSource"
                datatextfield="state"  
                runat="server"/>  
              <asp:sqldatasource id="StatesSqlDataSource"  
                selectcommand="SELECT Distinct [state] FROM [authors]"
                connectionstring="server=localhost;database=pubs;integrated security=SSPI"
                runat="server">
              </asp:sqldatasource>
            </edititemtemplate>            
          </asp:templatefield>
        </columns>
                              
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="AuthorsSqlDataSource"  
        selectcommand="SELECT [au_id], [au_lname], [au_fname], [state] FROM [authors]"
        updatecommand="UPDATE authors SET [au_lname]=@au_lname, [au_fname]=@au_fname, [state]=@state WHERE au_id=@au_id"
        connectionstring="server=localhost;database=pubs;integrated security=SSPI"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Açıklamalar

nesnesinin DataItem bağlı olduğu GridViewRow temel veri nesnesinin özelliklerine erişmek için özelliğini kullanın. DataItem özelliği yalnızca bir GridView denetimin RowDataBound olayı sırasında ve sonrasında kullanılabilir.

Not

Bu özellik yalnızca veri satırları için geçerlidir.

Şunlara uygulanır

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