DetailsViewInsertEventHandler Temsilci

Tanım

Ad Alanı:: System.Web.UI.WebControls

Bütünleştirilmiş Kod:: System.Web.dll

Önemli

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Bir denetimin olayını ItemInserting işleyen DetailsView yöntemi temsil eder.

public delegate void DetailsViewInsertEventHandler(System::Object ^ sender, DetailsViewInsertEventArgs ^ e);

public delegate void DetailsViewInsertEventHandler(object sender, DetailsViewInsertEventArgs e);

type DetailsViewInsertEventHandler = delegate of obj * DetailsViewInsertEventArgs -> unit

Public Delegate Sub DetailsViewInsertEventHandler(sender As Object, e As DetailsViewInsertEventArgs)

Parametreler

sender: Object

Olayın kaynağı.

e: DetailsViewInsertEventArgs

DetailsViewInsertEventArgs Olay verilerini içeren bir.

Örnekler

Aşağıdaki kod örneği, bir denetimin olayına DetailsViewInsertEventHandler program aracılığıyla temsilci ItemInserting DetailsView eklemeyi gösterir.


<%@ 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)
  {

    // Create a new DetailsView object.
    DetailsView customerDetailsView = new DetailsView();

    // Set the DetailsView object's properties.
    customerDetailsView.ID = "CustomerDetailsView";
    customerDetailsView.DataSourceID = "DetailsViewSource";
    customerDetailsView.AutoGenerateRows = true;
    customerDetailsView.AutoGenerateInsertButton = true;
    customerDetailsView.AllowPaging = true;
    customerDetailsView.DataKeyNames = new String[1] { "CustomerID" };
    
    // Programmatically register the event-handling method
    // for the ItemInserted event of a DetailsView control.
    customerDetailsView.ItemInserting += new DetailsViewInsertEventHandler(this.CustomerDetailsView_ItemInserting);

    // Add the DetailsView object to the Controls collection
    // of the PlaceHolder control.
    DetailsViewPlaceHolder.Controls.Add(customerDetailsView);

  }

  void CustomerDetailsView_ItemInserting(Object sender, DetailsViewInsertEventArgs e)
  {
    // Use the Values property to retrieve the key field value.
    String keyValue = e.Values["CustomerID"].ToString();

    // Insert the record only if the key field is four characters
    // long; otherwise, cancel the insert operation.
    if (keyValue.Length == 4)
    {
      // Change the key field value to upper case before inserting 
      // the record in the data source.
      e.Values["CustomerID"] = keyValue.ToUpper();

      MessageLabel.Text = "";
    }
    else
    {
      MessageLabel.Text = "The key field must have four digits.";
      e.Cancel = true;
    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewInsertEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewInsertEventHandler Example</h3>
        
      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated DetailsView control.         -->       
      <asp:PlaceHolder id="DetailsViewPlaceHolder"
        runat="server"/>
        
      <br/><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]"
        insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
        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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    ' Create a new DetailsView object.
    Dim customerDetailsView As New DetailsView()

    ' Set the DetailsView object's properties.
    customerDetailsView.ID = "CustomerDetailsView"
    customerDetailsView.DataSourceID = "DetailsViewSource"
    customerDetailsView.AutoGenerateRows = True
    customerDetailsView.AutoGenerateInsertButton = True
    customerDetailsView.AllowPaging = True
    
    Dim keyArray() As String = {"CustomerID"}
    customerDetailsView.DataKeyNames = keyArray
    
    ' Programmatically register the event-handling method
    ' for the ItemInserted event of a DetailsView control.
    AddHandler customerDetailsView.ItemInserting, AddressOf CustomerDetailsView_ItemInserting

    ' Add the DetailsView object to the Controls collection
    ' of the PlaceHolder control.
    DetailsViewPlaceHolder.Controls.Add(customerDetailsView)

  End Sub

  Sub CustomerDetailsView_ItemInserting(ByVal sender As Object, ByVal e As DetailsViewInsertEventArgs)
    
    ' Use the Values property to retrieve the key field value.
    Dim keyValue As String = e.Values("CustomerID").ToString()

    ' Insert the record only if the key field is four characters
    ' long; otherwise, cancel the insert operation.
    If keyValue.Length = 4 Then
    
      ' Change the key field value to upper case before inserting 
      ' the record in the data source.
      e.Values("CustomerID") = keyValue.ToUpper()
      
      MessageLabel.Text = ""
    
    Else
    
      MessageLabel.Text = "The key field must have four digits."
      e.Cancel = True
    
    End If

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewInsertEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewInsertEventHandler Example</h3>
        
      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated DetailsView control.         -->       
      <asp:PlaceHolder id="DetailsViewPlaceHolder"
        runat="server"/>
        
      <br/><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]"
        insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
        connectionstring=
          "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
            
    </form>
  </body>
</html>

Aşağıdaki kod örneği, bir denetimin olayına DetailsViewInsertEventHandler bildirim temelli olarak temsilci ekleme ItemInserting işlemini DetailsView gösterir.


<%@ 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_ItemInserting(Object sender, 
    DetailsViewInsertEventArgs e)
  {
    // Use the Values property to retrieve the key field value.
    String keyValue = e.Values["CustomerID"].ToString();

    // Insert the record only if the key field is four characters
    // long; otherwise, cancel the insert operation.
    if (keyValue.Length == 4)
    {
      // Change the key field value to upper case before inserting 
      // the record in the data source.
      e.Values["CustomerID"] = keyValue.ToUpper();

      MessageLabel.Text = "";
    }
    else
    {
      MessageLabel.Text = "The key field must have four digits.";
      e.Cancel = true;
    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewInsertEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewInsertEventHandler Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogenerateinsertbutton="true"  
          autogeneraterows="true"
          allowpaging="true"
          oniteminserting="CustomerDetailsView_ItemInserting" 
          runat="server">
               
          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>
                    
        </asp:detailsview>
        
        <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]"
          insertcommand="INSERT INTO [Customers]([CustomerID], 
            [CompanyName], [Address], [City], [PostalCode], 
            [Country]) VALUES (@CustomerID, @CompanyName, @Address, 
            @City, @PostalCode, @Country)"
          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_ItemInserting(ByVal sender As Object, _
    ByVal e As DetailsViewInsertEventArgs) _
    Handles CustomerDetailsView.ItemInserting
  
    ' Use the Values property to retrieve the key field value.
    Dim keyValue As String = e.Values("CustomerID").ToString()

    ' Insert the record only if the key field is four characters
    ' long; otherwise, cancel the insert operation.
    If keyValue.Length = 4 Then
    
      ' Change the key field value to upper case before inserting 
      ' the record in the data source.
      e.Values("CustomerID") = keyValue.ToUpper()
      
      MessageLabel.Text = ""
    
    Else
    
      MessageLabel.Text = "The key field must have four digits."
      e.Cancel = True
    
    End If

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewInsertEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewInsertEventHandler Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogenerateinsertbutton="true"  
          autogeneraterows="true"
          allowpaging="true"
          oniteminserting="CustomerDetailsView_ItemInserting" 
          runat="server">
               
          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>
                    
        </asp:detailsview>
        
        <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]"
          insertcommand="INSERT INTO [Customers]([CustomerID], 
            [CompanyName], [Address], [City], [PostalCode], 
            [Country]) VALUES (@CustomerID, @CompanyName, @Address, 
            @City, @PostalCode, @Country)"
          connectionstring=
          "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

Açıklamalar

Denetim içindeki DetailsView bir Ekle düğmesine (özelliği "Ekle" olarak ayarlanmış bir düğmeItemInserting) tıklandığında, ancak denetim kaydı eklemeden önce CommandName olayı tetiklerDetailsView. Bu, bu olay gerçekleştiğinde veri kaynağına eklemeden önce bir kaydın değerlerini HTML kodlaması gibi özel bir yordam gerçekleştiren bir olay işleyicisi sağlamanıza olanak tanır.

Bir DetailsViewInsertEventHandler temsilci oluşturduğunuzda, olayı işleyecek yöntemi tanımlarsınız. Olayı olay işleyicinizle ilişkilendirmek için, olaya temsilcinin bir örneğini ekleyin. Olay işleyicisi, temsilciyi kaldırmadığınız sürece olay gerçekleştiğinde çağrılır. Olay işleyicisi temsilcileri hakkında daha fazla bilgi için bkz. Olayları İşleme ve Oluşturma.

Uzantı Metotları

Name	Description
GetMethodInfo(Delegate)	Belirtilen temsilci tarafından temsil edilen yöntemi temsil eden bir nesnesi alır.

Şunlara uygulanır

Ayrıca bkz.

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