DetailsViewDeletedEventArgs.Keys Property

 

Gets an ordered dictionary of key field name/value pairs that contains the names and values of the key fields of the deleted items.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

public IOrderedDictionary Keys { get; }

Property Value

Type: System.Collections.Specialized.IOrderedDictionary

An IOrderedDictionary that contains an ordered dictionary of key field name/value pairs used to match the item to delete.

Use the Keys property to access the values of the key fields for the record to delete. For example, you can use these values to keep a log of deleted records.

System_CAPS_noteNote

This property contains only the key fields. To access the non-key fields, use the Values property.

The Keys property returns an object that implements the IOrderedDictionary interface. The object contains DictionaryEntry objects that represent the key fields of the record to delete.

System_CAPS_noteNote

As a shortcut, you can also use the indexer of the IOrderedDictionary object to access the field values directly.

The following code example demonstrates how to use the Keys property to access the values of the key fields for a deleted record.


<%@ 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 StoresDetailView_ItemDeleted(Object sender, 
  DetailsViewDeletedEventArgs e)
  {
    // Display the value of the key fields in the Keys property.
    KeysMessageLabel.Text =
      "The key fields for the deleted record are: <br/>";

    foreach (DictionaryEntry entry in e.Keys)
    {
      DisplayValue(entry, KeysMessageLabel);
    }

    // Display the value of the non-key fields in the Values 
    // property.
    ValuesMessageLabel.Text =
      "The non-key fields for the deleted record are: <br/>";

    foreach (DictionaryEntry entry in e.Values)
    {
      DisplayValue(entry, ValuesMessageLabel);
    }
  }

  void DisplayValue(DictionaryEntry entry, Label displayLabel)
  {
    // Display the field name contained in the DictionaryEntry object.
    if (entry.Key != null)
    {
      displayLabel.Text += "Name=" + entry.Key.ToString() + ", ";
    }
    else
    {
      displayLabel.Text += "Name=null, ";
    }

    // Display the field value contained in the DictionaryEntry object.
    if (entry.Value != null)
    {
      displayLabel.Text += "Value=" + entry.Value.ToString() + "<br/>";
    }
    else
    {
      displayLabel.Text += "Value=null<br/>";
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewDeletedEventArgs Keys and Values Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>DetailsViewDeletedEventArgs Keys and Values Example</h3>

        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogeneratedeletebutton="true"  
          autogeneraterows="true"
          allowpaging="true"
          onitemdeleted="StoresDetailView_ItemDeleted" 
          runat="server">

          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>

        </asp:detailsview>

        <asp:label id="KeysMessageLabel"
          forecolor="Red"
          runat="server"/>

        <br/><br/>

        <asp:label id="ValuesMessageLabel"
          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]"
          deletecommand="Delete [Customers] 
            Where [CustomerID]=@CustomerID"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>

      </form>
  </body>
</html>

.NET Framework
Available since 2.0
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