ListViewDeletedEventArgs.Values Eigenschaft
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Ruft die Nichtschlüsselfeldwerte für das gelöschte Element ab.
public:
property System::Collections::Specialized::IOrderedDictionary ^ Values { System::Collections::Specialized::IOrderedDictionary ^ get(); };public System.Collections.Specialized.IOrderedDictionary Values { get; }member this.Values : System.Collections.Specialized.IOrderedDictionaryPublic ReadOnly Property Values As IOrderedDictionaryEigenschaftswert
Die Nichtschlüsselfeldwerte für das gelöschte Element.
Beispiele
Das folgende Beispiel zeigt, wie Sie mithilfe der Values Eigenschaft auf die Werte der Nichtschlüsselfelder für ein gelöschtes Element zugreifen.
<%@ 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 ContactsListView_ItemDeleted(Object sender, ListViewDeletedEventArgs 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>ListViewDeletedEventArgs Keys and Values Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ListViewDeletedEventArgs Keys and Values Example</h3>
<asp:Label ID="Message"
ForeColor="Red"
runat="server"/>
<br/>
<asp:ListView ID="ContactsListView"
DataSourceID="ContactsDataSource"
DataKeyNames="ContactID"
OnItemDeleted="ContactsListView_ItemDeleted"
runat="server">
<LayoutTemplate>
<table cellpadding="2" runat="server" id="tblContacts" width="640px">
<tr id="itemPlaceholder" runat="server"></tr>
</table>
<asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
<Fields>
<asp:NextPreviousPagerField
ShowFirstPageButton="true" ShowLastPageButton="true"
FirstPageText="|<< " LastPageText=" >>|"
NextPageText=" > " PreviousPageText=" < " />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td valign="top">
<asp:Label ID="FirstNameLabel" runat="server" Text='<%#Bind("FirstName") %>' />
<asp:Label ID="LastNameLabel" runat="server" Text='<%#Bind("LastName") %>' />
</td>
<td>
<asp:Label ID="EmailLabel" runat="server" Text='<%#Bind("EmailAddress") %>' />
</td>
<td>
<asp:LinkButton ID="DeleteButton" runat="server"
CommandName="Delete"
Text="Delete"
OnClientClick="return confirm('Are you sure?');" />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
<br/><br />
<asp:Label ID="KeysMessageLabel"
ForeColor="Red"
runat="server"/>
<br/>
<asp:Label ID="ValuesMessageLabel"
ForeColor="Red"
runat="server"/>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the AdventureWorks sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:SqlDataSource ID="ContactsDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] FROM Person.Contact"
DeleteCommand="DELETE FROM Person.Contact WHERE [ContactID] = @ContactID">
<DeleteParameters>
<asp:Parameter Name="ContactID" Type="Int32" />
</DeleteParameters>
</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 ContactsListView_ItemDeleted(sender As Object, e As ListViewDeletedEventArgs)
' Display the value of the key fields in the Keys property.
KeysMessageLabel.Text = _
"The key fields for the deleted record are: <br/>"
For Each entry As DictionaryEntry In e.Keys
DisplayValue(entry, KeysMessageLabel)
Next
' Display the value of the non-key fields in the Values
' property.
ValuesMessageLabel.Text = _
"The non-key fields for the deleted record are: <br/>"
For Each entry As DictionaryEntry In e.Values
DisplayValue(entry, ValuesMessageLabel)
Next
End Sub
Sub DisplayValue(entry As DictionaryEntry, displayLabel As Label)
' Display the field name contained in the DictionaryEntry object.
If entry.Key IsNot Nothing Then
displayLabel.Text &= "Name=" & entry.Key.ToString() & ", "
Else
displayLabel.Text &= "Name=null, "
End If
' Display the field value contained in the DictionaryEntry object.
If entry.Value IsNot Nothing
displayLabel.Text &= "Value=" & entry.Value.ToString() & "<br/>"
else
displayLabel.Text &= "Value=null<br/>"
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>ListViewDeletedEventArgs Keys and Values Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ListViewDeletedEventArgs Keys and Values Example</h3>
<asp:Label ID="Message"
ForeColor="Red"
runat="server"/>
<br/>
<asp:ListView ID="ContactsListView"
DataSourceID="ContactsDataSource"
DataKeyNames="ContactID"
OnItemDeleted="ContactsListView_ItemDeleted"
runat="server">
<LayoutTemplate>
<table cellpadding="2" runat="server" id="tblContacts" width="640px">
<tr id="itemPlaceholder" runat="server"></tr>
</table>
<asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
<Fields>
<asp:NextPreviousPagerField
ShowFirstPageButton="true" ShowLastPageButton="true"
FirstPageText="|<< " LastPageText=" >>|"
NextPageText=" > " PreviousPageText=" < " />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td valign="top">
<asp:Label ID="FirstNameLabel" runat="server" Text='<%#Bind("FirstName") %>' />
<asp:Label ID="LastNameLabel" runat="server" Text='<%#Bind("LastName") %>' />
</td>
<td>
<asp:Label ID="EmailLabel" runat="server" Text='<%#Bind("EmailAddress") %>' />
</td>
<td>
<asp:LinkButton ID="DeleteButton" runat="server"
CommandName="Delete"
Text="Delete"
OnClientClick="return confirm('Are you sure?');" />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
<br/><br />
<asp:Label ID="KeysMessageLabel"
ForeColor="Red"
runat="server"/>
<br/>
<asp:Label ID="ValuesMessageLabel"
ForeColor="Red"
runat="server"/>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the AdventureWorks sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:SqlDataSource ID="ContactsDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] FROM Person.Contact"
DeleteCommand="DELETE FROM Person.Contact WHERE [ContactID] = @ContactID">
<DeleteParameters>
<asp:Parameter Name="ContactID" Type="Int32" />
</DeleteParameters>
</asp:SqlDataSource>
</form>
</body>
</html>
Hinweise
Verwenden Sie die Values Eigenschaft, um auf die Werte der Nichtschlüsselfelder für ein gelöschtes Element zuzugreifen. Sie können beispielsweise diese Werte verwenden, um ein Protokoll gelöschter Elemente beizubehalten.
Hinweis
Die Values Eigenschaft wird nur ausgefüllt, wenn bidirektionale Bindungsausdrücke in den ListView Vorlagen verwendet werden, z. B. die ItemTemplate Vorlage. Weitere Informationen zu bidirektionale Bindungsausdrücken finden Sie unter Data-Binding Ausdruckssyntax.
Die Values Eigenschaft gibt ein Objekt zurück, das die IOrderedDictionary Schnittstelle implementiert. Das Objekt enthält DictionaryEntry Objekte, die die Nichtschlüsselfelder des gelöschten Elements darstellen.
Hinweis
Diese Eigenschaft enthält nicht die Schlüsselfelder (wie durch die ListView.DataKeyNames Eigenschaft angegeben) für das gelöschte Element. Verwenden Sie die Keys Eigenschaft, um auf die Schlüsselfelder zuzugreifen.
