GridViewDeleteEventArgs.Values Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets a dictionary of the non-key field name/value pairs for the row to delete.
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 IOrderedDictionaryProperty Value
A IOrderedDictionary object that contains the non-key field name/value pairs of the row to delete.
Examples
The following example shows how to use the Values property to get the values of the non-key fields for the row to delete. The values are then written to a log file of deleted records.
<%@ Page language="C#" %>
<%@ import namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void CustomersGridView_RowDeleting(Object sender, GridViewDeleteEventArgs e)
{
// Record the delete operation in a log file.
// Create the log text.
String logText = "";
// Append the values of the key fields to the log text.
foreach (DictionaryEntry keyEntry in e.Keys)
{
logText += keyEntry.Key + "=" + keyEntry.Value + ";";
}
// Append the values of the non-key fields to the log text.
foreach (DictionaryEntry valueEntry in e.Values)
{
logText += valueEntry.Key + "=" + valueEntry.Value + ";";
}
// Display the log content.
LogTextLabel.Text = logText;
// Append the text to a log file.
try
{
StreamWriter sw;
sw = File.AppendText(Server.MapPath(null) + "\\deletelog.txt");
sw.WriteLine(logText);
sw.Flush();
sw.Close();
}
catch(UnauthorizedAccessException ex)
{
// You must provide read/write access to the file using ACLs.
LogErrorLabel.Text = "You do not have permission to write to the log.";
}
}
void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs e)
{
if (e.Exception == null)
{
// The delete operation succeeded. Clear the message label.
Message.Text = "";
}
else
{
// The delete operation failed. Display an error message.
Message.Text = e.AffectedRows.ToString() + " rows deleted. " + e.Exception.Message;
e.ExceptionHandled = true;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewDeleteEventArgs Keys and Values Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewDeleteEventArgs Keys and Values Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:label id="LogTextLabel"
forecolor="Red"
runat="server"/>
<br/>
<asp:label id="LogErrorLabel"
forecolor="Red"
runat="server"/>
<br/>
<asp:gridview id="CustomersGridView"
allowpaging="true"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogeneratedeletebutton="true"
datakeynames="CustomerID"
onrowdeleted="CustomersGridView_RowDeleted"
onrowdeleting="CustomersGridView_RowDeleting"
runat="server">
</asp:gridview>
<!-- 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="CustomersSqlDataSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
deletecommand="Delete from Customers where CustomerID = @CustomerID"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
<%@ Page language="VB" %>
<%@ import namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub CustomersGridView_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)
' Record the delete operation in a log file.
' Create the log text.
Dim logText As String = ""
' Append the values of the key fields to the log text.
Dim i As Integer
For i = 0 To e.Keys.Count - 1
logText &= e.Keys(i).ToString() & ";"
Next
' Append the values of the non-key fields to the log text.
For i = 0 To e.Values.Count - 1
If e.Values(i) IsNot Nothing Then
logText &= e.Values(i).ToString() & ";"
Else
logText &= "Nothing" & ";"
End If
Next
' Display the log content.
LogTextLabel.Text = logText
' Append the text to a log file.
Try
Dim sw As StreamWriter
sw = File.AppendText(Server.MapPath(Nothing) & "\deletelog.txt")
sw.WriteLine(logText)
sw.Flush()
sw.Close()
Catch ex As UnauthorizedAccessException
' You must provide read/write access to the file using ACLs.
LogErrorLabel.Text = "You do not have permission to write to the log."
End Try
End Sub
Sub CustomersGridView_RowDeleted(ByVal sender As Object, ByVal e As GridViewDeletedEventArgs)
If e.Exception Is Nothing Then
' The delete operation succeeded. Clear the message label.
Message.Text = ""
Else
' The delete operation failed. Display an error message.
Message.Text = e.AffectedRows.ToString() & " rows deleted. " & e.Exception.Message
e.ExceptionHandled = True
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewDeleteEventArgs Keys and Values Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewDeleteEventArgs Keys and Values Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:label id="LogTextLabel"
forecolor="Red"
runat="server"/>
<br/>
<asp:label id="LogErrorLabel"
forecolor="Red"
runat="server"/>
<br/>
<asp:gridview id="CustomersGridView"
allowpaging="true"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogeneratedeletebutton="true"
datakeynames="CustomerID"
onrowdeleted="CustomersGridView_RowDeleted"
onrowdeleting="CustomersGridView_RowDeleting"
runat="server">
</asp:gridview>
<!-- 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="CustomersSqlDataSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
deletecommand="Delete from Customers where CustomerID = @CustomerID"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Remarks
The Values property is automatically populated with the name/value pairs of the non-key fields for the row. To determine the field name of an entry, use the DictionaryEntry.Key property of a System.Collections.DictionaryEntry object in the Values dictionary. To determine the value of an entry, use the DictionaryEntry.Value property.
Note
The primary key field or fields are not included in this dictionary. To access the values of the primary key field or fields, use the Keys property.
Applies to
See also
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