GridViewDeleteEventArgs.Values Propiedad
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Obtiene un diccionario de los pares nombre/valor de los campos no clave para la fila que se va a eliminar.
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 IOrderedDictionaryValor de propiedad
Un objeto IOrderedDictionary que contiene los pares nombre/valor de los campos no clave de la fila que se va a eliminar.
Ejemplos
En el ejemplo siguiente se muestra cómo usar la Values propiedad para obtener los valores de los campos que no son clave de la fila que se va a eliminar. A continuación, los valores se escriben en un archivo de registro de registros de registros eliminados.
<%@ 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>
Comentarios
La Values propiedad se rellena automáticamente con los pares nombre-valor de los campos que no son clave de la fila. Para determinar el nombre de campo de una entrada, use la DictionaryEntry.Key propiedad de un System.Collections.DictionaryEntry objeto en el Values diccionario. Para determinar el valor de una entrada, use la DictionaryEntry.Value propiedad .
Nota:
El campo de clave principal o los campos no se incluyen en este diccionario. Para tener acceso a los valores del campo o campos de clave principal, use la Keys propiedad .
Se aplica a
Consulte también
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