DataGridCommandEventArgs.CommandSource Eigenschap
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Hiermee haalt u de bron van de opdracht op.
public:
property System::Object ^ CommandSource { System::Object ^ get(); };public object CommandSource { get; }member this.CommandSource : objPublic ReadOnly Property CommandSource As ObjectWaarde van eigenschap
De bron van de opdracht.
Voorbeelden
In het volgende codevoorbeeld ziet u hoe u de bron van de opdracht kunt bepalen met behulp van de CommandSource eigenschap.
<%@ page language="C#" %>
<%@ import namespace="System.Data" %>
<%@ import namespace="System.Data.SqlClient" %>
<!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)
{
// Call the BindGrid helper method to bind the
// DataGrid control to the data source the first
// time the page is loaded.
if(!IsPostBack)
{
BindGrid();
}
}
void BindGrid()
{
// Declare the connection string and query string.
// This example uses Microsoft SQL Server and connects
// to the Northwind sample database.
String connectionString = "server=localhost;database=NorthWind;Integrated Security=SSPI";
String queryString = "Select [FirstName],[LastName],[Title] From [Employees]";
// Run the query and display the results.
DataSet ds = RunQuery(connectionString, queryString);
if(ds != null)
{
ItemsGrid.DataSource = ds;
ItemsGrid.DataBind();
Message.Text = "";
}
else
{
Message.Text = "No records found.";
}
}
DataSet RunQuery(String connectionString, String queryString)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlDataAdapter adapter;
DataSet ds;
try
{
// Run the query and create the DataSet object.
ds = new DataSet();
adapter = new SqlDataAdapter(queryString, connection);
adapter.Fill(ds);
}
catch(Exception ex)
{
// Display an error message.
Message.Text = "Unable to query data source.";
ds = null;
}
finally
{
connection.Close();
}
return ds;
}
void ItemsGrid_ItemCommand(Object sender, DataGridCommandEventArgs e)
{
// Use the CommandSource property to retrieve the LinkButton
// control that raised the event.
LinkButton selectButton = (LinkButton)e.CommandSource;
// Display the desciption for the job title.
Message.Text = selectButton.Text + " - ";
switch (selectButton.Text)
{
case "Sales Representative":
Message.Text += "Sells products to customers.";
break;
case "Vice President, Sales":
Message.Text += "Manages the sales division.";
break;
case "Sales Manager":
Message.Text += "Manages a sales team.";
break;
case "Inside Sales Coordinator":
Message.Text += "Coordinates cross team communications.";
break;
default:
Message.Text += "To be determined.";
break;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DataGridCommandEventArgs CommandSource Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGridCommandEventArgs CommandSource Example</h3>
<asp:datagrid
id="ItemsGrid"
autogeneratecolumns="false"
onitemcommand="ItemsGrid_ItemCommand"
runat="server">
<columns>
<asp:BoundColumn DataField="FirstName"
headertext="First Name"/>
<asp:BoundColumn DataField="LastName"
headertext="Last Name"/>
<asp:buttoncolumn buttontype="LinkButton"
datatextfield="Title"
headertext="Title"/>
</columns>
</asp:datagrid>
<br/><br/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
<%@ page language="VB" %>
<%@ import namespace="System.Data" %>
<%@ import namespace="System.Data.SqlClient" %>
<!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)
' Call the BindGrid helper method to bind the
' DataGrid control to the data source the first
' time the page is loaded.
If Not IsPostBack Then
BindGrid()
End If
End Sub
Sub BindGrid()
' Declare the connection string and query string.
' This example uses Microsoft SQL Server and connects
' to the Northwind sample database.
Dim connectionString As String = "server=localhost;database=NorthWind;Integrated Security=SSPI"
Dim queryString As String = "Select [FirstName],[LastName],[Title] From [Employees]"
' Run the query and display the results.
Dim ds As DataSet = RunQuery(connectionString, queryString)
If ds IsNot Nothing Then
ItemsGrid.DataSource = ds
ItemsGrid.DataBind()
Message.Text = ""
Else
Message.Text = "No records found."
End If
End Sub
Function RunQuery(ByVal connectionString As String, ByVal queryString As String) As DataSet
Dim connection As New SqlConnection(connectionString)
Dim adapter As SqlDataAdapter
Dim ds As DataSet
Try
' Run the query and create the DataSet object.
ds = New DataSet()
adapter = New SqlDataAdapter(queryString, connection)
adapter.Fill(ds)
Catch ex As Exception
' Display an error message.
Message.Text = "Unable to query data source."
ds = Nothing
Finally
Connection.Close()
End Try
Return ds
End Function
Sub ItemsGrid_ItemCommand(ByVal sender As Object, ByVal e As DataGridCommandEventArgs)
' Use the CommandSource property to retrieve the LinkButton
' control that raised the event.
Dim selectButton As LinkButton = CType(e.CommandSource, LinkButton)
' Display the desciption for the job title.
Message.Text = selectButton.Text & " - "
Select Case (selectButton.Text)
Case "Sales Representative"
Message.Text &= "Sells products to customers."
Case "Vice President, Sales"
Message.Text &= "Manages the sales division."
Case "Sales Manager"
Message.Text &= "Manages a sales team."
Case "Inside Sales Coordinator"
Message.Text &= "Coordinates cross team communications."
Case Else
Message.Text &= "To be determined."
End Select
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DataGridCommandEventArgs CommandSource Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGridCommandEventArgs CommandSource Example</h3>
<asp:datagrid
id="ItemsGrid"
autogeneratecolumns="false"
onitemcommand="ItemsGrid_ItemCommand"
runat="server">
<columns>
<asp:BoundColumn DataField="FirstName"
headertext="First Name"/>
<asp:BoundColumn DataField="LastName"
headertext="Last Name"/>
<asp:buttoncolumn buttontype="LinkButton"
datatextfield="Title"
headertext="Title"/>
</columns>
</asp:datagrid>
<br/><br/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
Opmerkingen
Gebruik de CommandSource eigenschap om de opdrachtbron te bepalen die de gebeurtenis heeft gegenereerd. Deze eigenschap wordt vaak gebruikt om te bepalen welke opdracht de gebeurtenis heeft gegenereerd.
