SqlDataSourceFilteringEventArgs Class
Definition
Important
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Provides data for the Filtering event of the SqlDataSource control.
public ref class SqlDataSourceFilteringEventArgs : System::ComponentModel::CancelEventArgs
public class SqlDataSourceFilteringEventArgs : System.ComponentModel.CancelEventArgs
type SqlDataSourceFilteringEventArgs = class
inherit CancelEventArgs
Public Class SqlDataSourceFilteringEventArgs
Inherits CancelEventArgs
- Inheritance
Examples
The following code example demonstrates how to retrieve data from the Northwind database and filter it using a FilterExpression and FilterParameters. The FilterExpression of the SqlDataSource is applied anytime the Select method is executed to retrieve data. In this example, the FilterExpression contains a placeholder for a filter parameter, which is contained in the FilterParameters collection. In the Filtering event, the filter parameter is displayed in a Label control.
<%@ 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">
//Protected Sub SqlDataSource1_Filtering(ByVal sender As Object, _
// ByVal e As System.Web.UI.WebControls.SqlDataSourceFilteringEventArgs)
// Label1.Text = e.ParameterValues(0).ToString()
//End Sub
protected void SqlDataSource1_Filtering(object sender, SqlDataSourceFilteringEventArgs e)
{
Label1.Text = e.ParameterValues[0].ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="FORM1" runat="server">
<p>Show all employees with the following title:
<asp:DropDownList
id="DropDownList1"
runat="server"
AutoPostBack="True">
<asp:ListItem>Sales Representative</asp:ListItem>
<asp:ListItem>Sales Manager</asp:ListItem>
<asp:ListItem>Vice President, Sales</asp:ListItem>
</asp:DropDownList></p>
<asp:SqlDataSource
id="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:NorthwindConnection %>"
SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees"
FilterExpression="Title='{0}'" OnFiltering="SqlDataSource1_Filtering">
<FilterParameters>
<asp:ControlParameter Name="Title" ControlId="DropDownList1" PropertyName="SelectedValue"/>
</FilterParameters>
</asp:SqlDataSource><br />
<asp:GridView
id="GridView1"
runat="server"
DataSourceID="SqlDataSource1"
AutoGenerateColumns="False">
<columns>
<asp:BoundField Visible="False" DataField="EmployeeID" />
<asp:BoundField HeaderText="First Name" DataField="FirstName" />
<asp:BoundField HeaderText="Last Name" DataField="LastName" />
</columns>
</asp:GridView>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</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">
Protected Sub SqlDataSource1_Filtering(ByVal sender As Object, _
ByVal e As System.Web.UI.WebControls.SqlDataSourceFilteringEventArgs)
Label1.Text = e.ParameterValues(0).ToString()
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<p>Show all employees with the following title:
<asp:DropDownList
id="DropDownList1"
runat="server"
AutoPostBack="True">
<asp:ListItem>Sales Representative</asp:ListItem>
<asp:ListItem>Sales Manager</asp:ListItem>
<asp:ListItem>Vice President, Sales</asp:ListItem>
</asp:DropDownList></p>
<asp:SqlDataSource
id="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:NorthwindConnection %>"
SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees"
FilterExpression="Title='{0}'" OnFiltering="SqlDataSource1_Filtering">
<FilterParameters>
<asp:ControlParameter Name="Title" ControlId="DropDownList1" PropertyName="SelectedValue"/>
</FilterParameters>
</asp:SqlDataSource><br />
<asp:GridView
id="GridView1"
runat="server"
DataSourceID="SqlDataSource1"
AutoGenerateColumns="False">
<columns>
<asp:BoundField Visible="False" DataField="EmployeeID" />
<asp:BoundField HeaderText="First Name" DataField="FirstName" />
<asp:BoundField HeaderText="Last Name" DataField="LastName" />
</columns>
</asp:GridView>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>
</body>
</html>
Remarks
The SqlDataSourceFilteringEventArgs class is used to pass data to the Filtering event handler of the SqlDataSource control. The ParameterValues property provides access to the filter parameter values before the filtering operation is performed. You can cancel the Select method by setting the Cancel property of the ObjectDataSourceFilteringEventArgs to true
. Filtering is supported when the DataSourceMode property is set to the DataSet value.
Constructors
SqlDataSourceFilteringEventArgs(IOrderedDictionary) |
Initializes a new instance of the SqlDataSourceFilteringEventArgs class by using the specified object. |
Properties
Cancel |
Gets or sets a value indicating whether the event should be canceled. (Inherited from CancelEventArgs) |
ParameterValues |
Gets an IOrderedDictionary object that provides access to the Parameter objects of the SqlDataSource class. |
Methods
Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
GetType() |
Gets the Type of the current instance. (Inherited from Object) |
MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
ToString() |
Returns a string that represents the current object. (Inherited from Object) |
Applies to
See also
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