SqlDataSourceFilteringEventArgs Classe

Definição

Fornece dados para o evento Filtering do controle SqlDataSource.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
Herança
SqlDataSourceFilteringEventArgs

Exemplos

O exemplo de código a seguir demonstra como recuperar dados do banco de dados Northwind e filtrá-los usando um FilterExpression e o FilterParameters .The following code example demonstrates how to retrieve data from the Northwind database and filter it using a FilterExpression and FilterParameters. O FilterExpression do SqlDataSource é aplicado sempre que o Select método é executado para recuperar dados.The FilterExpression of the SqlDataSource is applied anytime the Select method is executed to retrieve data. Neste exemplo, o FilterExpression contém um espaço reservado para um parâmetro de filtro, que está contido na FilterParameters coleção.In this example, the FilterExpression contains a placeholder for a filter parameter, which is contained in the FilterParameters collection. No Filtering evento, o parâmetro Filter é exibido em um Label controle.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>

Comentários

A SqlDataSourceFilteringEventArgs classe é usada para passar dados para o Filtering manipulador de eventos do SqlDataSource controle.The SqlDataSourceFilteringEventArgs class is used to pass data to the Filtering event handler of the SqlDataSource control. A ParameterValues propriedade fornece acesso aos valores de parâmetro de filtro antes que a operação de filtragem seja executada.The ParameterValues property provides access to the filter parameter values before the filtering operation is performed. Você pode cancelar o Select método definindo a Cancel Propriedade do ObjectDataSourceFilteringEventArgs para true .You can cancel the Select method by setting the Cancel property of the ObjectDataSourceFilteringEventArgs to true. Há suporte para a filtragem quando a DataSourceMode propriedade é definida como o DataSet valor.Filtering is supported when the DataSourceMode property is set to the DataSet value.

Construtores

SqlDataSourceFilteringEventArgs(IOrderedDictionary)

Inicializa uma nova instância da classe SqlDataSourceFilteringEventArgs usando o objeto especificado.Initializes a new instance of the SqlDataSourceFilteringEventArgs class by using the specified object.

Propriedades

Cancel

Obtém ou define um valor que indica se o evento deve ser cancelado.Gets or sets a value indicating whether the event should be canceled.

(Herdado de CancelEventArgs)
ParameterValues

Obtém um objeto IOrderedDictionary que fornece acesso aos objetos Parameter da classe SqlDataSource.Gets an IOrderedDictionary object that provides access to the Parameter objects of the SqlDataSource class.

Métodos

Equals(Object)

Determina se o objeto especificado é igual ao objeto atual.Determines whether the specified object is equal to the current object.

(Herdado de Object)
GetHashCode()

Serve como a função de hash padrão.Serves as the default hash function.

(Herdado de Object)
GetType()

Obtém o Type da instância atual.Gets the Type of the current instance.

(Herdado de Object)
MemberwiseClone()

Cria uma cópia superficial do Object atual.Creates a shallow copy of the current Object.

(Herdado de Object)
ToString()

Retorna uma cadeia de caracteres que representa o objeto atual.Returns a string that represents the current object.

(Herdado de Object)

Aplica-se a

Confira também