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ASPxDashboard.CustomFilterExpression Event

Allows you to include WHERE clauses into DashboardSqlDataSource queries.

Namespace: DevExpress.DashboardWeb

Assembly: DevExpress.Dashboard.v18.2.Web.WebForms.dll

public event CustomFilterExpressionWebEventHandler CustomFilterExpression

Public Event CustomFilterExpression As CustomFilterExpressionWebEventHandler

Event Data

The CustomFilterExpression event handler receives an argument of the CustomFilterExpressionWebEventArgs type. The following properties provide information specific to this event.

Property	Description
DashboardId	Gets the identifier of the current dashboard.
DataSourceComponentName	Get the data source name, used in code to identify the data source's object, for which the event has been raised.
DataSourceName	Gets the name of the data source for which the event has been raised.
FilterExpression	Gets or sets the filter expression that defines a WHERE clause included in the SQL query.
QueryName	Gets the name of the query for which the event was raised.
TableName	Indicates the name of a data table to which the CustomFilterExpressionEventArgs.FilterExpression applies.

Remarks

The CustomFilterExpression event fires for each SelectQuery within DashboardSqlDataSource (the SqlDataSource.Queries property) and allows you to include a WHERE clause to a query at runtime using the CustomFilterExpressionEventArgs.FilterExpression event parameter. If filtering is already applied to the SQL query, CustomFilterExpressionEventArgs.FilterExpression returns a corresponding filter criteria.

Note

The CustomFilterExpression event is not raised for custom SQL queries and stored procedures.

Examples

The following example shows how to filter an SQL query at runtime using the ASPxDashboard.CustomFilterExpression event. The CustomFilterExpressionEventArgs.TableName event parameter is used to check the name of the query that should be filtered. The CustomFilterExpressionEventArgs.FilterExpression property specifies the required filter criteria.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/aspxdashboard-how-to-filter-an-sql-query-at-runtime-t479085.

<%@ Page Language="vb" AutoEventWireup="true" CodeBehind="WebForm1.aspx.vb" 
         Inherits="ASPxDashboard_CustomFilterExpression.WebForm1" %>

<%@ Register Assembly="DevExpress.Dashboard.v17.1.Web, Version=17.1.8.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.DashboardWeb" TagPrefix="dx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div style="position: absolute; top: 0; left: 0; right: 0; bottom: 0;">
        <dx:ASPxDashboard ID="ASPxDashboard1" runat="server" Width="100%" Height="100%" 
            oncustomfilterexpression="ASPxDashboard1_CustomFilterExpression" 
            WorkingMode="Viewer">
        </dx:ASPxDashboard>
    </div>
    </form>
</body>
</html>

Imports System
Imports DevExpress.DashboardWeb
Imports DevExpress.Data.Filtering
Imports DevExpress.DashboardCommon

Namespace ASPxDashboard_CustomFilterExpression
    Partial Public Class WebForm1
        Inherits System.Web.UI.Page

        Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
            ASPxDashboard1.SetDashboardStorage(New DashboardFileStorage("~/App_Data/Dashboards"))
        End Sub

        Protected Sub ASPxDashboard1_CustomFilterExpression(ByVal sender As Object, _
                                                            ByVal e As CustomFilterExpressionWebEventArgs)
            If e.DataSourceName = "SQL Data Source 1" AndAlso e.TableName = "Invoices" Then
                e.FilterExpression = New BinaryOperator("CustomerID", "AROUT", BinaryOperatorType.Equal)
            End If
        End Sub
    End Class
End Namespace

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" 
         Inherits="ASPxDashboard_CustomFilterExpression.WebForm1" %>

<%@ Register Assembly="DevExpress.Dashboard.v17.1.Web, Version=17.1.8.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.DashboardWeb" TagPrefix="dx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div style="position: absolute; top: 0; left: 0; right: 0; bottom: 0;">
        <dx:ASPxDashboard ID="ASPxDashboard1" runat="server" Width="100%" Height="100%" 
            oncustomfilterexpression="ASPxDashboard1_CustomFilterExpression" 
            WorkingMode="Viewer">
        </dx:ASPxDashboard>
    </div>
    </form>
</body>
</html>

using System;
using DevExpress.DashboardWeb;
using DevExpress.Data.Filtering;
using DevExpress.DashboardCommon;

namespace ASPxDashboard_CustomFilterExpression {
    public partial class WebForm1 : System.Web.UI.Page {
        protected void Page_Load(object sender, EventArgs e) {
            ASPxDashboard1.SetDashboardStorage(new DashboardFileStorage("~/App_Data/Dashboards"));
        }

        protected void ASPxDashboard1_CustomFilterExpression(object sender, CustomFilterExpressionWebEventArgs e) {
            if (e.DataSourceName == "SQL Data Source 1" && e.TableName == "Invoices") {
                e.FilterExpression = new BinaryOperator("CustomerID", "AROUT", BinaryOperatorType.Equal);
            }
        }
    }
}