ParametersRequestEventArgs Class

Namespace: DevExpress.XtraReports.Parameters

Assembly: DevExpress.Printing.v21.1.Core.dll


public class ParametersRequestEventArgs :


The XtraReport.ParametersRequestBeforeShow and XtraReport.ParametersRequestSubmit events occur before and after displaying the Parameters window or pane to an end-user. The ParametersRequestEventArgs class introduces the ParametersRequestEventArgs.ParametersInformation property, which provides access to the information about parameters. Each ParameterInfo class contains information about the ParameterInfo.Parameter itself, as well as about the ParameterInfo.Editor which is used to enter the parameter’s value.


ParametersRequestEventArgs objects are automatically created, initialized and passed to the XtraReport.ParametersRequestBeforeShow and XtraReport.ParametersRequestSubmit event handlers.


This example illustrates how to change the standard editor displayed in Print Preview for a report parameter with a custom one.


Print Preview displays default value editors according to report parameter types (their Parameter.Type property values).

A custom editor specified in this example is used only for demonstration purposes, because a LookUpEdit is automatically assigned to parameters for which the ReportParameter.LookUpValues property is specified.

Handle the XtraReport.ParametersRequestBeforeShow event and assign a custom editor to the ParameterInfo.Editor property of the ParameterInfo object stored in the ParametersRequestEventArgs.ParametersInformation collection to provide a custom report parameter editor in a WinForms application.

using System;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Controls;
using DevExpress.XtraReports.UI;
using DevExpress.XtraReports.Parameters;
// ...

private void XtraReport1_ParametersRequestBeforeShow(object sender, ParametersRequestEventArgs e) {
    CategoriesDataSet dataSet = new CategoriesDataSet();
    CategoriesDataSetTableAdapters.CategoriesTableAdapter adapter = 
        new CategoriesDataSetTableAdapters.CategoriesTableAdapter();

    foreach (ParameterInfo info in e.ParametersInformation) {
        if (info.Parameter.Name == "parameter1") {
            LookUpEdit lookUpEdit = new LookUpEdit();
            lookUpEdit.Properties.DataSource = dataSet.Categories;
            lookUpEdit.Properties.DisplayMember = "CategoryName";
            lookUpEdit.Properties.ValueMember = "CategoryID";
                LookUpColumnInfo("CategoryName", 0, "Category Name"));
            info.Editor = lookUpEdit;


See Also