ParameterInfo Class

Represents a class containing information about a specific parameter and its editor.

Namespace: DevExpress.XtraReports.Parameters

Assembly: DevExpress.Printing.v19.1.Core.dll

Declaration

C#

public class ParameterInfo

VB.NET

Public Class ParameterInfo

Related API Members

The following members return ParameterInfo objects:

• ParametersRequestValueChangedEventArgs.ChangedParameterInfo

Remarks

The ParameterInfo class provides access to the ParameterInfo.Parameter, for which the XtraReport.ParametersRequestBeforeShow or XtraReport.ParametersRequestSubmit event is raised, as well as the capability to access or change the ParameterInfo.Editor, which is used to enter the parameter’s value when an end-user is asked for report parameters.

Example

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

Tip

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.

C#

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();
    adapter.Fill(dataSet.Categories);

    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";
            lookUpEdit.Properties.Columns.Add(new 
                LookUpColumnInfo("CategoryName", 0, "Category Name"));
            info.Editor = lookUpEdit;
        }
    }
}

VB.NET

Imports System
Imports DevExpress.XtraEditors
Imports DevExpress.XtraEditors.Controls
Imports DevExpress.XtraReports.UI
Imports DevExpress.XtraReports.Parameters
' ...

Private Sub XtraReport1_ParametersRequestBeforeShow(sender As Object, e As ParametersRequestEventArgs)
    Dim DataSet As New CategoriesDataSet()
    Dim Adapter As New CategoriesDataSetTableAdapters.CategoriesTableAdapter()
    Adapter.Fill(DataSet.Categories)

    Dim Info As ParameterInfo

    For Each Info In e.ParametersInformation
        If Info.Parameter.Name = "Parameter1" Then
            Dim LookUpEdit As New LookUpEdit()
            LookUpEdit.Properties.DataSource = DataSet.Categories
            LookUpEdit.Properties.DisplayMember = "CategoryName"
            LookUpEdit.Properties.ValueMember = "CategoryID"
            LookUpEdit.Properties.Columns.Add(New _
                LookUpColumnInfo("CategoryName", 0, "Category Name"))
            Info.Editor = LookUpEdit
        End If
    Next Info
End Sub

Inheritance

Object

ParameterInfo