ReportParameterInfo Class

Encapsulates information about report parameters.

Namespace: Microsoft.Reporting.WinForms
Assembly: Microsoft.ReportViewer.WinForms (in microsoft.reportviewer.winforms.dll)

Syntax

'Declaration
Public NotInheritable Class ReportParameterInfo

'Usage
Dim instance As ReportParameterInfo

public sealed class ReportParameterInfo

public ref class ReportParameterInfo sealed

public final class ReportParameterInfo

public final class ReportParameterInfo

Remarks

The ReportParameterInfo class can be used to determine parameter requirements for a report at runtime.

Example

The following code sample assumes a WinForms application with a ReportViewer control. The code programmatically loads a sample report from the report server and iterates through the parameters encapsulated in the ReportParameterInfoCollection property of the ServerReport object, showing information about each report parameter.

[C#]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.Reporting.WinForms;

namespace ParamSample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            // Set Processing Mode
            reportViewer1.ProcessingMode = ProcessingMode.Remote;

            // Set report server and report path
            reportViewer1.ServerReport.ReportServerUrl = new
            Uri("https://localhost/reportserver");
            reportViewer1.ServerReport.ReportPath = 
               "/AdventureWorks Sample Reports/Employee Sales Summary";

            // Display the parameters for this report
            DumpParameterInfo(reportViewer1.ServerReport);

            // Set the parameters for this report
            List<ReportParameter> paramList = new List<ReportParameter>();

            paramList.Add(new ReportParameter("EmpID", "288", false));
            paramList.Add(new ReportParameter("ReportMonth", "12", false));
            paramList.Add(
               new ReportParameter("ReportYear", "2003", false));

            this.reportViewer1.ServerReport.SetParameters(paramList);

            // Process and render the report
            reportViewer1.RefreshReport();


        }

        public void DumpParameterInfo(ServerReport sReport)
        {
            ReportParameterInfoCollection pInfo = sReport.GetParameters();

            if (pInfo.Count == 0)
            {
                Console.WriteLine("<No parameters are defined for this report>");
            }
            else
            {
                Console.WriteLine("===========================================================================");
                Console.WriteLine("Parameter Info for " + sReport.ReportPath);

                foreach (ReportParameterInfo p in pInfo)
                {
                    Console.WriteLine("----------------------------------------------------------------------");
                    Console.WriteLine("Parameter Name: {0}", p.Name);
                    Console.WriteLine("Data Type: {0}", p.DataType);
                    Console.WriteLine("State: {0}", p.State);
                    Console.WriteLine("Allow Blank? {0}", p.AllowBlank);
                    Console.WriteLine("Nullable? {0}", p.Nullable);
                    Console.WriteLine("Prompt User? {0}", p.PromptUser);
                    Console.WriteLine("User Prompt: {0}", p.Prompt);
                    Console.WriteLine("Visible? {0}", p.Visible);
                    Console.WriteLine("MultiValued? {0}", p.MultiValue);
                    Console.WriteLine("Default values query-based? {0}", p.AreDefaultValuesQueryBased);
                    Console.Write("Default value(s): ");

                    // Show a list of default values for the report params
                    IList<string> dvList = p.Values;
                    int t;

                    if (dvList.Count != 0)
                    {

                        t = 1;

                        foreach (string dv in dvList)
                        {
                            if (t != dvList.Count)
                            {
                                t++;
                                Console.Write(dv + ", ");
                            }
                            else
                            {
                                if (t == 1)
                                    Console.WriteLine(dv);
                                else
                                    Console.WriteLine("or " + dv);
                            }
                        }
                    }
                    else
                    {
                        Console.WriteLine("<no default values defined>");
                    }

                    Console.WriteLine("Valid values query based? {0}", p.AreValidValuesQueryBased);
                    Console.Write("Valid values: ");

                    // Show a list of valid values for the report params

                    IList<ValidValue> vvList = p.ValidValues;

                    if (vvList != null)
                    {

                        t = 1;

                        foreach (ValidValue vv in vvList)
                        {
                            if (t != vvList.Count)
                            {
                                t++;
                                Console.Write(vv.Value + ", ");
                            }
                            else
                            {
                                if (t == 1)
                                    Console.WriteLine(vv.Value);
                                else
                                    Console.WriteLine("or " + vv.Value);
                            }
                        }
                    }
                    else
                    {
                        Console.WriteLine("<no valid values defined>");
                    }

                    Console.Write("Dependent parameters: ");

                    ReportParameterInfoCollection dpInfo = p.Dependencies;
                    t = 1;

                    if (dpInfo.Count != 0)
                    {

                        foreach (ReportParameterInfo dp in dpInfo)
                        {
                            if (t != dpInfo.Count)
                            {
                                t++;
                                Console.Write(dp.Name + ", ");
                            }
                            else
                            {
                                if (t == 1)
                                    Console.WriteLine(dp.Name);
                                else
                                    Console.WriteLine("or " + dp.Name);
                            }
                        }
                    }
                    else
                    {
                        Console.WriteLine("<no dependent parameters defined>");
                    }
                    
                }
                
            }
            Console.WriteLine("----------------------------------------------------------------------");
        }
    }
}

Inheritance Hierarchy

System.Object
  Microsoft.Reporting.WinForms.ReportParameterInfo

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also

Reference

ReportParameterInfo Members
Microsoft.Reporting.WinForms Namespace