DxReportViewer Class

A document viewer component for reports.

Namespace: DevExpress.Blazor.Reporting

Assembly: DevExpress.Blazor.Reporting.v25.1.Viewer.dll

NuGet Package: DevExpress.Blazor.Reporting.Viewer

Declaration

C#
VB.NET

public class DxReportViewer :
    DxViewer

Public Class DxReportViewer
    Inherits DxViewer

Remarks

The DevExpress Report Viewer for Blazor (<DxReportViewer>) allows you to preview, print, and export reports.

DxReportViewer Overview

Add the Report Viewer to a Project

Follow the steps below to add the Report Viewer component to an application:

Use a DevExpress Project Template to create a new Blazor application. If you use a Microsoft project template or already have a Blazor project, configure your project to incorporate DevExpress Blazor components.
Install the NuGet DevExpress.Blazor.Reporting.Viewer package.
Add the @using DevExpress.Blazor.Reporting directive to the _Imports.razor page.

Add the following code to the application startup file:

//...
var builder = WebApplication.CreateBuilder(args);

builder.Services.AddDevExpressServerSideBlazorReportViewer();

var app = builder.Build();

Add the <DxReportViewer>…</DxReportViewer> markup to a Razor page.

Enable interactivity for DevExpress components:
- Make sure the required interactive services are registered in the Program.cs file.
- Add the corresponding render mode attribute to a component’s page.
```
@page "/Viewer"
@rendermode InteractiveServer

@using DevExpress.Blazor.Reporting

<h3>Report Viewer</h3>

<DxReportViewer @ref="reportViewer">
</DxReportViewer>

@code {
    DxReportViewer? reportViewer;
}
```

Link stylesheets to the page:

<link rel="stylesheet" href="_content/DevExpress.Blazor.Reporting.Viewer/css/dx-blazor-reporting-components.css">

Specify a report to open.
Customize the Report Viewer’s elements (refer to the sections below).

For more information on how to add a Report Viewer component to a Blazor application, refer to the following topics:

Specify a Report to Open

Use the Report property:

@using DevExpress.Blazor.Reporting
@using DevExpress.XtraReports;

<DxReportViewer @ref="reportViewer" Report="@Report">
</DxReportViewer>

@code {
    DxReportViewer reportViewer { get; set; }
    IReport Report { get; set; }

    protected override async Task OnInitializedAsync()
    {
        Report = new TestReport();
    }
}

Note

A report may contain the XRSubreport control with the report source specified by name (a string). In this situation, you should implement and register the IReportProvider or IReportProviderAsync service that converts a report name to a report instance.

Handle the OnCustomizeToolbar event to add a new toolbar item or hide the existing item. The following code adds a new toolbar button:

@page "/toolbar/"

@using DevExpress.Blazor.Reporting
@using DevExpress.XtraReports.UI
@using BlazorCustomization.PredefinedReports
@using DevExpress.Blazor.Reporting.Models

@inject IJSRuntime JsRuntime

<div @ref="viewerComponent" style="width: 100%; height: 1000px;">
    <DxReportViewer @ref="reportViewer"
                    OnCustomizeToolbar="OnCustomizeToolbar"
                    Report="Report" />
</div>

@code {
    DxReportViewer reportViewer;
    XtraReport Report = new TableReport();
    private ElementReference viewerComponent;

    void OnCustomizeToolbar(ToolbarModel toolbarModel)
    {
        toolbarModel.AllItems.Add(new ToolbarItem()
        {
            // Use Open Iconic's icon.
            IconCssClass = "oi oi-command",
            Text = "Full Screen",
            AdaptiveText = "Full Screen",
            AdaptivePriority = 1,
            Click = async (args) =>
            {
                await JsRuntime.InvokeVoidAsync("customApi.requestFullscreen", viewerComponent);
            }
        });
    }

}

The customized toolbar is shown in the image below.

DxReportViewer Custom Toolbar