How to: Access the Report Preview Control (ASP.NET Core Blazor)（如何：访问报表预览控件（ASP.NET Core Blazor））

This example accesses the DxDocumentViewer component that ASP.NET Core Blazor XAF applications use to display reports.
此示例访问ASP.NET Core Blazor XAF应用程序用于显示报表的DxDocumentViewer组件。

When a user previews a report, an XAF ASP.NET Core Blazor application opens a Detail View that contains a ReportViewerViewItem. Follow the steps below to access this View Item and its component:
当用户预览报表时，XAF ASP.NET Core Blazor 应用程序会打开一个包含 ReportViewerViewItem 的明细视图。请按照以下步骤访问此视图项及其组件：

1.Add the Reports V2 Module to your application. For more information, refer to the following topic: Add Reports V2 Module to an Existing XAF Application.
将报表V2模块添加到您的应用程序中。有关更多信息，请参阅以下主题：将报表V2模块添加到现有XAF应用程序。

2.Create a Detail View Controller and specify the TargetViewId as ReportsBlazorModuleV2.ReportViewerDetailViewName.
创建一个详情视图控制器，并将TargetViewId指定为ReportsBlazorModuleV2.ReportViewerDetailViewName。

3.Override the OnActivated method and access the Report Viewer’s control as demonstrated in the following code snippet:
重写OnActivated方法，并按以下代码片段所示访问报表查看器的控件：

C#
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.ReportsV2.Blazor;
using DevExpress.XtraReports;




namespace YourSolutionName.Blazor.Server.Controllers;




public class AccessReportViewerController : ViewController<DetailView> {




    public AccessReportViewerController() {
        TargetViewId = ReportsBlazorModuleV2.ReportViewerDetailViewName;
    }




    protected override void OnActivated() {
        base.OnActivated();
        View.CustomizeViewItemControl<ReportViewerViewItem>(this, CustomizeReportViewerViewItem);
    }




    private void CustomizeReportViewerViewItem(ReportViewerViewItem reportViewerViewItem) {
        //Access the Report Viewer's control.
        IReport report = reportViewerViewItem.ReportViewerModel.Report;
        // ...
    }
}