IReportController

The IReportController interface declares the Web API controller action methods that process RDL, RDLC, and SSRS reports and handle requests from the Bold Reports® ASP.NET Core Report Viewer. The IReportController declares the following action methods.

Methods Description
GetResource Action (HttpGet) method to get a resource for the report.
PostReportAction Action (HttpPost) method to post the request for report process.
OnInitReportOptions Report initialization method that is triggered when the report begins to be processed.
OnReportLoaded Report loaded method is triggered when the report and sub report starts loading.

ReportHelper

The ReportHelper class contains helper methods that process Post or Get requests from the Report Viewer control and return the response to the Report Viewer control. The ReportHelper class has the following methods.

Methods Description
GetResource Returns the report resource to the requested key.
ProcessReport Processes the report request and returns the result. 
public class ReportViewerController : Controller, IReportController
{
    // Report viewer requires a memory cache to store the information of consecutive client request and
    // have the rendered report viewer information in server.
    private Microsoft.Extensions.Caching.Memory.IMemoryCache _cache;

    // IWebHostEnvironment used with sample to get the application data from wwwroot.
    private Microsoft.AspNetCore.Hosting.IWebHostEnvironment _hostingEnvironment;

    // Post action to process the report from server based json parameters and send the result back to the client.
    public ReportViewerController(Microsoft.Extensions.Caching.Memory.IMemoryCache memoryCache,
        Microsoft.AspNetCore.Hosting.IWebHostEnvironment hostingEnvironment)
    {
        _cache = memoryCache;
        _hostingEnvironment = hostingEnvironment;
    }

    // Post action to process the report from server based json parameters and send the result back to the client.
    [HttpPost]
    public object PostReportAction([FromBody] Dictionary<string, object> jsonArray)
    {
        return ReportHelper.ProcessReport(jsonArray, this, this._cache);
    }

    // Method will be called to initialize the report information to load the report with ReportHelper for processing.
    [NonAction]
    public void OnInitReportOptions(ReportViewerOptions reportOption)
    {
        string basePath = _hostingEnvironment.WebRootPath;
        // Here, we have loaded the sample report from application the folder wwwroot. Sample.rdl should be there in wwwroot application folder.
        FileStream inputStream = new FileStream(basePath + @"\Resources\" + reportOption.ReportModel.ReportPath, FileMode.Open, FileAccess.Read);
        MemoryStream reportStream = new MemoryStream();
        inputStream.CopyTo(reportStream);
        reportStream.Position = 0;
        inputStream.Close();
        reportOption.ReportModel.Stream = reportStream;
    }

    // Method will be called when reported is loaded with internally to start to layout process with ReportHelper.
    [NonAction]
    public void OnReportLoaded(ReportViewerOptions reportOption)
    {
    }

    //Get action for getting resources from the report
    [ActionName("GetResource")]
    [AcceptVerbs("GET")]
    // Method will be called from Report Viewer client to get the image src for Image report item.
    public object GetResource(ReportResource resource)
    {
        return ReportHelper.GetResource(resource, this, _cache);
    }

    [HttpPost]
    public object PostFormReportAction()
    {
        return ReportHelper.ProcessReport(null, this, _cache);
    }
}

See also