ASP.NET Core Excel Viewer Control
How to open, view a Excel .xlsx document online in web browser without Office, interop using C# ASP.NET

EdgePDF is an ASP.NET PDF viewer and editor web control. You could also view Microsoft Office Excel file in web browser with EdgePDF using C# ASP.NET

• Open, read a Excel file from server side file system
• EdgePDF will automatically convert loaded Excel Workbook or selected Sheets to PDF document in ASP.NET
• View, comment Excel file online in web browser
• Support ASP.NET Core, ASP.NET MVC (.net framework) web app, deploy to Azure web service

How to view a Excel file programmatically in asp.net core using C#

1. Download EdgePDF asp.net PDF viewer web control
2. Install EdgePDF demo project in IIS
3. Follow step by step tutorial

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Preparation

To run the following tutorial successfully, we need the following setup ready.

1. For ASP.NET Core web app: Setup EdgePDF
2. For ASP.NET Core MVC web app: Setup EdgePDF
3. For ASP.NET (.net framework): Setup EdgePDF on IIS
4. A demo Office Excel document in folder C:\temp\excel-1.xlsx

How to read, view a Office Excel file online in web browser in ASP.NET C#?

The following steps and C# demo source code will help to setup a demo ASP.NET project, which allows you to read, view a Microsoft Excel file in web browser using ASP.NET C# code.

After you have completed the following guide, you can open, view a Office Excel file online in web browser through url (a sample url http://localhost:56643/?yourtarget=excel-1.xlsx)

• For ASP.NET Core web app, open file UserCommandProcessMiddleware.cs from /DemoProjects/EdgePDF for ASP.NET Core/


• For ASP.NET (.net framework) project, open file UserCommandProcessHandler.ashx from {EdgePDF demo project}/RasterEdge_Resource_Files/


• Go to method FileProcess()
• Create a new byte[] object with viewed Excel file in byte array
• Call method REProcessControl.PageLoadFile() to load, view Excel file in EdgePDF. The Excel file (excel-1.xlsx) has been converted into PDF file and rendered in EdgePDF online in web browser

    public override PDFWebDocument FileProcess()
    {
        HttpRequest request = this.Context.Request;

        if (!String.IsNullOrEmpty(request.QueryString["yourtarget"]))
        {
            String docid = request.QueryString["yourtarget"];

            byte[] dataBytes = System.IO.File.ReadAllBytes(@"C:\\temp\" + docid);
                
            return REProcessControl.PageLoadFile(request, this.Manager, dataBytes, docid);
        }
        else
        {
            Logger.Log(">>> Unknown load file mode. Load default file defined in Web.config.", LogType.DEBUG);

            // load default file. defined in Web.config
            return REProcessControl.PageLoadFile(request, this.Manager, "", LoadType.Server);
        }
    }