Create, read, and edit Excel files in Xamarin

6 Nov 202324 minutes to read

Syncfusion Excel library for Xamarin platform can be used to create, read, edit Excel files. This also convert Excel files to PDF.

Create a simple Excel report

The below steps illustrates creating an simple Invoice formatted Excel document in Xamarin application.

Step 1: Create a new C# Xamarin.Forms application project.

Step 2: Select a project template and required platforms to deploy the application. In this application the portable assemblies to be shared across multiple platforms, the .NET Standard code sharing strategy has been selected. For more details about code sharing refer here.

NOTE

If .NET Standard is not available in the code sharing strategy, the Portable Class Library (PCL) can be selected.

Step 3: Install the Syncfusion.Xamarin.XlsIO NuGet package as reference to your .NET Standard applications from NuGet.org.

NOTE

Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, you also have to add “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to know about registering Syncfusion license key in your applications to use our components.

Step 4: Add new Forms XAML page in portable project If there is no XAML page is defined in the App class. Otherwise proceed to the next step.

i)	To add the new XAML page, right click on the project and select Add > New Item and add a Forms XAML Page from the list. Name it as MainXamlPage.

ii)	In App class of portable project (App.cs), replace the existing constructor of App class with the code snippet given below which invokes the MainXamlPage.

C#

public App()
   {
     // The root page of your application
     MainPage = new MainXamlPage();
   }

VB.NET

Public Sub New()
     'The root page of your application
     MainPage = New MainXamlPage()
   End Sub

Step 5: In the MainXamlPage.xaml add new button as shown below.

XAML

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                x:Class="GettingStarted. MainXamlPage">
   <StackLayout VerticalOptions="Center">
   
   <Button Text="Generate Document" Clicked="OnButtonClicked" HorizontalOptions="Center"/>
   
   </StackLayout> </ContentPage>

Step 6: Include the following namespace in the MainXamlPage.xaml.cs file.

C#

using Syncfusion.XlsIO;
   using System.Reflection;
   using Color = Syncfusion.Drawing.Color;

VB.NET

Imports Syncfusion.XlsIO
   Imports System.Reflection
   Imports Color = Syncfusion.Drawing.Color

Step 7: Include the below code snippet in the click event of the button in MainXamlPage.xaml.cs, to create an Excel file and save it in a stream.

C#

void OnButtonClicked(object sender, EventArgs args)
   {
     //Create an instance of ExcelEngine.
     using (ExcelEngine excelEngine = new ExcelEngine())
     {
       IApplication application = excelEngine.Excel;
       application.DefaultVersion = ExcelVersion.Xlsx;
   
       //Create a workbook with a worksheet
       IWorkbook workbook = excelEngine.Excel.Workbooks.Create(1);
   
       //Access first worksheet from the workbook instance.
       IWorksheet worksheet = workbook.Worksheets[0];
   
       Assembly executingAssembly = typeof(MainPage).GetTypeInfo().Assembly;
       Stream inputStream = executingAssembly.GetManifestResourceStream("GettingStarted.AdventureCycles-Logo.png");
   
       //Add a picture
       IPictureShape shape = worksheet.Pictures.AddPicture(1, 1, inputStream, 20, 20);
   
       //Disable gridlines in the worksheet
       worksheet.IsGridLinesVisible = false;
   
       //Enter values to the cells from A3 to A5
       worksheet.Range["A3"].Text = "46036 Michigan Ave";
       worksheet.Range["A4"].Text = "Canton, USA";
       worksheet.Range["A5"].Text = "Phone: [phone]";
   
       //Make the text bold
       worksheet.Range["A3:A5"].CellStyle.Font.Bold = true;
   
       //Merge cells
       worksheet.Range["D1:E1"].Merge();
   
       //Enter text to the cell D1 and apply formatting.
       worksheet.Range["D1"].Text = "INVOICE";
       worksheet.Range["D1"].CellStyle.Font.Bold = true;
       worksheet.Range["D1"].CellStyle.Font.RGBColor = Color.FromArgb(42, 118, 189);
       worksheet.Range["D1"].CellStyle.Font.Size = 35;
   
       //Apply alignment in the cell D1
       worksheet.Range["D1"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignRight;
       worksheet.Range["D1"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop;
   
       //Enter values to the cells from D5 to E8
       worksheet.Range["D5"].Text = "INVOICE#";
       worksheet.Range["E5"].Text = "DATE";
       worksheet.Range["D6"].Number = 1028;
       worksheet.Range["E6"].Value = "12/31/2018";
       worksheet.Range["D7"].Text = "CUSTOMER ID";
       worksheet.Range["E7"].Text = "TERMS";
       worksheet.Range["D8"].Number = 564;
       worksheet.Range["E8"].Text = "Due Upon Receipt";
   
       //Apply RGB backcolor to the cells from D5 to E8
       worksheet.Range["D5:E5"].CellStyle.Color = Color.FromArgb(42, 118, 189);
       worksheet.Range["D7:E7"].CellStyle.Color = Color.FromArgb(42, 118, 189);
   
       //Apply known colors to the text in cells D5 to E8
       worksheet.Range["D5:E5"].CellStyle.Font.Color = ExcelKnownColors.White;
       worksheet.Range["D7:E7"].CellStyle.Font.Color = ExcelKnownColors.White;
   
       //Make the text as bold from D5 to E8
       worksheet.Range["D5:E8"].CellStyle.Font.Bold = true;
   
       //Apply alignment to the cells from D5 to E8
       worksheet.Range["D5:E8"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
       worksheet.Range["D5:E5"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
       worksheet.Range["D7:E7"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
       worksheet.Range["D6:E6"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop;
   
       //Enter value and applying formatting in the cell A7
       worksheet.Range["A7"].Text = "  BILL TO";
       worksheet.Range["A7"].CellStyle.Color = Color.FromArgb(42, 118, 189);
       worksheet.Range["A7"].CellStyle.Font.Bold = true;
       worksheet.Range["A7"].CellStyle.Font.Color = ExcelKnownColors.White;
   
       //Apply alignment
       worksheet.Range["A7"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft;
       worksheet.Range["A7"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
   
       //Enter values in the cells A8 to A12
       worksheet.Range["A8"].Text = "Steyn";
       worksheet.Range["A9"].Text = "Great Lakes Food Market";
       worksheet.Range["A10"].Text = "20 Whitehall Rd";
       worksheet.Range["A11"].Text = "North Muskegon,USA";
       worksheet.Range["A12"].Text = "[phone]";
   
       //Create a Hyperlink for e-mail in the cell A13
       IHyperLink hyperlink = worksheet.HyperLinks.Add(worksheet.Range["A13"]);
       hyperlink.Type = ExcelHyperLinkType.Url;
       hyperlink.Address = "[e-mail]";
       hyperlink.ScreenTip = "Send Mail";
   
       //Enter details of products and prices
       worksheet.Range["A15"].Text = "  DESCRIPTION";
       worksheet.Range["C15"].Text = "QTY";
       worksheet.Range["D15"].Text = "UNIT PRICE";
       worksheet.Range["E15"].Text = "AMOUNT";
       worksheet.Range["A16"].Text = "Cabrales Cheese";
       worksheet.Range["A17"].Text = "Chocos";
       worksheet.Range["A18"].Text = "Pasta";
       worksheet.Range["A19"].Text = "Cereals";
       worksheet.Range["A20"].Text = "Ice Cream";
       worksheet.Range["C16"].Number = 3;
       worksheet.Range["C17"].Number = 2;
       worksheet.Range["C18"].Number = 1;
       worksheet.Range["C19"].Number = 4;
       worksheet.Range["C20"].Number = 3;
       worksheet.Range["D16"].Number = 21;
       worksheet.Range["D17"].Number = 54;
       worksheet.Range["D18"].Number = 10;
       worksheet.Range["D19"].Number = 20;
       worksheet.Range["D20"].Number = 30;
       worksheet.Range["D23"].Text = "Total";
   
       //Apply number format
       worksheet.Range["D16:E22"].NumberFormat = "$.00";
       worksheet.Range["E23"].NumberFormat = "$.00";
   
       //Merge column A and B from row 15 to 22
       worksheet.Range["A15:B15"].Merge();
       worksheet.Range["A16:B16"].Merge();
       worksheet.Range["A17:B17"].Merge();
       worksheet.Range["A18:B18"].Merge();
       worksheet.Range["A19:B19"].Merge();
       worksheet.Range["A20:B20"].Merge();
       worksheet.Range["A21:B21"].Merge();
       worksheet.Range["A22:B22"].Merge();
   
       //Apply incremental formula for column Amount by multiplying Qty and UnitPrice
       application.EnableIncrementalFormula = true;
       worksheet.Range["E16:E20"].Formula = "=C16*D16";
   
       //Formula for Sum the total
       worksheet.Range["E23"].Formula = "=SUM(E16:E22)";
   
       //Apply borders
       worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].LineStyle = ExcelLineStyle.Thin;
       worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].LineStyle = ExcelLineStyle.Thin;
       worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].Color = ExcelKnownColors.Grey_25_percent;
       worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].Color = ExcelKnownColors.Grey_25_percent;
       worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].LineStyle = ExcelLineStyle.Thin;
       worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].LineStyle = ExcelLineStyle.Thin;
       worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].Color = ExcelKnownColors.Black;
       worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].Color = ExcelKnownColors.Black;
   
       //Apply font setting for cells with product details
       worksheet.Range["A3:E23"].CellStyle.Font.FontName = "Arial";
       worksheet.Range["A3:E23"].CellStyle.Font.Size = 10;
       worksheet.Range["A15:E15"].CellStyle.Font.Color = ExcelKnownColors.White;
       worksheet.Range["A15:E15"].CellStyle.Font.Bold = true;
       worksheet.Range["D23:E23"].CellStyle.Font.Bold = true;
   
       //Apply cell color
       worksheet.Range["A15:E15"].CellStyle.Color = Color.FromArgb(42, 118, 189);
   
       //Apply alignment to cells with product details
       worksheet.Range["A15"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft;
       worksheet.Range["C15:C22"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
       worksheet.Range["D15:E15"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
   
       //Apply row height and column width to look good
       worksheet.Range["A1"].ColumnWidth = 36;
       worksheet.Range["B1"].ColumnWidth = 11;
       worksheet.Range["C1"].ColumnWidth = 8;
       worksheet.Range["D1:E1"].ColumnWidth = 18;
       worksheet.Range["A1"].RowHeight = 47;
       worksheet.Range["A2"].RowHeight = 15;
       worksheet.Range["A3:A4"].RowHeight = 15;
       worksheet.Range["A5"].RowHeight = 18;
       worksheet.Range["A6"].RowHeight = 29;
       worksheet.Range["A7"].RowHeight = 18;
       worksheet.Range["A8"].RowHeight = 15;
       worksheet.Range["A9:A14"].RowHeight = 15;
       worksheet.Range["A15:A23"].RowHeight = 18;
   
       //Save the workbook to stream in xlsx format. 
       MemoryStream stream = new MemoryStream();
       workbook.SaveAs(stream);
   
       workbook.Close();
   
       //Save the stream as a file in the device and invoke it for viewing
       Xamarin.Forms.DependencyService.Get<ISave>().SaveAndView("GettingStared.xlsx", "application/msexcel", stream);
     }
   }

VB.NET

Private Sub OnButtonClicked(ByVal sender As Object, ByVal args As EventArgs)
   'Create an instance of ExcelEngine
   Using excelEngine As ExcelEngine = New ExcelEngine()
     Dim application As IApplication = excelEngine.Excel
     application.DefaultVersion = ExcelVersion.Xlsx
   
     'Create a workbook
     Dim workbook As IWorkbook = application.Workbooks.Create(1)
     Dim worksheet As IWorksheet = workbook.Worksheets(0)
   
     'Adding a picture
     Dim executingAssembly As Assembly = GetType(MainPage).GetTypeInfo().Assembly
     Dim inputStream As Stream = executingAssembly.GetManifestResourceStream("GettingStarted.AdventureCycles-Logo.png")
     Dim shape As IPictureShape = worksheet.Pictures.AddPicture(1, 1, inputStream, 20, 20)
   
     'Disable gridlines in the worksheet
     worksheet.IsGridLinesVisible = False
   
     'Enter values to the cells from A3 to A5
     worksheet.Range("A3").Text = "46036 Michigan Ave"
     worksheet.Range("A4").Text = "Canton, USA"
     worksheet.Range("A5").Text = "Phone: [phone]"
   
     'Make the text bold
     worksheet.Range("A3:A5").CellStyle.Font.Bold = True
   
     'Merge cells
     worksheet.Range("D1:E1").Merge()
   
     'Enter text to the cell D1 and apply formatting.
     worksheet.Range("D1").Text = "INVOICE"
     worksheet.Range("D1").CellStyle.Font.Bold = True
     worksheet.Range("D1").CellStyle.Font.RGBColor = Color.FromArgb(42, 118, 189)
     worksheet.Range("D1").CellStyle.Font.Size = 35
   
     'Apply alignment in the cell D1
     worksheet.Range("D1").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignRight
     worksheet.Range("D1").CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop
   
     'Enter values to the cells from D5 to E8
     worksheet.Range("D5").Text = "INVOICE#"
     worksheet.Range("E5").Text = "DATE"
     worksheet.Range("D6").Number = 1028
     worksheet.Range("E6").Value = "12/31/2018"
     worksheet.Range("D7").Text = "CUSTOMER ID"
     worksheet.Range("E7").Text = "TERMS"
     worksheet.Range("D8").Number = 564
     worksheet.Range("E8").Text = "Due Upon Receipt"
   
     'Apply RGB back color to the cells from D5 to E8
     worksheet.Range("D5:E5").CellStyle.Color = Color.FromArgb(42, 118, 189)
     worksheet.Range("D7:E7").CellStyle.Color = Color.FromArgb(42, 118, 189)
   
     'Apply known colors to the text in cells D5 to E8
     worksheet.Range("D5:E5").CellStyle.Font.Color = ExcelKnownColors.White
     worksheet.Range("D7:E7").CellStyle.Font.Color = ExcelKnownColors.White
   
     'Make the text as bold from D5 to E8
     worksheet.Range("D5:E8").CellStyle.Font.Bold = True
   
     'Apply alignment to the cells from D5 to E8
     worksheet.Range("D5:E8").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
     worksheet.Range("D5:E5").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
     worksheet.Range("D7:E7").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
     worksheet.Range("D6:E6").CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop
   
     'Enter value and applying formatting in the cell A7
     worksheet.Range("A7").Text = "  BILL TO"
     worksheet.Range("A7").CellStyle.Color = Color.FromArgb(42, 118, 189)
     worksheet.Range("A7").CellStyle.Font.Bold = True
     worksheet.Range("A7").CellStyle.Font.Color = ExcelKnownColors.White
   
     'Apply alignment
     worksheet.Range("A7").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft
     worksheet.Range("A7").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
   
     'Enter values in the cells A8 to A12
     worksheet.Range("A8").Text = "Steyn"
     worksheet.Range("A9").Text = "Great Lakes Food Market"
     worksheet.Range("A10").Text = "20 Whitehall Rd"
     worksheet.Range("A11").Text = "North Muskegon,USA"
     worksheet.Range("A12").Text = "[phone]"
   
     'Create a Hyperlink for e-mail in the cell A13
     Dim hyperlink As IHyperLink = worksheet.HyperLinks.Add(worksheet.Range("A13"))
     hyperlink.Type = ExcelHyperLinkType.Url
     hyperlink.Address = "[e-mail]"
     hyperlink.ScreenTip = "Send Mail"
   
     'Merge column A and B from row 15 to 22
     worksheet.Range("A15:B15").Merge()
     worksheet.Range("A16:B16").Merge()
     worksheet.Range("A17:B17").Merge()
     worksheet.Range("A18:B18").Merge()
     worksheet.Range("A19:B19").Merge()
     worksheet.Range("A20:B20").Merge()
     worksheet.Range("A21:B21").Merge()
     worksheet.Range("A22:B22").Merge()
   
     'Enter details of products and prices
     worksheet.Range("A15").Text = "  DESCRIPTION"
     worksheet.Range("C15").Text = "QTY"
     worksheet.Range("D15").Text = "UNIT PRICE"
     worksheet.Range("E15").Text = "AMOUNT"
     worksheet.Range("A16").Text = "Cabrales Cheese"
     worksheet.Range("A17").Text = "Chocos"
     worksheet.Range("A18").Text = "Pasta"
     worksheet.Range("A19").Text = "Cereals"
     worksheet.Range("A20").Text = "Ice Cream"
     worksheet.Range("C16").Number = 3
     worksheet.Range("C17").Number = 2
     worksheet.Range("C18").Number = 1
     worksheet.Range("C19").Number = 4
     worksheet.Range("C20").Number = 3
     worksheet.Range("D16").Number = 21
     worksheet.Range("D17").Number = 54
     worksheet.Range("D18").Number = 10
     worksheet.Range("D19").Number = 20
     worksheet.Range("D20").Number = 30
     worksheet.Range("D23").Text = "Total"
   
     'Apply number format
     worksheet.Range("D16:E22").NumberFormat = "$.00"
     worksheet.Range("E23").NumberFormat = "$.00"
   
     'Apply incremental formula for column Amount by multiplying Qty and UnitPrice
     application.EnableIncrementalFormula = True
     worksheet.Range("E16:E20").Formula = "=C16*D16"
   
     'Formula for Sum the total
     worksheet.Range("E23").Formula = "=SUM(E16:E22)"
   
     'Apply borders
     worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeTop).LineStyle = ExcelLineStyle.Thin
     worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).LineStyle = ExcelLineStyle.Thin
     worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeTop).Color = ExcelKnownColors.Grey_25_percent
     worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).Color = ExcelKnownColors.Grey_25_percent
     worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeTop).LineStyle = ExcelLineStyle.Thin
     worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).LineStyle = ExcelLineStyle.Thin
     worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeTop).Color = ExcelKnownColors.Black
     worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).Color = ExcelKnownColors.Black
   
     'Apply font setting for cells with product details
     worksheet.Range("A3:E23").CellStyle.Font.FontName = "Arial"
     worksheet.Range("A3:E23").CellStyle.Font.Size = 10
     worksheet.Range("A15:E15").CellStyle.Font.Color = ExcelKnownColors.White
     worksheet.Range("A15:E15").CellStyle.Font.Bold = True
     worksheet.Range("D23:E23").CellStyle.Font.Bold = True
   
     'Apply cell color
     worksheet.Range("A15:E15").CellStyle.Color = Color.FromArgb(42, 118, 189)
   
     'Apply alignment to cells with product details
     worksheet.Range("A15").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft
     worksheet.Range("C15:C22").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
     worksheet.Range("D15:E15").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
   
     'Apply row height and column width to look good
     worksheet.Range("A1").ColumnWidth = 36
     worksheet.Range("B1").ColumnWidth = 11
     worksheet.Range("C1").ColumnWidth = 8
     worksheet.Range("D1:E1").ColumnWidth = 18
     worksheet.Range("A1").RowHeight = 47
     worksheet.Range("A2").RowHeight = 15
     worksheet.Range("A3:A4").RowHeight = 15
     worksheet.Range("A5").RowHeight = 18
     worksheet.Range("A6").RowHeight = 29
     worksheet.Range("A7").RowHeight = 18
     worksheet.Range("A8").RowHeight = 15
     worksheet.Range("A9:A14").RowHeight = 15
     worksheet.Range("A15:A23").RowHeight = 18
   
     'Saving the Excel to the MemoryStream 			
     Dim stream As MemoryStream = New MemoryStream()
     workbook.SaveAs(stream)
   
     workbook.Close()
   
     'Save the stream as a file in the device and invoke it for viewing
     Xamarin.Forms.DependencyService.[Get](Of ISave)().SaveAndView("GettingStared.xlsx", "application/msexcel", stream)
   End Using

Step 8: Compile and execute the application. Now this application creates a simple Excel document.

A complete working example of how to create an Excel file in Xamarin in C# is present on this GitHub page.

By executing the program, you will get the Excel file as below.

Read and Edit Excel file

The below code illustrates how to read and edit an Excel file in Xamarin.

NOTE

Please include the Excel document in the Xamarin project and set the Build Action property of the document as Embedded Resource.

C#

void btnCreate_Click(object sender, System.EventArgs e)
{
  ExcelEngine excelEngine = new ExcelEngine();
  IApplication application = excelEngine.Excel;
  application.DefaultVersion = ExcelVersion.Xlsx;

  string resourcePath = "SampleBrowser.Samples.XlsIO.Template.Sample.xlsx";
  //"App" is the class of Portable project.
  Assembly assembly = typeof(App).GetTypeInfo().Assembly;
  Stream fileStream = assembly.GetManifestResourceStream(resourcePath);

  //Opens the workbook 
  IWorkbook workbook = application.Workbooks.Open(fileStream);

  //Access first worksheet from the workbook.
  IWorksheet worksheet = workbook.Worksheets[0];

  //Set Text in cell A3.
  worksheet.Range["A3"].Text ="Hello World";

  //Access a cell value from Excel
  var value = worksheet.Range["A1"].Value;

  MemoryStream stream = new MemoryStream();
  workbook.SaveAs(stream);
  workbook.Close();
  excelEngine.Dispose();

  //Save the stream into XLSX file
  Xamarin.Forms.DependencyService.Get<ISave>().SaveAndView("sample.xlsx","application/msexcel", stream);
}

A complete working example of how to read and edit an Excel file in Xamarin in C# is present on this GitHub page.

NOTE

SaveAndView is helper method to save the stream as a physical file and open the file in default viewer. The operation varies between Windows Phone, Android and iOS platforms as described in the code samples below.

Click here to explore the rich set of Syncfusion Excel library (XlsIO) features.

An online sample link to create an Excel document in ASP.NET Core.

Helper Files

Download the helper files from this link and add them into the mentioned project. These helper files allow you to save the stream as a physical file and open the file for viewing.

Project	File Name	Summary
Portable project	ISave.cs	Represent the base interface for save operation
iOS Project	SaveIOS.cs PreviewControllerDS.cs	Save implementation for iOS device Helper class for viewing the Excel file in iOS device
Android project	SaveAndroid.cs	Save implementation for Android device
WinPhone project	SaveWinPhone.cs	Save implementation for Windows Phone device
UWP project	SaveWindows.cs	Save implementation for UWP device.
Windows(8.1) project	SaveWindows81.cs	Save implementation for WinRT device.

The respective code snippets are given below also, for reference.

ISave class in portable project

C# [Cross-platform]

using System.IO;
using System.Threading.Tasks;

public interface ISave
{
  //Method to save document as a file and view the saved document
  Task SaveAndView(string filename, string contentType, MemoryStream stream);
}

Save and View the Excel document in windows

C# [Cross-platform]

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Windows.Storage;
using Windows.Storage.Pickers;
using Xamarin.Forms.Platform.UWP;

[assembly: Dependency(typeof(SaveWindows))]

class SaveWindows: ISave
{
  public async Task SaveAndView(string filename, string contentType, MemoryStream stream)
  {
    //save the stream into the file. 
    if (Device.Idiom != TargetIdiom.Desktop)
    {
      StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
      StorageFile outFile = await local.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
      using (Stream outStream = await outFile.OpenStreamForWriteAsync())
      {
        outStream.Write(stream.ToArray(), 0, (int)stream.Length);
      }
      if (contentType != "application/html")
        await Windows.System.Launcher.LaunchFileAsync(outFile);
    }
    else
    {
      StorageFile storageFile = null;
      FileSavePicker savePicker = new FileSavePicker();
      savePicker.SuggestedStartLocation = PickerLocationId.Desktop;
      savePicker.SuggestedFileName = filename;
      switch (contentType)
      {
        case "application/vnd.openxmlformats-officedocument.presentationml.presentation":
          savePicker.FileTypeChoices.Add("PowerPoint Presentation", new List<string>() { ".pptx", });
          break;

        case "application/msexcel":
          savePicker.FileTypeChoices.Add("Excel Files", new List<string>() { ".xlsx", });
          break;

        case "application/msword":
          savePicker.FileTypeChoices.Add("Word Document", new List<string>() { ".docx" });
          break;

        case "application/pdf":
          savePicker.FileTypeChoices.Add("Adobe PDF Document", new List<string>() { ".pdf" });
          break;

        case "application/html":
          savePicker.FileTypeChoices.Add("HTML Files", new List<string>() { ".html" });
          break;
      }
      storageFile = await savePicker.PickSaveFileAsync();

      using (Stream outStream = await storageFile.OpenStreamForWriteAsync())
      {
        outStream.Write(stream.ToArray(), 0, (int)stream.Length);
      }

      //Invoke the saved file for Viewing.
      await Windows.System.Launcher.LaunchFileAsync(storageFile);
    }
  }
}

Save and View the Excel document in Android

C# [Cross-platform]

using System;
using System.IO;
using GettingStarted.Droid;
using Android.Content;
using Java.IO;
using Xamarin.Forms;
using System.Threading.Tasks;

[assembly: Dependency(typeof(SaveAndroid))]

class SaveAndroid: ISave
{
  //Method to save document as a file in Android and view the saved document
  public async Task SaveAndView(string fileName, String contentType, MemoryStream stream)
  {
    string root = null;
    //Get the root path in android device.
    if (Android.OS.Environment.IsExternalStorageEmulated)
    {
      root = Android.OS.Environment.ExternalStorageDirectory.ToString();
    }
    else
      root = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

    //Create directory and file 
    Java.IO.File myDir = new Java.IO.File(root + "/Syncfusion");
    myDir.Mkdir();

    Java.IO.File file = new Java.IO.File(myDir, fileName);

    //Remove if the file exists
    if (file.Exists()) file.Delete();

    //Write the stream into the file
    FileOutputStream outs = new FileOutputStream(file);
    outs.Write(stream.ToArray());

    outs.Flush();
    outs.Close();

    //Invoke the created file for viewing
    if (file.Exists())
    {
      Android.Net.Uri path = Android.Net.Uri.FromFile(file);
      string extension = Android.Webkit.MimeTypeMap.GetFileExtensionFromUrl(Android.Net.Uri.FromFile(file).ToString());
      string mimeType = Android.Webkit.MimeTypeMap.Singleton.GetMimeTypeFromExtension(extension);
      Intent intent = new Intent(Intent.ActionView);
      intent.SetDataAndType(path, mimeType);
      Forms.Context.StartActivity(Intent.CreateChooser(intent, "Choose App"));
    }
  }
}

NOTE

Introduced a new runtime permission model for the Android SDK version 23 and above. So, include the following code for enabling the Android file provider to save and view the generated PDF document.

Create a new XML file with the name of provider_path.xml under the Resources folder of Android project and add the following code in it. Eg: Resources/xml/provider_path.xml

XAML

<?xml version="1.0" encoding="UTF-8" ?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
   <external-path name="external_files" path="."/>
</paths>

Add the following code to the AndroidManifest.xml file located under Properties/AndroidManifest.xml.

XAML

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.CreateXlsIOSample">
   <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="27" />
   <application android:label="CreateXlsIOSample.Android">
      <provider android:name="androidx.core.content.FileProvider"
         android:authorities="${applicationId}.provider"
         android:exported="false"
         android:grantUriPermissions="true">
         <meta-data android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths" />
      </provider>
   </application>
</manifest>

Save and View the Excel document in iOS

C# [Cross-platform]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using Xamarin.Forms;
using GettingStarted.iOS;
using UIKit;
using QuickLook;

[assembly: Dependency(typeof(SaveIOS))]

class SaveIOS: ISave
{
  //Method to save document as a file and view the saved document
  public async Task SaveAndView(string filename, string contentType, MemoryStream stream)
  {
    //Get the root path in iOS device.
    string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
    string filePath = Path.Combine(path, filename);

    //Create a file and write the stream into it.
    FileStream fileStream = File.Open(filePath, FileMode.Create);
    stream.Position = 0;
    stream.CopyTo(fileStream);
    fileStream.Flush();
    fileStream.Close();

    //Invoke the saved document for viewing
    UIViewController currentController = UIApplication.SharedApplication.KeyWindow.RootViewController;
    while (currentController.PresentedViewController != null)
      currentController = currentController.PresentedViewController;
    UIView currentView = currentController.View;

    QLPreviewController qlPreview = new QLPreviewController();
    QLPreviewItem item = new QLPreviewItemBundle(filename, filePath);
    qlPreview.DataSource = new PreviewControllerDS(item);

    currentController.PresentViewController(qlPreview, true, null);
  }
}

C# [Cross-platform]

using Foundation;
using QuickLook;
using System;
using System.IO;

public class PreviewControllerDS : QLPreviewControllerDataSource
{
  //Document cache
  private QLPreviewItem _item;

  //Setting the document
  public PreviewControllerDS(QLPreviewItem item)
  {
    _item = item;
  }

  //Setting document count to 1
  public override nint PreviewItemCount (QLPreviewController controller)
  {
    return 1;
  }

  //Return the document
  public override IQLPreviewItem GetPreviewItem (QLPreviewController controller, nint index)
  {
    return _item;
  }
}

public class QLPreviewItemFileSystem : QLPreviewItem
{
  string _fileName, _filePath;

  //Setting file name and path
  public QLPreviewItemFileSystem(string fileName, string filePath)
  {
    _fileName = fileName;
    _filePath = filePath;
  }

  //Return file name
  public override string ItemTitle
  {
    get
    {
      return _fileName;
    }
  }

  //Retun file path as NSUrl
  public override NSUrl ItemUrl
  {
    get
    {
      return NSUrl.FromFilename(_filePath);
    }
  }
}

public class QLPreviewItemBundle : QLPreviewItem
{
  string _fileName, _filePath;

  //Setting file name and path
  public QLPreviewItemBundle(string fileName, string filePath)
  {
    _fileName = fileName;
    _filePath = filePath;
  }

  //Return file name
  public override string ItemTitle
  {
    get
    {
      return _fileName;
    }
  }

  //Retun file path as NSUrl
  public override NSUrl ItemUrl
  {
    get
    {
      var documents = NSBundle.MainBundle.BundlePath;
      var lib = Path.Combine(documents, _filePath);
      var url = NSUrl.FromFilename(lib);
      return url;
    }
  }
}

Save and View the Excel document in Windows Phone

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Storage;
using System.IO;
using Xamarin.Forms;

[assembly: Dependency(typeof(SaveWindowsPhone))]

class SaveWindowsPhone: ISave
{
  //Method to save document as a file in Windows Phone and view the saved document.
  public async Task SaveAndView(string filename, string contentType, MemoryStream stream)
  {
    //Save the stream to a file. 
    StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
    StorageFile outFile = await local.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
    using (Stream outStream = await outFile.OpenStreamForWriteAsync())
    {
	  outStream.Write(stream.ToArray(), 0, (int)stream.Length);
    }

    //Launch the saved file for viewing in default viewer.
    await Windows.System.Launcher.LaunchFileAsync(outFile);
  }
}