- Prerequisites
- Loading Excel document from Dropbox
- Saving Excel document to Dropbox
Contact Support
Loading and Saving Excel document in Dropbox Cloud Storage
29 Nov 202420 minutes to read
Prerequisites
- Create a Dropbox API app using the Dropbox Developer website.
- Use the App Console to set up your API app for secure access to Dropbox files and data.
Loading Excel document from Dropbox
Steps to load an Excel document from Dropbox Cloud Storage.
Step 1: Create a new ASP.NET Core Web Application (Model-View-Controller).
Step 2: Name the project.
Step 3: Install the following Nuget packages in your application from NuGet.org.
Step 4: Add a new button in the Index.cshtml as shown below.
@{Html.BeginForm("EditDocument", "Home", FormMethod.Get);
{
<div>
<input type="submit" value="Edit Document" style="width:150px;height:27px" />
</div>
}
Html.EndForm();
}
Step 5: Include the following namespaces in HomeController.cs.
using Dropbox.Api;
using Syncfusion.XlsIO;
using Syncfusion.Drawing;
Step 6: Include the below code snippet in HomeController.cs to load an Excel document from Dropbox Cloud Storage.
using (ExcelEngine excelEngine = new ExcelEngine())
{
IApplication application = excelEngine.Excel;
application.DefaultVersion = ExcelVersion.Xlsx;
//Download the document from DropBox
MemoryStream stream = await GetDocumentFromDropBox();
//Set the position as '0'
stream.Position = 0;
//Load the downloaded document
IWorkbook workbook = application.Workbooks.Open(stream);
IWorksheet worksheet = workbook.Worksheets[0];
worksheet.Range["A3"].Text = "Hello world";
//Saving the Excel to the MemoryStream
MemoryStream outputStream = new MemoryStream();
workbook.SaveAs(outputStream);
//Set the position as '0'
outputStream.Position = 0;
//Download the Excel file in the browser
FileStreamResult fileStreamResult = new FileStreamResult(outputStream, "application/excel");
fileStreamResult.FileDownloadName = "EditExcel.xlsx";
return fileStreamResult;
}
// Download file from DropBox
public async Task<MemoryStream> GetDocumentFromDropBox()
{
//Define the access token for authentication with the Dropbox API
var accessToken = "Access_Token";
//Define the file path in Dropbox where the file is located. For ex: "/Template.docx"
var filePathInDropbox = "FilePath";
try
{
//Create a new DropboxClient instance using the provided access token
using (var dbx = new DropboxClient(accessToken))
{
//Start a download request for the specified file in Dropbox
using (var response = await dbx.Files.DownloadAsync(filePathInDropbox))
{
//Get the content of the downloaded file as a stream
var content = await response.GetContentAsStreamAsync();
MemoryStream stream = new MemoryStream();
content.CopyTo(stream);
return stream;
}
}
}
catch (Exception ex)
{
Console.WriteLine($"Error retrieving document from DropBox: {ex.Message}");
throw; // or handle the exception as needed
}
}
A complete working example of how to load an Excel document from Dropbox Cloud Storage in ASP.NET Core is present on this GitHub page.
By executing the program, you will get the Excel document as follows.
Saving Excel document to Dropbox
Steps to save an Excel document to Dropbox Cloud Storage.
Step 1: Create a new ASP.NET Core Web Application (Model-View-Controller).
Step 2: Name the project.
Step 3: Install the following Nuget packages in your application from NuGet.org.
Step 4: Add a new button in the Index.cshtml as shown below.
@{Html.BeginForm("CreateDocument", "Home", FormMethod.Get);
{
<div>
<input type="submit" value="Upload Document" style="width:150px;height:27px" />
</div>
}
Html.EndForm();
}
Step 5: Include the following namespaces in HomeController.cs.
using Dropbox.Api;
using Syncfusion.XlsIO;
using Syncfusion.Drawing;
Step 6: Include the below code snippet in HomeController.cs to Save an Excel document to Dropbox Cloud Storage.
//Create an instance of ExcelEngine
using (ExcelEngine excelEngine = new ExcelEngine())
{
IApplication application = excelEngine.Excel;
application.DefaultVersion = ExcelVersion.Xlsx;
//Create a workbook
IWorkbook workbook = application.Workbooks.Create(1);
IWorksheet worksheet = workbook.Worksheets[0];
//Adding a picture
FileStream imageStream = new FileStream("AdventureCycles-Logo.png", FileMode.Open, FileAccess.Read);
IPictureShape shape = worksheet.Pictures.AddPicture(1, 1, imageStream, 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: +1 231-231-2310";
//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 = "+1 231-654-0000";
//Create a Hyperlink for e-mail in the cell A13
IHyperLink hyperlink = worksheet.HyperLinks.Add(worksheet.Range["A13"]);
hyperlink.Type = ExcelHyperLinkType.Url;
hyperlink.Address = "Steyn@greatlakes.com";
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
MemoryStream stream = new MemoryStream();
workbook.SaveAs(stream);
//Set the position as '0'
stream.Position = 0;
//Upload the document to Dropbox
await UploadDocumentToDropBox(stream);
return Ok("Excel document uploaded to DropBox Cloud Storage.");
}
// Upload file to Dropbox
public async Task<MemoryStream> UploadDocumentToDropBox(MemoryStream stream)
{
//Define the access token for authentication
var accessToken = "Access_Token";
//Define the file path in Dropbox where the file should be saved. For ex: "/Template.docx"
var filePathInDropbox = "FilePath";
try
{
//Create a new DropboxClient instance using the provided access token
using (var dbx = new DropboxClient(accessToken))
{
//Upload the file to Dropbox
var uploadResult =await dbx.Files.UploadAsync(filePathInDropbox, WriteMode.Overwrite.Instance, body: new MemoryStream(stream.ToArray()));
}
Console.WriteLine("Upload completed successfully");
}
catch (Exception ex)
{
Console.WriteLine($"Error uploading document to DropBox: {ex.Message}");
}
return stream;
}
A complete working example of how to save an Excel document to Dropbox Cloud Storage in ASP.NET Core is present on this GitHub page.
By executing the program, you will get the Excel document as follows.
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.