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The sample demonstrates how to use Excel Filter function in Silverlight via Spire.XLS.
RTF, or Rich Text Format, is a file format designed for storing text and formatting information. While processing RTF files, sometimes you might need to convert them into a more web-friendly format such as HTML, or convert to images for better sharing and archiving purposes. In this article, you will learn how to convert RTF to HTML or images in C# using Spire.Doc for .NET.
Install Spire.Doc for .NET
To begin with, you need to add the DLL files included in the Spire.Doc for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.
PM> Install-Package Spire.Doc
Convert RTF to HTML in C#
Converting RTF to HTML ensures that the document can be easily viewed and edited in any modern web browser without requiring any additional software.
With Spire.Doc for .NET, you can achieve RTF to HTML conversion through the Document.SaveToFile(string fileName, FileFormat.Html) method. The following are the detailed steps.
- Create a Document instance.
- Load an RTF document using Document.LoadFromFile() method.
- Save the RTF document in HTML format using Document.SaveToFile(string fileName, FileFormat.Html) method.
- C#
using Spire.Doc;
namespace ConvertRtfToHtml
{
class Program
{
static void Main(string[] args)
{
//Create a Document instance
Document document = new Document();
//Load an RTF document
document.LoadFromFile("input.rtf");
//Save as HTML format
document.SaveToFile("RtfToHtml.html", FileFormat.Html);
}
}
}
Convert RTF to Image in C#
To convert RTF to images, we can use the Document.SaveToImages() method to convert an RTF file into individual Bitmap or Metafile images. Then, the Bitmap or Metafile images can be saved as a BMP, EMF, JPEG, PNG, GIF, or WMF format files. The following are the detailed steps.
- Create a Document object.
- Load an RTF document using Document.LoadFromFile() method.
- Convert the document to images using Document.SaveToImages() method.
- Iterate through the converted image, and then save each as a PNG file using Image[].Save(string fileName, ImageFormat format) method.
- C#
using Spire.Doc;
using System.Drawing.Imaging;
using System.Drawing;
using Spire.Doc.Documents;
namespace ConvertRtfToImage
{
class Program
{
static void Main(string[] args)
{
//Create a Document instance
Document document = new Document();
//Load an RTF document
document.LoadFromFile("input.rtf");
//Convert the RTF document to images
Image[] images = document.SaveToImages(ImageType.Bitmap);
// Iterate through the image collection
for (int i = 0; i < images.Length; i++)
{
//Save the image as png format
string outputfile = string.Format("image-{0}.png", i);
images[i].Save(outputfile, ImageFormat.Png);
}
}
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
Excel spreadsheet is a widely used file format that enables users to organize, analyze, and present data in a tabular format. The ability to interact with Excel files programmatically is highly valuable, as it allows automation and integration of Excel functionality into software applications. This capability is particularly useful when working with large datasets, performing complex calculations, or when data needs to be dynamically generated or updated. In this article, you will learn how to create, read, or update Excel documents in C# and VB.NET using Spire.XLS for .NET.
- Create an Excel File in C#, VB.NET
- Read Data of a Worksheet in C#, VB.NET
- Update an Excel File in C#, VB.NET
Install Spire.XLS for .NET
To begin with, you need to add the DLL files included in the Spire.XLS for .NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.
PM> Install-Package Spire.XLS
Create an Excel File in C#, VB.NET
Spire.XLS for .NET offers a variety of classes and interfaces that you can use to create and edit Excel documents. Here is a list of important classes, properties and methods involved in this article.
| Member | Description |
| Workbook class | Represents an Excel workbook model. |
| Workbook.Worksheets.Add() method | Adds a worksheet to workbook. |
| Workbook.SaveToFile() method | Saves the workbook to an Excel document. |
| Worksheet class | Represents a worksheet in a workbook. |
| Worksheet.Range property | Gets a specific cell or cell range from worksheet. |
| Worksheet.Range.Value property | Gets or sets the value of a cell. |
| Worksheet.Rows property | Gets a collection of rows in worksheet. |
| Worksheet.InsertDataTable() method | Imports data from DataTable to worksheet. |
| CellRange class | Represents a cell or cell range in worksheet. |
The following are the steps to create an Excel document from scratch using Spire.XLS for .NET.
- Create a Workbook object.
- Add a worksheet using Workbook.Worksheets.Add() method.
- Write data to a specific cell through Worksheet.Range.Value property.
- Import data from a DataTable to the worksheet using Worksheet.InsertDataTable() method.
- Save the workbook to an Excel document using Workbook.SaveToFile() method.
- C#
- VB.NET
using Spire.Xls;
using System.Data;
namespace CreateExcelSpreadsheet
{
class Program
{
static void Main(string[] args)
{
//Create a Workbook object
Workbook wb = new Workbook();
//Remove default worksheets
wb.Worksheets.Clear();
//Add a worksheet and name it "Employee"
Worksheet sheet = wb.Worksheets.Add("Employee");
//Merge the cells between A1 and G1
sheet.Range["A1:G1"].Merge();
//Write data to A1 and apply formatting to it
sheet.Range["A1"].Value = "Basic Information of Employees of Huanyu Automobile Company";
sheet.Range["A1"].HorizontalAlignment = HorizontalAlignType.Center;
sheet.Range["A1"].VerticalAlignment = VerticalAlignType.Center;
sheet.Range["A1"].Style.Font.IsBold = true;
sheet.Range["A1"].Style.Font.Size = 13F;
//Set row height of the first row
sheet.Rows[0].RowHeight = 30F;
//Create a DataTable
DataTable dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("Gender");
dt.Columns.Add("Birth Date");
dt.Columns.Add("Educational Background");
dt.Columns.Add("Contact Number");
dt.Columns.Add("Position");
dt.Columns.Add("ID");
dt.Rows.Add("Allen", "Male", "1990-02-10", "Bachelor", "24756854", "Mechanic", "0021");
dt.Rows.Add("Patrick", "Male", "1985-06-08", "Master", "59863247", "Mechanic", "0022");
dt.Rows.Add("Jenna", "Female", "1989-11-25", "Bachelor", "79540352", "Sales", "0023");
dt.Rows.Add("Tommy", "Male", "1988-04-16", "Master", "52014060", "Mechanic", "0024");
dt.Rows.Add("Christina", "Female", "1998-01-21", "Bachelor", "35401489", "HR", "0025");
//Import data from DataTable to worksheet
sheet.InsertDataTable(dt, true, 2, 1, true);
//Set row height of a range
sheet.Range["A2:G7"].RowHeight = 15F;
//Set column width
sheet.Range["A2:G7"].Columns[2].ColumnWidth = 15F;
sheet.Range["A2:G7"].Columns[3].ColumnWidth = 21F;
sheet.Range["A2:G7"].Columns[4].ColumnWidth = 15F;
//Set border style of a range
sheet.Range["A2:G7"].BorderAround(LineStyleType.Medium);
sheet.Range["A2:G7"].BorderInside(LineStyleType.Thin);
sheet.Range["A2:G2"].BorderAround(LineStyleType.Medium);
sheet.Range["A2:G7"].Borders.KnownColor = ExcelColors.Black;
//Save to a .xlsx file
wb.SaveToFile("NewSpreadsheet.xlsx", FileFormat.Version2016);
}
}
}
Read Data of a Worksheet in C#, VB.NET
The Worksheet.Range.Value property returns number value or text value of a cell as a string. To get data of a whole worksheet or a cell range, loop through the cells within it. The following are the steps to get data of a worksheet using Spire.XLS for .NET.
- Create a Workbook object.
- Load an Excel document using Workbook.LoadFromFile() method.
- Get a specific worksheet through Workbook.Worksheets[index] property.
- Get the cell range containing data though Worksheet.AllocatedRange property.
- Iterate through the rows and columns to get cells within the range, and return the value of each cell through CellRange.Value property.
- C#
- VB.NET
using Spire.Xls;
namespace ReadExcelData
{
class Program
{
static void Main(string[] args)
{
//Create a Workbook object
Workbook wb = new Workbook();
//Load an existing Excel file
wb.LoadFromFile(@"C:\Users\Administrator\Desktop\NewSpreadsheet.xlsx");
//Get the first worksheet
Worksheet sheet = wb.Worksheets[0];
//Get the cell range containing data
CellRange locatedRange = sheet.AllocatedRange;
//Iterate through the rows
for (int i = 0;i < locatedRange.Rows.Length;i++)
{
//Iterate through the columns
for (int j = 0; j < locatedRange.Rows[i].ColumnCount; j++)
{
//Get data of a specific cell
Console.Write(locatedRange[i + 1, j + 1].Value + " ");
}
Console.WriteLine();
}
}
}
}
Update an Excel Document in C#, VB.NET
To change the value of a certain cell, just re-assign a value to it through Worksheet.Range.Value property. The following are the detailed steps.
- Create a Workbook object.
- Load an Excel document using Workbook.LoadFromFile() method.
- Get a specific worksheet through Workbook.Worksheets[index] property.
- Change the value of a particular cell though Worksheet.Range.Value property.
- Save the workbook to an Excel file using Workbook.SaveToFile() method.
- C#
- VB.NET
using Spire.Xls;
namespace UpdateCellValue
{
class Program
{
static void Main(string[] args)
{
//Create a Workbook object
Workbook wb = new Workbook();
//Load an existing Excel file
wb.LoadFromFile(@"C:\Users\Administrator\Desktop\NewSpreadsheet.xlsx");
//Get the first worksheet
Worksheet sheet = wb.Worksheets[0];
//Change the value of a specific cell
sheet.Range["A1"].Value = "Updated Value";
//Save to file
wb.SaveToFile("Updated.xlsx", ExcelVersion.Version2016);
}
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
