How to preserve data types during ImportDataTable in C#, VB.NET?
This article explains how to preserve data types while importing DataTable to worksheet.
While importing a DataTable to a worksheet using XlsIO, the data types can be preserved by setting the data type of column with values in the DataTable as string and preserveTypes as true in ImportDataTable method.
Code snippet to preserve a data types while importing DataTable to worksheet
//Importing a DataTable to Worksheet worksheet.ImportDataTable(dt, true, 1, 1, -1, -1, true);
To know more about importing and exporting data, please refer the documentation.
The following C#/VB complete code snippet illustrates how to preserve data types while importing DataTable to worksheet.
C#
using System;
using System.Data;
using System.IO;
using Syncfusion.XlsIO;
namespace PreserveLongNumber
{
class Program
{
static void Main(string[] args)
{
using (ExcelEngine excelEngine = new ExcelEngine())
{
IApplication application = excelEngine.Excel;
application.DefaultVersion = ExcelVersion.Excel2013;
//Create new workbook
IWorkbook workbook = application.Workbooks.Create(1);
//Accessing first worksheet in the workbook
IWorksheet worksheet = workbook.Worksheets[0];
//Creating a DataTable to import
DataTable dt = new DataTable();
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("Number", typeof(long));
dt.Columns.Add("StringNumber", typeof(string));
dt.Columns.Add("StringDate", typeof(string));
dt.Columns.Add("Date", typeof(DateTime));
DataRow dr1 = dt.NewRow();
dr1["Name"] = "aaa";
dr1["Number"] = 6755510089231745873;
dr1["StringNumber"] = "6755510089231745873";
dr1["Date"] = DateTime.Now.ToString();
dr1["StringDate"] = DateTime.Now.ToString();
dt.Rows.Add(dr1);
DataRow dr2 = dt.NewRow();
dr2["Name"] = "bbb";
dr2["Number"] = 6755510089231745873;
dr2["StringNumber"] = "6755510089231745873";
dr2["Date"] = DateTime.Now.ToString();
dr2["StringDate"] = DateTime.Now.ToString();
dt.Rows.Add(dr2);
DataRow dr3 = dt.NewRow();
dr3["Name"] = "ccc";
dr3["Number"] = 6755510089231745873;
dr3["StringNumber"] = "6755510089231745873";
dr3["Date"] = DateTime.Now.ToString();
dr3["StringDate"] = DateTime.Now.ToString();
dt.Rows.Add(dr3);
//Importing a DataTable to Worksheet
worksheet.ImportDataTable(dt, true, 1, 1, -1, -1, true);
//Save the workbook as stream
Stream stream = File.Create("Output.xlsx");
workbook.SaveAs(stream);
}
}
}
}
VB
Imports Syncfusion.XlsIO
Imports System
Imports System.Data
Imports System.IO
Namespace PreserveLongNumber
Class Program
Private Shared Sub Main(ByVal args() As String)
Using excelEngine As ExcelEngine = New ExcelEngine
Dim application As IApplication = excelEngine.Excel
application.DefaultVersion = ExcelVersion.Excel2013
'Create new workbook
Dim workbook As IWorkbook = application.Workbooks.Create(1)
'Accessing first worksheet in the workbook
Dim worksheet As IWorksheet = workbook.Worksheets(0)
'Creating a DataTable to import
Dim dt As DataTable = New DataTable
dt.Columns.Add("Name", GetType(System.String))
dt.Columns.Add("Number", GetType(System.Int64))
dt.Columns.Add("StringNumber", GetType(System.String))
dt.Columns.Add("StringDate", GetType(System.String))
dt.Columns.Add("Date", GetType(DateTime))
Dim dr1 As DataRow = dt.NewRow
dr1("Name") = "aaa"
dr1("StringNumber") = "6755510089231745873"
dr1("Date") = DateTime.Now.ToString
dr1("StringDate") = DateTime.Now.ToString
dt.Rows.Add(dr1)
Dim dr2 As DataRow = dt.NewRow
dr2("Name") = "bbb"
dr2("StringNumber") = "6755510089231745873"
dr2("Date") = DateTime.Now.ToString
dr2("StringDate") = DateTime.Now.ToString
dt.Rows.Add(dr2)
Dim dr3 As DataRow = dt.NewRow
dr3("Name") = "ccc"
dr3("StringNumber") = "6755510089231745873"
dr3("Date") = DateTime.Now.ToString
dr3("StringDate") = DateTime.Now.ToString
dt.Rows.Add(dr3)
'Importing a DataTable to Worksheet
worksheet.ImportDataTable(dt, True, 1, 1, -1, -1, True)
'Save the workbook as stream
Dim stream As Stream = File.Create("Output.xlsx")
workbook.SaveAs(stream)
End Using
End Sub
End Class
End Namespace
I hope you enjoyed learning about how to preserve data types during ImportDataTable in C#, VB.NET.
You can refer to our .NET Excel library page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our .NET Excel library example to understand how to create and manipulate data.
For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedbackportal. We are always happy to assist you!
