Category / Section
How to preserve data types during ImportDataTable in C#, VB.NET?
2 mins read
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