SpreadsheetGear for .NET le da una API para trabajar con xls y xlsx libros de trabajo de .NET. Es más fácil de usar y más rápido que OleDB o el modelo de objetos COM de Excel. Puede ver el live samples o probarlo con el free trial.
exención de responsabilidad: Tengo SpreadsheetGear LLC
EDIT:
StingyJack comentó " Más rápido que OleDb mejor atrás, que reclamar hasta?".
Esta es una solicitud razonable. Veo todo el tiempo afirmaciones que sé que son falsas, así que no puedo culpar a nadie por ser escéptico.
A continuación se muestra el código para crear un libro de trabajo de 50,000 filas por 10 columnas con SpreadsheetGear, guárdelo en el disco, y luego sume los números usando OleDb y SpreadsheetGear.SpreadsheetGear lee las 500K celdas en 0.31 segundos en comparación con 0.63 segundos con OleDB, algo más del doble de rápido. SpreadsheetGear realmente crea y lee el libro de trabajo en menos tiempo de lo que lleva leer el libro de trabajo con OleDB.
El código está debajo. Puede probarlo usted mismo con la versión de prueba gratuita de SpreadsheetGear.
using System;
using System.Data;
using System.Data.OleDb;
using SpreadsheetGear;
using SpreadsheetGear.Advanced.Cells;
using System.Diagnostics;
namespace SpreadsheetGearAndOleDBBenchmark
{
class Program
{
static void Main(string[] args)
{
// Warm up (get the code JITed).
BM(10, 10);
// Do it for real.
BM(50000, 10);
}
static void BM(int rows, int cols)
{
// Compare the performance of OleDB to SpreadsheetGear for reading
// workbooks. We sum numbers just to have something to do.
//
// Run on Windows Vista 32 bit, Visual Studio 2008, Release Build,
// Run Without Debugger:
// Create time: 0.25 seconds
// OleDb Time: 0.63 seconds
// SpreadsheetGear Time: 0.31 seconds
//
// SpreadsheetGear is more than twice as fast at reading. Furthermore,
// SpreadsheetGear can create the file and read it faster than OleDB
// can just read it.
string filename = @"C:\tmp\SpreadsheetGearOleDbBenchmark.xls";
Console.WriteLine("\nCreating {0} rows x {1} columns", rows, cols);
Stopwatch timer = Stopwatch.StartNew();
double createSum = CreateWorkbook(filename, rows, cols);
double createTime = timer.Elapsed.TotalSeconds;
Console.WriteLine("Create sum of {0} took {1} seconds.", createSum, createTime);
timer = Stopwatch.StartNew();
double oleDbSum = ReadWithOleDB(filename);
double oleDbTime = timer.Elapsed.TotalSeconds;
Console.WriteLine("OleDb sum of {0} took {1} seconds.", oleDbSum, oleDbTime);
timer = Stopwatch.StartNew();
double spreadsheetGearSum = ReadWithSpreadsheetGear(filename);
double spreadsheetGearTime = timer.Elapsed.TotalSeconds;
Console.WriteLine("SpreadsheetGear sum of {0} took {1} seconds.", spreadsheetGearSum, spreadsheetGearTime);
}
static double CreateWorkbook(string filename, int rows, int cols)
{
IWorkbook workbook = Factory.GetWorkbook();
IWorksheet worksheet = workbook.Worksheets[0];
IValues values = (IValues)worksheet;
double sum = 0.0;
Random rand = new Random();
// Put labels in the first row.
foreach (IRange cell in worksheet.Cells[0, 0, 0, cols - 1])
cell.Value = "Cell-" + cell.Address;
// Using IRange and foreach be less code,
// but we'll do it the fast way.
for (int row = 1; row <= rows; row++)
{
for (int col = 0; col < cols; col++)
{
double number = rand.NextDouble();
sum += number;
values.SetNumber(row, col, number);
}
}
workbook.SaveAs(filename, FileFormat.Excel8);
return sum;
}
static double ReadWithSpreadsheetGear(string filename)
{
IWorkbook workbook = Factory.GetWorkbook(filename);
IWorksheet worksheet = workbook.Worksheets[0];
IValues values = (IValues)worksheet;
IRange usedRahge = worksheet.UsedRange;
int rowCount = usedRahge.RowCount;
int colCount = usedRahge.ColumnCount;
double sum = 0.0;
// We could use foreach (IRange cell in usedRange) for cleaner
// code, but this is faster.
for (int row = 1; row <= rowCount; row++)
{
for (int col = 0; col < colCount; col++)
{
IValue value = values[row, col];
if (value != null && value.Type == SpreadsheetGear.Advanced.Cells.ValueType.Number)
sum += value.Number;
}
}
return sum;
}
static double ReadWithOleDB(string filename)
{
String connectionString =
"Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=" + filename + ";" +
"Extended Properties=Excel 8.0;";
OleDbConnection connection = new OleDbConnection(connectionString);
connection.Open();
OleDbCommand selectCommand =new OleDbCommand("SELECT * FROM [Sheet1$]", connection);
OleDbDataAdapter dataAdapter = new OleDbDataAdapter();
dataAdapter.SelectCommand = selectCommand;
DataSet dataSet = new DataSet();
dataAdapter.Fill(dataSet);
connection.Close();
double sum = 0.0;
// We'll make some assumptions for brevity of the code.
DataTable dataTable = dataSet.Tables[0];
int cols = dataTable.Columns.Count;
foreach (DataRow row in dataTable.Rows)
{
for (int i = 0; i < cols; i++)
{
object val = row[i];
if (val is double)
sum += (double)val;
}
}
return sum;
}
}
}
Si no hay nada en la primera columna, ¿cuál es el problema? – StingyJack