如何在 C# 中导入 Excel 文件

// Supported Excel spreadsheet formats for reading include: XLSX, XLS, CSV, and TSV
WorkBook workbook = WorkBook.Load("test.xlsx");

// You can also load from a stream
using (var stream = File.OpenRead("test.xlsx"))
{
    WorkBook streamWorkbook = WorkBook.Load(stream);
}

// Or load CSV files with custom delimiters
WorkBook csvWorkbook = WorkBook.LoadCSV("data.csv", delimiter: ",");

' Supported Excel spreadsheet formats for reading include: XLSX, XLS, CSV, and TSV
Dim workbook As WorkBook = WorkBook.Load("test.xlsx")

' You can also load from a stream
Using stream = File.OpenRead("test.xlsx")
    Dim streamWorkbook As WorkBook = WorkBook.Load(stream)
End Using

' Or load CSV files with custom delimiters
Dim csvWorkbook As WorkBook = WorkBook.LoadCSV("data.csv", delimiter:=",")

// Get the first worksheet
WorkSheet sheet = workbook.WorkSheets.First();

// Or access by worksheet name
WorkSheet namedSheet = workbook.GetWorkSheet("Sheet1");

// Or by index (zero-based)
WorkSheet indexedSheet = workbook.WorkSheets[0];

' Get the first worksheet
Dim sheet As WorkSheet = workbook.WorkSheets.First()

' Or access by worksheet name
Dim namedSheet As WorkSheet = workbook.GetWorkSheet("Sheet1")

' Or by index (zero-based)
Dim indexedSheet As WorkSheet = workbook.WorkSheets(0)

WorkBook workbook = WorkBook.Load("test.xlsx");
WorkSheet sheet = workbook.WorkSheets.First();

// Traverse all rows of Excel WorkSheet
for (int i = 0; i < sheet.Rows.Count(); i++)
{
    // Traverse all columns of specific Row
    for (int j = 0; j < sheet.Columns.Count(); j++)
    {
        // Get the values
        string val = sheet.Rows[i].Columns[j].Value.ToString();
        Console.Write("{0}\t", val);
    }
    Console.WriteLine();
}

// Alternative method using LINQ for more efficient processing
var allData = sheet.Rows.SelectMany(row => 
    row.Columns.Select(col => col.Value?.ToString() ?? "")).ToList();

Dim workbook As WorkBook = WorkBook.Load("test.xlsx")
Dim sheet As WorkSheet = workbook.WorkSheets.First()

' Traverse all rows of Excel WorkSheet
For i As Integer = 0 To sheet.Rows.Count() - 1
    ' Traverse all columns of specific Row
    For j As Integer = 0 To sheet.Columns.Count() - 1
        ' Get the values
        Dim val As String = sheet.Rows(i).Columns(j).Value.ToString()
        Console.Write("{0}" & vbTab, val)
    Next
    Console.WriteLine()
Next

' Alternative method using LINQ for more efficient processing
Dim allData = sheet.Rows.SelectMany(Function(row) 
    row.Columns.Select(Function(col) If(col.Value?.ToString(), ""))).ToList()

// Convert worksheet to DataTable for easier manipulation
DataTable dataTable = sheet.ToDataTable(true); // true = first row contains headers

// Process data using DataTable methods
foreach (DataRow row in dataTable.Rows)
{
    foreach (var item in row.ItemArray)
    {
        Console.Write($"{item}\t");
    }
    Console.WriteLine();
}

' Convert worksheet to DataTable for easier manipulation
Dim dataTable As DataTable = sheet.ToDataTable(True) ' True = first row contains headers

' Process data using DataTable methods
For Each row As DataRow In dataTable.Rows
    For Each item In row.ItemArray
        Console.Write($"{item}" & vbTab)
    Next
    Console.WriteLine()
Next