教你C#将CSV转为Excel的实现方法

CSV(Comma Separated Values)文件是一种纯文本文件，包含用逗号分隔的数据，常用于将数据从一个应用程序导入或导出到另一个应用程序。通过将CSV文件转为EXCEL，可执行更多关于数据编辑、格式设置等操作。下面，将通过C#及VB.NET代码展示如何来实现转换。

一、程序环境

可通过以下途径来安装Excel库：

1. 通过NuGet安装Spire.XLS；

2. 官方下载包，解压安装到本地指定路径。在Visual Studio中打开“解决方案资源管理器”，将本地安装路径下Bin文件夹下的dll添加引用至程序。

二、将CSV转为Excel

C#

using Spire.Xls;

namespace CSVtoExcel_XLS
{
    class Program
    {
        static void Main(string[] args)
        {
            //加载CSV文件
            Workbook workbook = new Workbook();
            workbook.LoadFromFile("test.csv", ",", 1, 1);
            //获取第一个工作表
            Worksheet sheet = workbook.Worksheets[0];
            //访问工作表中使用的范围
            CellRange usedRange = sheet.AllocatedRange;
            //当将范围内的数字保存为文本时，忽略错误
            usedRange.IgnoreErrorOptions = IgnoreErrorType.NumberAsText;
            //自适应行高、列宽
            usedRange.AutoFitColumns();
            usedRange.AutoFitRows();
            //保存文档
            workbook.SaveToFile("result.xlsx", ExcelVersion.Version2013);
            System.Diagnostics.Process.Start("result.xlsx");
        }
    }
}

VB.NET

Imports Spire.Xls

Namespace CSVtoExcel_XLS
    Class Program
        Private Shared Sub Main(args As String())
            '加载CSV文件
            Dim workbook As New Workbook()
            workbook.LoadFromFile("test.csv", ",", 1, 1)
            '获取第一个工作表
            Dim sheet As Worksheet = workbook.Worksheets(0)
            '访问工作表中使用的范围
            Dim usedRange As CellRange = sheet.AllocatedRange
            '当将范围内的数字保存为文本时，忽略错误
            usedRange.IgnoreErrorOptions = IgnoreErrorType.NumberAsText
            '自适应行高、列宽
            usedRange.AutoFitColumns()
            usedRange.AutoFitRows()
            '保存文档
            workbook.SaveToFile("result.xlsx", ExcelVersion.Version2013)
            System.Diagnostics.Process.Start("result.xlsx")
        End Sub
    End Class
End Namespace

补充知识：C# .csv文件转为Excel格式；Excel格式转换为.csv，代码如下所示：

using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Windows.Forms;
using Excel=Microsoft.Office.Interop.Excel;

namespace WinFromAPP
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 将Csv文件转换为XLS文件
        /// </summary>
        /// <param name="FilePath">文件全路路径</param>
        /// <returns>返回转换后的Xls文件名</returns>
        public static string CSVSaveasXLS(string FilePath)
            QuertExcel();
            string _NewFilePath = "";
            Excel.Application excelApplication;
            Excel.Workbooks excelWorkBooks = null;
            Excel.Workbook excelWorkBook = null;
            Excel.Worksheet excelWorkSheet = null;
            try
            {
                excelApplication = new Excel.ApplicationClass();
                excelWorkBooks = excelApplication.Workbooks;
                excelWorkBook = ((Excel.Workbook)excelWorkBooks.Open(FilePath, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value));
                excelWorkSheet = (Excel.Worksheet)excelWorkBook.Worksheets[1];
                excelApplication.Visible = false;
                excelApplication.DisplayAlerts = false;
                _NewFilePath = FilePath.Replace(".csv", ".xls");
                excelWorkBook.SaveAs(_NewFilePath, Excel.XlFileFormat.xlAddIn, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
                excelWorkBook.Close();
                QuertExcel();
                // ExcelFormatHelper.DeleteFile(FilePath);
                //可以不用杀掉进程QuertExcel();
                GC.Collect(System.GC.GetGeneration(excelWorkSheet));
                GC.Collect(System.GC.GetGeneration(excelWorkBook));
                GC.Collect(System.GC.GetGeneration(excelApplication));
            }
            catch (Exception exc)
                throw new Exception(exc.Message);
            finally
                GC.Collect();
            return _NewFilePath;
        /// 将xls文件转换为csv文件
        /// <returns>返回转换后的csv文件名</returns>
        public static string XLSSavesaCSV(string FilePath)
                _NewFilePath = FilePath.Replace(".xls", ".csv");
                // excelWorkSheet._SaveAs(FilePath, Excel.XlFileFormat.xlCSVWindows, Missing.Value, Missing.Value, Missing.Value,Missing.Value,Missing.Value, Missing.Value, Missing.Value);
                excelWorkBook.SaveAs(_NewFilePath, Excel.XlFileFormat.xlCSV, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
                //ExcelFormatHelper.DeleteFile(FilePath);
        /// 删除一个指定的文件
        /// <param name="FilePath">文件路径</param>
        /// <returns></returns>
        public static bool DeleteFile(string FilePath)
                bool IsFind = File.Exists(FilePath);
                if (IsFind)
                {
                    File.Delete(FilePath);
                }
                else
                    throw new IOException("指定的文件不存在");
                return true;
        /// 执行过程中可能会打开多个EXCEL文件 所以杀掉
        private static void QuertExcel()
            Process[] excels = Process.GetProcessesByName("EXCEL");
            foreach (var item in excels)
                item.Kill();
        private void btnConvert_Click(object sender, EventArgs e)
            //CSVSaveasXLS(textBox1.Text);
            XLSSavesaCSV(textBox1.Text);
    }
}

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