[摘]C#读取Excel

有两种方式，一种是通过 OleDb(或Odbc) 来读取 Excel 的工作表，另一种是引用 Excel 的 Com+ 组件, 代码如下:

// 01 OleDb 示例

// ------------------------------------------------------------------------------------------------------------

 string fConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
             "Data Source=" + strFileName + ";" +
            "Extended Properties=Excel 8.0;HDR=Yes;IMEX=1";
 string fCommandText = "Select * From [Sheet1$]";
 DataSet fDataSet = new DataSet();
 using (OleDbDataAdapter fOleDbDataAdapter = new OleDbDataAdapter(fCommandText, fConnectionString))
 {
     fOleDbDataAdapter.Fill(fDataSet);
 }
// 02 Com +组件示例
//运行环境: Microsoft Office Excel 2003 + Microsoft Visual Studio 2005
//为项目添加 COM 组件的引用
//方法如下:
//项目 -> 添加引用 -> com -> Microsoft Excel Object 11.0 Object Library -> 确定
//此时项目里会增加 3 个引用, 分别是: Excel、Microsoft.Office.Core、VBIDE

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Runtime.InteropServices;
using Microsoft.Office.Interop.Excel;
using ExcelApplication = Microsoft.Office.Interop.Excel.ApplicationClass;
using System.IO;
namespace ExcalDemo
{
    public class ExcelFiles
    {
        public void CreateExcelFiles()
        {
            ExcelApplication excel = new ExcelApplication();
            try
            {
                excel.Visible = false;// 不显示 Excel 文件,如果为 true 则显示 Excel 文件
                excel.Workbooks.Add(Missing.Value);// 添加工作簿
                Worksheet sheet = (Worksheet)excel.ActiveSheet;// 获取当前工作表
                Range range = null;// 创建一个空的单元格对象
               
                range = sheet.get_Range("A1", Missing.Value);// 获取单个单元格
                range.RowHeight = 20;           // 设置行高
                range.ColumnWidth = 20;         // 设置列宽
                range.Borders.LineStyle = 1;    // 设置单元格边框
                range.Font.Bold = true;         // 加粗字体
                range.Font.Size = 20;           // 设置字体大小
                range.Font.ColorIndex = 5;      // 设置字体颜色
                range.Interior.ColorIndex = 6;  // 设置单元格背景色
                range.HorizontalAlignment = XlHAlign.xlHAlignCenter;// 设置单元格水平居中
                range.VerticalAlignment = XlVAlign.xlVAlignCenter;// 设置单元格垂直居中
                range.Value2 = "设置行高和列宽";// 设置单元格的值
                range = sheet.get_Range("B2", "D4");// 获取多个单元格
                range.Merge(Missing.Value);         // 合并单元格
                range.Columns.AutoFit();            // 设置列宽为自动适应
                range.NumberFormatLocal = "#,##0.00";// 设置单元格格式为货币格式
        // 设置单元格左边框加粗
                range.Borders[XlBordersIndex.xlEdgeLeft].Weight = XlBorderWeight.xlThick;
        // 设置单元格右边框加粗
                range.Borders[XlBordersIndex.xlEdgeRight].Weight = XlBorderWeight.xlThick;
                range.Value2 = "合并单元格";
                // 页面设置
                sheet.PageSetup.PaperSize = XlPaperSize.xlPaperA4;          // 设置页面大小为A4
                sheet.PageSetup.Orientation = XlPageOrientation.xlPortrait; // 设置垂直版面
                sheet.PageSetup.HeaderMargin = 0.0;                         // 设置页眉边距
                sheet.PageSetup.FooterMargin = 0.0;                         // 设置页脚边距
                sheet.PageSetup.LeftMargin = excel.InchesToPoints(0.354330708661417); // 设置左边距
                sheet.PageSetup.RightMargin = excel.InchesToPoints(0.354330708661417);// 设置右边距
                sheet.PageSetup.TopMargin = excel.InchesToPoints(0.393700787401575);  // 设置上边距
                sheet.PageSetup.BottomMargin = excel.InchesToPoints(0.393700787401575);// 设置下边距
                sheet.PageSetup.CenterHorizontally = true;                  // 设置水平居中
                // 打印文件
                sheet.PrintOut(Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
               
                // 保存文件到程序运行目录下
                sheet.SaveAs(Path.Combine(System.Windows.Forms.Application.StartupPath,"demo.xls"), Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
                excel.ActiveWorkbook.Close(false, null, null); // 关闭 Excel 文件且不保存
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                excel.Quit(); // 退出 Excel
                excel = null; // 将 Excel 实例设置为空
            }
        }
    }
}