c#中如何往excel中写入数据

using System;
using System.IO;
using Excel;

namespace Kits.Excel
{
public class ExcelTools
{
///

/// 导出到EXCEL表
///

private static void toExcel(string FileName, string SheetName, System.Data.DataTable dt)
{
ApplicationClass myExcel = new ApplicationClass();
Worksheet worksheet = null;

string curPath = Directory.GetParent(FileName).FullName;
if(!Directory.Exists(curPath))
{
Directory.CreateDirectory(curPath);
}

if (File.Exists(FileName))
{
try
{
File.Delete(FileName);
}
catch
{
throw new Exception("文件操作出错，可能正在运行当前的EXCEL文件！");
}
}

try
{
object missing = System.Reflection.Missing.Value;

myExcel.Workbooks.Add(missing);
worksheet = (Worksheet)myExcel.ActiveSheet;
worksheet.Name = SheetName;
myExcel.Visible = false;

int iRows = dt.Rows.Count;
int iCol = dt.Columns.Count;

worksheet.get_Range( worksheet.Cells[1, 1], worksheet.Cells[ iRows+1, iCol] ).NumberFormatLocal = "@";

for( int i=0; i{
worksheet.Cells[1,i+1] = dt.Columns[i].ToString();
}

int size = iRows / 1000;
int page = 0;
string[,] rows = null;
for(int i=0; i{
if(page{
rows = new string[1000,iCol];
for(int count=0;count<1000;count++)
{
for(int j=0; j{
rows[count,j] = dt.DefaultView[i][j].ToString();
}
i++;
}
worksheet.get_Range(worksheet.Cells[page * 1000 + 2, 1], worksheet.Cells[ page * 1000 + 1001, iCol]).Value2 = rows;
page++;
}
else
{
int left = iRows % 1000;
rows = new string[left,iCol];
for(int count=0;count{
for(int j=0; j{
rows[count,j] = dt.DefaultView[i][j].ToString();
}
i++;
}
worksheet.get_Range(worksheet.Cells[iRows+2-left, 1], worksheet.Cells[ iRows+1, iCol]).Value2 = rows;
}
}

worksheet.SaveAs( FileName, missing, missing, missing, missing, missing, missing, missing, missing, missing);

}
catch(Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
myExcel.Workbooks.Close();
myExcel.Quit();

System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(myExcel);
worksheet = null;
myExcel = null;
GC.Collect();
}

}

///

/// 因为调用EXCEL后，结束时EXCEL进程并没有立即KILL，用这个方法调用可以KILL掉EXCEL
///

public static void callToExcel(string FileName, string SheetName, System.Data.DataTable dt)
{
toExcel(FileName, SheetName, dt);
GC.Collect();
}
}
}

需要添加一个引用Excel

using Spire.Xls;

namespace WriteToExcel
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建Workbook实例
            Workbook wb = new Workbook();

            //加载现有的excel文档
            wb.LoadFromFile(@"");

            //获取第一个工作表
            Worksheet sheet = wb.Worksheets[0];

            //在单元格A1写入数据
            sheet.Range["A1"].Text= "Hello World";

            //保存到原文档
            wb.Save();
        }
    }
}

以上代码需要引用spire.xls.dll到程序中