asp.net DataSet数据写入Excel保存自定义名称到默认文件夹内

using System;
using System.Web;
using Excel;
using System.Drawing;
using System.IO;
using System.Reflection;
using System.Data;
using System.Web.UI;
using System.Web.UI.WebControls;


/// <summary>
        /// DataSet数据写入Excel保存自定义名称到默认文件夹内（C:\web\SaveFile）
        /// </summary>
        /// <param name="ds">System.Data.DataSet数据</param>
        /// <param name="filename">文件名称（不含后缀）如"Wenjian"</param>
        public static void WriteExcel(System.Data.DataSet ds, string filename)
        {
            System.Data.DataTable dt = ds.Tables[0];
            //dt.Columns[0]   
            //Excel.Application excel = new Excel.Application();//引用Excel对象
            //excel.Application.Workbooks.Add(true );//引用Excel工作簿
            //excel.Cells[ 1 , 1 ] = "First Row First Column";
            //excel.Cells[ 1 , 2 ] = "First Row Second Column";
            //excel.Cells[ 2 , 1 ] = "Second Row First Column";
            //excel.Cells[2, 2] = "Second Row Second Column";
            //excel.Visible = true; //使Excel可视
            //创建Application对象 
            Excel.Application xApp = new Excel.ApplicationClass();

            xApp.Visible = false;
            ////得到WorkBook对象, 可以用两种方式之一: 下面的是打开已有的文件 
            //Excel.Workbook xBook = xApp.Workbooks._Open(@"C:\web\SaveFile\az.xls",
            //Missing.Value, Missing.Value, Missing.Value, Missing.Value
            //, Missing.Value, Missing.Value, Missing.Value, Missing.Value
            //, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
            Excel.Workbook xBook = xApp.Workbooks.Add(Missing.Value);//新建文件的代码 
            //指定要操作的Sheet，两种方式： 

            Excel.Worksheet xSheet = (Excel.Worksheet)xBook.Sheets[1];
            //Excel.Worksheet xSheet=(Excel.Worksheet)xApp.ActiveSheet; 

            ////读取数据，通过Range对象 
            //Excel.Range rng1 = xSheet.get_Range("A1", Type.Missing);
            //rng1.Value2 = "aaa";

            ////读取，通过Range对象，但使用不同的接口得到Range 
            ////Excel.Range rng2 = (Excel.Range)xSheet.Cells[1,2];
            ////rng2.Value2 = "bbb";
            //((Excel.Range)xSheet.Cells[1, 2]).Value="ccc";
            ////写入数据 
            //Excel.Range rng3 = xSheet.get_Range("B2", Missing.Value);
            //rng3.Value2 = "Hello";
            //rng3.Interior.ColorIndex = 6; //设置Range的背景色 
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                ((Excel.Range)xSheet.Cells[1, i + 1]).Value = dt.Columns[i].ColumnName;
                for (int j = 0; j < dt.Rows.Count; j++)
                {
                    ((Excel.Range)xSheet.Cells[j + 2, i + 1]).Value = dt.Rows[j][i];
                }
            }

            string pFilePath = @"C:\web\SaveFile\" + filename ?? System.DateTime.Now.ToString("yyyyMMdd") + ".xlsx";
            ////保存方式一：保存WorkBook 
            if (File.Exists(pFilePath))
            {
                File.Delete(pFilePath);
            }
            xBook.SaveAs(pFilePath,
            Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
            Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value,
            Missing.Value, Missing.Value);

            ////保存方式二：保存WorkSheet 
            //xSheet.SaveAs(@"../SaveFile/CData2.xls",
            //Missing.Value, Missing.Value, Missing.Value, Missing.Value,
            //Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

            //保存方式三 
            //xBook.Save();
            xSheet = null;
            xBook = null;
            xApp.Quit(); //这一句是非常重要的，否则Excel对象不能从内存中退出 
            xApp = null;
        }

封装到类库ExcelHelper

直接调用