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asp.net导出数据到Excel的方法(完全无组件,不用调用Excel.exe)

2012-08-23 16:21 741 查看

using System;

using System.Text;

using System.Data;

using System.Data.OleDb;

namespace PowerAgent.DBUtility

{

    /**//// <summary>

    /// DataToExcel 的摘要说明。

    /// DataToExcel 的摘要说明。

    /// </summary>

    public class DataToExcel

    {

        const string ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;";

        public DataToExcel()

        {

        }

        public string DataTableToExcel(DataTable dt, string excelPath)

        {

            if (dt == null)

            {

                return "DataTable不能为空";

            }

            int rows = dt.Rows.Count;

            int cols = dt.Columns.Count;

            StringBuilder sb;

            string connString;

            if (rows == 0)

            {

                return "没有数据";

            }

            sb = new StringBuilder();

            connString = string.Format(ConnectionString, excelPath);

            //生成创建表的脚本

            sb.Append("CREATE TABLE ");

            sb.Append(dt.TableName + " ( ");

            for (int i = 0; i < cols; i++)

            {

                if (i < cols - 1)

                    sb.Append(string.Format("{0} varchar,", dt.Columns.ColumnName));

                else

                    sb.Append(string.Format("{0} varchar)", dt.Columns.ColumnName));

            }

            using (OleDbConnection objConn = new OleDbConnection(connString))

            {

                OleDbCommand objCmd = new OleDbCommand();

                objCmd.Connection = objConn;

                objCmd.CommandText = sb.ToString();

                try

                {

                    objConn.Open();

                    objCmd.ExecuteNonQuery();

                }

                catch (Exception e)

                {

                    return "在Excel中创建表失败，错误信息：" + e.Message;

                }

                生成插入数据脚本#region 生成插入数据脚本

                sb.Remove(0, sb.Length);

                sb.Append("INSERT INTO ");

                sb.Append(dt.TableName + " ( ");

                for (int i = 0; i < cols; i++)

                {

                    if (i < cols - 1)

                        sb.Append(dt.Columns.ColumnName + ",");

                    else

                        sb.Append(dt.Columns.ColumnName + ") values (");

                }

                for (int i = 0; i < cols; i++)

                {

                    if (i < cols - 1)

                        sb.Append("@" + dt.Columns.ColumnName + ",");

                    else

                        sb.Append("@" + dt.Columns.ColumnName + ")");

                }

                #endregion

                //建立插入动作的Command

                objCmd.CommandText = sb.ToString();

                OleDbParameterCollection param = objCmd.Parameters;

                for (int i = 0; i < cols; i++)

                {

                    param.Add(new OleDbParameter("@" + dt.Columns.ColumnName, OleDbType.VarChar));

                }

                //遍历DataTable将数据插入新建的Excel文件中

                foreach (DataRow row in dt.Rows)

                {

                    for (int i = 0; i < param.Count; i++)

                    {

                        param.Value = row;

                    }

                    objCmd.ExecuteNonQuery();

                }

                return "数据已成功导入Excel";

            }//end using

        }

    }//end class

}

-----C# 将数据导出到_execl汇总 http://blog.vsharing.com/jekkon/A1129596.html

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标签： excel asp.net string properties exception 脚本

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