C#自定义导出数据到Excel的类实例

using System;using System.IO;using System.Data;using System.Collections;using System.Data.OleDb;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace DotNet.Utilities{  /// <summary>  /// Excel操作类  /// </summary>  /// Microsoft Excel 11.0 Object Library  public class ExcelHelper  {    #region 数据导出至Excel文件    /// </summary>    /// 导出Excel文件，自动返回可下载的文件流    /// </summary>    public static void DataTable1Excel(System.Data.DataTable dtData)    {      GridView gvExport = null;      HttpContext curContext = HttpContext.Current;      StringWriter strWriter = null;      HtmlTextWriter htmlWriter = null;      if (dtData != null)      {        curContext.Response.ContentType = "application/vnd.ms-excel";        curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");        curContext.Response.Charset = "utf-8";        strWriter = new StringWriter();        htmlWriter = new HtmlTextWriter(strWriter);        gvExport = new GridView();        gvExport.DataSource = dtData.DefaultView;        gvExport.AllowPaging = false;        gvExport.DataBind();        gvExport.RenderControl(htmlWriter);        curContext.Response.Write("<meta http-equiv=/"Content-Type/" content=/"text/html;charset=gb2312/"/>" + strWriter.ToString());        curContext.Response.End();      }    }    /// <summary>    /// 导出Excel文件，转换为可读模式    /// </summary>    public static void DataTable2Excel(System.Data.DataTable dtData)    {      DataGrid dgExport = null;      HttpContext curContext = HttpContext.Current;      StringWriter strWriter = null;      HtmlTextWriter htmlWriter = null;      if (dtData != null)      {        curContext.Response.ContentType = "application/vnd.ms-excel";        curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;        curContext.Response.Charset = "";        strWriter = new StringWriter();        htmlWriter = new HtmlTextWriter(strWriter);        dgExport = new DataGrid();        dgExport.DataSource = dtData.DefaultView;        dgExport.AllowPaging = false;        dgExport.DataBind();        dgExport.RenderControl(htmlWriter);        curContext.Response.Write(strWriter.ToString());        curContext.Response.End();      }    }    /// <summary>    /// 导出Excel文件，并自定义文件名    /// </summary>    public static void DataTable3Excel(System.Data.DataTable dtData, String FileName)    {      GridView dgExport = null;      HttpContext curContext = HttpContext.Current;      StringWriter strWriter = null;      HtmlTextWriter htmlWriter = null;      if (dtData != null)      {        HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);        curContext.Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");        curContext.Response.ContentType = "application nd.ms-excel";        curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;        curContext.Response.Charset = "GB2312";        strWriter = new StringWriter();        htmlWriter = new HtmlTextWriter(strWriter);        dgExport = new GridView();        dgExport.DataSource = dtData.DefaultView;        dgExport.AllowPaging = false;        dgExport.DataBind();        dgExport.RenderControl(htmlWriter);        curContext.Response.Write(strWriter.ToString());        curContext.Response.End();      }    }    /// <summary>    /// 将数据导出至Excel文件    /// </summary>    /// <param name="Table">DataTable对象</param>    /// <param name="ExcelFilePath">Excel文件路径</param>    public static bool OutputToExcel(DataTable Table, string ExcelFilePath)    {      if (File.Exists(ExcelFilePath))      {        throw new Exception("该文件已经存在！");      }      if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))      {        Table.TableName = "Sheet1";      }      //数据表的列数      int ColCount = Table.Columns.Count;      //用于记数，实例化参数时的序号      int i = 0;      //创建参数      OleDbParameter[] para = new OleDbParameter[ColCount];      //创建表结构的SQL语句      string TableStructStr = @"Create Table " + Table.TableName + "(";      //连接字符串      string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";      OleDbConnection objConn = new OleDbConnection(connString);      //创建表结构      OleDbCommand objCmd = new OleDbCommand();      //数据类型集合      ArrayList DataTypeList = new ArrayList();      DataTypeList.Add("System.Decimal");      DataTypeList.Add("System.Double");      DataTypeList.Add("System.Int16");      DataTypeList.Add("System.Int32");      DataTypeList.Add("System.Int64");      DataTypeList.Add("System.Single");      //遍历数据表的所有列，用于创建表结构      foreach (DataColumn col in Table.Columns)      {        //如果列属于数字列，则设置该列的数据类型为double        if (DataTypeList.IndexOf(col.DataType.ToString()) >= 0)        {          para[i] = new OleDbParameter("@" + col.ColumnName, OleDbType.Double);          objCmd.Parameters.Add(para[i]);          //如果是最后一列          if (i + 1 == ColCount)          {            TableStructStr += col.ColumnName + " double)";          }          else          {            TableStructStr += col.ColumnName + " double,";          }        }        else        {          para[i] = new OleDbParameter("@" + col.ColumnName, OleDbType.VarChar);          objCmd.Parameters.Add(para[i]);          //如果是最后一列          if (i + 1 == ColCount)          {            TableStructStr += col.ColumnName + " varchar)";          }          else          {            TableStructStr += col.ColumnName + " varchar,";          }        }        i++;      }      //创建Excel文件及文件结构      try      {        objCmd.Connection = objConn;        objCmd.CommandText = TableStructStr;        if (objConn.State == ConnectionState.Closed)        {          objConn.Open();        }        objCmd.ExecuteNonQuery();      }      catch (Exception exp)      {        throw exp;      }      //插入记录的SQL语句      string InsertSql_1 = "Insert into " + Table.TableName + " (";      string InsertSql_2 = " Values (";      string InsertSql = "";      //遍历所有列，用于插入记录，在此创建插入记录的SQL语句      for (int colID = 0; colID < ColCount; colID++)      {        if (colID + 1 == ColCount) //最后一列        {          InsertSql_1 += Table.Columns[colID].ColumnName + ")";          InsertSql_2 += "@" + Table.Columns[colID].ColumnName + ")";        }        else        {          InsertSql_1 += Table.Columns[colID].ColumnName + ",";          InsertSql_2 += "@" + Table.Columns[colID].ColumnName + ",";        }      }      InsertSql = InsertSql_1 + InsertSql_2;      //遍历数据表的所有数据行      for (int rowID = 0; rowID < Table.Rows.Count; rowID++)      {        for (int colID = 0; colID < ColCount; colID++)        {          if (para[colID].DbType == DbType.Double && Table.Rows[rowID][colID].ToString().Trim() == "")          {            para[colID].Value = 0;          }          else          {            para[colID].Value = Table.Rows[rowID][colID].ToString().Trim();          }        }        try        {          objCmd.CommandText = InsertSql;          objCmd.ExecuteNonQuery();        }        catch (Exception exp)        {          string str = exp.Message;        }      }      try      {        if (objConn.State == ConnectionState.Open)        {          objConn.Close();        }      }      catch (Exception exp)      {        throw exp;      }      return true;    }    /// <summary>    /// 将数据导出至Excel文件    /// </summary>    /// <param name="Table">DataTable对象</param>    /// <param name="Columns">要导出的数据列集合</param>    /// <param name="ExcelFilePath">Excel文件路径</param>    public static bool OutputToExcel(DataTable Table, ArrayList Columns, string ExcelFilePath)    {      if (File.Exists(ExcelFilePath))      {        throw new Exception("该文件已经存在！");      }      //如果数据列数大于表的列数，取数据表的所有列      if (Columns.Count > Table.Columns.Count)      {        for (int s = Table.Columns.Count + 1; s <= Columns.Count; s++)        {          Columns.RemoveAt(s);  //移除数据表列数后的所有列        }      }      //遍历所有的数据列，如果有数据列的数据类型不是 DataColumn，则将它移除      DataColumn column = new DataColumn();      for (int j = 0; j < Columns.Count; j++)      {        try        {          column = (DataColumn)Columns[j];        }        catch (Exception)        {          Columns.RemoveAt(j);        }      }      if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))      {        Table.TableName = "Sheet1";      }      //数据表的列数      int ColCount = Columns.Count;      //创建参数      OleDbParameter[] para = new OleDbParameter[ColCount];      //创建表结构的SQL语句      string TableStructStr = @"Create Table " + Table.TableName + "(";      //连接字符串      string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";      OleDbConnection objConn = new OleDbConnection(connString);      //创建表结构      OleDbCommand objCmd = new OleDbCommand();      //数据类型集合      ArrayList DataTypeList = new ArrayList();      DataTypeList.Add("System.Decimal");      DataTypeList.Add("System.Double");      DataTypeList.Add("System.Int16");      DataTypeList.Add("System.Int32");      DataTypeList.Add("System.Int64");      DataTypeList.Add("System.Single");      DataColumn col = new DataColumn();      //遍历数据表的所有列，用于创建表结构      for (int k = 0; k < ColCount; k++)      {        col = (DataColumn)Columns[k];        //列的数据类型是数字型        if (DataTypeList.IndexOf(col.DataType.ToString().Trim()) >= 0)        {          para[k] = new OleDbParameter("@" + col.Caption.Trim(), OleDbType.Double);          objCmd.Parameters.Add(para[k]);          //如果是最后一列          if (k + 1 == ColCount)          {            TableStructStr += col.Caption.Trim() + " Double)";          }          else          {            TableStructStr += col.Caption.Trim() + " Double,";          }        }        else        {          para[k] = new OleDbParameter("@" + col.Caption.Trim(), OleDbType.VarChar);          objCmd.Parameters.Add(para[k]);          //如果是最后一列          if (k + 1 == ColCount)          {            TableStructStr += col.Caption.Trim() + " VarChar)";          }          else          {            TableStructStr += col.Caption.Trim() + " VarChar,";          }        }      }      //创建Excel文件及文件结构      try      {        objCmd.Connection = objConn;        objCmd.CommandText = TableStructStr;        if (objConn.State == ConnectionState.Closed)        {          objConn.Open();        }        objCmd.ExecuteNonQuery();      }      catch (Exception exp)      {        throw exp;      }      //插入记录的SQL语句      string InsertSql_1 = "Insert into " + Table.TableName + " (";      string InsertSql_2 = " Values (";      string InsertSql = "";      //遍历所有列，用于插入记录，在此创建插入记录的SQL语句      for (int colID = 0; colID < ColCount; colID++)      {        if (colID + 1 == ColCount) //最后一列        {          InsertSql_1 += Columns[colID].ToString().Trim() + ")";          InsertSql_2 += "@" + Columns[colID].ToString().Trim() + ")";        }        else        {          InsertSql_1 += Columns[colID].ToString().Trim() + ",";          InsertSql_2 += "@" + Columns[colID].ToString().Trim() + ",";        }      }      InsertSql = InsertSql_1 + InsertSql_2;      //遍历数据表的所有数据行      DataColumn DataCol = new DataColumn();      for (int rowID = 0; rowID < Table.Rows.Count; rowID++)      {        for (int colID = 0; colID < ColCount; colID++)        {          //因为列不连续，所以在取得单元格时不能用行列编号，列需得用列的名称          DataCol = (DataColumn)Columns[colID];          if (para[colID].DbType == DbType.Double && Table.Rows[rowID][DataCol.Caption].ToString().Trim() == "")          {            para[colID].Value = 0;          }          else          {            para[colID].Value = Table.Rows[rowID][DataCol.Caption].ToString().Trim();          }        }        try        {          objCmd.CommandText = InsertSql;          objCmd.ExecuteNonQuery();        }        catch (Exception exp)        {          string str = exp.Message;        }      }      try      {        if (objConn.State == ConnectionState.Open)        {          objConn.Close();        }      }      catch (Exception exp)      {        throw exp;      }      return true;    }    #endregion    /// <summary>    /// 获取Excel文件数据表列表    /// </summary>    public static ArrayList GetExcelTables(string ExcelFileName)    {      DataTable dt = new DataTable();      ArrayList TablesList = new ArrayList();      if (File.Exists(ExcelFileName))      {        using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;Data Source=" + ExcelFileName))        {          try          {            conn.Open();            dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });          }          catch (Exception exp)          {            throw exp;          }          //获取数据表个数          int tablecount = dt.Rows.Count;          for (int i = 0; i < tablecount; i++)          {            string tablename = dt.Rows[i][2].ToString().Trim().TrimEnd('$');            if (TablesList.IndexOf(tablename) < 0)            {              TablesList.Add(tablename);            }          }        }      }      return TablesList;    }    /// <summary>    /// 将Excel文件导出至DataTable(第一行作为表头)    /// </summary>    /// <param name="ExcelFilePath">Excel文件路径</param>    /// <param name="TableName">数据表名，如果数据表名错误，默认为第一个数据表名</param>    public static DataTable InputFromExcel(string ExcelFilePath, string TableName)    {      if (!File.Exists(ExcelFilePath))      {        throw new Exception("Excel文件不存在！");      }      //如果数据表名不存在，则数据表名为Excel文件的第一个数据表      ArrayList TableList = new ArrayList();      TableList = GetExcelTables(ExcelFilePath);      if (TableName.IndexOf(TableName) < 0)      {        TableName = TableList[0].ToString().Trim();      }      DataTable table = new DataTable();      OleDbConnection dbcon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0");      OleDbCommand cmd = new OleDbCommand("select * from [" + TableName + "$]", dbcon);      OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);      try      {        if (dbcon.State == ConnectionState.Closed)        {          dbcon.Open();        }        adapter.Fill(table);      }      catch (Exception exp)      {        throw exp;      }      finally      {        if (dbcon.State == ConnectionState.Open)        {          dbcon.Close();        }      }      return table;    }    /// <summary>    /// 获取Excel文件指定数据表的数据列表    /// </summary>    /// <param name="ExcelFileName">Excel文件名</param>    /// <param name="TableName">数据表名</param>    public static ArrayList GetExcelTableColumns(string ExcelFileName, string TableName)    {      DataTable dt = new DataTable();      ArrayList ColsList = new ArrayList();      if (File.Exists(ExcelFileName))      {        using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;Data Source=" + ExcelFileName))        {          conn.Open();          dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, new object[] { null, null, TableName, null });          //获取列个数          int colcount = dt.Rows.Count;          for (int i = 0; i < colcount; i++)          {            string colname = dt.Rows[i]["Column_Name"].ToString().Trim();            ColsList.Add(colname);          }        }      }      return ColsList;    }  }}