本文实例讲述了C#自定义导出数据到Excel的类。分享给大家供大家参考。具体如下：

C#自定义Excel操作类，可以用于将DataTable导出到Excel文件，从Excel文件读取数据。

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; } }}

希望本文所述对大家的C#程序设计有所帮助。