本文實例講述了C#自定義導出數據到Excel的類。分享給大家供大家參考。具體如下：
C#自定義Excel操作類，可以用于將DataTable導出到Excel文件，從Excel文件讀取數據。
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操作類 /// </summary> /// Microsoft Excel 11.0 Object Library public class ExcelHelper { #region 數據導出至Excel文件 /// </summary> /// 導出Excel文件，自動返回可下載的文件流 /// </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> /// 導出Excel文件，轉換為可讀模式 /// </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> /// 導出Excel文件，并自定義文件名 /// </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> /// 將數據導出至Excel文件 /// </summary> /// <param name="Table">DataTable對象</param> /// <param name="ExcelFilePath">Excel文件路徑</param> public static bool OutputToExcel(DataTable Table, string ExcelFilePath) { if (File.Exists(ExcelFilePath)) { throw new Exception("該文件已經存在！"); } if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table")) { Table.TableName = "Sheet1"; } //數據表的列數 int ColCount = Table.Columns.Count; //用于記數，實例化參數時的序號 int i = 0; //創建參數 OleDbParameter[] para = new OleDbParameter[ColCount]; //創建表結構的SQL語句 string TableStructStr = @"Create Table " + Table.TableName + "("; //連接字符串 string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;"; OleDbConnection objConn = new OleDbConnection(connString); //創建表結構 OleDbCommand objCmd = new OleDbCommand(); //數據類型集合 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"); //遍歷數據表的所有列，用于創建表結構 foreach (DataColumn col in Table.Columns) { //如果列屬于數字列，則設置該列的數據類型為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++; } //創建Excel文件及文件結構 try { objCmd.Connection = objConn; objCmd.CommandText = TableStructStr; if (objConn.State == ConnectionState.Closed) { objConn.Open(); } objCmd.ExecuteNonQuery(); } catch (Exception exp) { throw exp; } //插入記錄的SQL語句 string InsertSql_1 = "Insert into " + Table.TableName + " ("; string InsertSql_2 = " Values ("; string InsertSql = ""; //遍歷所有列，用于插入記錄，在此創建插入記錄的SQL語句 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; //遍歷數據表的所有數據行 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> /// 將數據導出至Excel文件 /// </summary> /// <param name="Table">DataTable對象</param> /// <param name="Columns">要導出的數據列集合</param> /// <param name="ExcelFilePath">Excel文件路徑</param> public static bool OutputToExcel(DataTable Table, ArrayList Columns, string ExcelFilePath) { if (File.Exists(ExcelFilePath)) { throw new Exception("該文件已經存在！"); } //如果數據列數大于表的列數，取數據表的所有列 if (Columns.Count > Table.Columns.Count) { for (int s = Table.Columns.Count + 1; s <= Columns.Count; s++) { Columns.RemoveAt(s); //移除數據表列數后的所有列 } } //遍歷所有的數據列，如果有數據列的數據類型不是 DataColumn，則將它移除 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"; } //數據表的列數 int ColCount = Columns.Count; //創建參數 OleDbParameter[] para = new OleDbParameter[ColCount]; //創建表結構的SQL語句 string TableStructStr = @"Create Table " + Table.TableName + "("; //連接字符串 string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;"; OleDbConnection objConn = new OleDbConnection(connString); //創建表結構 OleDbCommand objCmd = new OleDbCommand(); //數據類型集合 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(); //遍歷數據表的所有列，用于創建表結構 for (int k = 0; k < ColCount; k++) { col = (DataColumn)Columns[k]; //列的數據類型是數字型 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,"; } } } //創建Excel文件及文件結構 try { objCmd.Connection = objConn; objCmd.CommandText = TableStructStr; if (objConn.State == ConnectionState.Closed) { objConn.Open(); } objCmd.ExecuteNonQuery(); } catch (Exception exp) { throw exp; } //插入記錄的SQL語句 string InsertSql_1 = "Insert into " + Table.TableName + " ("; string InsertSql_2 = " Values ("; string InsertSql = ""; //遍歷所有列，用于插入記錄，在此創建插入記錄的SQL語句 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; //遍歷數據表的所有數據行 DataColumn DataCol = new DataColumn(); for (int rowID = 0; rowID < Table.Rows.Count; rowID++) { for (int colID = 0; colID < ColCount; colID++) { //因為列不連續，所以在取得單元格時不能用行列編號，列需得用列的名稱 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> /// 獲取Excel文件數據表列表 /// </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; } //獲取數據表個數 int tablecount = dt.Rows.Count; for (int i = 0; i < tablecount; i++) { string tablename = dt.Rows[i][2].ToString().Trim().TrimEnd('$'); if (TablesList.IndexOf(tablename) < 0) { TablesList.Add(tablename); } } } } return TablesList; } /// <summary> /// 將Excel文件導出至DataTable(第一行作為表頭) /// </summary> /// <param name="ExcelFilePath">Excel文件路徑</param> /// <param name="TableName">數據表名，如果數據表名錯誤，默認為第一個數據表名</param> public static DataTable InputFromExcel(string ExcelFilePath, string TableName) { if (!File.Exists(ExcelFilePath)) { throw new Exception("Excel文件不存在！"); } //如果數據表名不存在，則數據表名為Excel文件的第一個數據表 ArrayList TableList = new ArrayList(); TableList = GetExcelTables(ExcelFilePath); if (TableName.IndexOf(TableName) < 0) { TableName = TableList[0].ToString().Trim(); } DataTable table = new DataTable(); OleDbConnection dbcon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0"); OleDbCommand cmd = new OleDbCommand("select * from [" + TableName + "$]", 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> /// 獲取Excel文件指定數據表的數據列表 /// </summary> /// <param name="ExcelFileName">Excel文件名</param> /// <param name="TableName">數據表名</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 }); //獲取列個數 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; } }}希望本文所述對大家的C#程序設計有所幫助。
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