[置顶] 将数据导出到excel文件的操作类（用法大全）

[             /// <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;
       }
   }