Excel操作幫助類

阿新 • • 發佈：2019-01-27

    /// <summary>

    /// Excel操作類

    /// </summary>

    /// Microsoft Excel 11.0 Object Library

    /// 

    public class ExcelHelper
    {
        #region 資料匯出至Excel檔案
        /// </summary> 

        /// 匯出Excel檔案，自動返回可下載的檔案流 

        /// </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>

        /// 匯出Excel檔案，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>

        /// 匯出Excel檔案，並自定義檔名

        /// </summary>

        public static void DataTable3Excel(System.Data.DataTable dtData, String FileName, List<string[]> columnList)
        {
            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.Default;
                curContext.Response.Charset = "gb2312";
                strWriter = new StringWriter();
                htmlWriter = new HtmlTextWriter(strWriter);

                dgExport = new GridView();
                dgExport.AutoGenerateColumns = false;

                /*--------建立列-----------*/
                columnList.ForEach((arr) =>
                {
                    BoundField boundField = new BoundField();
                    boundField.HtmlEncode = true;
                    boundField.DataField = arr[0];
                    boundField.HeaderText = arr[1];

                    dgExport.Columns.Add(boundField);
                });

                dgExport.DataSource = dtData.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.DataBind();
                dgExport.RenderControl(htmlWriter);
                curContext.Response.Write(strWriter.ToString());
                curContext.Response.End();
            }
        }

        /// <summary>

        /// 將資料匯出至Excel檔案

        /// </summary>

        /// <param name="Table">DataTable物件</param>

        /// <param name="ExcelFilePath">Excel檔案路徑</param>

        public static bool OutputToExcel(DataTable Table, string ExcelFilePath)
        {
            if (File.Exists(ExcelFilePath))
            {
                throw new Exception("該檔案已經存在！");
            }

            if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))
            {
                Table.TableName = "Sheet1";
            }

            //資料表的列數

            int ColCount = Table.Columns.Count;

            //用於記數，例項化引數時的序號

            int i = 0;

            //建立引數

            OleDbParameter[] para = new OleDbParameter[ColCount];

            //建立表結構的SQL語句

            string TableStructStr = @"Create Table " + Table.TableName + "(";

            //連線字串

            string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";
            OleDbConnection objConn = new OleDbConnection(connString);

            //建立表結構

            OleDbCommand objCmd = new OleDbCommand();

            //資料型別集合

            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");

            //遍歷資料表的所有列，用於建立表結構

            foreach (DataColumn col in Table.Columns)
            {
                //如果列屬於數字列，則設定該列的資料型別為double

                if (DataTypeList.IndexOf(col.DataType.ToString()) >= 0)
                {
                    para[i] = new OleDbParameter("@" + col.ColumnName, OleDbType.Double);
                    objCmd.Parameters.Add(para[i]);

                    //如果是最後一列

                    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]);

                    //如果是最後一列

                    if (i + 1 == ColCount)
                    {
                        TableStructStr += col.ColumnName + " varchar)";
                    }
                    else
                    {
                        TableStructStr += col.ColumnName + " varchar,";
                    }
                }
                i++;
            }

            //建立Excel檔案及檔案結構

            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，用於插入記錄，在此建立插入記錄的SQL語句

            for (int colID = 0; colID < ColCount; colID++)
            {
                if (colID + 1 == ColCount)  //最後一列

                {
                    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;

            //遍歷資料表的所有資料行

            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>

        /// 將資料匯出至Excel檔案

        /// </summary>

        /// <param name="Table">DataTable物件</param>

        /// <param name="Columns">要匯出的資料列集合</param>

        /// <param name="ExcelFilePath">Excel檔案路徑</param>

        public static bool OutputToExcel(DataTable Table, ArrayList Columns, string ExcelFilePath)
        {
            if (File.Exists(ExcelFilePath))
            {
                throw new Exception("該檔案已經存在！");
            }

            //如果資料列數大於表的列數，取資料表的所有列

            if (Columns.Count > Table.Columns.Count)
            {
                for (int s = Table.Columns.Count + 1; s <= Columns.Count; s++)
                {
                    Columns.RemoveAt(s);   //移除資料表列數後的所有列

                }
            }

            //遍歷所有的資料列，如果有資料列的資料型別不是 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";
            }

            //資料表的列數

            int ColCount = Columns.Count;

            //建立引數

            OleDbParameter[] para = new OleDbParameter[ColCount];

            //建立表結構的SQL語句

            string TableStructStr = @"Create Table " + Table.TableName + "(";

            //連線字串

            string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";
            OleDbConnection objConn = new OleDbConnection(connString);

            //建立表結構

            OleDbCommand objCmd = new OleDbCommand();

            //資料型別集合

            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();

            //遍歷資料表的所有列，用於建立表結構

            for (int k = 0; k < ColCount; k++)
            {
                col = (DataColumn)Columns[k];

                //列的資料型別是數字型

                if (DataTypeList.IndexOf(col.DataType.ToString().Trim()) >= 0)
                {
                    para[k] = new OleDbParameter("@" + col.Caption.Trim(), OleDbType.Double);
                    objCmd.Parameters.Add(para[k]);

                    //如果是最後一列

                    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]);

                    //如果是最後一列

                    if (k + 1 == ColCount)
                    {
                        TableStructStr += col.Caption.Trim() + " VarChar)";
                    }
                    else
                    {
                        TableStructStr += col.Caption.Trim() + " VarChar,";
                    }
                }
            }

            //建立Excel檔案及檔案結構

            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，用於插入記錄，在此建立插入記錄的SQL語句

            for (int colID = 0; colID < ColCount; colID++)
            {
                if (colID + 1 == ColCount)  //最後一列

                {
                    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;

            //遍歷資料表的所有資料行

            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;
        }

        /// <summary> 

        /// dtData是要匯出為Excel的DataTable,FileName是要匯出的Excel檔名(不加.xls) 

        /// </summary> 

        /// <param name="dtData"></param> 

        /// <param name="FileName"></param> 

        public static void DataTable3Excel(System.Data.DataTable dtData, String FileName)
        {
            System.Web.UI.WebControls.GridView dgExport = null;
            //當前對話 

            System.Web.HttpContext curContext = System.Web.HttpContext.Current;
            //IO用於匯出並返回excel檔案 

            System.IO.StringWriter strWriter = null;
            System.Web.UI.HtmlTextWriter htmlWriter = null;

            if (dtData != null)
            {
                //設定編碼和附件格式 

                //System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);//作用是防止中文檔名亂碼 

                curContext.Response.AddHeader("content-disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");
                curContext.Response.ContentType = "application nd.ms-excel";
                curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
                curContext.Response.Charset = "GB2312";

                //匯出Excel檔案 

                strWriter = new System.IO.StringWriter();
                htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);

                //為了解決dgData中可能進行了分頁的情況,需要重新定義一個無分頁的GridView 

                dgExport = new System.Web.UI.WebControls.GridView();
                dgExport.DataSource = dtData.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.DataBind();

                //下載到客戶端 

                dgExport.RenderControl(htmlWriter);
                curContext.Response.Write(strWriter.ToString());
                curContext.Response.End();
            }
        }


        #endregion

        /// <summary>

        /// 獲取Excel檔案資料表列表

        /// </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.Ace.OLEDB.12.0;Extended Properties='Excel 12.0;HDR=YES; IMEX=1';Data Source=" + ExcelFileName))
                {
                    try
                    {
                        conn.Open();
                        dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
                    }
                    catch (Exception exp)
                    {
                        throw exp;
                    }

                    //獲取資料表個數

                    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檔案匯出至DataTable(第一行作為表頭)

        /// </summary>

        /// <param name="ExcelFilePath">Excel檔案路徑</param>

        /// <param name="TableName">資料表名，如果資料表名錯誤，預設為第一個資料表名</param>

        public static DataTable InputFromExcel(string ExcelFilePath, string TableName)
        {
            if (!File.Exists(ExcelFilePath))
            {
                throw new Exception("Excel檔案不存在！");
            }

            //如果資料表名不存在，則資料表名為Excel檔案的第一個資料表

            ArrayList TableList = new ArrayList();
            TableList = GetExcelTables(ExcelFilePath);


            if (TableName.IndexOf(TableList[0].ToString().Trim()) < 0)
            {

                TableName = TableList[0].ToString().Trim();
            }

                DataTable table = new DataTable();
                OleDbConnection dbcon = new OleDbConnection(@"Provider=Microsoft.Ace.OLEDB.12.0;Data Source=" + ExcelFilePath + ";Extended Properties='Excel 12.0;HDR=YES; IMEX=1'");
                //OleDbCommand cmd = new OleDbCommand("select * from [" + TableName + "$]", dbcon);

                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檔案指定資料表的資料列表

        /// </summary>

        /// <param name="ExcelFileName">Excel檔名</param>

        /// <param name="TableName">資料表名</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.Ace.OLEDB.12.0;Extended Properties='Excel 12.0;HDR=YES; IMEX=1';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;
        }
    }

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