如何在c#中使用OLEDB将混合数据类型数据表写入EXCEL

问题描述

我有一个包含混合数据类型列的数据表（从 sql 查询中获取），需要在不更改数据类型的情况下将其写入 excel，这是我编写的代码，我取了一个示例数据表以供参考：

    DataTable dtA = new DataTable();

    dtA.Columns.Add("col1",typeof(string));

    dtA.Columns.Add("col2",typeof(decimal));

    dtA.Columns.Add("col3",typeof(DateTime));

    dtA.Columns.Add("col4");

    dtA.Rows.Add("VALUE1",23.3,"12-06-2021","VALUE4");

    // Now I am trying to push this datatable into an excel with the same multiple datatypes format:

   OleDbConnection objConn;

   OleDbCommand objCmd;

   OleDbDataAdapter objDatAdap = new OleDbDataAdapter();

   string excelConnectString;

   string reportspath =@"C:\Users\Report.xlsx";

   excelConnectString = (@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=NO;IMEX=1""").Replace("{0}",reportspath);

   objConn = new OleDbConnection(excelConnectString);

                try

                {

                    objConn.Open();
                    using (objCmd = new OleDbCommand())
                    {
                        objCmd.Connection = objConn;

                        List<KeyValuePair<string,string>> columnNamesFordtitems = new List<KeyValuePair<string,string>>();
                        foreach (DataColumn dataColumn in dtA.Columns)
                        {
                            columnNamesFordtitems.Add(new KeyValuePair<string,string>(dataColumn.ColumnName,dataColumn.DataType.ToString()));
                        }

                        string table = "test";
                        
                        DataTable dtSheets = objConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,null);
                        bool existsTable = dtSheets.Select().ToList().Exists(sheet => sheet["TABLE_NAME"].ToString() == table);
                        if (existsTable)
                        {
                            objCmd.CommandText = $"DROP TABLE [{table}];";
                            objCmd.ExecuteNonQuery();
                        }


         //this is the original query in case of common datatype

// objCmd.CommandText = $"CREATE TABLE [{table}] ({String.Join(",",columnNamesFor11A.Select(c => $"[{c}] string").ToArray())});";


   //how to do it in case of multiple datatype

   objCmd.CommandText = $"CREATE TABLE [{table}] ({String.Join(",columnNamesFordtitems.Select(c => $"[{c.Key,(c.Value)}]").ToArray())});";

   objCmd.ExecuteNonQuery();

                        foreach (DataRow row in dtA.Rows)

                        {

                            List<String> rowValues = new List<string>();

                            foreach (DataColumn column in dt.Columns)

                            {

                                rowValues.Add((row[column] != null && row[column] != DBNull.Value) ? row[column].ToString() : String.Empty);

                            }

                            objCmd.CommandText = $"INSERT INTO [{table}]({String.Join(",columnNamesFordt.Select(c => $"[{c}]"))}) VALUES ({String.Join(",rowValues.Select(r => $"'{r}'").ToArray())});";


                            objCmd.ExecuteNonQuery();

                        }

任何建议或解决方案都会对我很有帮助。 提前致谢

解决方法

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