我有一个连接字符串来读取我的C#项目中的excel文件,看起来像这样..
String ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source=" + VariableFile + ";" +
"Extended Properties=Excel 8.0;";
我也有objConn.Open();打开文件..
问题是我的程序打开文件的唯一时间是手动打开Excel文件并运行我的程序。任何人都可以帮助我从我的C#代码打开文件,而不必手动打开它。我收到错误消息:当我尝试运行它而不先打开Excel文件时找不到可安装的ISAM。
谢谢
答案 0 :(得分:8)
我认为您的连接字符串格式错误,“无法找到可安装的ISAM”通常表明这一点。
试试这个,它来自我的一个操作代码:
Excel 2007
string connectionString = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 12.0 Xml;HDR=No;IMEX=1\";", fullPath);
Excel 2003
string connectionString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0; data source={0}; Extended Properties=\"Excel 8.0;HDR=No;IMEX=1\";", fullPath);
答案 1 :(得分:2)
我最近不得不将此提供程序用于Azure Web作业,我需要使用OLEDB提供程序而不是Excel。
您可以使用以下设置安装Microsoft.ACE.OLEDB.12.0提供程序。
Microsoft Access数据库引擎2010可再发行组件 https://www.microsoft.com/en-us/download/details.aspx?id=13255
安装完成后,您可以修改.xls和.xlsx文件扩展名的连接字符串。
例如,以下代码将Excel文件转换为带有DataTable的DataSet,用于excel文件中的每个Worksheet。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Net;
...
public DataSet ExcelToDataSet(string excelFilename)
{
var dataSet = new DataSet(excelFilename);
// Setup Connection string based on which excel file format we are using
var excelType = "Excel 8.0";
if (excelFilename.Contains(".xlsx"))
{
excelType = "Excel 12.0 XML";
}
// <add key="Microsoft.ACE.OLEDB" value="Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='{1};HDR=YES;READONLY=TRUE'"/>
var connectionStringFormat = ConfigurationManager.AppSettings["Microsoft.ACE.OLEDB"].ToString();
var excelNamePath = string.Format(@"{0}\{1}", Environment.CurrentDirectory, excelFilename);
var connectionString = string.Format(connectionStringFormat, excelNamePath, excelType);
// Create a connection to the excel file
using (var oleDbConnection = new OleDbConnection(connectionString))
{
// Get the excel's sheet names
oleDbConnection.Open();
var schemaDataTable = (DataTable)oleDbConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
oleDbConnection.Close();
var sheetsName = GetSheetsName(schemaDataTable);
// For each sheet name
OleDbCommand selectCommand = null;
for (var i = 0; i < sheetsName.Count; i++)
{
// Setup select command
selectCommand = new OleDbCommand();
selectCommand.CommandText = "SELECT * FROM [" + sheetsName[i] + "]";
selectCommand.Connection = oleDbConnection;
// Get the data from the sheet
oleDbConnection.Open();
using (var oleDbDataReader = selectCommand.ExecuteReader(CommandBehavior.CloseConnection))
{
// Convert data to DataTable
var dataTable = new DataTable(sheetsName[i].Replace("$", "").Replace("'", ""));
dataTable.Load(oleDbDataReader);
// Add to Dataset
dataSet.Tables.Add(dataTable);
}
}
return dataSet;
}
}
private List<string> GetSheetsName(DataTable schemaDataTable)
{
var sheets = new List<string>();
foreach(var dataRow in schemaDataTable.AsEnumerable())
{
sheets.Add(dataRow.ItemArray[2].ToString());
}
return sheets;
}
答案 2 :(得分:1)
以下代码将阅读Excel文件&amp;用其数据填充DataTable
try
{
string connectionString = string.Empty;
if (Path.GetExtension(ExcelFileName) == ".xlsx")
{
connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ExcelFileName +
";Extended Properties=Excel 12.0;";
}
else
{
connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFileName + ";Extended Properties=Excel 8.0;";
}
OleDbCommand selectCommand = new OleDbCommand();
OleDbConnection connection = new OleDbConnection();
OleDbDataAdapter adapter = new OleDbDataAdapter();
connection.ConnectionString = connectionString;
if (connection.State != ConnectionState.Open)
connection.Open();
DataTable dtSchema = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
List<string> SheetsName = GetSheetsName(dtSchema);
for (int i = 0; i < SheetsName.Count; i++)
{
selectCommand.CommandText = "SELECT * FROM [" + SheetsName[i] + "]";
selectCommand.Connection = connection;
adapter.SelectCommand = selectCommand;
DataTable Sheet = new DataTable();
Sheet.TableName = SheetsName[i].Replace("$", "").Replace("'", "");
adapter.Fill(Sheet);
if (Sheet.Rows.Count > 0)
{
Records.Tables.Add(Sheet);
}
}
}
catch (Exception ex)
{
WriteLog(ex);
}
答案 3 :(得分:1)
其他选项是使用专用库而不是创建连接。看看EPPlus,它是一个开源库,可以在C#中使用excel文件。它对我来说非常好。
在此链接中,您可以看到使用EPPlus读取Excel文件的示例:
http://blog.fryhard.com/archive/2010/10/28/reading-xlsx-files-using-c-and-epplus.aspx
答案 4 :(得分:0)
连接到Excel有不同的提供程序。也许你应该尝试使用另一个。 看看这里的例子:
http://www.connectionstrings.com/excel
Excel的提供商 »Microsoft Jet OLE DB 4.0 »ACE OLEDB 12.0 »用于OLE DB的.NET Framework数据提供程序(OleDbConnection) »Microsoft Excel ODBC驱动程序 »用于ODBC的.NET Framework数据提供程序(OdbcConnection) ».NET xlReader for Microsoft Excel(ExcelConnection)
在你的情况下你应该有这样的东西: Provider = Microsoft.ACE.OLEDB.12.0; Data Source = c:\ myFolder \ myOldExcelFile.xls; Extended Properties =“Excel 12.0; HDR = YES”;