Could not find installable ISAM

程序中去读EXCEL文档，以前一直参考《Asp.net读取Excel文件 2》http://www.cnblogs.com/insus/archive/2011/05/05/2037808.html这个连接语句或是方法。

但在这次开发中，再次引用时，即出现了异常：“Could not find installable ISAM”。

奇怪！

经过一番查阅资料和修改，Insus.NET把代码稍作修改一调整：

程序又可以跑起来了...

 public static string ExcelConnectionString(string filePhysicalPath)
        {
            string connectionString = string.Empty;
            string fileExtension = filePhysicalPath.Substring(filePhysicalPath.LastIndexOf(".") + );
            switch (fileExtension)
            {
                case "xls":
                    connectionString = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"", filePhysicalPath);
                    break;
                case "xlsx":
                    connectionString = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=YES\"", filePhysicalPath);
                    break;
            }
            return connectionString;
        }

Source Code