“找不到可安装的ISAM” - “。xlsx”读取没有错误但是读取“xls”文件在Windows 7 32bit上获取该错误

Question

 OleDbConnection excelConnection=null;
            try
            {
                if (Path.GetExtension(excelFileName).Equals(".xls"))
                {
                    string conStr = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excelFileName + ";Extended Properties=" + "\"Excel 8.0 Xml;HDR=YES;IMEX=1;\"";
                    excelConnection = new OleDbConnection(conStr);
                }
                else
                {
                    string conStr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excelFileName + ";Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1;\";";
                    excelConnection = new OleDbConnection(conStr);

                }
                excelConnection.Open(); ***// this statement get the error!!!***
            }
            catch (Exception ex) { MessageBox.Show(ex.ToString()); }

This is my connection strings:

string 1.

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\~Projects IW\Desktop APPS\Maga\Book1.xls;Extended Properties="Excel 8.0 Xml;HDR=YES;IMEX=1;"

string 2.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\~Projects IW\Desktop APPS\Maga\Book1.xlsx;Extended Properties="Excel 12.0 Xml;HDR=YES;IMEX=1;";

When reading xls file using connection string 1 get error

"could not find installable isam"

But reading xlsx file using connection string 2 ;it is works fine: NO Errors!

Answer 1

Error is because of connection

for .xls try this connection string:

  StrConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + srcFile + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\";"; 

and for .xlsx try this connection string:

StrConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + srcFile + ";Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\";";

Answer 2

Your first connection string includes Excel 8.0 Xml; which will not work. Use Excel 8.0; instead.