ASP.NET：“找不到可安装的 ISAM”尝试读取 dBASE IV 文件时出现异常

发布于 2024-09-16 03:27:46 字数 640 浏览 20 评论 0原文

我需要在 ASP.NET 应用程序中打开并读取 Dbase 文件。当我尝试打开连接时，出现异常“无法找到可安装的 ISAM”。我已经尝试了这个问题中的最佳答案中的解决方案，但他们确实不适合我。

数据文件的文件路径是C:\dev\DATA.DBF。这是我用来尝试打开连接的代码：

Dim connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=C:\dev\DATA.DBF;Extended Properties=dBASE IV;"
Dim connection As OleDbConnection = New OleDbConnection(connectionString)
connection.Open()

此时我收到异常“无法找到可安装的 ISAM”。你有什么想法我可以尝试让它发挥作用吗？请注意，我可以将此文件作为 dBASE IV 文件导入到 Access 数据库中。

我在 Windows 7 上运行 Visual Studio 2008。如果您需要更多信息，请告诉我。感谢您的帮助。

原文

I need to open and read a Dbase file in my ASP.NET application. When I try to open the connection, I am getting the exception "Could not find installable ISAM." I have tried the solutions in the top answer in this question, but they did not work for me.

The filepath of the data file is C:\dev\DATA.DBF. Here is the code I am using to try to open the connection:

Dim connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=C:\dev\DATA.DBF;Extended Properties=dBASE IV;"
Dim connection As OleDbConnection = New OleDbConnection(connectionString)
connection.Open()

At this point I get the exception "Could not find installable ISAM." Do you have any ideas what I can try to get this to work? Note that I am able to import this file into an Access database as a dBASE IV file.

I am running Visual Studio 2008 on Windows 7. Let me know if you need any more information. Thanks for your help.

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暖阳 2024-09-23 03:27:46

我已经找到了解决这个问题的方法。我使用了这篇文章中概述的技术。

我使用 ODBC 连接而不是 OLE 连接。代码如下：

Dim connectionString = "Driver={Microsoft dBase Driver (*.dbf)};SourceType=DBF;SourceDB=C:\dev;Exclusive=No; Collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO;"
Dim connection As OdbcConnection = New OdbcConnnection(connectionString)
Dim command As OdbcCommand = New OdbcCommand("SELECT * FROM C:\dev\DATA.DBF", connection)
connection.Open()
Dim reader As OdbcDataReader = command.ExecuteReader()
connection.Close()

请注意，DBF 文件的目录名位于连接字符串中，而 DBF 文件的完整路径位于 select 语句中。我只是遵循链接帖子中的约定，它对我有用。

I have found a solution to this problem. I used the technique outlined in this post.

I am using an ODBC connection instead of an OLE connection. Here is the code:

Dim connectionString = "Driver={Microsoft dBase Driver (*.dbf)};SourceType=DBF;SourceDB=C:\dev;Exclusive=No; Collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO;"
Dim connection As OdbcConnection = New OdbcConnnection(connectionString)
Dim command As OdbcCommand = New OdbcCommand("SELECT * FROM C:\dev\DATA.DBF", connection)
connection.Open()
Dim reader As OdbcDataReader = command.ExecuteReader()
connection.Close()

Note that the directory name of the DBF file is in the connection string, while the full path of the DBF file is in the select statement. I simply followed the convention in the linked post, and it worked for me.

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