c# - .txt 文件格式的 Microsoft Jet OLEDB 4.0 连接字符串

Question

这是我的 .txt 文件的连接字符串和一些代码

public class FileTransfers
{ 

    public void fileFromDrive(string filename)
    {
        FileInfo file = new FileInfo(filename);
        string fileConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + 
               file.DirectoryName + 
               "; Extended Properties='text;HDR=YES;FMT=Delimited(,)';";

        using (OleDbConnection con = new OleDbConnection(fileConnectionString))
        {
            using (OleDbCommand cmd = new OleDbCommand(
                string.Format("SELECT * FROM [{0}]", file.Name), con))
            {
                con.Open();



                using (OleDbDataAdapter adp = new OleDbDataAdapter(cmd))
                {
                    DataTable tbl = new DataTable("Attendance");
                    adp.Fill(tbl);
                }
            }
        }
    }
}

但问题是当我调试 tbl 中的记录时，它只显示一列中的数据，但在我的 .txt 文件中有 7 个多列和数百行。

我试过 FMT=Delimited(,), FMT=TabDelimited,FMT=FiXed 但没有得到多列。我知道每个条目的末尾都需要一个 (,)，但我不能手动这样做。

Answer 1

正如 Jan Schreuder 在他的文章 Using OleDb to Import Text Files 中提到的那样，您需要考虑执行此过程的一些细节。 ,

The Jet engine makes assumptions about the content of the file. This can result in incorrect imports. For example, it might think a column contains date values. But in fact, your file should treat the columns as a string. In these cases, you should create a Schema.Ini file that describes the type of value for each column. The class creates a Schema.Ini file before it opens the delimited file, but only to specify what the delimiter is. You may want to change this to use pre-defined INI files that describe your input file.

因此，继续按照规定创建 schema.ini 文件，您的问题将全部消失。它的内容应该是这样的，

[FileName.csv]
ColNameHeader=True
Format=CSVDelimited

有关如何操作的更多详细信息，请参阅以下 MSDN 指南，

Schema.ini File (Text File Driver)