C＃从CSV数据创建图表

Question

I tried to read a CSV Data and display it in a Chart in Visual Studio. I get a SystemArgument.Exception and it tolds me that he couldn't find the Column with the name "Date".

My Code is the following:

private void button1_Click_1(object sender, EventArgs e)
{

string file = "test.csv";
string dir = "C:\\Main";

string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
            dir + ";Extended Properties=\"Text;HDR=No;FMT=Delimited\"";
OleDbConnection myConnection = new OleDbConnection(ConStr);

string mySelectQuery = "Select * from " + file;
OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection);

myCommand.Connection.Open();
OleDbDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

chart1.Series["Test"].Points.DataBindXY(myReader, "Date",myReader,"Value");
chart1.Series["Test"].ChartType = SeriesChartType.Line;

myReader.Close();
myConnection.Close();
}

What is wrong? I hope someone can help me... the .Csv data is: Two columns - First column first row is Date Second Column first row is Value The Rows in the first column look 01.04.2010 - the Rows in the second column look like 234.567

Answer 1

I'm pretty sure that Select * from test.csv will not work. Try this code

string file = @"C:\Main\test.csv";

string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
            file + ";Extended Properties=\"Text;HDR=No;FMT=Delimited\"";

string query = @"select * from sheetName$";

sheetName is the name of the csv sheet, you should replace it with the right value !

Be aware if the csv has column names HDR should be YES in connection string

I'm giving you working example with xslx file !

       string file = @"C:\Projects\EverydayProject\test.xlsx";

       string connString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
                    file + ";Extended Properties='Excel 12.0 Xml;HDR=YES;'";

        OleDbConnection conn = new OleDbConnection(connString);
        conn.Open();
        string query = @"select * from [Table$]";

        DataTable tb = new DataTable();
        using(OleDbDataAdapter ad = new OleDbDataAdapter(query, conn))
        {
            ad.Fill(tb);
        }

        conn.Close();

The sheetName is Table, look how I add $ after the sheetName this is critical. Now in the tb you have the excel data !