Question

我收到了这个例外：

chart1.DataBindTable(myReader, "Name");

这里;完整的代码：

// Access database
            //System.Windows.Forms.DataVisualization.Charting.Utilities.SampleMain.MainForm mainForm = (System.Windows.Forms.DataVisualization.Charting.Utilities.SampleMain.MainForm)this.ParentForm;
            //string fileNameString = "\\data\\chartdata.mdb";

            // Initialize a connection string    
            string myConnectionString = "Provider=SQLOLEDB;Data Source=hermes;Initial Catalog=qcvaluestest;Integrated Security=SSPI;";

            // Define the database query    
            string mySelectQuery = "SELECT name, finalconc from qvalues where rowid in (20365,20366,20367);";

            // Create a database connection object using the connection string    
            OleDbConnection myConnection = new OleDbConnection(myConnectionString);

            // Create a database command on the connection using query    
            OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection);

            // Open the connection    
            myCommand.Connection.Open();

            // Create a database reader    
            OleDbDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

            // Since the reader implements and IEnumerable, pass the reader directly into
            // the DataBindTable method with the name of the Column to be used as the XValue
            chart1.DataBindTable(myReader, "Name");

            // Close the reader and the connection
            myReader.Close();
            myConnection.Close();

我在做错了什么？我知道应该连接。也许sql语句没有返回任何东西？

Answer 1

我不确定，但请尝试在myReader.Read()之前使用DataBindTable或尝试此操作：

OleDbDataAdapter da = new OleDbDataAdapter(myCommand);                
DataTable data = new DataTable();
da.Fill(data);    
chart1.DataBindTable(data.AsDataView(), "name");

c＃NotSupportedException未处理DATABINDTABLE

1 个答案: