asp.net返回记录集作为关联数组

Question

I'm trying to dig into asp.net and C# and have some problems;

I've built a class to access db-data (don't ask why, it's an assignment).

public static class dbConn {

  public static ArrayList dbGet(string odbcStr, string sql) {
    OdbcConnection DbConnection = new OdbcConnection(odbcStr);
    ...
    ArrayList rowList = new ArrayList();
    ...
    while (DbReader.Read())
    {
        object[] values = new object[DbReader.FieldCount];
        DbReader.GetValues(values);
        rowList.Add(values);
    }
    ....
    return rowList;

I guess it's ok, my problem is how to show returned data; in about.aspx.cs:

void Page_Load(object sender, EventArgs e)
{
    ArrayList RS = new ArrayList();
    RS = dbConn.dbGet("DSN=mysqloverodbc", "select * from pages");
    Array RSrow = RS[0];
    sqlText.Text = RS[0]; 
    //what I want here is to request [0]["PageID"] or similar.

Blinded by the complexity of .net, I've failed to get help at google.

regards, //t

Answer 1

You almost there. Here is what you have to change.

Array RSrow = RS[0] as Array;
int pageIDIndex = 0; // Note :you have to know the column index in the table.i.e If the table has three columns, then the column index starts from 0 to columns length-1
sqlText.Text = RSrow.GetValue(pageIndexID).ToString();

Answer 2

Have you tried using [0]["PageID"] ?

Your assignment to sqlText.Text will not work since RS[0] is an array.

Try this if sqlText is a TextBox:

sqlText.Text = RS[0]["PageID"].ToString(); 

Answer 3

C# doesn't support associative arrays natively.

The problem with sqlText.Text = RS[0]["PageID"].ToString(); is that the RS[0] gets to the first record of the ArrayList, which is an array of type Object - object[] . But object[] doesn't have an indexer that takes a string -- you can't specify a string value for the object[] array's index.

If you are stuck with using an object array, you will have to use index values for the item values. For example,

sqlText.Text = RS[0][0].ToString();   // Row 0, Column 0

The first 0 refers to the row, as it is an index into the ArrayList .
The second 0 refers to the column, as it is an index into an object[] you created on the line after your while (DbReader.Read()) line.

The second index will be the columns in the order returned by the DbReader .