MySQL阅读器用法C＃

Question

Ive been having some problems with understanding the MySql reader from MySql.Data.MySqlClient

This is my Code:

while (reader.Read())
{
    documentButtons = new RadioButton[3];
    for (int i = 0; i < 3; i++)
    {
        documentButtons[i] = new RadioButton();
        documentButtons[i].Text = reader["name"].ToString() + " " + (i + 1);

        Console.WriteLine(reader["name"].ToString());

        documentButtons[i].Location = new System.Drawing.Point(10, 10 + i * 20);
        this.Controls.Add(documentButtons[i]);
    }
}
Console.ReadLine();

This makes 3 radiobuttons with the texts: "Dokument1 1", "Dokument1 2", "Document1 3" As you can probably see, i want the number right behind "Dokument" to be equal to the number behind that. (My 3 first entries in the database is "Dokument1", "Dokument2" and "Dokument3". In my console, "Dokument1", 2 and 3, all show up 3 times. How can i make it create the appropriate name on the appropriate radiobutton?

Answer 1

I'm not sure I fully understand your question, but if you simply want to have a single RadioButton for each row returned, the following code should work:

documentButtons = new RadioButton[3];
int i = 0;
while (i <= 3 && reader.Read()) { // make sure we don't get an IndexOutOfRangeException
  documentButtons[i] = new RadioButton();
  documentButtons[i].Text = reader["name"].ToString() + " " + (i + 1);

  Console.WriteLine(reader["name"].ToString());

  documentButtons[i].Location = new System.Drawing.Point(10, 10 + i * 20);
  this.Controls.Add(documentButtons[i]);

  ++i;
}