Question

我需要动态创建控件并在其中显示一些数据库值。现在我做了：

SqlCommand cmdBE = new SqlCommand("SELECT COUNT (type) FROM composants_test WHERE type = 'BE' AND codeArticlePF LIKE'%" + motcle + "%' ", con);
Int32 countBE = (Int32) cmdBE.ExecuteScalar();
Console.WriteLine("nb BE : " +countBE);
SqlCommand cmdBEName = new SqlCommand("SELECT codeArticleComposant FROM composants_test WHERE type = 'BE' AND codeArticlePF LIKE'%" + motcle + "%'", con);
SqlDataReader readerBE = cmdBEName.ExecuteReader();

if (readerBE.Read())
{
    Console.WriteLine(readerBE["codeArticleComposant"].ToString());
    int pointXBE = 20;
    int pointYBE = 20;
    panelBE.Controls.Clear();
    panelBE.Focus();
    for (int i = 0; i < countBE; i++)
    {
        TextBox textBoxBE = new TextBox();
        Label labelBE = new Label();
        textBoxBE.Name = "textBoxBE" + i;
        textBoxBE.Text = readerBE["codeArticleComposant"].ToString();
        textBoxBE.Location = new Point(pointXBE + 35, pointYBE);
        textBoxBE.CharacterCasing = CharacterCasing.Upper;
        textBoxBE.Width = 150;
        labelBE.Text = "BE" + (i + 1).ToString() + " : ";
        labelBE.Location = new Point(pointXBE, pointYBE);
        panelBE.Controls.Add(textBoxBE);
        panelBE.Controls.Add(labelBE);
        panelBE.Show();
        pointYBE += 30;
    }
    readerBE.Close();
}

我的问题是如果创建了几个控件，那么＃34; readerBE [＆＃34; codeArticleComposant＆＃34;]。ToString（）＆＃34;不会改变。如何让它循环我需要的不同结果呢？

Answer 1

您实际上需要继续阅读，直到使用While循环读取所有记录，因此请将if更改为While，如：

int i =0; // use local variable for generating controls unique names
While(readerBE.Read())
{
    //............
    //........... your code here
    TextBox textBoxBE = new TextBox();
    Label labelBE = new Label();
    textBoxBE.Name = "textBoxBE" + i;
    textBoxBE.Text = readerBE["codeArticleComposant"].ToString();
    textBoxBE.Location = new Point(pointXBE + 35, pointYBE);
    textBoxBE.CharacterCasing = CharacterCasing.Upper;
    textBoxBE.Width = 150;
    labelBE.Text = "BE" + (i + 1).ToString() + " : ";
    labelBE.Location = new Point(pointXBE, pointYBE);
    panelBE.Controls.Add(textBoxBE);
    panelBE.Controls.Add(labelBE);
    panelBE.Show();

    i++; // increment after each read

}

使用SQL查询填充动态创建的文本框

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