Question

我正在尝试根据在comobox中选择的值更新richtext框的内容。它正在从SQL中提取PartnerName和Response，如下所示;

目前只能获取其中一个合作伙伴名称及其响应。我错过了什么？

       string connectionString = 
       VendorFinder.Properties.Settings.Default.VendorFinderConnectionString;

        SqlDataReader dr;
        SqlConnection con = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand("SELECT PartnerName, Response FROM 
        dbo.ResponseMessage", con);
        con.Open();
        cmd.CommandType = CommandType.Text;
        dr = cmd.ExecuteReader();

        if (dr.Read())
        {
            comboBox3.Items.Add(dr.GetValue(0));
            richTextBox1.Text = dr["Response"].ToString();
            dr.Close();
        }
        else
        {
            MessageBox.Show("No Record Found. Please try again", "Vendor 
            Finder", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

由于

Answer 1

您只调用dr.Read（）一次，以便获取我在循环中放入的所有数据

当您调用它时，Read（）方法充当光标移动到数据中的下一个位置，所以你必须继续调用它，你得到所有的数据

string connectionString = 
       VendorFinder.Properties.Settings.Default.VendorFinderConnectionString;
    SqlDataReader dr;
    SqlConnection con = new SqlConnection(connectionString);
    SqlCommand cmd = new SqlCommand("SELECT PartnerName, Response FROM 
    dbo.ResponseMessage", con);
    con.Open();
    cmd.CommandType = CommandType.Text;
    dr = cmd.ExecuteReader();

    if(dr.HasRows)
    {
        while (dr.Read())
        {
            comboBox3.Items.Add(dr.GetValue(0));
            richTextBox1.Text = dr["Response"].ToString();
        }
        dr.Close();
    }
    else
    {
        MessageBox.Show("No Record Found. Please try again", "Vendor 
        Finder", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }

C＃如何根据sql中的组合框选择拉取选项填充richbox

1 个答案: