Question

基本上，我从我设法做的数据库中获取信息。现在我需要获取列名称以显示在控制台应用程序中。我也试图像他们在sql server 2012中显示的那样对齐它们。现在我已经尝试获取列名但它不想工作而且我被卡住了。任何帮助表示赞赏。下面是我的代码。

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Mail;
using System.Net;

namespace sql_connection
{
class Program
{
    static void Main(string[] args)
    {                             
        string conn = null;
        SqlConnection connection;
        conn= ("Data Source=database\\SQL2012;Initial Catalog=jobs;User ID=user;Password=passs");

        connection = new SqlConnection(conn);
        try{

            connection.Open();
            Console.WriteLine("Connection Open!");
            SqlCommand cmd = new SqlCommand("SELECT [jobs].[dbo].[table hours].whd_Date,[jobs].[dbo].[table hours].whd_FromTime,[jobs].[dbo].[table hours].whd_ToTime, [jobs].[dbo].[table hours].whd_User,[jobs].[dbo].[table login].login_Email FROM [jobs].[dbo].[table hours]INNER JOIN [jobs].[dbo].[table login] ON [jobs].[dbo].[table hours].whd_User = [jobs].[dbo].[table login].login_LoginId WHERE  DATEDIFF(DAY,[whd_Date],GETDATE())<=7 AND   (whd_ToTime = '' OR whd_ToTime IS NULL) AND(whd_User=login_LoginId)");
            cmd.Connection = connection;
            SqlDataReader reader = cmd.ExecuteReader();
            var columns = new List<string>();
            for (int i = 0; i < reader.FieldCount; i++)
            {
                columns.Add(reader.GetName(i));
            }

            var list = new List<string>();

            while(reader.Read())
            {

                for (int i = 0; i < reader.FieldCount; i++)
                {
                    columns.Add(reader.GetName(i));
                }
                  var s = string.Format("{4},{3},{2}, {1}, {0}",
                   reader["whd_ToTime"] == DBNull.Value? "NULL" : reader["whd_ToTime"].ToString(), 
                   reader["whd_FromTime"] == DBNull.Value? "NULL" : reader  ["whd_FromTime"].ToString(), 
                   reader["whd_Date"].ToString(), 
                   reader["whd_User"].ToString(),
                   reader["login_Email"].ToString());
                  Console.WriteLine(i);
                Console.WriteLine(s);
                list.Add(s);




            }

            var sb = new StringBuilder();
            foreach (var s in list)
            {
                sb.AppendLine(s);
            }



            connection.Close();

             MailAddress to = new MailAddress("email@gmail.com");


            MailAddress from = new MailAddress("email@gmail.com");

            MailMessage mail = new MailMessage(from, to);


            mail.Subject = ("missed punch clock");

            mail.Body = sb.ToString();

            SmtpClient smtp = new SmtpClient();
            smtp.Host = "smtp.gmail.com";
            smtp.Port = 587;

            smtp.Credentials = new NetworkCredential(
                "email@gmail.com", "passworrd");
            smtp.EnableSsl = true;
            Console.WriteLine("Sending email..");
            smtp.Send(mail);
        } 




        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }                       
    }
}
}

Answer 1

Systems.Collections.Generic.List'1[System.String]是您在.ToString()上使用List<string>方法获得的结果，因此我猜测Console.WriteLine(i);行实际上是Console.WriteLine(list);。
如果我没错，那么你应该用Console.WriteLine(string.Join(", ", list.ToArray());

替换它

要正确对齐输出，您可以使用制表符（"\t"）而不是字符串之间的空格：

var s = string.Format("{4}\t, {3}\t, {2}\t, {1}\t, {0}";

Console.WriteLine(string.Join("\t,", list.ToArray()).TrimEnd(","));
Console.WriteLine(s);

从数据库获取信息和字段名称，并在控制台应用程序中将它们对齐

1 个答案: