在控制台应用程序中显示使用DataTable的SQL查询结果？ [重复]

Question

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Displaying values from a SQL database in C# console application（1个答案）

[4天前关闭。

我正在尝试从控制台应用程序运行SQL Server的SQL查询，但无法在控制台上操作或显示此数据。

我尝试过：

static void Main(string[] args)
{
    string conexao = @"Integrated Security=SSPI;Persist Security Info=False;" +
         "Initial Catalog=Linhas;Data Source=HP\SQLEXPRESS";
    SqlConnection cn = new SqlConnection(conexao);
    SqlDataAdapter Da_fun = new SqlDataAdapter(
       @"select top 1 Name as '[NAME_USER]',Adress as '[ADRESS_USER]' " +
              "from TB_User order by ID_User asc", cn);
    DataTable Tb_fun = new DataTable();
    Da_fun.Fill(Tb_fun);
    Console.WriteLine(Tb_fun);

    Console.ReadKey();
}

打印类似“ System.Data.DataTable”的内容，而不是格式化精美的多列布局。

Answer 1

Datatable是行和列的集合，因此，您需要遍历行，然后需要打印每个单元格值。参见以下示例：

static DataTable GetTable()
    {
        DataTable table = new DataTable(); // New data table.
        table.Columns.Add("Dosage", typeof(int));
        table.Columns.Add("Drug", typeof(string));
        table.Columns.Add("Patient", typeof(string));
        table.Columns.Add("Date", typeof(DateTime));
        table.Rows.Add(15, "Abilify", "Jacob", DateTime.Now);
        table.Rows.Add(40, "Accupril", "Emma", DateTime.Now);
        table.Rows.Add(40, "Accutane", "Michael", DateTime.Now);
        table.Rows.Add(20, "Aciphex", "Ethan", DateTime.Now);
        table.Rows.Add(45, "Actos", "Emily", DateTime.Now);
        return table; // Return reference.
    }
    private static void Main(string[] args)
    {
        DataTable table = GetTable();
        foreach (DataRow row in table.Rows)
        {
            Console.WriteLine("--- Row ---");
            foreach (var item in row.ItemArray)
            {
                Console.Write("Item: "); // Print label.
                Console.WriteLine(item);
            }
        }
        Console.Read(); // Pause.

    }

//Output
--- Row ---
Item: 15
Item: Abilify
Item: Jacob
Item: 4/28/2020 7:18:18 AM
--- Row ---
Item: 40
Item: Accupril
Item: Emma
Item: 4/28/2020 7:18:18 AM
--- Row ---
Item: 40
Item: Accutane
Item: Michael
Item: 4/28/2020 7:18:18 AM
--- Row ---
Item: 20
Item: Aciphex
Item: Ethan
Item: 4/28/2020 7:18:18 AM
--- Row ---
Item: 45
Item: Actos
Item: Emily
Item: 4/28/2020 7:18:18 AM