程序运行没有错误但没有给出所需的输出

时间:2014-10-22 04:13:44

标签: c# sql-server-2008-express

以下程序从SQL Server 2008表中提取数据后,应用简单的for循环并计算记录总数。程序编译并成功运行,没有任何错误,但不会打印到屏幕的记录总数。它不会打印任何东西。 .cs(代码隐藏)是:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Data;
namespace CountDocs
{
    public partial class Home : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void btnCount_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("Data Source=MEHDI-PC\\SQLEXPRESS; Initial Catalog=PIMS; Integrated Security=true;");
           {
                using (SqlCommand cmd = new SqlCommand())
                {
                    String sql = "select * from dbo.Company";
                    cmd.Connection = con;
                    cmd.CommandText = sql;
                    con1.Open();
                    Int32 Total = 0;
                            Total = (Int32)cmd1.ExecuteScalar();
                            Console.WriteLine(Total);
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                    }
                    for (int i = 0; i < dt.Rows.Count; ++i)
                    {
                        string companyname;
                        companyname = dt.Rows[i].ItemArray[0].ToString();
                        SqlConnection con1 = new SqlConnection("Data Source=MEHDI-PC\\SQLEXPRESS; Initial Catalog=PIMS; Integrated Security=true;");
                        {
                            using (SqlCommand cmd1 = new SqlCommand())
                            {
                                String sql1 = "select Count(*) from dbo.Documents where Src=" + "'" + companyname + "'";
                                cmd1.Connection = con1;
                                cmd1.CommandText = sql1;
                                con.Open();
                                DataTable dt1 = new DataTable();
                                Int32 Total = 0;
                                Total = (Int32)cmd1.ExecuteScalar();
                                Console.WriteLine(Total);
                                if (con.State == ConnectionState.Open)
                                {
                                    con.Close();
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

由于程序没有抛出任何语法错误,我想这可能是一个逻辑错误。有人可以告诉我吗?提前致谢。

1 个答案:

答案 0 :(得分:1)

系统工作正常,因为如果你写 dt1.Rows [0] .ToString(),你就没有得到单元格的值。这是因为System.Data.DataRowSystem.Data.DataRowSystem.Data.DataRowSystem.Data.DataRowSystem不会覆盖方法 ToString()

我认为您必须使用dt1.Rows[0].ItemArray[3]dt1.Rows[0]["column name"].ToString();

希望这有帮助。