Asp.net中获取DataTable选择第一行某一列值

2020-01-17 22:27:44

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数据源是一个DataTable，现在我们需要获取这个DataTable的第一行第一列的值。

先准备一个数据集，创建一个DataTable，并填充数据：

source code:

using System;using System.Collections.Generic;using System.Data;using System.Linq;using System.Text;using System.Threading.Tasks;using Insus.NET.Models;namespace Insus.NET.Entities{ public class CustomerEntity {  public DataTable Customers()  {   DataTable dt = new DataTable();   dt.Columns.Add(new DataColumn("CustomerID", typeof(int)));   dt.Columns.Add(new DataColumn("CustomerName", typeof(string)));   dt.Columns.Add(new DataColumn("PID", typeof(string)));   DataRow dr = dt.NewRow();   dr["CustomerID"] = 9; dr["CustomerName"] = "张三"; dr["PID"] = "123456789012";   dt.Rows.Add(dr);   dr = dt.NewRow();   dr["CustomerID"] = 10; dr["CustomerName"] = "李四"; dr["PID"] = "321245677812";   dt.Rows.Add(dr);   dr = dt.NewRow();   dr["CustomerID"] = 30; dr["CustomerName"] = "吴广"; dr["PID"] = "213445678912";   dt.Rows.Add(dr);   dr = dt.NewRow();   dr["CustomerID"] = 35; dr["CustomerName"] = "王维"; dr["PID"] = "334456789012";   dt.Rows.Add(dr);   dr = dt.NewRow();   dr["CustomerID"] = 36; dr["CustomerName"] = "赵勇"; dr["PID"] = "213445678912";   dt.Rows.Add(dr);   return dt;  } }}

方法一，使用LINQ和Lambda: