向DataTable添加一行，随笔

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace FindDataRow
{
class Program
{
static void Main(string[] args)
{
//创建数据库连接字符串
SqlConnection thisConnection = new SqlConnection(@"Data Source=WENGJIXI;" +
@"Initial Catalog=NorthWind;" +
@"Integrated Security=true;");

//创建DataAdapter对象，表示一组 SQL 命令和一个数据库连接，它们用于填充 DataSet 和更新数据源
SqlDataAdapter thisAdapter = new SqlDataAdapter("select CustomerID,CompanyName from Customers", thisConnection);
//创建一个SQL命名，关联DataAdapter对象。
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);

//创建DataSet对象
DataSet thisDataSet=new DataSet();
thisAdapter.Fill(thisDataSet, "Customers");
Console.WriteLine("#在向Customers表添加一行前，表里面行的个数：{0}", thisDataSet.Tables["Customers"].Rows.Count);

//下面的方法也可以用thisAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;替换
DataColumn[] keys = new DataColumn[1];//因为主键可以有多列，所以用DataColumn数组。
keys[0] = thisDataSet.Tables["Customers"].Columns["CustomerID"];
thisDataSet.Tables["Customers"].PrimaryKey = keys;
@writes:
Console.WriteLine("请输入你的公司ID");
string writeData = Console.ReadLine();
//使用DataRow对象的Find()方法查询XICO是否存在行中。
DataRow findRow = thisDataSet.Tables["Customers"].Rows.Find(writeData);
if (findRow == null)
{
Console.WriteLine("数据没有在Customers表中，可以向其中添加数据");
DataRow newRow = thisDataSet.Tables["Customers"].NewRow();
newRow["CustomerID"] = writeData;
Console.WriteLine("请输入你的公司名字");
string companyName = Console.ReadLine();
newRow["CompanyName"] = companyName;
thisDataSet.Tables["Customers"].Rows.Add(newRow);
if ((findRow = thisDataSet.Tables["Customers"].Rows.Find(writeData)) != null)
Console.WriteLine("成功向表添加一行数据");

}
else
{
Console.WriteLine("数据已经在Customers表中");
goto writes;
}

//更新数据库
thisAdapter.Update(thisDataSet, "Customers");
Console.WriteLine("#在向Customers表添加一行后，表里面行的个数：{0}", thisDataSet.Tables["Customers"].Rows.Count);

//关闭数据库连接
thisConnection.Close();
Console.ReadLine();
}
}
}