摘要：题目很简单 例如有2个集合 List listA = new List { "a", "b", "c", "d", "e" }; List listB = new List { "a", "b", "f" }; 需要找出在listA中存在，在listB中不存在的元素。 实现方式一： List b... 阅读全文

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摘要：数据库连接 SqlConnection数据适配器 SqlDataAdapter数据命令 SqlCommand数据读取器 SqlDataReader事务处理 SqlTransaction命令参数 SqlParameter//SqlDataAdapter public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { string sql = "select * from Ticket 阅读全文

摘要：using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Runtime.Serialization.Formatters.Binary; //引用命名空间namespace ClassLibrary1{ public class Serialize { #region 二进制序列化 public MemoryStream SerializeBinary(object obj) { BinaryFormatter Serialze. 阅读全文

摘要：if OpenDialog1.Execute then begin try VExcelApp := CreateOleObject('Excel.Application'); VExcelWorkBook := VExcelApp.Workbooks.Open(OpenDialog1.FileName); VExcelApp.Visible := False; ComboBox1.Items.Clear; for i := 1 to VExcelApp.WorkSheets.Count do begin VExcelWorkSheet1 := VExcelWorkBook.S 阅读全文