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dxm809
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C# 基于索引的筛选
List<int> lst = new List<int>(); lst.Add(3); lst.Add(1); lst.Add(2); List<int> lists = lst.Where((index, s) => index > 1 && s > 0).ToList();原创 2020-11-04 13:32:57 · 264 阅读 · 0 评论 -
按多个字段降序排序数据表
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Compo...原创 2019-08-15 15:01:52 · 607 阅读 · 0 评论 -
获取与not exists等价的语句
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Conta...原创 2019-08-15 15:01:44 · 225 阅读 · 0 评论 -
使用linq技术获取文件详细信息
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;...原创 2019-08-14 11:17:30 · 178 阅读 · 1 评论 -
使用linq对集合对象进行连接操作
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace JoinByLinq{ class Program { public struct Users { //定义字段 ...原创 2019-08-14 11:17:21 · 241 阅读 · 0 评论 -
使用linq对对象进行元素操作
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace OperateElementByLinq{ class Program { public struct Product { //定义...原创 2019-08-14 11:17:13 · 259 阅读 · 0 评论 -
使用linq对对象进行集合操作
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace OperateCollectionByLinq{ class Program { public class Order { //定义...原创 2019-08-14 11:17:06 · 333 阅读 · 0 评论 -
使用linq对对象进行聚合操作
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace PolymerizeByLinq{ class Program { public class User { //定义字段 ...原创 2019-08-14 11:16:55 · 241 阅读 · 0 评论 -
使用linq对对象进行排序操作
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace SortByLinq{ class Program { public class Person { //定义字段 ...原创 2019-08-14 11:16:47 · 389 阅读 · 0 评论 -
使用linq对对象进行投影操作
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ProjectionByLinq{ class Program { static void Main(string[] args) { ...原创 2019-08-14 11:16:22 · 393 阅读 · 0 评论 -
使用linq对对象进行筛选
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace FilterByLinq{ class Program { static void Main(string[] args) { //...原创 2019-08-14 11:16:14 · 333 阅读 · 0 评论 -
操作泛型通用集合
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Col...原创 2019-08-14 11:15:57 · 148 阅读 · 0 评论 -
操作泛型哈希集
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Gener...原创 2019-08-12 16:28:27 · 193 阅读 · 0 评论 -
操作泛型堆栈
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Gener...原创 2019-08-12 16:28:16 · 184 阅读 · 0 评论 -
操作泛型双向列表
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Gener...原创 2019-08-12 16:27:36 · 125 阅读 · 0 评论 -
数据源转换成一对多字典
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace ToLoo...原创 2019-08-12 16:26:37 · 208 阅读 · 0 评论 -
按照多个条件进行分组
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Multi...原创 2019-08-15 15:02:07 · 1481 阅读 · 0 评论 -
关联查询多表数据
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Multi...原创 2019-08-15 15:01:58 · 291 阅读 · 0 评论 -
使用linq动态查询的方法
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Dynam...原创 2019-08-15 15:02:23 · 233 阅读 · 0 评论 -
使用linq对dataset进行筛选操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Dat...原创 2019-08-16 10:40:18 · 538 阅读 · 0 评论 -
使用linq查询dataset中的多个表
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Dat...原创 2019-08-16 10:40:06 · 185 阅读 · 0 评论 -
使用linq对dataset进行投影操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Dat...原创 2019-08-16 10:39:56 · 177 阅读 · 0 评论 -
检测数据库是否存在
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Datab...原创 2019-08-16 10:39:17 · 253 阅读 · 0 评论 -
并集操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Union...原创 2019-08-16 10:39:09 · 285 阅读 · 0 评论 -
交集操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Inter...原创 2019-08-16 10:38:57 · 210 阅读 · 0 评论 -
差集操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Excep...原创 2019-08-16 10:38:46 · 207 阅读 · 0 评论 -
Distinct操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Disti...原创 2019-08-16 10:38:38 · 279 阅读 · 0 评论 -
Aggregate操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Aggre...原创 2019-08-16 10:38:20 · 545 阅读 · 0 评论 -
Average操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Avera...原创 2019-08-15 15:03:02 · 321 阅读 · 0 评论 -
MIN操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Min{...原创 2019-08-15 15:02:55 · 206 阅读 · 0 评论 -
MAX操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Max{...原创 2019-08-15 15:02:48 · 171 阅读 · 0 评论 -
SUM操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Sum{...原创 2019-08-15 15:02:37 · 194 阅读 · 0 评论 -
Count操作
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Count...原创 2019-08-15 15:02:30 · 223 阅读 · 0 评论 -
数据源转换成泛型列表
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace ToLis...原创 2019-08-12 16:26:20 · 135 阅读 · 0 评论 -
数据源转换成字典
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace ToDic...原创 2019-08-12 16:26:30 · 361 阅读 · 0 评论 -
将数据源转换成IEnumerable
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace AsEnu...原创 2019-08-12 16:26:14 · 522 阅读 · 0 评论 -
返回元素集合中每个元素的属性
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Xml...原创 2019-08-20 14:00:23 · 418 阅读 · 0 评论 -
返回节点集合中每个节点的所有上级节点
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Xml...原创 2019-08-20 14:00:02 · 275 阅读 · 0 评论 -
使用linq返回指定节点的父节点
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Xml...原创 2019-08-20 13:59:53 · 234 阅读 · 0 评论 -
使用linq遍历指定节点下的所有对象
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Xml...原创 2019-08-20 13:59:34 · 345 阅读 · 0 评论