static void Main(string[] args)
{
ProviderWater providerWater = delegate(Person person)
{
return(25);
};
Func <Person, int> func = person => 25;
#region 练习
User fg = new User("飞哥", "123456");
User fish = new User("小余", "234567");
User self = new User("自己", "345678");
User wait = new User("等待", "456789");
IEnumerable <User> users = new List <User> {
fg, fish, self, wait
};
Keyword csharp = new Keyword {
Word = "C#"
};
Keyword java = new Keyword {
Word = "java"
};
Keyword SQL = new Keyword {
Word = "sql "
};
Keyword UI = new Keyword {
Word = "UI"
};
Keyword NET = new Keyword {
Word = ".Net "
};
IEnumerable <Keyword> keywords = new List <Keyword> {
csharp, java, SQL, UI, NET
};
Comment excellent = new Comment {
Word = "666"
};
Comment good = new Comment {
Word = "66"
};
Comment common = new Comment {
Word = " 一般"
};
Comment bad = new Comment {
Word = "糟透了"
};
IEnumerable <Comment> comments = new List <Comment> {
excellent, good, common, bad
};
Article HTML = new Article
{
Comments = new List <Comment> {
excellent, good, common
},
Keywords = new List <Keyword> {
csharp, java, SQL, NET
},
Author = fg,
Title = "html",
PublishTime = new DateTime(2020, 1, 1)
};
Article JavaScript = new Article
{
Comments = new List <Comment> {
excellent, good, common, bad
},
Keywords = new List <Keyword> {
csharp, java, SQL
},
Author = fg,
Title = "javascript",
PublishTime = new DateTime(2020, 3, 20)
};
Article Python = new Article
{
Comments = new List <Comment> {
excellent, good, common
},
Keywords = new List <Keyword> {
SQL
},
Author = fg,
Title = "python",
PublishTime = new DateTime(2020, 2, 18)
};
Article Linux = new Article
{
Comments = new List <Comment> {
good, common
},
Keywords = new List <Keyword> {
csharp, SQL
},
Author = fish,
Title = "linux",
PublishTime = new DateTime(2020, 4, 1)
};
IEnumerable <Article> articles = new List <Article> {
HTML, Linux, JavaScript, Python
};
csharp.Articles = new List <Article> {
HTML, JavaScript
};
excellent.Article = HTML;
var articlebyfg = from a in articles
where a.Author.Name == "飞哥"
select a;
var articlebyfgl = articles.Where(a => a.Author.Name == "飞哥");
var articlebyfish = from a in articles
where a.Author.Name == "小鱼" && a.CreatTime > new DateTime(2019, 1, 1)
select a;
var articlebyfishl = articles.Where(a => a.Author.Name == " 小鱼").Where(t => t.CreatTime > new DateTime(2019, 1, 1));
var articledes = from a in articles
orderby a.PublishTime
select a;
var articledesl = articles.OrderByDescending(a => a.PublishTime);
var authorcount = from a in articles
group a by a.Author into aa
select new
{
authorname = aa.Key,
count = aa.Count(),
};
var authorcountl = articles.GroupBy(a => a.Author)
.Select(aa => new { author = aa.Key, count = aa.Count() }
);
var keywordcon = from a in articles
where a.Keywords.Contains(csharp) || a.Keywords.Contains(NET)
select a;
//var keywaordjion=from a in articles
// join k in keywords
// on a.Keywords
// where
var keywordconl = articles.Select(a => a.Keywords.Contains(csharp));
var commentmax = from a in articles
where a.Comments.Count > a.Comments.Count
select a;
var commentmaxl = articles.OrderBy(a => a.Comments.Count()).First();
var authorcomment = from a in articles
group a by a.Author into aa
select new
{
authorname = aa.Key.Name,
maxcomment = aa.OrderBy(aa => aa.Comments.Count()).First(),
};
var publishtimeari = from a in articles
orderby a.PublishTime
group a by a.Author into ap
select new
{
authorname = ap.Key.Name,
rencentariticle = ap.OrderBy(aa => aa.PublishTime).Last()
};
#endregion
#region creattime 反射
Content content = new Content();
ChangecreatTime(content, DateTime.Now);
#endregion
#region 特性+反射
Content article = new Article();
IsHelpMoneyChanged(article);
#endregion
}
public int GetWater(ProviderWater providerWater)
{
return(providerWater(new Person()));
}
