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& 初七是&人日&有什么重要意义?七不出、八不归是什么意思?
初七是&人日&有什么重要意义?七不出、八不归是什么意思?
来源:整理 发布时间: 17:06:10
中国农历纪年法中每月的第七日称为初七,在某些特定环境里特指节日初七,依照农历的汉族传统节日有有正月初七(人日)、七月初七(七夕节)。
19日是农历羊年正月初一,从这一天开始,人们走亲访友,并举行各色活动以示庆贺,直至元宵节方告一段落。民俗专家王娟近日接受中新网记者采访时介绍,春节庆祝活动已有几千年历史,但至汉代庆祝日期才固定下来,也积累了很多的民俗活动。文化学者胡野秋则称,春节虽然是一个整体性的习俗,但每天的庆祝内容并不相同,从初一到初七,分别是鸡日、犬日、猪日、羊日、牛日、马日、人日,&&人日&的说法来源于女娲创世。传说女娲先用六天造出了鸡、狗、猪、羊、牛、马,积累了经验后,在第七天造出了人。&
绵延数千年:汉代方有固定庆祝日期 南北习俗有差异
作为绵延数千年的节日,春节的庆祝活动极多。王娟介绍,在历史上曾有不少有意思的活动,如除夕的籸盆、插芝麻秸等等,初一的放鸠、画鸡、五辛盘、吞鸡子等等。
据史籍记载,春节在唐虞时叫&载&,夏代叫&岁&,商代叫&祀&,周代才叫&年&。&年&的本义指谷物生长周期,谷子一年一热,所以春节一年一次,含有庆丰的寓意。又传,春节起源于原始社会末期的&腊祭&,每逢腊尽春来,先民便杀猪宰羊祭祀神鬼与祖先,祈求新的一年风调雨顺。至于互相拜年宴请,则大致起自汉初。
&春节的庆祝活动自有文字记录以来就有,但日期不定:古代中国由多个小国组成,文字、历法等均不统一。一直到汉代有了规范的历法,庆祝的日期才固定下来。&王娟解释道。
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初七是"人日"有什么重要意义?七不出、八不归是什么意思?
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环球热点图文&%@ Master Language="C#" %&
&!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&
&script runat="server"&
public DateTime LastUpdate
[color=#FF0000] return (DateTime)(ViewState["LastUpdate"] ?? DateTime.Now);[/color]
ViewState["LastUpdate"] =
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ScriptManager1.RegisterAsyncPostBackControl(Button2);
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上面代码中, 我标记为红色字体的是什么意思呀..
相当于SQL中的ISNULL(变量,默认值)string a = b?? "-1";b为null的时候,将"-1"赋值给a
只能在引用类型中使用,值类型永远不为null如int,double,decimal,DateTime,float等
The ?? operator returns the left-hand operand if it is not null, or else it returns the right operand.RemarksA nullable type can contain a value, or it can be undefined. The ?? operator defines the default value to be returned when a nullable type is assigned to a non-nullable type. If you try to assign a nullable type to a non-nullable type without using the ?? operator, you will generate a compile-time error. If you use a cast, and the nullable type is currently undefined, an InvalidOperationException exception will be thrown.
For more information, see Nullable Types (C# Programming Guide).Example
// nullable_type_operator.csusing Sclass MainClass{
static int? GetNullableInt()
static string GetStringValue()
static void Main()
// ?? operator example.
// y = x, unless x is null, in which case y = -1.
int y = x ?? -1;
// Assign i to return value of method, unless
// return value is null, in which case assign
// default value of int to i.
int i = GetNullableInt() ?? default(int);
string s = GetStringValue();
// ?? also works with reference types.
// Display contents of s, unless s is null,
// in which case display "Unspecified".
Console.WriteLine(s ?? "Unspecified");
?? 运算符 - 如果??运算符的左操作数非null,该运算符将返回左操作数,否则返回右操作数。
引用 3 楼 kkun_3yue3 的回复:
只能在引用类型中使用,值类型永远不为null 如int,double,decimal,DateTime,float等
泛型可空值类型也能用...
return a??-1;
写错了吧。应该是三元表达式ViewState["LastUpdate"]=?:DateTime.Now
原来这样相当于SQL中的ISNULL(变量,默认值)
string a = b?? "-1";
b为null的时候,将"-1"赋值给a我也没见过
引用 6 楼 zzxap 的回复:
写错了吧。应该是三元表达式
ViewState["LastUpdate"]=?:DateTime.Now
没写错,这是C#3.0的新特性:return (DateTime)(ViewState["LastUpdate"] ?? DateTime.Now);意思是:如果 ViewState["LastUpdate"] 不等于 null,则返回 (DateTime)(ViewState["LastUpdate"]),否则返回 DateTime.Now 。
a ?? b相当于:a != null ? a : b
三目运算的简写(针对null)string a=string b= a==null?"-1":a;-----&string b= a??"-1";
引用 6 楼 zzxap 的回复:
写错了吧。应该是三元表达式
ViewState["LastUpdate"]=?:DateTime.Now
另外,这里的 = 应该是 == 。C# 中 = 是赋值运算符, == 是比较运算符。且不说后面的 <span style="color:#FF-02-03 不能直接这么写,C# 中没有这种日期常量。
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引用 3 楼 kkun_3yue3 的回复:
只能在引用类型中使用,值类型永远不为null 如int,double,decimal,DateTime,float等
sorry 可空类型除外可空类型如这样定义的"值类型" int? i =
引用 14 楼 liujiayu10 的回复:
[code=C#][/code]
是条件运算符。&#8226;回答
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Powered byI know what I am proposing requires a completely different mind-set to what we have at present but what does the rest of the EPL have to lose?的翻译是:I know what I am proposing requires a completely different mind-set to what we have at present but what does the rest of the EPL have to lose?I was intrigued by her lucid a this was the first time I had seen a Chinese bhikshuni articulate her moral and intellectual position in such a forthright manner.的翻译是:我由她的清楚和强有力的论据吸引;这是,第一次我看见了中国bhikshuni体节动物她的道德和智力位置以这样直率的方式。I am auomplished in municipal speciality (Road and Bridge .Water and Waster Water )and engineering design consultation,I can also deal with argumentation of survey &vocation ISO9000 and engineering construct supenision consultation.的翻译是:我在市政专长auomplished (路和桥梁。水和浪费者水)和工程设计咨询,我可以也应付勘测&amp的辩论; 职业ISO9000和工程学修建supenision咨询。Results The content of MDA and activity of MPO were significantly reduced and the activity of SOD was enhanced in IPC group and I-post group compared with I/R group.的翻译是:发生MDA内容,并且显著减少了姆波的活动,并且草皮的活动在IPC小组和我岗位小组被提高了比较I/R小组。Then thou spakest in vision to thy holy one, and saidst, I have laid help upo I have exalted one chosen out of the people.的翻译是:Then thou spakest in vision to thy holy one, and saidst, I have laid help upo I have exalted one chosen out of the people.R is an APT ring if and only if R/I is an APT ring, where I is a nilpotent ideal of R. By (a), we prove that a separative abelian regular ring is an APT ring.的翻译是:R is an APT ring if only if R/I am an APT ring, where I am a nilpotent ideal of R. By (a), we prove that a separative abelian regular ring is an APT ring.my class stand is correct, my intentions are good and I understand all right, but I am not good at expressing myself and so the effect turns out bad.&的翻译是:my class stand is correct, my intentions are good and I understand all right, but I am not good at expressing myself and so the effect turns out bad.&LYNN CHEN: He helps me memorize my lines, he edits my acting reel and tapes my auditions, he gives me constructive criticism, and he is as enthusiastic as I am about any success that I have.的翻译是:林恩陈:他帮助我记住我的线,他编辑我的代理卷轴并且把我的试演录音,他给我建设性批评,并且他是一样热心的,象我关于我有的任何成功。On a few occasions when I was required to speak only in Mandarin or so it seemed, I tried to give order to my sentences and phrases in my head before spewing them out.的翻译是:I didnt have enough time and I knew that if you want to enter this kind of consulting company, your cover letter should be very different. But it was too difficult to write such a different letter.的翻译是:我没有足够的时间,并且我知道,如果您要输入这种咨询公司,您的说明附件应该是非常不同的。但是以至于不能写这样一封不同的信是太难的。&Where is our wandering girl tonight?& Tom looked away, but Emma was hard to stop. &I wonder,& she whispered, &if T-& (a man I hardly knew) &is on his lonesome.&的翻译是:& Where is our wandering girl tonight? & Tom looked away, but Emma was hard to stop. & I wonder,& she whispered, & if T-& (A man I hardly knew) & is on his lonesome.&I plunged into the alphabet-soup world of digital television (DTV) in 2003, shortly after I replaced my electron-gun boob tube with a 42-inch plasma flat panel.的翻译是:我浸入了入字母表汤世界数字电视(DTV)在2003年,在我用平板之后42英寸的等离子替换我的电子枪电视机。So I end with a land from a Latin voice who had heard the message more than fifteen hundred years ago death, death, clutch my ear, and says, live, I am coming.的翻译是:因此我以从听见了消息超过十五一百年前死亡的拉丁声音,死亡的土地结束,抓住我的耳朵,并且说,活,我来临。When my boyfriend and I saw each other the first time, I was totally mortified, and he was so dreaded out that he dropped his book on the floor.的翻译是:当我男朋友和我第一次互相看见了,我完全被克服,并且他很畏惧了他投下他的在地板上的书。I am certain that priceless wealth is in thee, and that thou art my best friend, but I have not the heart to sweep away the tinsel that fills my room.的翻译是:我肯定无价的财富在thee,并且你艺术我的最好的朋友,但是我有没有清扫的心脏填装我的室的闪亮金属片。But I have received everything in full a I am amply supplied, having received from Epaphroditus what you have sent, a fragrant aroma, an acceptable sacrifice, well-pleasing to God.的翻译是:But I have received everything in full a I am amply supplied, having received from Epaphroditus what you have sent, a fragrant aroma, an acceptable sacrifice, well-pleasing to God.The frequencies of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Dai population were 0.0,0.2030, The frequencies of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Chingpaw population were 0.000,0.0,respectively.的翻译是:CCR5delta32, CCR2b-64I, SDF1-3 ′ A等位基因频率在戴人口分别为0.0000, 0.2130, 0.2030,;CCR5delta32, CCR2b-64I, SDF1-3在Chingpaw人口的′ A等位基因频率分别为0.000, 0.1637, 0.1770。“What a fool you are to miss this opportunity of a higher salary!” “Perhaps, but a bargain’s a bargain. When I took the present job I promised to stay for at least two years.”的翻译是:&What a fool you are to miss this opportunity of a higher salary!& &Perhaps, but a bargain&#039;s a bargain. When I took the present job I promised to stay for at least two years.&I enter the timing hearing level in the university to be ordinary, belongs to “ he deaf person English”basically, “ ute English” but the first semester I have decided a plan, and defers to the plan assiduous training.的翻译是:In fact I will always carry its essence with me,because what it has given me will be a part of myself,I will carry it on my wings.的翻译是:实际上我永远将运载它的与我的精华,因为什么它给了我将是部分的我自己,我将运载它在我的翼。
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