如何检查日期时间年份是否增加1年？ [英] How to check if the date time year adds 1 year?

问题描述

我想要一个if语句，如下所示：

 int yrcount = 18; 
 SR_txtyr.Text = yrcount.ToString（）; 
 
如果year.now加1则
 yrcount加1 

基本上，我想要它要做的是，如果日期进行到明年，我的变量加1。



文本框被禁用，因此无法更改。这是每年更改的文档编号的更多部分。



我尝试了什么：



我不知道日期时间是如何工作的，遗憾的是。

解决方案

如果我理解你的话......



要获得当年，请使用：

  int  currentyear = DateTime.Today.Year; 

或（甚至更好）：

 DateTime currentdate = DateTime.Today; 
  int  currentyear = currentdate.Year; 

进一步详情请参阅：日期时间结构（系统） [ ^ ]

 DateTime currentdate = DateTime。今天; 
 DateTime nextyeardate = DateTime.Today.AddMonths（ 8 ）; 
  int  currentyear = currentdate.Year; 
  int  nextyear = nextyeardate.Year; 
 
  if （nextyear-currentyear ==  1 ）
 { 
 Console.WriteLine（ 明年！）; 
} 
  else  
 {
 Console.WriteLine（  :(）; 
} 

< a href =https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/if-else> if-else（C＃参考）| Microsoft Docs [ ^ ]

I want to have an if statement that goes like this:

int yrcount = 18;
SR_txtyr.Text = yrcount.ToString();

If year.now adds 1 then
yrcount adds 1

Basically, I want it to do is add 1 into my variable if the date proceeds to next year.

The textbox is disabled so it can't be altered. It's more part of a document number that changes every year.

What I have tried:

I don't know how date time works, sadly.

解决方案

If i understand you properly...

To get current year, use this:

int currentyear = DateTime.Today.Year;

or (even better):

DateTime currentdate = DateTime.Today;
int currentyear = currentdate.Year;

For further details, please see: DateTime Structure (System)[^]

[EDIT]

DateTime currentdate = DateTime.Today;
DateTime nextyeardate = DateTime.Today.AddMonths(8);
int currentyear = currentdate.Year;
int nextyear = nextyeardate.Year;

if (nextyear-currentyear==1)
{
	Console.WriteLine("Next year!");
}
else
{
	Console.WriteLine(":(");
}

if-else (C# Reference) | Microsoft Docs[^]

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