C# 解析日期字符串以获取年份
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Parsing a date string to get the year
提问by user1204195
I have a string variable that stores a date like "05/11/2010".
我有一个存储日期的字符串变量，如“05/11/2010”。
How can I parse the string to get only the year?
如何解析字符串以仅获取年份？
So I will have another year variable like year = 2010.
所以我将有另一个年份变量，如year = 2010.
回答by dtb
You can use the DateTime.Parse Methodto parse the string to a DateTimevalue which has a Year Property:
您可以使用DateTime.Parse 方法将字符串解析为具有Year 属性的DateTime值：
var result = DateTime.Parse("05/11/2010").Year;
// result == 2010
Depending on the culture settings of the operating system, you may need to provide a CultureInfo:
根据操作系统的文化设置，您可能需要提供CultureInfo：
var result = DateTime.Parse("05/11/2010", new CultureInfo("en-US")).Year;
// result == 2010
回答by Josh Mein
This should work for you.
这应该对你有用。
string myDate = "05/11/2010";
DateTime date = Convert.ToDateTime(myDate);
int year = date.Year;
回答by Sergey Brunov
If the date string format is fixed (dd/MM/yyyy), I would like to recommend you using DateTime.ParseExact Method.
如果日期字符串格式是固定的（dd/MM/yyyy），我建议您使用DateTime.ParseExact Method。
The code:
编码：
const string dateString = "12/02/2012";
CultureInfo provider = CultureInfo.InvariantCulture;
// Use the invariant culture for the provider parameter,
// because of custom format pattern.
DateTime dateTime = DateTime.ParseExact(dateString, "dd/MM/yyyy", provider);
Console.WriteLine(dateTime);
Also I think it might be a little bit faster than DateTime.Parse Method, because the Parse method tries parsing several representations of date-time string.
另外我认为它可能比DateTime.Parse Method快一点，因为 Parse 方法尝试解析日期时间字符串的几种表示形式。
回答by Ramgy Borja
you could also used Regexto get the yearin the string "05/11/2010"
您还可以使用Regex在字符串“05/11/2010”中获取年份
public string getYear(string str)
{
return (string)Regex.Match(str, @"\d{4}").Value;
}
var result = getYear("05/11/2010");
2010
回答by John Pittaway
Variant of dtb that I use:
我使用的 dtb 变体：
string Year = DateTime.Parse(DateTime.Now.ToString()).Year.ToString();
