C# 字符串转DateTime
将文本正确转换为 DateTime 需要执行三个子任务:1、正确格式的日期和时间字符串。2、区域性,不同地区的日期和时间表示格式有区别,字符串格式有区别。3、指定转换格式,例如转换后的DateTime,可能没有时间部分。
使用Parse转换和TryParse转换:
string dateInput = "Jan 1, 2009"; DateTime parsedDate = DateTime.Parse(dateInput); Console.WriteLine($"默认区域{CultureInfo.CurrentCulture.Name}:"+parsedDate); // 说明字符串格式是en-us区域 DateTime parsedDate1 = DateTime.Parse(dateInput,new CultureInfo("en-us")); Console.WriteLine("使用en-us:" + parsedDate1); // name不区分大小写 // public CultureInfo(string name); CultureInfo MyCultureInfo = new CultureInfo("de-DE"); string MyString = "12 Juni 2008"; DateTime MyDateTime = DateTime.Parse(MyString, MyCultureInfo); Console.WriteLine(MyDateTime);
DateTime dateTime; DateTime.TryParse("Jan 1, 2009",new CultureInfo("en-us"),DateTimeStyles.None,out dateTime);
ParseExact:可以定义字符串转换格式,可以是标准格式中的一种,也可以是自定义格式,但未必都能转换成功。CultureInfo.InvariantCulture了解:https://www.cnblogs.com/GreenLeaves/p/6757917.html
string dateString, format; DateTime result; var provider = new CultureInfo("fr-FR"); dateString = "18/08/2015 06:30:15.006542"; // 自定义格式 format = "dd/MM/yyyy HH:mm:ss.ffffff"; try { result = DateTime.ParseExact(dateString, format, provider); Console.WriteLine("{0} converts to {1}.", dateString, result.ToString()); } catch (FormatException) { Console.WriteLine("{0} is not in the correct format.", dateString); } // Parse date-only value with invariant culture. provider = CultureInfo.InvariantCulture; dateString = "06/15/2008"; format = "d"; try { result = DateTime.ParseExact(dateString, format, provider); Console.WriteLine("{0} converts to {1}.", dateString, result.ToString()); } catch (FormatException) { Console.WriteLine("{0} is not in the correct format.", dateString); }
查看有哪些CultureInfo。CultureInfo.GetCultures(CultureTypes.AllCultures)。
量变会引起质变。