我正在C#中为一个
winforms应用程序实现一个模糊日期控件.模糊日期应该能够采用模糊值
>去年六月
> 2小时前
> 2个月前
>上周
>昨天
>去年
等等
有没有“模糊”日期时间选择器的示例实现？
任何实现这种控制的想法都将不胜感激
解决方法
解析很简单.它可以被实现为一堆正则表达式和一些日期计算.
以下样品可以轻松扩展,以满足您的需要.
我已经大致测试了它,它至少可以用于以下字符串：
>下个月,明年,
>接下来的4个月,接下来3天
> 3天前,5小时前
>明天,昨天
>去年,上个月,
>最后一个星期,下个星期五
>上个六月,接下来可能,
> 2008年1月1日,
> 2019年6月,2009/01/01
助手类：
class FuzzyDateTime
{
static List<string> dayList = new List<string>() { "sun","mon","tue","wed","thu","fri","sat" };
static List<IDateTimePattern> parsers = new List<IDateTimePattern>()
{
new RegexDateTimePattern (
@"next +([2-9]\d*) +months",delegate (Match m) {
var val = int.Parse(m.Groups[1].Value);
return DateTime.Now.AddMonths(val);
}
),new RegexDateTimePattern (
@"next +month",delegate (Match m) {
return DateTime.Now.AddMonths(1);
}
),new RegexDateTimePattern (
@"next +([2-9]\d*) +days",delegate (Match m) {
var val = int.Parse(m.Groups[1].Value);
return DateTime.Now.AddDays(val);
}
),new RegexDateTimePattern (
@"([2-9]\d*) +months +ago",delegate (Match m) {
var val = int.Parse(m.Groups[1].Value);
return DateTime.Now.AddMonths(-val);
}
),new RegexDateTimePattern (
@"([2-9]\d*) days +ago",delegate (Match m) {
var val = int.Parse(m.Groups[1].Value);
return DateTime.Now.AddDays(-val);
}
),new RegexDateTimePattern (
@"([2-9]\d*) *h(ours)? +ago",new RegexDateTimePattern (
@"tomorrow",delegate (Match m) {
return DateTime.Now.AddDays(1);
}
),new RegexDateTimePattern (
@"today",delegate (Match m) {
return DateTime.Now;
}
),new RegexDateTimePattern (
@"yesterday",delegate (Match m) {
return DateTime.Now.AddDays(-1);
}
),new RegexDateTimePattern (
@"(last|next) *(year|month)",delegate (Match m) {
int direction = (m.Groups[1].Value == "last")? -1 :1;
switch(m.Groups[2].Value)
{
case "year":
return new DateTime(DateTime.Now.Year+direction,1,1);
case "month":
return new DateTime(DateTime.Now.Year,DateTime.Now.Month+direction,1);
}
return DateTime.MinValue;
}
),new RegexDateTimePattern (
String.Format(@"(last|next) *({0}).*",String.Join("|",dayList.ToArray())),//handle weekdays
delegate (Match m) {
var val = m.Groups[2].Value;
var direction = (m.Groups[1].Value == "last")? -1 :1;
var dayOfWeek = dayList.IndexOf(val.Substring(0,3));
if (dayOfWeek >= 0) {
var diff = direction*(dayOfWeek - (int)DateTime.Today.DayOfWeek);
if (diff <= 0 ) {
diff = 7 + diff;
}
return DateTime.Today.AddDays(direction * diff);
}
return DateTime.MinValue;
}
),new RegexDateTimePattern (
@"(last|next) *(.+)",// to parse months using DateTime.TryParse
delegate (Match m) {
DateTime dt;
int direction = (m.Groups[1].Value == "last")? -1 :1;
var s = String.Format("{0} {1}",m.Groups[2].Value,DateTime.Now.Year + direction);
if (DateTime.TryParse(s,out dt)) {
return dt;
} else {
return DateTime.MinValue;
}
}
),new RegexDateTimePattern (
@".*",//as final resort parse using DateTime.TryParse
delegate (Match m) {
DateTime dt;
var s = m.Groups[0].Value;
if (DateTime.TryParse(s,};
public static DateTime Parse(string text)
{
text = text.Trim().ToLower();
var dt = DateTime.Now;
foreach (var parser in parsers)
{
dt = parser.Parse(text);
if (dt != DateTime.MinValue)
break;
}
return dt;
}
}
interface IDateTimePattern
{
DateTime Parse(string text);
}
class RegexDateTimePattern : IDateTimePattern
{
public delegate DateTime Interpreter(Match m);
protected Regex regEx;
protected Interpreter inter;
public RegexDateTimePattern(string re,Interpreter inter)
{
this.regEx = new Regex(re);
this.inter = inter;
}
public DateTime Parse(string text)
{
var m = regEx.Match(text);
if (m.Success)
{
return inter(m);
}
return DateTime.MinValue;
}
}
用法示例：
var val = FuzzyDateTime.Parse(textBox1.Text); if (val != DateTime.MinValue) label1.Text = val.ToString(); else label1.Text = "unknown value";
