WPF中的日期验证. [英] Date validation in WPF.

问题描述

我想验证以dd/mm/yyyy格式输入的日期.使用exceptionvalidation，仅当日期以mm/dd/yyyy格式输入时，我才能正确验证.有人可以建议一些解决方法吗?

I want to validate the date entered in the format dd/mm/yyyy. Using exceptionvalidation I can validate correctly only if the date is entered in the format mm/dd/yyyy. Can anyone suggest some workarounds?

推荐答案

什么是"exceptionvalidation"?那是一堂课吗?一项技术?您是否尝试过使用正则表达式进行验证?这是有关如何执行此操作的文章: WPF中的正则表达式验证

What is "exceptionvalidation"? Is that a class? A technique? Have you tried validating with a regular expression? Here is an article on how to do that: Regex Validation in WPF

您尝试过IDataErrorInfo接口吗?

http://www.abhisheksur.com/2010/06/validate-your-application- using.html [^ ]

Did you try IDataErrorInfo interfacE ?

http://www.abhisheksur.com/2010/06/validate-your-application-using.html[^]

以下是我解决它的方法.谁能告诉我做同一件事的正确方法是什么?这似乎是个坏主意.

The following is the way i solved it. Can anyone tell me whats the correct way to go about doing the same thing? This just seems like bad idea..

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.Windows.Controls;
using System.Windows.Data;
namespace Demo
{
    class DateDemo
    {
        private DateTime? _date=null;
        public DateTime? Date
        {
            get {
                return this._date;
            }
            set
            {
                this._date = (DateTime)value;
            }
        }
    }
    class CheckDate : ValidationRule
    {
        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            try
            {
                //CultureInfo culture = CultureInfo.CreateSpecificCulture("en-AU");
                Convert.ToDateTime(value.ToString());
                return new ValidationResult(true, "Valid Date");
            }
            catch
            {
                return new ValidationResult(false, "Invalid Date");
            }
        }
    }
    class DateConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null) return System.Convert.ToDateTime(value);
            else return null;
        }
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                int day; int month; int year;
                string date = value.ToString();
                try
                {
                    int.TryParse(date.Substring(0, 2), out day);
                    int.TryParse(date.Substring(3, 2), out month);
                    int.TryParse(date.Substring(6, 4), out year);
                    return new DateTime(year, month, day);
                }
                catch
                {
                    return new Exception("Please Enter Date in DD/MM/YYYY format");
                }
            }
            else
            {
                throw new Exception("Please Enter Date in DD/MM/YYYY format");
            }
        }
    }
}

<TextBox Name="txtDate" DataContext="{Binding}">
                <TextBox.Text>
                    <Binding Path="Date" StringFormat="{}{0:dd/MM/yyyy}" TargetNullValue="Please enter the date in DD/MM/YYYY format" Converter="{StaticResource converter}" UpdateSourceTrigger="LostFocus">
                        <Binding.ValidationRules>
                            <local:CheckDate />
                        </Binding.ValidationRules>
                    </Binding>
                </TextBox.Text>
            </TextBox

>

>

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