Wpf 自定义日期选择器用户控件 [英] Wpf custom datepicker user control

问题描述

我想创建一个用户控件来从用户那里获取日期.它应该有三个文本框，一个表示年、月和日.我不知道如何创建它.

I want to create a user control for getting a date from the user. It should have three textboxes, one for year, month and day. I don't know how to create it.

<UserControl x:Class="UI.WPF.CustomControls.ChooseDateControl"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d" 
         x:Name="chooseDateControl"
         xmlns:custom="clr-namespace:UI.WPF.CustomControls"
         d:DesignHeight="26" d:DesignWidth="181" FontFamily="Tahoma">

<DockPanel LastChildFill="True">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1.5*" />
            <ColumnDefinition Width="14" />
            <ColumnDefinition Width="1*" />
            <ColumnDefinition Width="14" />
            <ColumnDefinition Width="1*" />
        </Grid.ColumnDefinitions>

        <Label Content="/" Grid.Column="1" />
        <Label Content="/" Grid.Column="3" />

        <custom:NumericTextBox x:Name="txtYear" ToolTip="سال" Text="{Binding ElementName=chooseDateControl, Mode=TwoWay, Path=Year}" MaxLength="4" TabIndex="2" MinWidth="20" />
        <custom:NumericTextBox x:Name="txtMonth" Grid.Column="2" ToolTip="ماه" Text="{Binding ElementName=chooseDateControl, Mode=TwoWay, Path=Month}" MaxLength="2" TabIndex="1" MinWidth="20" />
        <custom:NumericTextBox x:Name="txtDay" Grid.Column="4" ToolTip="روز" Text="{Binding ElementName=chooseDateControl, Mode=TwoWay, Path=Day}" MaxLength="2" TabIndex="0" MinWidth="20" />
    </Grid>
</DockPanel>

背后的代码

public partial class ChooseDateControl : UserControl
{
    public static readonly DependencyProperty ValueProperty;
    public static readonly DependencyProperty YearProperty;
    public static readonly DependencyProperty MonthProperty;
    public static readonly DependencyProperty DayProperty;

    static ChooseDateControl()
    {
        ValueProperty = DependencyProperty.Register(
            "Value",
            typeof(DateTime), typeof(ChooseDateControl),
            new FrameworkPropertyMetadata(DateTime.MinValue));

        ValueProperty = DependencyProperty.Register(
            "Year",
            typeof(int), typeof(ChooseDateControl),
            new FrameworkPropertyMetadata((int)0));

        ValueProperty = DependencyProperty.Register(
            "Month",
            typeof(int), typeof(ChooseDateControl),
            new FrameworkPropertyMetadata((int)0));

        ValueProperty = DependencyProperty.Register(
            "Day",
            typeof(int), typeof(ChooseDateControl),
            new FrameworkPropertyMetadata((int)0));
    }

    public ChooseDateControl()
    {
        InitializeComponent();
    }

    public DateTime Value
    {
        get
        {
            return (DateTime)base.GetValue(ValueProperty);
        }
        set
        {
            base.SetValue(ValueProperty, value);
        }
    }

    public int Year
    {
        get
        {
            return (int)base.GetValue(YearProperty);
        }
        set
        {
            base.SetValue(YearProperty, value);
        }
    }

    public int Month
    {
        get
        {
            return (int)base.GetValue(MonthProperty);
        }
        set
        {
            base.SetValue(MonthProperty, value);
        }
    }

    public int Day
    {
        get
        {
            return (int)base.GetValue(DayProperty);
        }
        set
        {
            base.SetValue(DayProperty, value);
        }
    }
}

它不能正常工作——它返回默认值，即 DateTime.MinValue.请帮帮我.

It doesn't work correctly-- it returns the default value, which is DateTime.MinValue. Please help me.

推荐答案

像这样编写逻辑可能会更好:

It might be better writing the logic kind of like this:

static void Main(string[] args)
{
    Console.WriteLine("Year");
    var year = Int32.Parse(Console.ReadLine());
    Console.WriteLine("Month");
    var month = Int32.Parse(Console.ReadLine());
    Console.WriteLine("Day");
    var day = Int32.Parse(Console.ReadLine());

    var customDate = new DateTime(year, month, day);

    Console.WriteLine(customDate);
    Console.ReadLine();
}

您可以实现类似的功能，例如拥有一个按钮，按下该按钮时将获取值并创建新的日期时间值.有很多方法可以从输入值生成 DateTime，只需在网上冲浪，您就会在 WPF 中找到大量关于此的示例和教程.希望这会给你一些想法并帮助你.

You could implement something similar like having a button that when pressed will get the values and create a new datetime value. There are many ways of generating a DateTime from input values just surf the web and you will find a ton of examples and tutorials about this in WPF. Hopefully this will give you some idea's and help you out.

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