回答編集履歴
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追記
test
CHANGED
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@@ -3,3 +3,165 @@
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クラスの方でプロパティのセッターを工夫し、何か値が入れられたらそれを検証してプロパティの値を調整するようにしてください。
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# 追記
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XAML
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```C#
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<Window x:Class="WpfApp1.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:local="clr-namespace:WpfApp1"
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mc:Ignorable="d"
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Title="MainWindow" Height="450" Width="800">
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<Window.DataContext>
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<local:ViewModel/>
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</Window.DataContext>
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<Grid>
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<Grid.RowDefinitions>
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<RowDefinition Height="Auto"/>
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<RowDefinition/>
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</Grid.RowDefinitions>
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<Grid.ColumnDefinitions>
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<ColumnDefinition/>
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<ColumnDefinition Width="Auto"/>
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</Grid.ColumnDefinitions>
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<TextBox Grid.Row="0" Grid.Column="0" Text="{Binding TextValue}"/>
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<Button Grid.Row="0" Grid.Column="1">Click</Button>
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</Grid>
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</Window>
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```
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ViewModel.cs
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```C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Runtime.CompilerServices;
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namespace WpfApp1
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{
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public class ViewModel : INotifyPropertyChanged
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{
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#region INotifyPropertyChanged
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public event PropertyChangedEventHandler PropertyChanged;
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protected virtual void OnPropertyChanged(string propertyName)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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protected bool SetProperty<T>(ref T field, T value, [CallerMemberName]string propertyName = null)
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{
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if (EqualityComparer<T>.Default.Equals(field, value)) return false;
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field = value;
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OnPropertyChanged(propertyName);
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return true;
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}
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#endregion
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private string textValue;
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public string TextValue
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{
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get => textValue;
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set
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{
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if (DateTime.TryParse(value, out DateTime dateTime))
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{
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value = dateTime.ToString("yyyy/MM/dd");
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}
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else if (int.TryParse(value, out int i))
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{
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value = i.ToString("N0");
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}
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else if (double.TryParse(value, out double d))
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{
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value = d.ToString("N2");
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}
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SetProperty(ref textValue, value);
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}
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}
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}
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}
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```
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