wcf 简单实践数据绑定数据校验

1.概要

1.1 说明

数据校验，如果数据不合适，有提示。

1.2 要点

class User : IDataErrorInfo
this.DataContext = user;
<Window.Resources>
<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self},Path=(Validation.Errors)[0].ErrorContent}"></Setter>
Text="{Binding Path=Name,ValidatesOnDataErrors=True,UpdateSourceTrigger=PropertyChanged}"

2.代码

2.1 xaml

<Window x:Class="WpfApp7.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:WpfApp7"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800"><Window.Resources><local:User x:Key="usecheck"></local:User><Style TargetType="TextBox"><Setter Property="Background" Value="#ddd"></Setter><Setter Property="Foreground" Value="Red"></Setter><Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self},Path=(Validation.Errors)[0].ErrorContent}"></Setter></Style></Window.Resources><StackPanel><StackPanel.DataContext><Binding Source="{StaticResource usecheck}"></Binding></StackPanel.DataContext><WrapPanel><TextBlock Text="姓名"></TextBlock><TextBox Name="Name" Text="{Binding Path=Name,ValidatesOnDataErrors=True,UpdateSourceTrigger=PropertyChanged}" Width="200"></TextBox></WrapPanel><WrapPanel><TextBlock Text="年龄"></TextBlock><TextBox Name="Age" Text="{Binding Path=Age,ValidatesOnDataErrors=True,UpdateSourceTrigger=PropertyChanged}" Width="200"></TextBox></WrapPanel></StackPanel>
</Window>

2.2 code

using System.ComponentModel;
using System.Windows;namespace WpfApp7
{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>public partial class MainWindow : Window{User user = new User();public MainWindow(){InitializeComponent();this.DataContext = user;}}class User : IDataErrorInfo{public User(){this.Name = "dd";this.Age = 20;}public string this[string columnName] {get {string ret = null;switch (columnName){case "Name":if (this.Name.Length <2|| this.Name.Length>3){return "不合格Name";}break;case "Age":if(this.Age<0|| this.Age > 200){return "不合格Age";}break;}return null;}}public String Name { get; set; }public int Age { get; set; } = 0;public string Error => throw new NotImplementedException();}
}