基本的 WPF 验证和数据绑定
本文关键字：数据绑定 验证 WPF | 更新日期: 2023-09-27 18:36:18
我刚刚开始使用WPF，特别是验证和数据绑定。
这是我的 XAML 代码
<Window x:Class="simpledatagrid.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="IDDATA" Height="350" Width="525">
<Grid >
<DataGrid SelectionChanged="Iddetails" Name="dgsample" BorderBrush="Black" BorderThickness="2" AutoGenerateColumns="True" CanUserAddRows="True" CanUserDeleteRows="True" CanUserSortColumns="False" Margin="200,10,10,75"></DataGrid>
<Label Content="ID :" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Height="26" Width="27"/>
<Label Content="Name :" HorizontalAlignment="Left" Margin="10,60,0,0" VerticalAlignment="Top" Height="26" Width="48"/>
<Label Content="Salary :" HorizontalAlignment="Left" Margin="10,110,0,0" VerticalAlignment="Top" Height="26" Width="47"/>
<TextBox Name="tb1" HorizontalAlignment="Left" Height="20" Margin="60,10,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100" />
<TextBox Name="tb2" HorizontalAlignment="Left" Height="20" Margin="60,60,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100"/>
<TextBox Name="tb3" HorizontalAlignment="Left" Height="20" Margin="60,110,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100"/>
<Button Content="Get" HorizontalAlignment="Left" Margin="10,190,0,0" VerticalAlignment="Top" Width="75" Click="Get_Click" />
<Button Content="Add" HorizontalAlignment="Left" Margin="10,230,0,0" VerticalAlignment="Top" Width="75" Click="Add_Click" />
<Button Content="Delete" HorizontalAlignment="Left" Margin="10,270,0,0" VerticalAlignment="Top" Width="75" Click="Delete_Click" />
</Grid>
这是我.CS代码
public partial class MainWindow : Window
{
ObservableCollection<User> Users = new ObservableCollection<User>();
public MainWindow()
{
InitializeComponent();
Users.Add(new User() { Id = 101, Name = "leon", Salary = 10 });
Users.Add(new User() { Id = 102, Name = "allen", Salary = 20 });
Users.Add(new User() { Id = 103, Name = "neon", Salary = 30 });
Users.Add(new User() { Id = 104, Name = "xeln", Salary = 40 });
Users.Add(new User() { Id = 105, Name = "kalen", Salary = 50 });
Users.Add(new User() { Id = 106, Name = "velen", Salary = 60 });
dgsample.ItemsSource = Users;
}
private void Iddetails(object sender, SelectionChangedEventArgs args)
{
int index = dgsample.SelectedIndex;
tb1.Text = Users[index].Id.ToString();
tb2.Text = Users[index].Name;
tb3.Text = Users[index].Salary.ToString();
}
private void Get_Click(object sender, RoutedEventArgs e)
{
int index;
if (int.TryParse(this.tb1.Text, out index))
{
User currentUser = Users.FirstOrDefault(Select => Select.Id == int.Parse(tb1.Text));
if (currentUser != null)
{
this.tb2.Text = currentUser.Name;
this.tb3.Text = currentUser.Salary.ToString();
}
else
MessageBox.Show("User with the provided ID does not Exist", "Error");
}
else
MessageBox.Show("ID entered is not valid number", "Error");
}
private void Add_Click(object sender, RoutedEventArgs e)
{
if (!tb1.Text.Equals(""))
{
var adduser = Users.Where(User => User.Id == int.Parse(tb1.Text));
if (!adduser.Any())
{
Users.Add(new User() { Id = int.Parse(tb1.Text), Name = tb2.Text, Salary = int.Parse(tb3.Text) });
}
else
MessageBox.Show("Someone already has that ID.");
}
}
private void Delete_Click(object sender, RoutedEventArgs e)
{
int index;
if (int.TryParse(this.tb1.Text, out index))
{
User currentUser = Users.FirstOrDefault(Select => Select.Id == int.Parse(tb1.Text));
if (currentUser != null)
{
Users.Remove(currentUser);
}
else
MessageBox.Show("User with the provided ID does not Exist", "Error");
}
else
MessageBox.Show("ID entered is not valid number", "Error");
}
}
这段代码是有效的，但我需要使用文本框的数据绑定和验证的概念来做同样的事情，请帮助我使用所需的代码
这可能会
对你有所帮助
<Binding Path="EventDate" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<ExceptionValidationRule />
</Binding.ValidationRules>
</Binding>
您也可以参考此链接http://www.codeproject.com/Articles/29054/WPF-Data-Binding-Part-1
好吧，
您将需要使用DataBinding重写它，这是创建数据绑定的一般概述，例如：
<TextBox Name="tb3" HorizontalAlignmentText="{Binding Path=SelectedIndex, ElementName=Grid, , Mode=OneWay}"/>
因此，让我解释一下，我使用以下模式将 TextBox tb3 Text属性绑定到元素Grid的以下属性SelctedIndex OneWay这意味着，更改网格中的选定索引将影响 tb3 Text但更改文本框中的Text不会影响实际Grid选择。有时，当属性类型不匹配时，您必须使用转换器，下面是一个示例：
msdn.microsoft.com
一般来说，它看起来很像这样，但请注意，您也可以在代码隐藏中绑定属性，但如果您可以更好地保留 xaml。
提示： 如果要使用绑定，则必须确保Path指向属性。
最后，以下是有关验证的更多信息的链接，您应该查看：
新增：www.codeproject.com
所以问题
blogs.msdn.com
或代码隐藏（不推荐）
private void tb1_TextChanged(object sender, TextChangedEventArgs e)
{
int output;
if (!int.TryParse(tb1.Text, out output))
{
MessageBox.Show("Enter valid int.");
tb1.Text = "0";
}
}
有关数据绑定的有用链接：
msdn.microsoft.com
在这里，我为您提供tb2文本框的绑定和转换器，以显示当前选定的用户name：
将此类添加到命名空间：
using System;
using System.Globalization;
using System.Windows.Data;
namespace WpfApplicationTest
{
[ValueConversion(typeof(object), typeof(String))]
public class MyConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
string name = "";
if (value != null)
{
User user = (User)value;
name = user.Name;
}
else
{
name = "";
}
return name;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
}
}
然后将其添加到您的窗口中：
xmlns:myNamespace="clr-namespace:WpfApplicationTest"
<Window.Resources>
<myNamespace:MyConverter x:Key="myConverter"/>
</Window.Resources>
然后像这样编辑文本框：
<TextBox Name="tb2" Text="{Binding Path=SelectedItem, ElementName=Grid, Mode=OneWay, Converter={StaticResource myConverter}}"/>
你需要做的 首先阅读有关 MVVM 的信息。
您似乎正在使用 wpf 作为 winforms，这很糟糕。
当你读完关于mvvm的文章时（比如说一周左右），阅读这些文章。
IDataErrorInfo 是你要找的：
http://codeblitz.wordpress.com/2009/05/08/wpf-validation-made-easy-with-idataerrorinfo/
http://tarundotnet.wordpress.com/2011/03/03/wpf-tutorial-how-to-use-idataerrorinfo-in-wpf/