我刚刚开始使用WPF，尤其是Validations和DataBinding。
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>
这是我的.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");
}
}
这段代码正在运行，但是我需要使用DataBinding和TextBoxes验证的概念，请帮我提供所需的代码
答案 0 :(得分：2)
这可能会对你有所帮助
<Binding Path="EventDate" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<ExceptionValidationRule />
</Binding.ValidationRules>
</Binding>
你也可以参考这个链接 http://www.codeproject.com/Articles/29054/WPF-Data-Binding-Part-1
答案 1 :(得分：1)
首先需要做的是阅读MVVM。
你似乎正在使用wpf作为winforms，这会耗费大量时间。
当你读完关于mvvm的文章时（比如说在一周左右......），请阅读这些文章。
您正在寻找IDataErrorInfo：
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/
答案 2 :(得分：1)
那么你可以使用DataBinding重写它，这是关于创建数据绑定的一般概述，例如：
<TextBox Name="tb3" HorizontalAlignmentText="{Binding Path=SelectedIndex, ElementName=Grid, , Mode=OneWay}"/>
让我解释一下，我已使用以下模式Text将TextBox tb3的{{1}}属性绑定到元素SelctedIndex的以下属性Grid ，更改网格中选定的索引将影响tb3 OneWay，但更改文本框中的Text不会影响实际的Text选择。有时，当属性类型不匹配时，您必须使用转换器，这是一个示例：
一般来说，它看起来非常像这样，但请注意，你也可以在代码隐藏中绑定这些属性，但是如果你能更好地保留到xaml。
提示：如果您想使用绑定，您必须确保Grid指向属性。
最后，这里有链接，您可以查看有关验证的更多信息：
或代码隐藏（不推荐）
Path有关DataBinding的有用链接：
在这里，我为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";
}
}
TextBox提供绑定和转换，以显示当前选定的用户tb2：
将此类添加到命名空间：
name然后将此添加到您的窗口：
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;
}
}
}
xmlns:myNamespace="clr-namespace:WpfApplicationTest"然后像这样编辑你的TextBox：
<Window.Resources>
<myNamespace:MyConverter x:Key="myConverter"/>
</Window.Resources>