在MahApps控件中，表单加载时的验证事件引发，我需要在单击按钮后显示验证消息
本文关键字：验证 按钮 消息 显示 单击 事件 控件 MahApps 表单 加载 | 更新日期: 2023-09-27 18:25:49
IDataErrorInfo：验证页面何时提交
这里我使用IdataErrorInfo
下面是我的主窗口ViewModel类COde
using System;
using System.Collections.Generic;
using System.Linq;
using System.ComponentModel;
using System.Globalization;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using MahApps.Metro;
using MetroDemo.Models;
using System.Windows.Input;
using MahApps.Metro.Controls;
using MahApps.Metro.Controls.Dialogs;
namespace MetroDemo
{
public class AccentColorMenuData
{
public string Name { get; set; }
public Brush BorderColorBrush { get; set; }
public Brush ColorBrush { get; set; }
private ICommand changeAccentCommand;
public ICommand ChangeAccentCommand
{
get { return this.changeAccentCommand ?? (changeAccentCommand = new SimpleCommand { CanExecuteDelegate = x => true, ExecuteDelegate = x => this.DoChangeTheme(x) }); }
}
protected virtual void DoChangeTheme(object sender)
{
var theme = ThemeManager.DetectAppStyle(Application.Current);
var accent = ThemeManager.GetAccent(this.Name);
ThemeManager.ChangeAppStyle(Application.Current, accent, theme.Item1);
}
}
public class AppThemeMenuData : AccentColorMenuData
{
protected override void DoChangeTheme(object sender)
{
var theme = ThemeManager.DetectAppStyle(Application.Current);
var appTheme = ThemeManager.GetAppTheme(this.Name);
ThemeManager.ChangeAppStyle(Application.Current, theme.Item2, appTheme);
}
}
public class MainWindowViewModel : INotifyPropertyChanged, IDataErrorInfo
{
private readonly IDialogCoordinator _dialogCoordinator;
int? _integerGreater10Property;
int? _emptystring;
private bool _animateOnPositionChange = true;
public MainWindowViewModel(IDialogCoordinator dialogCoordinator)
{
_dialogCoordinator = dialogCoordinator;
SampleData.Seed();
// create accent color menu items for the demo
this.AccentColors = ThemeManager.Accents
.Select(a => new AccentColorMenuData() { Name = a.Name, ColorBrush = a.Resources["AccentColorBrush"] as Brush })
.ToList();
// create metro theme color menu items for the demo
this.AppThemes = ThemeManager.AppThemes
.Select(a => new AppThemeMenuData() { Name = a.Name, BorderColorBrush = a.Resources["BlackColorBrush"] as Brush, ColorBrush = a.Resources["WhiteColorBrush"] as Brush })
.ToList();
Albums = SampleData.Albums;
Artists = SampleData.Artists;
FlipViewTemplateSelector = new RandomDataTemplateSelector();
FrameworkElementFactory spFactory = new FrameworkElementFactory(typeof(Image));
spFactory.SetBinding(Image.SourceProperty, new System.Windows.Data.Binding("."));
spFactory.SetValue(Image.HorizontalAlignmentProperty, HorizontalAlignment.Stretch);
spFactory.SetValue(Image.StretchProperty, Stretch.Fill);
FlipViewTemplateSelector.TemplateOne = new DataTemplate()
{
VisualTree = spFactory
};
FlipViewImages = new string[] { "http://trinities.org/blog/wp-content/uploads/red-ball.jpg", "http://savingwithsisters.files.wordpress.com/2012/05/ball.gif" };
RaisePropertyChanged("FlipViewTemplateSelector");
BrushResources = FindBrushResources();
CultureInfos = CultureInfo.GetCultures(CultureTypes.InstalledWin32Cultures).ToList();
}
public string Title { get; set; }
public int SelectedIndex { get; set; }
public List<Album> Albums { get; set; }
public List<Artist> Artists { get; set; }
public List<AccentColorMenuData> AccentColors { get; set; }
public List<AppThemeMenuData> AppThemes { get; set; }
public List<CultureInfo> CultureInfos { get; set; }
public int? IntegerGreater10Property
{
get { return this._integerGreater10Property; }
set
{
if (Equals(value, _integerGreater10Property))
{
return;
}
_integerGreater10Property = value;
RaisePropertyChanged("IntegerGreater10Property");
}
}
public string FirstName { get; set; }
public string LastName { get; set; }
DateTime? _datePickerDate;
public DateTime? DatePickerDate
{
get { return this._datePickerDate; }
set
{
if (Equals(value, _datePickerDate))
{
return;
}
_datePickerDate = value;
RaisePropertyChanged("DatePickerDate");
}
}
bool _magicToggleButtonIsChecked = true;
public bool MagicToggleButtonIsChecked
{
get { return this._magicToggleButtonIsChecked; }
set
{
if (Equals(value, _magicToggleButtonIsChecked))
{
return;
}
_magicToggleButtonIsChecked = value;
RaisePropertyChanged("MagicToggleButtonIsChecked");
}
}
private bool _quitConfirmationEnabled;
public bool QuitConfirmationEnabled
{
get { return _quitConfirmationEnabled; }
set
{
if (value.Equals(_quitConfirmationEnabled)) return;
_quitConfirmationEnabled = value;
RaisePropertyChanged("QuitConfirmationEnabled");
}
}
}
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
/// <summary>
/// Raises the PropertyChanged event if needed.
/// </summary>
/// <param name="propertyName">The name of the property that changed.</param>
protected virtual void RaisePropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public string this[string columnName]
{
get
{
if (columnName == "IntegerGreater10Property" && this.IntegerGreater10Property < 10)
{
return "Number is not greater than 10!";
}
if (columnName == "DatePickerDate" && this.DatePickerDate == null)
{
return "No Date given!";
}
if (columnName == "FirstName")
{
if (string.IsNullOrEmpty(FirstName) || FirstName.Length < 3)
return "Please Enter First Name";
}
if (columnName == "LastName")
{
if (string.IsNullOrEmpty(FirstName) || FirstName.Length < 3)
return "Please Enter Last Name";
}
return null;
}
}
public string Error { get { return string.Empty; } }
private ICommand singleCloseTabCommand;
public ICommand SingleCloseTabCommand
{
get
{
return this.singleCloseTabCommand ?? (this.singleCloseTabCommand = new SimpleCommand
{
CanExecuteDelegate = x => true,
ExecuteDelegate = async x =>
{
await ((MetroWindow) Application.Current.MainWindow).ShowMessageAsync("Closing tab!", string.Format("You are now closing the '{0}' tab", x));
}
});
}
}
private ICommand neverCloseTabCommand;
public ICommand NeverCloseTabCommand
{
get { return this.neverCloseTabCommand ?? (this.neverCloseTabCommand = new SimpleCommand { CanExecuteDelegate = x => false }); }
}
private ICommand showInputDialogCommand;
public ICommand ShowInputDialogCommand
{
get
{
return this.showInputDialogCommand ?? (this.showInputDialogCommand = new SimpleCommand
{
CanExecuteDelegate = x => true,
ExecuteDelegate = x =>
{
_dialogCoordinator.ShowInputAsync(this, "From a VM", "This dialog was shown from a VM, without knowledge of Window").ContinueWith(t => Console.WriteLine(t.Result));
}
});
}
}
private ICommand showProgressDialogCommand;
public ICommand ShowProgressDialogCommand
{
get
{
return this.showProgressDialogCommand ?? (this.showProgressDialogCommand = new SimpleCommand
{
CanExecuteDelegate = x => true,
ExecuteDelegate = x => RunProgressFromVm()
});
}
}
}
}
下面是我的XAml代码
<TextBox Name="txt_LA_FirstName"
Controls:TextBoxHelper.Watermark="First Name"
Controls:TextBoxHelper.UseFloatingWatermark="True"
ToolTip="First Name" Grid.Row="2" Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Stretch" Text="{Binding FirstName, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged, NotifyOnValidationError=True}" />
事件在表单加载时引发并显示错误消息在用户输入任何值之前>我需要在按钮单击事件之后显示错误消息
之所以得到它，是因为索引器的内容是静态的，所以View在绑定过程中对其进行验证。不过，您应该只在属性更改时对其进行验证。
您应该为带有Add/Remove方法的错误字典提供一个后备字段，比如这个
private readonly Dictionary<string, string> errors = new Dictionary<string, string>();
public string this[string columnName]
{
get
{
string errorMessage = null;
if (errors.TryGetValue(columnName, errorMessage)
{
return errorMessage;
}
return null;
}
}
protected void AddErrorMessage(string columnName, string errorMessage)
{
errors[columnName] = errorMessage;
}
protected void RemoveErrorMessage(string columnName)
{
if(errors.ContainsKey(columnName))
{
errors.Remove(columnName);
}
}
protected virtual void Validate()
{
errors.Clear();
if (this.IntegerGreater10Property < 10)
{
this.AddErrorMessage("IntegerGreater10Property", "Number is not greater than 10!");
}
if (this.DatePickerDate == null)
{
this.AddErrorMessage("DatePickerDate", "No Date given!");
}
if (string.IsNullOrEmpty(FirstName) || FirstName.Length < 3)
{
this.AddErrorMessage("FirstName", "Please Enter First Name");
}
if (string.IsNullOrEmpty(LastName) || Lastname.Length < 3)
{
this.AddErrorMessage("LastName", "Please Enter Last Name");
}
}
然后用RemoveMessage("FirstName")删除它们，或者在验证时将其清除。当然，您应该在基类中实现这一点，以避免反复重复此代码，并只覆盖ViewModel类
Validate()方法感谢您的回复
即使我尝试过，我也通过在Bool变量上创建并在MainwindowView模型类中将其声明为False来解决问题。
除非Bool变量为True，否则不会验证
按钮点击事件I将使布尔变量为True，然后在按钮click 上启动Validates
if (Enable)
{
if (columnName == "IntegerGreater10Property" && this.IntegerGreater10Property < 10)
{
return "Number is not greater than 10!";
}
if (columnName == "DatePickerDate" && this.DatePickerDate == null)
{
return "No Date given!";
}
if (columnName == "FirstName")
{
if (string.IsNullOrEmpty(FirstName) || FirstName.Length < 3)
return "Please Enter First Name";
}
if (columnName == "LastName")
{
if (string.IsNullOrEmpty(FirstName) || FirstName.Length < 3)
return "Please Enter Last Name";
}
}
return null;
下面是我的按钮点击事件（在按钮上，我将启用Bool属性为真正的
var x = (MainWindowViewModel)DataContext;
x.Enable = true;
var binding = txt_LA_FirstName.GetBindingExpression(TextBox.TextProperty);
binding.UpdateSource();