我一直试图通过模板10验证来重现最简单的验证逻辑，但我只是不明白。
我在github的例子中创建了我的模型，就像wiki一样：
public class User : ValidatableModelBase
{
//public User()
//{
// FirstName = string.Empty;
// LastName = string.Empty;
// Validator = i =>
// {
// var u = i as User;
// if (string.IsNullOrEmpty(u.FirstName))
// u.Properties[nameof(u.FirstName)].Errors.Add("The first name is required");
// else if (u.FirstName.Length <= 3)
// u.Properties[nameof(u.FirstName)].Errors.Add("First Name must be greater than 3 chars.");
// if (string.IsNullOrEmpty(u.LastName))
// u.Properties[nameof(u.LastName)].Errors.Add("The last name is required");
// else if (u.LastName.Length <= 3)
// u.Properties[nameof(u.LastName)].Errors.Add("Last Name must be greater than 3 chars.");
// };
//}
public int Id { get; set; }
public string FirstName
{
get
{
return Read<string>();
}
set
{
Write(value);
}
}
public string LastName
{
get
{
return Read<string>();
}
set
{
Write(value);
}
}
public override string ToString() => $"{FirstName} {LastName}";
}
你可以看到我甚至创建了一个构造函数来初始化我的Object，我注释掉了因为我想在我的ViewModel构造函数中初始化值。
然后我的视图模型就是这样：
public class MainPageViewModel : ViewModelBase
{
public MainPageViewModel()
{
User = new User
{
FirstName = string.Empty,
LastName = string.Empty,
Validator = i =>
{
var u = i as User;
if (string.IsNullOrEmpty(u.FirstName))
u.Properties[nameof(u.FirstName)].Errors.Add("The first name is required");
else if (u.FirstName.Length <= 3)
u.Properties[nameof(u.FirstName)].Errors.Add("First Name must be greater than 3 chars.");
if (string.IsNullOrEmpty(u.LastName))
u.Properties[nameof(u.LastName)].Errors.Add("The last name is required");
else if (u.LastName.Length <= 3)
u.Properties[nameof(u.LastName)].Errors.Add("Last Name must be greater than 3 chars.");
},
};
}
private User _User;
public User User
{
get { return _User; }
set { _User = value; }
}
public override async Task OnNavigatedToAsync(object parameter, NavigationMode mode, IDictionary<string, object> suspensionState)
{
User.Validate();
await Task.CompletedTask;
}
public override async Task OnNavigatingFromAsync(NavigatingEventArgs args)
{
args.Cancel = false;
await Task.CompletedTask;
}
public void GotoSettings() =>
NavigationService.Navigate(typeof(Views.SettingsPage), 0);
public void GotoPrivacy() =>
NavigationService.Navigate(typeof(Views.SettingsPage), 1);
public void GotoAbout() =>
NavigationService.Navigate(typeof(Views.SettingsPage), 2);
}
现在我认为我所拥有的就是：
<Page x:Class="ValidationSample.Views.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Behaviors="using:Template10.Behaviors"
xmlns:Core="using:Microsoft.Xaml.Interactions.Core"
xmlns:Interactivity="using:Microsoft.Xaml.Interactivity"
xmlns:controls="using:Template10.Controls"
xmlns:validate="using:Template10.Controls.Validation"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="using:ValidationSample.Views"
xmlns:m="using:ValidationSample.Models"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:vm="using:ValidationSample.ViewModels" mc:Ignorable="d">
<Page.DataContext>
<vm:MainPageViewModel x:Name="ViewModel" />
</Page.DataContext>
<RelativePanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="AdaptiveVisualStateGroup">
<VisualState x:Name="VisualStateNarrow">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="{StaticResource NarrowMinWidth}" />
</VisualState.StateTriggers>
<VisualState.Setters>
<!-- TODO: change properties for narrow view -->
<!--<Setter Target="stateTextBox.Text" Value="Narrow Visual State" />-->
</VisualState.Setters>
</VisualState>
<VisualState x:Name="VisualStateNormal">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="{StaticResource NormalMinWidth}" />
</VisualState.StateTriggers>
<VisualState.Setters>
<!-- TODO: change properties for normal view -->
<!--<Setter Target="stateTextBox.Text" Value="Normal Visual State" />-->
</VisualState.Setters>
</VisualState>
<VisualState x:Name="VisualStateWide">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="{StaticResource WideMinWidth}" />
</VisualState.StateTriggers>
<VisualState.Setters>
<!-- TODO: change properties for wide view -->
<!--<Setter Target="stateTextBox.Text" Value="Wide Visual State" />-->
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<controls:PageHeader x:Name="pageHeader" RelativePanel.AlignLeftWithPanel="True"
RelativePanel.AlignRightWithPanel="True"
RelativePanel.AlignTopWithPanel="True" Text="Main Page">
<!-- secondary commands -->
<controls:PageHeader.SecondaryCommands>
<AppBarButton Click="{x:Bind ViewModel.GotoSettings}" Label="Settings" />
<AppBarButton Click="{x:Bind ViewModel.GotoPrivacy}" Label="Privacy" />
<AppBarButton Click="{x:Bind ViewModel.GotoAbout}" Label="About" />
</controls:PageHeader.SecondaryCommands>
</controls:PageHeader>
<validate:ControlWrapper PropertyName="FirstName"
RelativePanel.AlignLeftWithPanel="True"
RelativePanel.Below="pageHeader">
<TextBox Width="300"
Margin="12,0,0,0"
Header="First Name"
Text="{Binding FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
</validate:ControlWrapper>
</RelativePanel>
据我所知，我有一个带有ValidatableModelBase逻辑Applied的模型，我确实将Validate：wrapper应用于视图，我在VM ctor上设置了验证器，或者我可以在模型ctor处设置它
我的问题是我在哪里制作调用逻辑??? 因为我无法触发我的FirstName字段的UpdateSourceTrigger。
我做错了什么？
更诚实的是，我不知道在何处放置Validate方法，因为在github的示例中，每次打开模态对话框窗口时都会调用validate方法，但这是每次导航到该窗口及其字段时他们改变了他们正在被验证，但在我的情况下没有任何反应，为什么？希望有人可以帮助我，因为我是模板10和UWP的新人。
答案 0 :(得分：1)
我觉得这样做了这个问题。