ReactiveUI 验证不会引发错误通知并且无法绑定验证
ReactiveUI Validation Does not raise Error Notification And Failed To BindValidation
您好，
我尝试使用 ReactiveUI.Validation package
验证 Wpf 简单应用程序
并且验证工作 i can see it in ViewModel valid state
但是我看不到任何查看元素的通知
我的意思是没有红色边框或任何类型的错误出现，即使使用 MaterialDesignPackage、Custome 模板 nothing works!
ViewModel.cs
public class AddNewUserViewModel : ReactiveValidationObject<AddNewUserViewModel>
{
private string _email;
public string Email
{
get => _email;
set => this.RaiseAndSetIfChanged(ref _email, value);
}
public ReactiveCommand<Unit,Unit> Start { get; }
public AddNewUserViewModel()
{
var vEmailHelper = this
.ValidationRule(viewModel => viewModel.Email, e => e?.Length > 2, "Error Email Message");
var canStart = this.IsValid();
Start = ReactiveCommand.Create(() => { }, canStart);
}
}
View.cs
public partial class AddNewUserDialogView : ReactiveWindow<AddNewUserViewModel>
{
public AddNewUserDialogView()
{
ViewModel = new AddNewUserViewModel();
InitializeComponent();
this.WhenActivated(disposable =>
{
this.Bind(ViewModel, viewModel => viewModel.Email, v => v.EmailTextBox.Text)
.DisposeWith(disposable);
this.BindCommand(ViewModel, viewModel => viewModel.Start, v => v.ButStart).DisposeWith(disposable);
});
}
}
View.cs.xaml
<reactiveUi:ReactiveWindow x:TypeArguments="dialogs:AddNewUserViewModel"
x:Class="UsersManager.UI.Views.Body.Dialogs.AddNewUserDialogView"
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:UsersManager.UI.Views.Body.Dialogs"
xmlns:reactiveUi="http://reactiveui.net"
xmlns:dialogs="clr-namespace:UsersManager.Backend.ViewModels.Body.Dialogs;assembly=UsersManager.Backend"
mc:Ignorable="d"
Title="test" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="2*"/>
<RowDefinition Height="2*"/>
<RowDefinition Height="10*"/>
</Grid.RowDefinitions>
<TextBox
Grid.Row="0"
x:Name="EmailTextBox"
materialDesign:HintAssist.Hint="Name"
materialDesign:HintAssist.HelperText="Your user name"
>
</TextBox>
<Button
Grid.Row="1"
x:Name="ButStart"
>Start</Button>
</Grid>
</reactiveUi:ReactiveWindow>
如果我的 EmailText 不符合规则，按钮被禁用，这没问题
但是我在 TextBox 控件本身中看不到任何验证行为？
I try it with ErrorTemplate but not work also
那么我怎样才能显示错误甚至在视图中获得任何错误通知
另请注意：May open it as new question
当我尝试绑定特定 属性 的验证消息时，它失败了
public partial class AddNewUserDialogView : ReactiveWindow<AddNewUserViewModel>
{
public AddNewUserDialogView()
{
ViewModel = new AddNewUserViewModel();
InitializeComponent();
this.WhenActivated(disposable =>
{
this.Bind(ViewModel, viewModel => viewModel.Email, v => v.EmailTextBox.Text)
.DisposeWith(disposable);
this.BindCommand(ViewModel, viewModel => viewModel.Start, v => v.ButStart).DisposeWith(disposable);
// here
this.BindValidation(ViewModel, viewModel => viewModel.Email, v => v.ButStart.Content).DisposeWith(disposable);
});
}
}
错误：
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
这个错误出现在ReactiveUI的CurrentThreadScheduler.cs
在行 107
这是代码段错误位置
// Line 85
SchedulerQueue<TimeSpan> queue;
// There is no timed task and no task is currently running
if (!_running)
{
_running = true;
if (dueTime > TimeSpan.Zero)
{
ConcurrencyAbstractionLayer.Current.Sleep(dueTime);
}
// execute directly without queueing
IDisposable d;
try
{
d = action(this, state);
}
catch
{
SetQueue(null);
_running = false;
throw; // Line 107
}
但是
当我尝试绑定 Total/Ultimate ViewModel 错误消息时，它起作用了！
public partial class AddNewUserDialogView : ReactiveWindow<AddNewUserViewModel>
{
public AddNewUserDialogView()
{
ViewModel = new AddNewUserViewModel();
InitializeComponent();
this.WhenActivated(disposable =>
{
this.Bind(ViewModel, viewModel => viewModel.Email, v => v.EmailTextBox.Text)
.DisposeWith(disposable);
this.BindCommand(ViewModel, viewModel => viewModel.Start, v => v.ButStart).DisposeWith(disposable);
// here
this.BindValidation(ViewModel, v => v.ButStart.Content).DisposeWith(disposable);
});
}
}
资源：我认为可能有用
https://github.com/reactiveui/ReactiveUI.Validation/issues/16
https://github.com/reactiveui/ReactiveUI.Validation/pull/17
https://github.com/reactiveui/ReactiveUI.Validation/pull/44
套餐
<ItemGroup>
<Reference Include="ActiproSoftware.BarCode.Wpf, Version=17.2.663.0, Culture=neutral, PublicKeyToken=36ff2196ab5654b9, processorArchitecture=MSIL" />
<Reference Include="ActiproSoftware.Shared.Wpf, Version=17.2.663.0, Culture=neutral, PublicKeyToken=36ff2196ab5654b9, processorArchitecture=MSIL" />
<Reference Include="DynamicData, Version=6.14.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\DynamicData.6.14.8\lib\net461\DynamicData.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ICSharpCode.AvalonEdit, Version=5.0.3.0, Culture=neutral, PublicKeyToken=9cc39be672370310, processorArchitecture=MSIL">
<HintPath>..\packages\AvalonEdit.5.0.4\lib\Net40\ICSharpCode.AvalonEdit.dll</HintPath>
</Reference>
<Reference Include="MaterialDesignColors, Version=1.2.2.920, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\MaterialDesignColors.1.2.2\lib\net45\MaterialDesignColors.dll</HintPath>
</Reference>
<Reference Include="MaterialDesignThemes.Wpf, Version=3.0.1.920, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\MaterialDesignThemes.3.0.1\lib\net45\MaterialDesignThemes.Wpf.dll</HintPath>
</Reference>
<Reference Include="mscorlib" />
<Reference Include="Pharmacist.Common, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\Pharmacist.Common.1.5.15\lib\netstandard2.0\Pharmacist.Common.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="PresentationFramework.Aero" />
<Reference Include="ReactiveUI, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.11.2.3\lib\net461\ReactiveUI.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ReactiveUI.Events.WPF, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.Events.WPF.11.2.3\lib\net461\ReactiveUI.Events.WPF.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ReactiveUI.Fody.Helpers, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.Fody.11.2.3\lib\net461\ReactiveUI.Fody.Helpers.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ReactiveUI.Validation, Version=1.4.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\ReactiveUI.Validation.1.4.10\lib\net461\ReactiveUI.Validation.dll</HintPath>
</Reference>
<Reference Include="ReactiveUI.WPF, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.WPF.11.2.3\lib\net461\ReactiveUI.WPF.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ShowMeTheXAML, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\ShowMeTheXAML.1.0.12\lib\net45\ShowMeTheXAML.dll</HintPath>
</Reference>
<Reference Include="ShowMeTheXAML.AvalonEdit, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\ShowMeTheXAML.AvalonEdit.1.0.12\lib\net45\ShowMeTheXAML.AvalonEdit.dll</HintPath>
</Reference>
<Reference Include="Splat, Version=9.3.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\Splat.9.3.11\lib\net461\Splat.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Data" />
<Reference Include="System.Reactive, Version=4.3.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263">
<HintPath>..\packages\System.Reactive.4.3.2\lib\net46\System.Reactive.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
<HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.4.5.2\lib\netstandard2.0\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
<HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.3\lib\netstandard2.0\System.Threading.Tasks.Extensions.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
<HintPath>..\packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Windows" />
<Reference Include="System.Windows.Forms" />
<Reference Include="System.Xml" />
<Reference Include="System.Xaml">
<RequiredTargetFramework>4.0</RequiredTargetFramework>
</Reference>
<Reference Include="WindowsBase" />
<Reference Include="PresentationCore" />
<Reference Include="PresentationFramework" />
</ItemGroup>
更新
我用很奇怪的修改解决了第二个问题
这不能被视为真正的解决方案
我只听验证状态变化
在视图中
ViewModel.ValidationContext.ValidationStatusChange.Subscribe(x =>
{
// if i omite next line , the solution will not work
MessageBox.Show("Start");
});
现在出现验证消息
// so: now this line will not produce argument out of range exception
this.BindValidation(ViewModel, viewModel => viewModel.Email, v => v.ButStart.Content).DisposeWith(disposable);
另请注意：如果我直接从 viewModel 收听，解决方案也将有效
I tested it in another project
但这里我把它分开了，因为我使用了与UI/Backendcontains ViewModels
不同的项目
另请注意，如果我听任何其他验证器，这将起作用
因此，如果我将电子邮件 ValidationHelper 作为 属性 从 ViewModel 公开并订阅它，这将起作用，
此外，如果我只是 subscribe/listen 从 ViewModel 向 ValidationHelper 发送电子邮件，这也可以工作
但是请记住，我仍然需要调用 MessageBox.Show("")
注意：如果我在任何 Window 甚至 MainWindow
上调用 ShowDialog()，这将起作用
所以下一个解决方案也可以工作
ViewModel.ValidationContext.ValidationStatusChange.Subscribe(x =>
{
var v = new MainWindow();
v.ShowDialog();
});
当前不支持将验证绑定到控件模板，但如果将其绑定到单独的文本块 (Documentation)，则可以在视图中显示验证错误消息。
如果您只想使用 MaterialDesign HelperText 显示错误消息，则不需要使用 ReactiveUI.Validation，但可以这样做：
// Viewmodel
private ObservableAsPropertyHelper<bool> isEmailValid;
public bool IsEmailValid => isEmailValid.Value;
...
isEmailValid = this.WhenAnyValue(x => x.Email).Select(e => e?.Length > 2).ToProperty(this, nameof(IsEmailValid));
// View
this.WhenAnyValue(x => x.ViewModel.IsEmailValid)
.Do(isValid => HintAssist.SetHint(EmailTextBox, isValid ? string.Empty : "Error Email Message"))
.Subscribe();
当您使用最新版本的 ReactiveUI.Validation (1.4.13) 时，您的第二个问题应该会得到解决。
您好，
我尝试使用 ReactiveUI.Validation package
验证 Wpf 简单应用程序
并且验证工作 i can see it in ViewModel valid state
但是我看不到任何查看元素的通知
我的意思是没有红色边框或任何类型的错误出现，即使使用 MaterialDesignPackage、Custome 模板 nothing works!
ViewModel.cs
public class AddNewUserViewModel : ReactiveValidationObject<AddNewUserViewModel>
{
private string _email;
public string Email
{
get => _email;
set => this.RaiseAndSetIfChanged(ref _email, value);
}
public ReactiveCommand<Unit,Unit> Start { get; }
public AddNewUserViewModel()
{
var vEmailHelper = this
.ValidationRule(viewModel => viewModel.Email, e => e?.Length > 2, "Error Email Message");
var canStart = this.IsValid();
Start = ReactiveCommand.Create(() => { }, canStart);
}
}
View.cs
public partial class AddNewUserDialogView : ReactiveWindow<AddNewUserViewModel>
{
public AddNewUserDialogView()
{
ViewModel = new AddNewUserViewModel();
InitializeComponent();
this.WhenActivated(disposable =>
{
this.Bind(ViewModel, viewModel => viewModel.Email, v => v.EmailTextBox.Text)
.DisposeWith(disposable);
this.BindCommand(ViewModel, viewModel => viewModel.Start, v => v.ButStart).DisposeWith(disposable);
});
}
}
View.cs.xaml
<reactiveUi:ReactiveWindow x:TypeArguments="dialogs:AddNewUserViewModel"
x:Class="UsersManager.UI.Views.Body.Dialogs.AddNewUserDialogView"
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:UsersManager.UI.Views.Body.Dialogs"
xmlns:reactiveUi="http://reactiveui.net"
xmlns:dialogs="clr-namespace:UsersManager.Backend.ViewModels.Body.Dialogs;assembly=UsersManager.Backend"
mc:Ignorable="d"
Title="test" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="2*"/>
<RowDefinition Height="2*"/>
<RowDefinition Height="10*"/>
</Grid.RowDefinitions>
<TextBox
Grid.Row="0"
x:Name="EmailTextBox"
materialDesign:HintAssist.Hint="Name"
materialDesign:HintAssist.HelperText="Your user name"
>
</TextBox>
<Button
Grid.Row="1"
x:Name="ButStart"
>Start</Button>
</Grid>
</reactiveUi:ReactiveWindow>
如果我的 EmailText 不符合规则，按钮被禁用，这没问题
但是我在 TextBox 控件本身中看不到任何验证行为？
I try it with ErrorTemplate but not work also
那么我怎样才能显示错误甚至在视图中获得任何错误通知
另请注意：May open it as new question
当我尝试绑定特定 属性 的验证消息时，它失败了
public partial class AddNewUserDialogView : ReactiveWindow<AddNewUserViewModel>
{
public AddNewUserDialogView()
{
ViewModel = new AddNewUserViewModel();
InitializeComponent();
this.WhenActivated(disposable =>
{
this.Bind(ViewModel, viewModel => viewModel.Email, v => v.EmailTextBox.Text)
.DisposeWith(disposable);
this.BindCommand(ViewModel, viewModel => viewModel.Start, v => v.ButStart).DisposeWith(disposable);
// here
this.BindValidation(ViewModel, viewModel => viewModel.Email, v => v.ButStart.Content).DisposeWith(disposable);
});
}
}
错误：
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
这个错误出现在ReactiveUI的CurrentThreadScheduler.cs
在行 107
这是代码段错误位置
// Line 85
SchedulerQueue<TimeSpan> queue;
// There is no timed task and no task is currently running
if (!_running)
{
_running = true;
if (dueTime > TimeSpan.Zero)
{
ConcurrencyAbstractionLayer.Current.Sleep(dueTime);
}
// execute directly without queueing
IDisposable d;
try
{
d = action(this, state);
}
catch
{
SetQueue(null);
_running = false;
throw; // Line 107
}
但是
当我尝试绑定 Total/Ultimate ViewModel 错误消息时，它起作用了！
public partial class AddNewUserDialogView : ReactiveWindow<AddNewUserViewModel>
{
public AddNewUserDialogView()
{
ViewModel = new AddNewUserViewModel();
InitializeComponent();
this.WhenActivated(disposable =>
{
this.Bind(ViewModel, viewModel => viewModel.Email, v => v.EmailTextBox.Text)
.DisposeWith(disposable);
this.BindCommand(ViewModel, viewModel => viewModel.Start, v => v.ButStart).DisposeWith(disposable);
// here
this.BindValidation(ViewModel, v => v.ButStart.Content).DisposeWith(disposable);
});
}
}
https://github.com/reactiveui/ReactiveUI.Validation/issues/16
https://github.com/reactiveui/ReactiveUI.Validation/pull/17
https://github.com/reactiveui/ReactiveUI.Validation/pull/44
套餐
<ItemGroup>
<Reference Include="ActiproSoftware.BarCode.Wpf, Version=17.2.663.0, Culture=neutral, PublicKeyToken=36ff2196ab5654b9, processorArchitecture=MSIL" />
<Reference Include="ActiproSoftware.Shared.Wpf, Version=17.2.663.0, Culture=neutral, PublicKeyToken=36ff2196ab5654b9, processorArchitecture=MSIL" />
<Reference Include="DynamicData, Version=6.14.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\DynamicData.6.14.8\lib\net461\DynamicData.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ICSharpCode.AvalonEdit, Version=5.0.3.0, Culture=neutral, PublicKeyToken=9cc39be672370310, processorArchitecture=MSIL">
<HintPath>..\packages\AvalonEdit.5.0.4\lib\Net40\ICSharpCode.AvalonEdit.dll</HintPath>
</Reference>
<Reference Include="MaterialDesignColors, Version=1.2.2.920, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\MaterialDesignColors.1.2.2\lib\net45\MaterialDesignColors.dll</HintPath>
</Reference>
<Reference Include="MaterialDesignThemes.Wpf, Version=3.0.1.920, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\MaterialDesignThemes.3.0.1\lib\net45\MaterialDesignThemes.Wpf.dll</HintPath>
</Reference>
<Reference Include="mscorlib" />
<Reference Include="Pharmacist.Common, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\Pharmacist.Common.1.5.15\lib\netstandard2.0\Pharmacist.Common.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="PresentationFramework.Aero" />
<Reference Include="ReactiveUI, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.11.2.3\lib\net461\ReactiveUI.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ReactiveUI.Events.WPF, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.Events.WPF.11.2.3\lib\net461\ReactiveUI.Events.WPF.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ReactiveUI.Fody.Helpers, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.Fody.11.2.3\lib\net461\ReactiveUI.Fody.Helpers.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ReactiveUI.Validation, Version=1.4.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\ReactiveUI.Validation.1.4.10\lib\net461\ReactiveUI.Validation.dll</HintPath>
</Reference>
<Reference Include="ReactiveUI.WPF, Version=11.2.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\ReactiveUI.WPF.11.2.3\lib\net461\ReactiveUI.WPF.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="ShowMeTheXAML, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\ShowMeTheXAML.1.0.12\lib\net45\ShowMeTheXAML.dll</HintPath>
</Reference>
<Reference Include="ShowMeTheXAML.AvalonEdit, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\ShowMeTheXAML.AvalonEdit.1.0.12\lib\net45\ShowMeTheXAML.AvalonEdit.dll</HintPath>
</Reference>
<Reference Include="Splat, Version=9.3.0.0, Culture=neutral, PublicKeyToken=null">
<HintPath>..\packages\Splat.9.3.11\lib\net461\Splat.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Data" />
<Reference Include="System.Reactive, Version=4.3.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263">
<HintPath>..\packages\System.Reactive.4.3.2\lib\net46\System.Reactive.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
<HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.4.5.2\lib\netstandard2.0\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
<HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.3\lib\netstandard2.0\System.Threading.Tasks.Extensions.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
<HintPath>..\packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Windows" />
<Reference Include="System.Windows.Forms" />
<Reference Include="System.Xml" />
<Reference Include="System.Xaml">
<RequiredTargetFramework>4.0</RequiredTargetFramework>
</Reference>
<Reference Include="WindowsBase" />
<Reference Include="PresentationCore" />
<Reference Include="PresentationFramework" />
</ItemGroup>
更新
我用很奇怪的修改解决了第二个问题
这不能被视为真正的解决方案
我只听验证状态变化
在视图中
ViewModel.ValidationContext.ValidationStatusChange.Subscribe(x =>
{
// if i omite next line , the solution will not work
MessageBox.Show("Start");
});
现在出现验证消息
// so: now this line will not produce argument out of range exception
this.BindValidation(ViewModel, viewModel => viewModel.Email, v => v.ButStart.Content).DisposeWith(disposable);
I tested it in another project
但这里我把它分开了，因为我使用了与UI/Backendcontains ViewModels
因此，如果我将电子邮件 ValidationHelper 作为 属性 从 ViewModel 公开并订阅它，这将起作用，
此外，如果我只是 subscribe/listen 从 ViewModel 向 ValidationHelper 发送电子邮件，这也可以工作
但是请记住，我仍然需要调用 MessageBox.Show("")
注意：如果我在任何 Window 甚至 MainWindow
上调用 ShowDialog()，这将起作用所以下一个解决方案也可以工作
ViewModel.ValidationContext.ValidationStatusChange.Subscribe(x =>
{
var v = new MainWindow();
v.ShowDialog();
});
当前不支持将验证绑定到控件模板，但如果将其绑定到单独的文本块 (Documentation)，则可以在视图中显示验证错误消息。
如果您只想使用 MaterialDesign HelperText 显示错误消息，则不需要使用 ReactiveUI.Validation，但可以这样做：
// Viewmodel
private ObservableAsPropertyHelper<bool> isEmailValid;
public bool IsEmailValid => isEmailValid.Value;
...
isEmailValid = this.WhenAnyValue(x => x.Email).Select(e => e?.Length > 2).ToProperty(this, nameof(IsEmailValid));
// View
this.WhenAnyValue(x => x.ViewModel.IsEmailValid)
.Do(isValid => HintAssist.SetHint(EmailTextBox, isValid ? string.Empty : "Error Email Message"))
.Subscribe();
当您使用最新版本的 ReactiveUI.Validation (1.4.13) 时，您的第二个问题应该会得到解决。