Xamarin Forms 프레임 워크를 사용하여 모바일 응용 프로그램을 개발 중입니다 (지금은 Android 만 타겟팅). 우리는 MVVMLight 툴킷을 사용하여 MVVM 패턴을 활용하는 애플리케이션을 구성했습니다. 데이터 관리를 위해 BreezeSharp를 사용하고 있습니다 (이미 웹 클라이언트 용 Breeze 친숙한 서버가 구현되어 있으므로).Xamarin Forms Entry와 BreezeSharp 엔터티 속성 바인딩
우리가 다루고있는 문제는 Breeze 엔터티의 속성에 바인딩 된 Xamarin Forms Entry 컨트롤을 입력 할 때의 응용 프로그램 충돌입니다. XAML 뷰
입력 제어 :
<Entry Text="{Binding SelectedCustomerAddress.AddressLine1}" />
는 뷰 모델 (집합() MVVMLight ViewModelBase 내지) 부동산 : 브리즈 CLR 타입
public CustomerAddress SelectedCustomerAddress
{
get { return this.selectedCustomerAddress; }
set { this.Set(() => this.SelectedCustomerAddress, ref this.selectedCustomerAddress, value);}
}
특성 :
public string AddressLine1
{
get { return this.GetValue<string>(); }
set { this.SetValue(value); }
}
입력 필드에 몇 개의 문자 만 입력하면 응용 프로그램이 스택 추적과 충돌합니다 :
11-10 11:51:02.896 F/ (4924): * Assertion at /Users/builder/data/lanes/monodroid-mlion-monodroid-4.18-series/3b7ef0a7/source/mono/mono/metadata/sgen-stw.c:68, condition `info->stack_start >= info->stack_start_limit && info->stack_start < info->stack_end' not met
11-10 11:51:02.900 E/mono-rt (4924): Stacktrace:
11-10 11:51:02.900 E/mono-rt (4924):
11-10 11:51:02.904 E/mono-rt (4924): at <unknown> <0xffffffff>
11-10 11:51:02.908 E/mono-rt (4924): at (wrapper managed-to-native) object.MemberwiseClone (object) <IL 0x0002d, 0xffffffff>
11-10 11:51:02.912 E/mono-rt (4924): at System.Delegate.Clone() <IL 0x00001, 0x00027>
11-10 11:51:02.916 E/mono-rt (4924): at System.MulticastDelegate.CombineImpl (System.Delegate) <IL 0x000be, 0x0037c>
11-10 11:51:02.916 E/mono-rt (4924): at System.Delegate.Combine (System.Delegate,System.Delegate) <IL 0x00062, 0x001f8>
11-10 11:51:02.920 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.add_EntityPropertyChanged (System.ComponentModel.PropertyChangedEventHandler) <IL 0x0000b, 0x00057>
11-10 11:51:02.924 E/mono-rt (4924): at Breeze.Sharp.BaseEntity.System.ComponentModel.INotifyPropertyChanged.add_PropertyChanged (System.ComponentModel.PropertyChangedEventHandler) [0x00000] in c:\GitHub\breeze.sharp\Breeze.Sharp\BaseEntity.cs:74
11-10 11:51:02.928 E/mono-rt (4924): at Xamarin.Forms.BindingExpression.ApplyCore (object,Xamarin.Forms.BindableObject,Xamarin.Forms.BindableProperty,bool) <IL 0x00130, 0x0077f>
11-10 11:51:02.928 E/mono-rt (4924): at Xamarin.Forms.BindingExpression.Apply (bool) <IL 0x00041, 0x000f3>
11-10 11:51:02.932 E/mono-rt (4924): at Xamarin.Forms.BindingExpression/BindingExpressionPart.<PropertyChanged>b__12() <IL 0x00007, 0x0002f>
11-10 11:51:02.932 E/mono-rt (4924): at Java.Lang.Thread/RunnableImplementor.Run() [0x0000b] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.18-series/3b7ef0a7/source/monodroid/src/Mono.Android/src/Java.Lang/Thread.cs:36
11-10 11:51:02.932 E/mono-rt (4924): at Java.Lang.IRunnableInvoker.n_Run (intptr,intptr) [0x00009] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.18-series/3b7ef0a7/source/monodroid/src/Mono.Android/platforms/android-18/src/generated/Java.Lang.IRunnable.cs:71
11-10 11:51:02.932 E/mono-rt (4924): at (wrapper dynamic-method) object.39beb2b5-65b4-431f-a21a-3e626049fa1f (intptr,intptr) <IL 0x00011, 0x0001b>
11-10 11:51:02.932 E/mono-rt (4924): at (wrapper native-to-managed) object.39beb2b5-65b4-431f-a21a-3e626049fa1f (intptr,intptr) <IL 0x00022, 0xffffffff>
11-10 11:51:02.936 E/mono-rt (4924): at <unknown> <0xffffffff>
11-10 11:51:02.936 E/mono-rt (4924): at (wrapper managed-to-native) object.wrapper_native_0xb60a0eb0 (intptr,intptr,intptr,Android.Runtime.JValue[]) <IL 0x00120, 0xffffffff>
11-10 11:51:02.936 E/mono-rt (4924): at Android.Runtime.JNIEnv.CallVoidMethod (intptr,intptr,Android.Runtime.JValue[]) [0x00040] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.18-series/3b7ef0a7/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:504
11-10 11:51:02.940 E/mono-rt (4924): at Android.App.Activity.RunOnUiThread (Java.Lang.IRunnable) [0x0002d] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.18-series/3b7ef0a7/source/monodroid/src/Mono.Android/platforms/android-18/src/generated/Android.App.Activity.cs:4130
11-10 11:51:02.940 E/mono-rt (4924): at Android.App.Activity.RunOnUiThread (System.Action) [0x00000] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.18-series/3b7ef0a7/source/monodroid/src/Mono.Android/src/Android.App/Activity.cs:23
11-10 11:51:02.940 E/mono-rt (4924): at Xamarin.Forms.Forms/AndroidPlatformServices.BeginInvokeOnMainThread (System.Action) <IL 0x0000b, 0x00053>
11-10 11:51:02.940 E/mono-rt (4924): at Xamarin.Forms.Device.BeginInvokeOnMainThread (System.Action) <IL 0x00006, 0x00038>
11-10 11:51:02.940 E/mono-rt (4924): at Xamarin.Forms.BindingExpression/BindingExpressionPart.PropertyChanged (object,System.ComponentModel.PropertyChangedEventArgs) <IL 0x00087, 0x00313>
11-10 11:51:02.944 E/mono-rt (4924): at (wrapper delegate-invoke) <Module>.invoke_void_object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs) <IL 0x00027, 0x00042>
11-10 11:51:02.944 E/mono-rt (4924): at (wrapper delegate-invoke) <Module>.invoke_void_object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs) <IL 0x00027, 0x00042>
11-10 11:51:02.944 E/mono-rt (4924): at (wrapper delegate-invoke) <Module>.invoke_void_object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs) <IL 0x00027, 0x00042>
..... (2500 lines)
11-10 11:51:03.564 E/mono-rt (4924): at (wrapper delegate-invoke) <Module>.invoke_void_object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs) <IL 0x00059, 0xffffffff>
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.OnPropertyChangedCore (System.ComponentModel.PropertyChangedEventArgs) [0x0000b] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:1315
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect/<>c__DisplayClass4b.<OnPropertyChanged>b__4a() [0x00000] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:1306
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.QueueEvent (System.Action) [0x0003e] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:1362
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.OnPropertyChanged (System.ComponentModel.PropertyChangedEventArgs) [0x0003f] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:1305
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.SetValueWithEvents<T> (T,object,System.Action`3<T, object, object>) [0x00042] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:563
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.SetDpValue (Breeze.Sharp.DataProperty,object) [0x00000] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:529
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.SetValue (Breeze.Sharp.StructuralProperty,object) [0x00052] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:522
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.EntityAspect.SetValue (string,object) [0x00031] in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityAspect.cs:507
11-10 11:51:03.564 E/mono-rt (4924): at Breeze.Sharp.BaseEntity.SetValue (object,string) [0x00000] in c:\GitHub\breeze.sharp\Breeze.Sharp\BaseEntity.cs:37
11-10 11:51:03.564 E/mono-rt (4924): at Client.Common.Model.Proxy.CustomerAddress.set_AddressLine2 (string) [0x00001] in c:\Projects\Client\source\Client.Common\Model\Proxy\CustomerAddress.cs:26
11-10 11:51:03.564 E/mono-rt (4924): at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <IL 0x00052, 0xffffffff>
11-10 11:51:03.564 E/mono-rt (4924): at <unknown> <0xffffffff>
11-10 11:51:03.564 E/mono-rt (4924): at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) <IL 0x00030, 0xffffffff>
11-10 11:51:03.564 E/mono-rt (4924): at System.Reflection.MonoMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <IL 0x0004a, 0x0016f>
11-10 11:51:03.564 E/mono-rt (4924): at System.Reflection.MethodBase.Invoke (object,object[]) <IL 0x00006, 0x0004b>
11-10 11:51:03.564 E/mono-rt (4924): at Xamarin.Forms.BindingExpression.ApplyCore (object,Xamarin.Forms.BindableObject,Xamarin.Forms.BindableProperty,bool) <IL 0x002f4, 0x00fd3>
11-10 11:51:03.564 E/mono-rt (4924): at Xamarin.Forms.BindingExpression.Apply (bool) <IL 0x00041, 0x000f3>
11-10 11:51:03.564 E/mono-rt (4924): at Xamarin.Forms.Binding.Apply (bool) <IL 0x00027, 0x000db>
11-10 11:51:03.564 E/mono-rt (4924): at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty,object,bool,bool,bool) <IL 0x00090, 0x00295>
11-10 11:51:03.564 E/mono-rt (4924): at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty,object,bool,bool,bool) <IL 0x00213, 0x007b7>
11-10 11:51:03.564 E/mono-rt (4924): at Xamarin.Forms.Platform.Android.EntryRenderer.Android.Text.ITextWatcher.OnTextChanged (Java.Lang.ICharSequence,int,int,int) <IL 0x00014, 0x00087>
11-10 11:51:03.564 E/mono-rt (4924): at Android.Text.ITextWatcherInvoker.n_OnTextChanged_Ljava_lang_CharSequence_III (intptr,intptr,intptr,int,int,int) [0x00011] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.18-series/3b7ef0a7/source/monodroid/src/Mono.Android/platforms/android-18/src/generated/Android.Text.ITextWatcher.cs:149
11-10 11:51:03.564 E/mono-rt (4924): at (wrapper dynamic-method) object.369fe85e-8bc0-4aec-88da-b1540ec93f9c (intptr,intptr,intptr,int,int,int) <IL 0x00029, 0x0003f>
11-10 11:51:03.564 E/mono-rt (4924): at (wrapper native-to-managed) object.369fe85e-8bc0-4aec-88da-b1540ec93f9c (intptr,intptr,intptr,int,int,int) <IL 0x00028, 0xffffffff>
11-10 11:51:03.564 E/mono-rt (4924):
11-10 11:51:03.564 E/mono-rt (4924): =================================================================
11-10 11:51:03.564 E/mono-rt (4924): Got a SIGSEGV while executing native code. This usually indicates
11-10 11:51:03.564 E/mono-rt (4924): a fatal error in the mono runtime or one of the native libraries
11-10 11:51:03.564 E/mono-rt (4924): used by your application.
11-10 11:51:03.564 E/mono-rt (4924): =================================================================
11-10 11:51:03.564 E/mono-rt (4924):
11-10 11:51:03.564 F/libc (4924): Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 4924 (r.nimbus.mobile)
The program 'Mono' has exited with code 0 (0x0).
많은 이벤트가 발생하여 이벤트 스택 오버플로가 발생합니다.
Breeze 이외의 속성에 바인딩 할 때 항목이 올바르게 작동합니다. 분리 된 엔티티에 바인드 될 때도 잘 작동합니다.
브리즈 EntityAspect.cs 코드로 파고 후 나는 모든이 함수에 오는 것을 발견
internal void OnPropertyChanged(PropertyChangedEventArgs pcArgs)
{
if (this.IsDetached || !this.EntityGroup.ChangeNotificationEnabled)
return;
pcArgs = pcArgs ?? EntityAspect.AllPropertiesChangedEventArgs;
this.QueueEvent((Action) (() =>
{
this.OnPropertyChangedCore(pcArgs);
this.OnEntityChangedCore(EntityAction.PropertyChange, (EventArgs) pcArgs);
}));
}
그래서 바람에 나는 장애인 모금 이벤트 사용 :
this.EntityManager.ChangeNotificationEnabled = false;
나타나는이 해결할 수있는 문제가 우리의 입장 구속력 문제. 그러나 다른 문제에 대한 문호가 열리는 지 확신 할 수 없습니다.
이 접근의 결과는 무엇입니까?
Breeze 코드에서 사용되는 이러한 EntityPropertyChanged 및 PropertyChanged 이벤트는 해당 코드를 첨부하기 위해서만 사용합니까?
또는이 문제에 대한 다른 접근 방법이 있습니까?
UPDATE : 우리가 같은 속성에 바인딩 UI에 둘 이상의 요소가있는 경우에 우리가 한 장소에 해당 속성을 업데이트 할 경우, 변화가 다른 장소에 표시되지 않습니다 : 처벌이다.
예제 : ListView에서 요소를 선택하고 선택한 요소를 일부 입력 필드 (ListView 외부)에 바인딩합니다. 해당 입력 필드를 통해 요소를 업데이트 할 때 변경 사항은 ListView에 표시되지 않습니다 (ListView에 알림이 전달되지 않음).
Breeze PropertyChanged 메커니즘 (EntityPropertyChanged 및 ForceEntityPropertyChanged)을 사용하면이 기능이 기본적으로 작동하지만 위에서 언급 한 것처럼 응용 프로그램이 손상 될 수 있습니다.
우리는 기본 엔터티 (Breeze BaseEntity에서 상속받은 엔터티)에서 OnPropertyChanged 및 RaisePropertyChanged 메서드를 구현했습니다.이 기법은 ObservableObject의 MVVMLight 구현과 유사합니다.
이 코드는 (응용 프로그램 충돌없이) 잘 작동: 나는 추측하고있어
this.SelectedNote.RaisePropertyChanged("IsImportant");
Xamarin forms [Entry] (http://androidapi.xamarin.com/?link=T%3aXamarin.Forms.Entry%2f*)/[편집자] (http://androidapi.xamarin.com/?link) = T % 3aXamarin.Forms.Entry % 2f *) have 텍스트를 입력 한 후 (또는 요소의 초점을 맞출 때 더 정확하게) 시작된 이벤트를 완료했습니다. 이 접근법의 문제점은 양방향 바인딩을 사용하는 대신 코드 뒤에 각 입력 필드에 대한 이벤트 처리기를 작성해야한다는 것입니다. – markolazic88