Xamarin 表单：未处理的异常：System.Reflection.TargetInvocationException：调用目标已抛出异常
Xamarin forms: Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation
当我在真实的 iPhone 设备上测试我的应用程序时，我遇到了异常。但同样的功能在 android 设备和 ios 模拟器上运行良好。
Unhandled Exception:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.FormatException: Input string was not in a correct format.
at System.Number.ThrowOverflowOrFormatException (System.Boolean overflow, System.String overflowResourceKey) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corert/src/System.Private.CoreLib/shared/System/Number.Parsing.cs:1781
at System.Number.ParseInt32 (System.ReadOnlySpan`1[T] value, System.Globalization.NumberStyles styles, System.Globalization.NumberFormatInfo info) [0x00016] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corert/src/System.Private.CoreLib/shared/System/Number.Parsing.cs:213
at System.Int32.Parse (System.String s) [0x0000a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Int32.cs:109
at MyProject.eventsHB.get_finalDay () [0x00060] in /Users/pagematics/Projects/MyProject-social-app/MyProject/MyProject/Model/LoginResponse.cs:76
at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:395
我已经在 this 文件中添加了完整的异常详细信息。
我的代码
ViewModel
EventAllItems.Add(eventshb); //异常在这一行触发
public Events events;
private ObservableCollection<eventsHB> _eventAllItems;
public ObservableCollection<eventsHB> EventAllItems
{
get
{
return _eventAllItems;
}
set
{
_eventAllItems = value;
OnPropertyChanged("EventAllItems");
}
}
var Response = await client.GetAsync("my rest api path");
if (Response.IsSuccessStatusCode)
{
string response = await Response.Content.ReadAsStringAsync();
events = new Events();
if (response != "")
{
events = JsonConvert.DeserializeObject<Events>(response.ToString());
foreach (var eventshb in events.eventsHB)
{
foreach(var events in eventshb.eventsList)
{
eventshb.eventsListTO = events;
EventAllItems.Add(eventshb); //The exception is triggering on this line
}
lastDateInList = eventshb.day.ToString();
}
}
}
型号Class
public class Events
{
public List<eventsHB> eventsHB { get; set; }
}
public class eventsHB
{
public long day { get; set; }
public List<EventsList> eventsList { get; set; }
public EventsList eventsListTO { get; set; }
}
public class EventsList
{
public string title { get; set; }
public string description { get; set; }
public string longDescription { get; set; }
public string startDate { get; set; }
public string endDate { get; set; }
public string startTime { get; set; }
public string endTime { get; set; }
}
示例数据：
{
"eventsHB": [
{
"day": 1627914600000,
"eventsList": [
{
"calendarEventId": 236,
"calenderId": 948154,
"title": "Business Meet",
"description": "SD July 2 ED July 5",
"longDescription": "SD July 2 ED July 5"
}
]
},
{
"day": 1628001000000,
"eventsList": [
{
"calendarEventId": 236,
"calenderId": 948154,
"title": "Business Meet",
"description": "SD July 2 ED July 5",
"longDescription": "SD July 2 ED July 5"
}
]
},
{
"day": 1628087400000,
"eventsList": [
{
"calendarEventId": 236,
"calenderId": 948154,
"title": "Business Meet",
"description": "SD July 2 ED July 5",
"longDescription": "SD July 2 ED July 5"
]
}
]
}
Xaml：我正在使用 eventsListTO 变量来显示 UI.
的详细信息
<ListView
x:Name="EventsListview"
SeparatorVisibility="None"
ItemsSource="{Binding EventAllItems, Mode=TwoWay}"
HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout
VerticalOptions="CenterAndExpand"
Margin="10,5,10,0"
Orientation="Vertical">
<Frame
VerticalOptions="CenterAndExpand"
HasShadow="False">
<StackLayout
VerticalOptions="CenterAndExpand"
Orientation="Vertical">
<Label
Text="{Binding eventsListTO.title}"
TextColor="#1C7DB4"
HorizontalOptions="Start"
VerticalOptions="Center">
<Label.FontFamily>
<OnPlatform x:TypeArguments="x:String">
<On Platform="iOS" Value="Roboto-Medium" />
<On Platform="Android" Value="Roboto-Medium.ttf#Roboto-Medium" />
<On Platform="UWP" Value="Assets/Fonts/Roboto-Medium.ttf#Roboto" />
</OnPlatform>
</Label.FontFamily>
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>17</OnIdiom.Phone>
<OnIdiom.Tablet>25</OnIdiom.Tablet>
<OnIdiom.Desktop>17</OnIdiom.Desktop>
</OnIdiom>
</Label.FontSize>
</Label>
<Label
Text="{Binding eventsListTO.description}"
TextColor="#1C7DB4"
VerticalTextAlignment="Center"
Margin="0,-3,-5,0"
HorizontalOptions="FillAndExpand"
VerticalOptions="Center">
<Label.FontFamily>
<OnPlatform x:TypeArguments="x:String">
<On Platform="iOS" Value="Roboto-Light" />
<On Platform="Android" Value="Roboto-Light.ttf#Roboto-Light" />
<On Platform="UWP" Value="Assets/Fonts/Roboto-Light.ttf#Roboto" />
</OnPlatform>
</Label.FontFamily>
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>12</OnIdiom.Phone>
<OnIdiom.Tablet>18</OnIdiom.Tablet>
<OnIdiom.Desktop>12</OnIdiom.Desktop>
</OnIdiom>
</Label.FontSize>
</Label>
</StackLayout>
</StackLayout>
</Frame>
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.Footer>
<Label/>
</ListView.Footer>
</ListView>
我在 UI 上列出了一些项目。异常仅显示在实际 iPhone 设备上。在 android 设备和 iPhone 模拟器上一切正常。
XF版本：4.8.0.1821
Mac 对比版本：8.10.2
Xcode版本：12.5.1
iPhone 版本：14.6、14.4
问题出在日期和时间值上。
日期问题：在 Android 设备和 ios 模拟器上，日期格式为 dd/mm/yyyy。但是在实际的 iPhone 设备上，日期格式是 dd-mm-yyyy.
时间问题：在 ios 模拟器上，我们得到时间的 AM 或 PM 值，但在实际 iPhone 设备上，时间是 24 小时格式，没有 AM 或 PM。
当我在真实的 iPhone 设备上测试我的应用程序时，我遇到了异常。但同样的功能在 android 设备和 ios 模拟器上运行良好。
Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.FormatException: Input string was not in a correct format. at System.Number.ThrowOverflowOrFormatException (System.Boolean overflow, System.String overflowResourceKey) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corert/src/System.Private.CoreLib/shared/System/Number.Parsing.cs:1781 at System.Number.ParseInt32 (System.ReadOnlySpan`1[T] value, System.Globalization.NumberStyles styles, System.Globalization.NumberFormatInfo info) [0x00016] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corert/src/System.Private.CoreLib/shared/System/Number.Parsing.cs:213 at System.Int32.Parse (System.String s) [0x0000a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Int32.cs:109 at MyProject.eventsHB.get_finalDay () [0x00060] in /Users/pagematics/Projects/MyProject-social-app/MyProject/MyProject/Model/LoginResponse.cs:76 at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:395
我已经在 this 文件中添加了完整的异常详细信息。
我的代码
ViewModel
EventAllItems.Add(eventshb); //异常在这一行触发
public Events events;
private ObservableCollection<eventsHB> _eventAllItems;
public ObservableCollection<eventsHB> EventAllItems
{
get
{
return _eventAllItems;
}
set
{
_eventAllItems = value;
OnPropertyChanged("EventAllItems");
}
}
var Response = await client.GetAsync("my rest api path");
if (Response.IsSuccessStatusCode)
{
string response = await Response.Content.ReadAsStringAsync();
events = new Events();
if (response != "")
{
events = JsonConvert.DeserializeObject<Events>(response.ToString());
foreach (var eventshb in events.eventsHB)
{
foreach(var events in eventshb.eventsList)
{
eventshb.eventsListTO = events;
EventAllItems.Add(eventshb); //The exception is triggering on this line
}
lastDateInList = eventshb.day.ToString();
}
}
}
型号Class
public class Events
{
public List<eventsHB> eventsHB { get; set; }
}
public class eventsHB
{
public long day { get; set; }
public List<EventsList> eventsList { get; set; }
public EventsList eventsListTO { get; set; }
}
public class EventsList
{
public string title { get; set; }
public string description { get; set; }
public string longDescription { get; set; }
public string startDate { get; set; }
public string endDate { get; set; }
public string startTime { get; set; }
public string endTime { get; set; }
}
示例数据：
{
"eventsHB": [
{
"day": 1627914600000,
"eventsList": [
{
"calendarEventId": 236,
"calenderId": 948154,
"title": "Business Meet",
"description": "SD July 2 ED July 5",
"longDescription": "SD July 2 ED July 5"
}
]
},
{
"day": 1628001000000,
"eventsList": [
{
"calendarEventId": 236,
"calenderId": 948154,
"title": "Business Meet",
"description": "SD July 2 ED July 5",
"longDescription": "SD July 2 ED July 5"
}
]
},
{
"day": 1628087400000,
"eventsList": [
{
"calendarEventId": 236,
"calenderId": 948154,
"title": "Business Meet",
"description": "SD July 2 ED July 5",
"longDescription": "SD July 2 ED July 5"
]
}
]
}
Xaml：我正在使用 eventsListTO 变量来显示 UI.
<ListView
x:Name="EventsListview"
SeparatorVisibility="None"
ItemsSource="{Binding EventAllItems, Mode=TwoWay}"
HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout
VerticalOptions="CenterAndExpand"
Margin="10,5,10,0"
Orientation="Vertical">
<Frame
VerticalOptions="CenterAndExpand"
HasShadow="False">
<StackLayout
VerticalOptions="CenterAndExpand"
Orientation="Vertical">
<Label
Text="{Binding eventsListTO.title}"
TextColor="#1C7DB4"
HorizontalOptions="Start"
VerticalOptions="Center">
<Label.FontFamily>
<OnPlatform x:TypeArguments="x:String">
<On Platform="iOS" Value="Roboto-Medium" />
<On Platform="Android" Value="Roboto-Medium.ttf#Roboto-Medium" />
<On Platform="UWP" Value="Assets/Fonts/Roboto-Medium.ttf#Roboto" />
</OnPlatform>
</Label.FontFamily>
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>17</OnIdiom.Phone>
<OnIdiom.Tablet>25</OnIdiom.Tablet>
<OnIdiom.Desktop>17</OnIdiom.Desktop>
</OnIdiom>
</Label.FontSize>
</Label>
<Label
Text="{Binding eventsListTO.description}"
TextColor="#1C7DB4"
VerticalTextAlignment="Center"
Margin="0,-3,-5,0"
HorizontalOptions="FillAndExpand"
VerticalOptions="Center">
<Label.FontFamily>
<OnPlatform x:TypeArguments="x:String">
<On Platform="iOS" Value="Roboto-Light" />
<On Platform="Android" Value="Roboto-Light.ttf#Roboto-Light" />
<On Platform="UWP" Value="Assets/Fonts/Roboto-Light.ttf#Roboto" />
</OnPlatform>
</Label.FontFamily>
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>12</OnIdiom.Phone>
<OnIdiom.Tablet>18</OnIdiom.Tablet>
<OnIdiom.Desktop>12</OnIdiom.Desktop>
</OnIdiom>
</Label.FontSize>
</Label>
</StackLayout>
</StackLayout>
</Frame>
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.Footer>
<Label/>
</ListView.Footer>
</ListView>
我在 UI 上列出了一些项目。异常仅显示在实际 iPhone 设备上。在 android 设备和 iPhone 模拟器上一切正常。
XF版本：4.8.0.1821
Mac 对比版本：8.10.2
Xcode版本：12.5.1
iPhone 版本：14.6、14.4
问题出在日期和时间值上。
日期问题：在 Android 设备和 ios 模拟器上，日期格式为 dd/mm/yyyy。但是在实际的 iPhone 设备上，日期格式是 dd-mm-yyyy.
时间问题：在 ios 模拟器上，我们得到时间的 AM 或 PM 值，但在实际 iPhone 设备上，时间是 24 小时格式，没有 AM 或 PM。