So, I am creating a Xamarin Forms application, and I am wondering how to determine the cause of this exception: TargetParameterCountException: Number of parameters specified does not match the expected number
The stack trace does not point to any of our code (the stack trace only says that exceptions are UIApplication.Main from UIApplication.Main ).
I just don’t know how to track where this exception comes from - if I go through my code that shows the debug trace, it works in turn, this code works fine.
This problem only occurs when you first use the application after installing it, which gives me the key, but I do not know where to look for further research.
EDIT:
As requested, here is the stack trace:
System.Reflection.TargetParameterCountException: Number of parameters specified does not match the expected number. at System.Reflection.MonoMethod.ConvertValues (System.Reflection.Binder binder, System.Object[] args, System.Reflection.ParameterInfo[] pinfo, System.Globalization.CultureInfo culture, System.Reflection.BindingFlags invokeAttr) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.0.0.0/src/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:327 at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00011] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.0.0.0/src/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:293 at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.0.0.0/src/mono/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229 at Xamarin.Forms.BindingExpression+BindingExpressionPart.TryGetValue (System.Object source, System.Object& value) [0x00043] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:562 at Xamarin.Forms.BindingExpression.ApplyCore (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property, System.Boolean fromTarget) [0x000d4] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:131 at Xamarin.Forms.BindingExpression.Apply (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property) [0x0006b] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:76 at Xamarin.Forms.Binding.Apply (System.Object newContext, Xamarin.Forms.BindableObject bindObj, Xamarin.Forms.BindableProperty targetProperty) [0x00042] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Binding.cs:123 at Xamarin.Forms.BindableObject.ApplyBindings (System.Boolean skipBindingContext) [0x0003b] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:417 at Xamarin.Forms.BindableObject.ApplyBindings () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:124 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x0005a] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:118 at Xamarin.Forms.Element.SetChildInheritedBindingContext (Xamarin.Forms.Element child, System.Object context) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:483 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00021] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:333 at Xamarin.Forms.View.OnBindingContextChanged () [0x00042] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\View.cs:99 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00060] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:119 at Xamarin.Forms.Element.SetChildInheritedBindingContext (Xamarin.Forms.Element child, System.Object context) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:483 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00021] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:333 at Xamarin.Forms.View.OnBindingContextChanged () [0x00042] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\View.cs:99 at Xamarin.Forms.Grid.OnBindingContextChanged () [0x00006] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Grid.cs:139 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00060] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:119 at Xamarin.Forms.Element.SetChildInheritedBindingContext (Xamarin.Forms.Element child, System.Object context) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:483 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00021] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:333 at Xamarin.Forms.View.OnBindingContextChanged () [0x00042] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\View.cs:99 at Xamarin.Forms.Grid.OnBindingContextChanged () [0x00006] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Grid.cs:139 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00060] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:119 at Xamarin.Forms.Element.SetChildInheritedBindingContext (Xamarin.Forms.Element child, System.Object context) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:483 at Xamarin.Forms.TemplatedView.SetChildInheritedBindingContext (Xamarin.Forms.Element child, System.Object context) [0x00008] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\TemplatedView.cs:65 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00021] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:333 at Xamarin.Forms.View.OnBindingContextChanged () [0x00042] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\View.cs:99 at Xamarin.Forms.ContentView.OnBindingContextChanged () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\ContentView.cs:16 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00060] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:119 at Xamarin.Forms.Element.SetChildInheritedBindingContext (Xamarin.Forms.Element child, System.Object context) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:483 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00021] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:333 at Xamarin.Forms.View.OnBindingContextChanged () [0x00042] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\View.cs:99 at Xamarin.Forms.BindableObject.SetInheritedBindingContext (Xamarin.Forms.BindableObject bindable, System.Object value) [0x00060] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:119 at Xamarin.Forms.Element.SetChildInheritedBindingContext (Xamarin.Forms.Element child, System.Object context) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:483 at Xamarin.Forms.Element.OnBindingContextChanged () [0x00021] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:333 at Xamarin.Forms.Cell.OnBindingContextChanged () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Cells\Cell.cs:118 at Xamarin.Forms.BindableObject.BindingContextPropertyChanged (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x0000e] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:437 at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.BindableObject+SetValueFlags attributes, System.Boolean silent) [0x00108] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:592 at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.BindableObject+SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x0015b] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:386 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x0005f] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:539 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:83 at Xamarin.Forms.BindableObject.set_BindingContext (System.Object value) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:24 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].UpdateContent (TItem content, System.Int32 index, System.Object item) [0x00000] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].CreateContent (System.Int32 index, System.Object item, System.Boolean insert) [0x00038] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].GetOrCreateContent (System.Int32 index, System.Object item) [0x00023] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].get_Item (System.Int32 index) [0x0000e] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.Platform.iOS.ListViewRenderer+ListViewDataSource.GetHeightForHeader (UIKit.UITableView tableView, System.nint section) [0x0000d] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.iOS\Renderers\ListViewRenderer.cs:782 at (wrapper managed-to-native) ObjCRuntime.Messaging:void_objc_msgSend (intptr,intptr) at UIKit.UITableView.ReloadData () [0x00010] in /Users/builder/data/lanes/5024/152b654a/source/xamarin-macios/src/build/ios/native/UIKit/UITableView.g.cs:792 at Xamarin.Forms.Platform.iOS.ListViewRenderer.UpdateItems (System.Collections.Specialized.NotifyCollectionChangedEventArgs e, System.Int32 section, System.Boolean resetWhenGrouped) [0x00240] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.iOS\Renderers\ListViewRenderer.cs:549 at Xamarin.Forms.Platform.iOS.ListViewRenderer.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.iOS\Renderers\ListViewRenderer.cs:283 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000a] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].OnCollectionChangedGrouped (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x000e3] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e, System.Boolean fixWindows) [0x00008] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.TemplatedItemsList`2[TView,TItem].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in <7fc7c54b5e2d419395df064dc5addbb6>:0 at Xamarin.Forms.ListProxy.OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000a] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\ListProxy.cs:230 at Xamarin.Forms.ListProxy+<>c__DisplayClass32_0.<OnCollectionChanged>b__0 () [0x00018] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\ListProxy.cs:203 at Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Users/builder/data/lanes/5024/152b654a/source/xamarin-macios/src/Foundation/NSAction.cs:163 at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr) at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/5024/152b654a/source/xamarin-macios/src/UIKit/UIApplication.cs:79 at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/5024/152b654a/source/xamarin-macios/src/UIKit/UIApplication.cs:63 at Mobile.Inspections.iOS.Application.Main (System.String[] args) [0x00002] in C:\Projects\...iOS\Main.cs:22