I load a pdf document through pdfToolbarMain's load button in WPF C# app.

When I try to close it on a click of a close button

pdfViewer1.CloseDocument();

, it throws an error saying "KeyNotFoundException was unhandled", "An unhandled exception of type 'System.Collection.Generic.KeyNotFoundException occured in mscorelib.dll

Stack trace shows this

at Patagames.Pdf.Pdfium.FPDFDOC_ExitFormFillEnvironment_native(IntPtr form_handle)
at Patagames.Pdf.Pdfium.FPDFDOC_ExitFormFillEnvironment(IntPtr form_handle)
at Patagames.Pdf.Net.PdfForms.Dispose(Boolean disposing)
at Patagames.Pdf.Net.PdfForms.Dispose()
at Patagames.Pdf.Net.PdfDocument.Dispose(Boolean disposing)
at Patagames.Pdf.Net.PdfDocument.Dispose()
at Patagames.Pdf.Net.Controls.Wpf.PdfViewer.CloseDocument()
at WPF_PDFium_NUGET.MainWindow.BtnClose_Click(Object sender, RoutedEventArgs e) in c:\DEV\Prototypes\PDF\WPF_PDFium_NUGET\WPF_PDFium_NUGET\MainWindow.xaml.cs:line 87
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at WPF_PDFium_NUGET.App.Main() in c:\DEV\Prototypes\PDF\WPF_PDFium_NUGET\WPF_PDFium_NUGET\obj\Debug\App.g.cs:line 0
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

BtnClose_Click function has this line pdfViewer1.CloseDocument(); which results in crash every time.

I am also trying to wrap up this evaluation phase of these controls by this weekend. Can you also provide me the code snippets to fill fields in a pdf doc with values and how to extract values of fields in an editable pdf document?


using Patagames.Pdf.Net;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;


namespace WPF_PDFium_NUGET
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
protected bool isChanged { get; set; }


public MainWindow()
{
InitializeComponent();
PdfCommon.Initialize();
pdfViewer1.DocumentLoaded += pdfViewer1_DocumentLoaded;
pdfViewer1.FillForms.FieldChanged += FillForms_FieldChanged;
}


void pdfViewer1_DocumentLoaded(object sender, EventArgs e)
{
isChanged = false;


//throw new NotImplementedException();
}


private void btnSave_Click(object sender, RoutedEventArgs e)
{

SaveDocument(false);


}

private void SaveDocument(bool isConfirmFirst)
{

if (isChanged == true)
{
var msgBoxResult = MessageBoxResult.Yes;

if (isConfirmFirst == true)
{
//Save only if the user has changed anything in the form.
msgBoxResult = MessageBox.Show("Save the changes?", "Save Form", MessageBoxButton.YesNo);
}

if (msgBoxResult == MessageBoxResult.Yes)
{
if (pdfViewer1.FillForms.ForceToKillFocus() == true)
{
//User Wants to Save
pdfViewer1.Document.Save("MKSTest.pdf", Patagames.Pdf.Enums.SaveFlags.NoIncremental);
}
}
}
}

private void BtnClose_Click(object sender, RoutedEventArgs e)
{
SaveDocument(true);
pdfViewer1.CloseDocument();

}

void FillForms_FieldChanged(object sender, EventArgs e)
{
isChanged = true;
//throw new NotImplementedException();
}

private void btnTest_Click(object sender, RoutedEventArgs e)
{
//{
// string text=null;

// var asdf = PdfFieldCollections
// f
// foreach (var field in doc.FormFill.InterForm.Fields)
// {
// text += field.ToString();

// }

// MessageBox.Show(text);

//Open and load a PDF document from a file.
using (var doc = PdfDocument.Load("MKSTest.pdf"))

foreach (var page in doc.Pages)
{
//Gets number of characters in a page or -1 for error.
//Generated characters, like additional space characters, new line characters, are also counted.
int totalCharCount = page.Text.CountChars;

//Extract text from page to the string
string text = page.Text.GetText(0, totalCharCount);

//MessageBox.Show(text);
}

//}
}


}
}

I have tried your code. It works fine for me.
Please note, MKSTest.pdf must point to a new file.
You can't save changes in the same file which already opened in the Viewer.

Could you please provide a full solution with all necessary files (including your source PDF document)?

Edited by user Sunday, July 17, 2016 4:44:17 AM(UTC)  | Reason: Not specified

An issue from first topic was fixed - http://forum.patagames.c...-on-Jul-21--2016#post439