AnalysisWarning.BackgroundException Property
The Exception that is thrown if an exception occurs in during background analysis of ink.
Namespace: System.Windows.Ink
Assembly: IAWinFX (in iawinfx.dll)
XML Namespace: https://schemas.microsoft.com/winfx/2006/xaml/presentation
Syntax
'Declaration
Public ReadOnly Property BackgroundException As Exception
'Usage
Dim instance As AnalysisWarning
Dim value As Exception
value = instance.BackgroundException
public Exception BackgroundException { get; }
public:
property Exception^ BackgroundException {
Exception^ get ();
}
/** @property */
public Exception get_BackgroundException ()
public function get BackgroundException () : Exception
Not applicable.
Property Value
The Exception that was thrown during background analysis.
Remarks
If an Exception occurs after a call to System.Windows.Ink.InkAnalyzerBase.BackgroundAnalyze, then the exception cannot be thrown because the exception is occurring in a different thread and there would be no way to catch it. Instead, in the Results event handler, the Status property of the ResultsUpdatedEventArgs object will have an AnalysisWarning object of type BackgroundException in its Warnings collection. The BackgroundException property of this AnalysisWarning object will contain the Exception that was thrown during background analysis. In general, you will want to rethrow the Exception so that it can be caught elsewhere in your application.
Example
The following example shows an AnalysisWarning, warning, which is checked to see if it is associated with any hints. If the AnalysisWarning is of type BackgroundException , then you should attempt to save as much document state as possible and then rethrow the exception so that it can be caught by an exception handler. Even if no exception handler is in place, then a program error debugger, such as Dr. Watson, can be invoked. The InkAnalyzer will need to be reinitialized after catching the exception.
' Loop through warnings
Dim warning As AnalysisWarning
For Each warning In status.Warnings
Select Case warning.WarningCode
Case AnalysisWarningCode.Aborted
message &= "Analysis operation was aborted. "
Case AnalysisWarningCode.BackgroundException
' This is a fatal warning. Throw an exception.
' First, attempt to save as much doc state as possible
' ...
' Rethrow the exception so that it can be caught by an exception
' handler (or if there is no exception handler, a program error
' debugger such as Dr. Watson can be invoked)
Throw warning.BackgroundException
Case AnalysisWarningCode.ConfirmedWithoutInkRecognition
message &= "Node was confirmed without ink recognition having been performed. "
Case AnalysisWarningCode.ContextNodeLocationNotSet
message &= "Node does not have a proper location set. "
Case AnalysisWarningCode.FactoidCoercionNotSupported
message &= "Factoid coercion failed "
If Not (warning.AnalysisHint Is Nothing) AndAlso _
Not (warning.AnalysisHint.Factoid Is Nothing) Then
message &= "for factoid: " & warning.AnalysisHint.Factoid & ". "
End If
Case AnalysisWarningCode.FactoidNotSupported
If Not (warning.AnalysisHint Is Nothing) AndAlso _
Not (warning.AnalysisHint.Factoid Is Nothing) Then
message &= warning.AnalysisHint.Factoid & " factoid was not respected. "
End If
Case AnalysisWarningCode.GuideNotSupported
message &= "Guide was not respected. "
Case AnalysisWarningCode.AddInkToRecognizerFailed
message &= "Ink could not be added to the InkRecognizer. "
Case AnalysisWarningCode.InkRecognizerInitializationFailed
message &= "The InkRecognizer failed to initialize. "
Case AnalysisWarningCode.NoMatchingInkRecognizerFound
message &= "There are no ink recognizers meeting the language or capabilities needed. "
Case AnalysisWarningCode.LanguageIdNotRespected
message &= "The language ID set on a stroke did not match the language ID of the InkRecognizer. "
Case AnalysisWarningCode.PartialDictionaryTermsNotSupported
message &= "Partial dictionary terms could not be returned from the text recognizer. "
Case AnalysisWarningCode.TextRecognitionProcessFailed
message &= "The text recognition process failed. "
Case AnalysisWarningCode.SetPrefixSuffixFailed
message &= "The text recognizer was unable to respect either the prefix or suffix. "
If Not (warning.AnalysisHint Is Nothing) AndAlso _
Not (warning.AnalysisHint.PrefixText Is Nothing) Then
message &= "Prefix: " & warning.AnalysisHint.PrefixText & ". "
End If
If Not (warning.AnalysisHint Is Nothing) AndAlso _
Not (warning.AnalysisHint.SuffixText Is Nothing) Then
message &= "Suffix: " & warning.AnalysisHint.SuffixText & ". "
End If
Case AnalysisWarningCode.WordlistNotSupported
message &= "Wordlist was not respected. "
Case AnalysisWarningCode.WordModeNotSupported
message &= "Word mode was not respected. "
End Select
' Add node id information
Dim id As Guid
For Each id In warning.GetNodeIds()
message &= "Id: " & id.ToString() & " "
Next id
' Add hint information
If Not (warning.AnalysisHint Is Nothing) Then
Dim hint As AnalysisHintNode = warning.AnalysisHint
message &= Environment.NewLine & "Hint information: "
message &= "AllowPartialDictionaryTerms"
If hint.AllowPartialDictionaryTerms Then
message &= " = true "
Else
message &= " = false "
End If
message &= "CoerceToFactoid"
If hint.CoerceToFactoid Then
message &= " = true "
Else
message &= " = false "
End If
If Not (hint.Factoid Is Nothing) Then
message &= "Factoid = " & warning.AnalysisHint.Factoid & " "
End If
message &= "Guide Drawn Box = (" _
& hint.Guide.DrawnBoxTop.ToString() & ", " _
& hint.Guide.DrawnBoxLeft.ToString() & ", " _
& hint.Guide.DrawnBoxBottom.ToString() & ", " _
& hint.Guide.DrawnBoxRight.ToString() & ", " & ")"
message &= "Guide Writing Box = (" _
& hint.Guide.WritingBoxTop.ToString() & ", " _
& hint.Guide.WritingBoxLeft.ToString() & ", " _
& hint.Guide.WritingBoxBottom.ToString() & ", " _
& hint.Guide.WritingBoxRight.ToString() & ", " & ")"
If Not (hint.Name Is Nothing) Then
message &= "Name = " & warning.AnalysisHint.Name & " "
End If
If Not (hint.PrefixText Is Nothing) Then
message &= "PrefixText = " & warning.AnalysisHint.PrefixText & " "
End If
If Not (hint.SuffixText Is Nothing) Then
message &= "SuffixText = " & warning.AnalysisHint.SuffixText & " "
End If
message &= "WordMode"
If hint.WordMode Then
message &= " = true"
Else
message &= " = false"
End If
End If
message &= Environment.NewLine
Next warning
// Loop through warnings
foreach (AnalysisWarning warning in status.Warnings)
{
switch (warning.WarningCode)
{
case AnalysisWarningCode.Aborted:
message += "Analysis operation was aborted. ";
break;
case AnalysisWarningCode.BackgroundException:
// This is a fatal warning. Throw an exception.
// First, attempt to save as much doc state as possible
// ...
// Rethrow the exception so that it can be caught by an exception
// handler (or if there is no exception handler, a program error
// debugger such as Dr. Watson can be invoked)
throw (warning.BackgroundException);
case AnalysisWarningCode.ConfirmedWithoutInkRecognition:
message += "Node was confirmed without ink recognition having been performed. ";
break;
case AnalysisWarningCode.ContextNodeLocationNotSet:
message += "Node does not have a proper location set. ";
break;
case AnalysisWarningCode.FactoidCoercionNotSupported:
message += "Factoid coercion failed ";
if (warning.AnalysisHint != null && warning.AnalysisHint.Factoid != null)
{
message += "for factoid: " + warning.AnalysisHint.Factoid + ". ";
}
break;
case AnalysisWarningCode.FactoidNotSupported:
if (warning.AnalysisHint != null && warning.AnalysisHint.Factoid != null)
{
message += warning.AnalysisHint.Factoid + " factoid was not respected. ";
}
break;
case AnalysisWarningCode.GuideNotSupported:
message += "Guide was not respected. ";
break;
case AnalysisWarningCode.AddInkToRecognizerFailed:
message += "Ink could not be added to the InkRecognizer. ";
break;
case AnalysisWarningCode.InkRecognizerInitializationFailed:
message += "The InkRecognizer failed to initialize. ";
break;
case AnalysisWarningCode.NoMatchingInkRecognizerFound:
message += "There are no ink recognizers meeting the language or capabilities needed. ";
break;
case AnalysisWarningCode.LanguageIdNotRespected:
message += "The language ID set on a stroke did not match the language ID of the InkRecognizer. ";
break;
case AnalysisWarningCode.PartialDictionaryTermsNotSupported:
message += "Partial dictionary terms could not be returned from the text recognizer. ";
break;
case AnalysisWarningCode.TextRecognitionProcessFailed:
message += "The text recognition process failed. ";
break;
case AnalysisWarningCode.SetPrefixSuffixFailed:
message += "The text recognizer was unable to respect either the prefix or suffix. ";
if (warning.AnalysisHint != null && warning.AnalysisHint.PrefixText != null)
{
message += "Prefix: " + warning.AnalysisHint.PrefixText + ". ";
}
if (warning.AnalysisHint != null && warning.AnalysisHint.SuffixText != null)
{
message += "Suffix: " + warning.AnalysisHint.SuffixText + ". ";
}
break;
case AnalysisWarningCode.WordlistNotSupported:
message += "Wordlist was not respected. ";
break;
case AnalysisWarningCode.WordModeNotSupported:
message += "Word mode was not respected. ";
break;
}
// Add node id information
foreach (Guid id in warning.GetNodeIds())
message += "Id: " + id.ToString() + " ";
// Add hint information
if (warning.AnalysisHint != null)
{
AnalysisHintNode hint = warning.AnalysisHint;
message += Environment.NewLine + "Hint information: ";
message += "AllowPartialDictionaryTerms";
if (hint.AllowPartialDictionaryTerms)
message += " = true ";
else
message += " = false ";
message += "CoerceToFactoid";
if (hint.CoerceToFactoid)
message += " = true ";
else
message += " = false ";
if (hint.Factoid != null)
message += "Factoid = " + warning.AnalysisHint.Factoid + " ";
message += "Guide Drawn Box = (" +
hint.Guide.DrawnBoxTop.ToString() + ", " +
hint.Guide.DrawnBoxLeft.ToString() + ", " +
hint.Guide.DrawnBoxBottom.ToString() + ", " +
hint.Guide.DrawnBoxRight.ToString() + ", " + ")";
message += "Guide Writing Box = (" +
hint.Guide.WritingBoxTop.ToString() + ", " +
hint.Guide.WritingBoxLeft.ToString() + ", " +
hint.Guide.WritingBoxBottom.ToString() + ", " +
hint.Guide.WritingBoxRight.ToString() + ", " + ")";
if (hint.Name != null)
message += "Name = " + warning.AnalysisHint.Name + " ";
if (hint.PrefixText != null)
message += "PrefixText = " + warning.AnalysisHint.PrefixText + " ";
if (hint.SuffixText != null)
message += "SuffixText = " + warning.AnalysisHint.SuffixText + " ";
message += "WordMode";
if (hint.WordMode)
message += " = true";
else
message += " = false";
}
message += Environment.NewLine;
}
Platforms
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
Version Information
.NET Framework
Supported in: 3.0
See Also
Reference
AnalysisWarning Class
AnalysisWarning Members
System.Windows.Ink Namespace
System.Windows.Ink.InkAnalyzerBase.BackgroundAnalyze