Null error on RadDocument, DocumentTextSearch FindAll()

[Steve]

I am doing a search/replace in code using the RadDocument and I am getting a strange null error.

Here is the code:

doc.Selection.Clear();
            DocumentTextSearch search = new DocumentTextSearch(doc);
            var rangesTrackingDocumentChanges = new List<TextRange>();
            var resultRanges = search.FindAll(searchText);

            foreach (var textRange in resultRanges)
            {
                TextRange newRange = new TextRange(new DocumentPosition(textRange.StartPosition, true), new DocumentPosition(textRange.EndPosition, true));
                rangesTrackingDocumentChanges.Add(newRange);
            }

            foreach (var textRange in rangesTrackingDocumentChanges)
            {
                doc.CaretPosition.MoveToPosition(textRange.StartPosition);
                doc.DeleteRange(textRange.StartPosition, textRange.EndPosition);
                doc.Insert(mergeText, new Telerik.Windows.Documents.Model.Styles.StyleDefinition());
                textRange.StartPosition.Dispose();
                textRange.EndPosition.Dispose();
            }

When the RadDocument is simple,this works fine, however, when I put the Merge fields in Tables, it is throwing an error on the search.FindAll() method:

System.NullReferenceException: Object reference not set to an instance of an object.
  "   at Telerik.Windows.Documents.TextSearch.DocumentTextMap.MoveToFirstBoxInWord(DocumentPosition position) in c:\\TB\\102\\WPF_Scrum\\Release_WPF\\Sources\\Development\\Documents\\Core\\TextSearch\\DocumentTextMap.cs:line 313\r\n   at Telerik.Windows.Documents.TextSearch.DocumentTextMap.InitMap(DocumentPosition fromPosition, DocumentPosition toPosition) in c:\\TB\\102\\WPF_Scrum\\Release_WPF\\Sources\\Development\\Documents\\Core\\TextSearch\\DocumentTextMap.cs:line 115\r\n   at Telerik.Windows.Documents.TextSearch.DocumentTextSearch.FindInternal(String regEx, DocumentPosition fromPosition, DocumentPosition toPosition, Boolean findFirst) in c:\\TB\\102\\WPF_Scrum\\Release_WPF\\Sources\\Development\\Documents\\Core\\TextSearch\\DocumentTextSearch.cs:line 90\r\n   at Telerik.Windows.Documents.TextSearch.DocumentTextSearch.FindAll(String regEx) in c:\\TB\\102\\WPF_Scrum\\Release_WPF\\Sources\\Development\\Documents\\Core\\TextSearch\\DocumentTextSearch.cs:line 52\r\n   at Service.ServiceHandler.Documentation.DocDataMgr.MergeText(RadDocument doc, String mergeName, String mergeText) in N:\\BMS\\svn_r3\\Rf3Db\\Service\\ServiceHandler\\Documentation\\DocDataMgr.cs:line 947"

Here is the text I am searching for:   "{ MERGEFIELD TmHeader }"

Here is the RadDocument:  

"<t:RadDocument xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" xmlns:t=\"clr-namespace:Telerik.Windows.Documents.Model;assembly=Telerik.Windows.Documents\" xmlns:s=\"clr-namespace:Telerik.Windows.Documents.Model.Styles;assembly=Telerik.Windows.Documents\" version=\"1.2\" LayoutMode=\"Flow\" LineSpacing=\"1.14999997615814\" LineSpacingType=\"Auto\" ParagraphDefaultSpacingAfter=\"12\" ParagraphDefaultSpacingBefore=\"0\" SectionDefaultPageSize=\"816,1056\" StyleName=\"defaultDocumentStyle\">\r\n  <t:RadDocument.ProtectionSettings>\r\n    <t:DocumentProtectionSettings EnableDocumentProtection=\"False\" Enforce=\"False\" HashingAlgorithm=\"None\" HashingSpinCount=\"0\" ProtectionMode=\"ReadOnly\" />\r\n  </t:RadDocument.ProtectionSettings>\r\n  <t:RadDocument.Styles>\r\n    <s:StyleDefinition DisplayName=\"Document Default Style\" IsCustom=\"False\" IsDefault=\"False\" IsPrimary=\"True\" Name=\"defaultDocumentStyle\" Type=\"Default\">\r\n      <s:StyleDefinition.ParagraphStyle>\r\n        <s:ParagraphProperties LineSpacing=\"1.14999997615814\" SpacingAfter=\"12\" />\r\n      </s:StyleDefinition.ParagraphStyle>\r\n      <s:StyleDefinition.SpanStyle>\r\n        <s:SpanProperties FontFamily=\"Verdana\" FontSize=\"16\" FontStyle=\"Normal\" FontWeight=\"Normal\" />\r\n      </s:StyleDefinition.SpanStyle>\r\n    </s:StyleDefinition>\r\n    <s:StyleDefinition BasedOnName=\"TableNormal\" DisplayName=\"TableGrid\" IsCustom=\"False\" IsDefault=\"False\" IsPrimary=\"True\" Name=\"TableGrid\" Type=\"Table\">\r\n      <s:StyleDefinition.ParagraphStyle>\r\n        <s:ParagraphProperties LineSpacing=\"1\" SpacingAfter=\"0\" />\r\n      </s:StyleDefinition.ParagraphStyle>\r\n      <s:StyleDefinition.TableStyle>\r\n        <s:TableProperties Borders=\"1,Single,#FF000000\" />\r\n      </s:StyleDefinition.TableStyle>\r\n    </s:StyleDefinition>\r\n    <s:StyleDefinition DisplayName=\"TableNormal\" IsCustom=\"False\" IsDefault=\"True\" IsPrimary=\"True\" Name=\"TableNormal\" Type=\"Table\" />\r\n  </t:RadDocument.Styles>\r\n  <t:Section>\r\n    <t:Paragraph TextAlignment=\"Left\">\r\n      <t:Paragraph.TabStops>\r\n        <t:TabStop Position=\"208\" TabStopType=\"Left\" />\r\n      </t:Paragraph.TabStops>\r\n    </t:Paragraph>\r\n    <t:Paragraph TextAlignment=\"Left\">\r\n      <t:Paragraph.TabStops>\r\n        <t:TabStop Position=\"208\" TabStopType=\"Left\" />\r\n      </t:Paragraph.TabStops>\r\n      <t:Span Text=\"{}{ MERGEFIELD TmDate } { MERGEFIELD TmLeft }{ MERGEFIELD TmRight }\" />\r\n    </t:Paragraph>\r\n    <t:Paragraph TextAlignment=\"Left\">\r\n      <t:Paragraph.TabStops>\r\n        <t:TabStop Position=\"208\" TabStopType=\"Left\" />\r\n      </t:Paragraph.TabStops>\r\n    </t:Paragraph>\r\n    <t:Table GridColumnWidthsSerializationInfo=\"\" LayoutMode=\"AutoFit\" PreferredWidth=\"Auto\" StyleName=\"TableGrid\" TableIndent=\"0\">\r\n      <t:TableRow>\r\n        <t:TableCell ColumnSpan=\"1\" RowSpan=\"1\">\r\n          <t:Paragraph>\r\n            <t:Span Text=\" { MERGEFIELD TmHeader } \" />\r\n          </t:Paragraph>\r\n        </t:TableCell>\r\n        <t:TableCell ColumnSpan=\"1\" RowSpan=\"1\">\r\n          <t:Paragraph />\r\n        </t:TableCell>\r\n        <t:TableCell ColumnSpan=\"1\" RowSpan=\"1\">\r\n          <t:Paragraph />\r\n        </t:TableCell>\r\n      </t:TableRow>\r\n      <t:TableRow>\r\n        <t:TableCell ColumnSpan=\"1\" RowSpan=\"1\">\r\n          <t:Paragraph />\r\n        </t:TableCell>\r\n        <t:TableCell ColumnSpan=\"1\" RowSpan=\"1\">\r\n          <t:Paragraph />\r\n        </t:TableCell>\r\n        <t:TableCell ColumnSpan=\"1\" RowSpan=\"1\">\r\n          <t:Paragraph />\r\n        </t:TableCell>\r\n      </t:TableRow>\r\n    </t:Table>\r\n    <t:Paragraph TextAlignment=\"Left\">\r\n      <t:Paragraph.TabStops>\r\n        <t:TabStop Position=\"208\" TabStopType=\"Left\" />\r\n      </t:Paragraph.TabStops>\r\n    </t:Paragraph>\r\n  </t:Section>\r\n</t:RadDocument>"

[Martin Ivanov]

Hi Steve,

We imported your document and made a button replacing the desired field with a string using your code but were unable to reproduce the exception. The string was successfully replaced.

We find your case of replacing merge fields rather unusual. If you are not familiar with mail merge data source and the way the display mode of merge fields is changed, you can refer to this article. However, if you want to modify the merge fields using document search, we would appreciate it if you could isolate the problem in a sample project reproducing the issue and send it to us in a support ticket.

Looking forward to your response.

Kind regards,
Martin
the Telerik team