I'm trying to replace the Code view of PropertyPath in {MF PropertyPath} to {MF DisplayName}, which still uses PropertyPath inside.
[XamlSerializable]publicstringDisplayName{ get{ return_displayName.GetValue(); } set { if(!_displayName.IsNestedField && _displayName.GetValue() == value) return; _displayName.SetValue(value); InvalidateCode(); }}[XamlSerializable]publicstringPropertyPath{ get { return_propertyPath.GetValue(); } set { if(!_propertyPath.IsNestedField && _propertyPath.GetValue() == value) return; _propertyPath.SetValue(value); InvalidateCode(); }}They XamlSerializable, then there should be no problems.
But there is a problem with the implementation of CopyPropertiesFromCodeExpression.
protectedoverridevoidCopyPropertiesFromCodeExpression(FieldCodeExpression fieldCodeExpression){ if(fieldCodeExpression.FieldArgumentNode != null) { _propertyPath.SetValue(fieldCodeExpression.FieldArgumentNode); _displayName.SetValue(fieldCodeExpression.FieldArgumentNode); } else { PropertyPath = null; DisplayName = null; }}
I get a blank page without this method. Otherwise, it tries to substitute the DisplayName in PropertyPath (???).
Full Code:
publicclassEnchantedMergeField : CodeBasedField{ publicstaticreadonlystringFieldType = "MF"; publicstaticreadonlyFieldPropertyDefinition PropertyPathProperty = newFieldPropertyDefinition("PropertyPath"); publicstaticreadonlyFieldPropertyDefinition DisplayNameProperty = newFieldPropertyDefinition("DisplayName"); privatereadonlyFieldProperty _propertyPath; privatereadonlyFieldProperty _displayName; staticEnchantedMergeField() { CodeBasedFieldFactory.RegisterFieldType(FieldType, () => newEnchantedMergeField()); } publicEnchantedMergeField() { _propertyPath = newFieldProperty(this, PropertyPathProperty); _displayName = newFieldProperty(this, DisplayNameProperty); } publicoverridestringFieldTypeName { get{ returnFieldType; } } publicoverrideboolHasDisplayNameFragment { get { returntrue; } } [XamlSerializable] publicstringDisplayName { get{ return_displayName.GetValue(); } set { if(!_displayName.IsNestedField && _displayName.GetValue() == value) return; _displayName.SetValue(value); InvalidateCode(); } } [XamlSerializable] publicstringPropertyPath { get { return_propertyPath.GetValue(); } set { if(!_propertyPath.IsNestedField && _propertyPath.GetValue() == value) return; _propertyPath.SetValue(value); InvalidateCode(); } } protectedoverridevoidCopyPropertiesFromCodeExpression(FieldCodeExpression fieldCodeExpression) { if(fieldCodeExpression.FieldArgumentNode != null) { _propertyPath.SetValue(fieldCodeExpression.FieldArgumentNode); _displayName.SetValue(fieldCodeExpression.FieldArgumentNode); } else { PropertyPath = null; DisplayName = null; } } publicoverridevoidCopyPropertiesFrom(Field fromField) { base.CopyPropertiesFrom(fromField); var mergeField = (EnchantedMergeField) fromField; _propertyPath.CopyPropertiesFrom(mergeField._propertyPath); _displayName.CopyPropertiesFrom(mergeField._displayName); } publicoverrideField CreateInstance() { returnnewEnchantedMergeField(); } privatestringConvertToString(objectvalue) { stringconvertedValue; if(value isstring) convertedValue = (string) value; elseif(value isDateTime) convertedValue = ((DateTime) value).ToString(DateTimeFormatting); else { try { convertedValue = Convert.ToDecimal(value).ToString(NumericFormatting); } catch(Exception) { convertedValue = value.ToString(); } } returnconvertedValue; } protectedoverrideDocumentFragment GetResultFragment() { stringvalue = null; if(Document != null&& !string.IsNullOrEmpty(PropertyPath)) { var currentItem = Document.MailMergeDataSource.CurrentItem; if(currentItem != null) { value = ConvertToString(GetNestedPropertyValue(currentItem, PropertyPath)); } } returnCreateFragmentFromText(value); } protectedoverridevoidBuildCodeOverride() { CodeBuilder.SetFieldArgument(_propertyPath); } protectedoverrideDocumentFragment GetCodeFragment() { returnCreateFragmentFromText(string.Format("{{{0} {1}}}", FieldType, DisplayName)); } protectedoverrideDocumentFragment GetDisplayNameFragment() { returnCreateFragmentFromText(string.Format(DisplayNameFragmentFormat, DisplayName)); } privatestaticobjectGetNestedPropertyValue(objectvalue, stringpropertyPath) { if(value == null|| string.IsNullOrEmpty(propertyPath)) returnnull; var currentType = value.GetType(); var path = propertyPath.Split('.'); foreach(var propertyStep inpath) { var prop = currentType.GetProperty(propertyStep); if(prop == null|| value == null) { value = "#{ERROR}#"; break; } value = prop.GetValue(value, null); currentType = prop.PropertyType; } returnvalue; }}
