# Aspose.Tasks for .NET 22.3 Release Notes

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## All Changes

Key Summary Issue Type
TASKSNET-10480 Add an API to set user-specified callback which allows to substitute absent fonts when a project is rendered to a graphical format Enhancement
TASKSNET-10485 Fix rendering of holidays in Gantt Chart view Bug
TASKSNET-10429 Fix exception when opening MPP file in projects targeting .NET 6.0 in *nix environment Bug
TASKSNET-10483 Fix parsing of formulas with different separators Bug
TASKSNET-10479 Fix differences of calculated custom fields between versions Bug

## Public API and Backwards Incompatible Changes

The following public types were added: Description
Aspose.Tasks.FontResolveCallbackDelegate Represents a method callback to handle font resolve event.
Aspose.Tasks.FontResolveEventArgs Provides arguments for the callback that is invoked when font is resolved.
Aspose.Tasks.SummaryRowsCalculationType Specifies the type of a calculation of the custom attribute’s value for summary rows.
Aspose.Tasks.Visualization.FontStyles Specifies style information applied to text.
The following public methods and properties were added: Description
Aspose.Tasks.ExtendedAttributeDefinition.SummaryRowsCalculationType Gets or sets the type of calculation of the custom attribute’s value for summary rows.
Aspose.Tasks.FontResolveEventArgs.RequestedFontName Gets the name of requested font.
Aspose.Tasks.FontResolveEventArgs.ResolvedFontName Gets or sets the name of resolved font. Can be set to control fonts used to render a view.
Aspose.Tasks.OleObject.#ctor Initializes a new instance of the class.
Aspose.Tasks.Saving.HtmlSaveOptions.FontResolveCallback Gets or sets a callback which can be used to customize resolved fonts.
Aspose.Tasks.Saving.ImageSaveOptions.FontResolveCallback Gets or sets a callback which can be used to customize resolved fonts.
Aspose.Tasks.Saving.PdfSaveOptions.FontResolveCallback Gets or sets a callback which can be used to customize resolved fonts.
Aspose.Tasks.Visualization.FontDescriptor.#ctor(System.String,System.Single) Initializes a new instance of the class with the specified font family and size.
Aspose.Tasks.Visualization.FontDescriptor.#ctor(System.String,System.Single,Aspose.Tasks.Visualization.FontStyles) Initializes a new instance of the class with the specified font family, size and style.
Aspose.Tasks.Visualization.FontDescriptor.FontFamily Gets the name of the font’s family.
Aspose.Tasks.Visualization.FontDescriptor.Size Gets size of the font.
Aspose.Tasks.Visualization.FontDescriptor.Style Gets style of the font.
Aspose.Tasks.Visualization.TableTextStyle.#ctor(System.Int32,Aspose.Tasks.Visualization.FontDescriptor) Initializes a new instance of the class with the specified font.
Aspose.Tasks.Visualization.TableTextStyle.#ctor(System.Int32,System.Single,Aspose.Tasks.Visualization.FontStyles) Initializes a new instance of the class with the specified font size and font style.
Aspose.Tasks.Visualization.TableTextStyle.#ctor(System.Int32,Aspose.Tasks.Visualization.FontStyles) Initializes a new instance of the class with the default font settings and the specified font style.
Aspose.Tasks.Visualization.TextStyle.#ctor(System.Single,Aspose.Tasks.Visualization.FontStyles) Initializes a new instance of the class with the default font and specified font size and style.
Aspose.Tasks.Visualization.TextStyle.#ctor(Aspose.Tasks.Visualization.FontStyles) Initializes a new instance of the class with the default font and specified font style.
Aspose.Tasks.Visualization.TextStyle.#ctor(Aspose.Tasks.Visualization.FontDescriptor) Initializes a new instance of the class with the specified font settings.
Aspose.Tasks.Visualization.TextStyle.Font Gets or sets font of the text style.
Aspose.Tasks.WorkingTime.#ctor(System.TimeSpan,System.TimeSpan) Initializes a new instance of the class with an interval item with the specified start and finish times.
Aspose.Tasks.WorkingTime.#ctor(System.Int32,System.Int32) Initializes a new instance of the class with an interval item with the specified start and finish times.
Aspose.Tasks.WorkingTime.From Gets the beginning of a working time.
Aspose.Tasks.WorkingTime.To Gets the end of a working time.
The following public methods and properties were deleted: Description
The following public enumerations were added: Description
Aspose.Tasks.SummaryRowsCalculationType.None Means the custom attribute’s value for summary rows is not calculated.
Aspose.Tasks.SummaryRowsCalculationType.Rollup Means the custom attribute’s value for summary rows is calculated using rollup function defined in .
Aspose.Tasks.SummaryRowsCalculationType.UseFormula Means the custom attribute’s value for summary rows is calculated using formula defined in .
Aspose.Tasks.Visualization.FontStyles.Strikeout Text with a line through the middle.

.NET Framework 2.0 deprecation notice

Starting with ver. 22.9 (September 2022) Aspose.Tasks for .NET will no longer support .NET Framework 2.0.

Notes on support of .NET 6.0 in *nix environment

Related issue: TASKSNET-10429, Fix exception when opening MPP file in projects targeting .NET 6.0 in *nix environment

As a step in adding of support .NET 6.0 in *nix environment we are replacing property TextStyle.FontFamily (Type: System.Drawing.FontFamily) with property TextStyle.Font (Type: Aspose.Tasks.Visualization.FontDescriptor). The rendering (when project’s view is saved to a graphical format) is not supported at the moment because it relies on System.Drawing.Common. See [Microsoft post|https://docs.microsoft.com/en-us/dotnet/core/compatibility/core-libraries/6.0/system-drawing-common-windows-only] for more details.

Now CancellationToken can be specified to allow cancellation of long project loading operation (not applicable to versions for .NET Framework 2.0 and 3.5):

CancellationTokenSource cts = new CancellationTokenSource();

Project p = new Project("test.mpp", loadOptions);


Related issue: TASKSNET-10480 - Add an API to set user-specified callback which allows to substitute absent fonts when a project is rendered to a graphical format

The user can use any font to customize View’s text styles using MS Project. When the project is saved, the font information (actually a font name and size) is persisted to MPP file. Sometimes the resulting MPP file is opened on another environment where the specified font may be missing. To address this issue we introduced FontResolveCallback which can be used to intercept font resolving event. The callback is invoked when the project’s view is saved to a graphical format and the rendering engine resolves a font to render a text.

Project project = new Project("Input.mpp");
PdfSaveOptions so = new PdfSaveOptions();
so.PresentationFormat = PresentationFormat.GanttChart;
so.Timescale = Timescale.DefinedInView;
so.FontResolveCallback = delegate(FontResolveEventArgs args)
{
if (args.RequestedFontName  != args.ResolvedFontName)
{
// Looks like the exact font cannot be found and fallback font was resolved.
// We can override the fallback font.
args.ResolvedFontName = "Arial";
}

// Or simply substitute the specific font:
if (args.RequestedFontName == "Comic Sans MS")
{
args.ResolvedFontName = "Arial";
}
};

project.Save("Output.pdf", so);


Related issue: TASKSNET-2596 - Add support for “Calculation for task and group summary rows” custom field option

The API for Extended attributes were improved. The previous ExtendedAttributeDefinition API where ExtendedAttributeDefinition.CalculationType should be one of the following: { None, Lookup, Rollup, Calculation } didn’t reflect all the cases such as extended attribute where values for leaf tasks are calculated using formula and values of the summary tasks are calculated using rollup. ExtendedAttributeDefinition.SummaryRowsCalculationType property (with values None, Rollup, UseFormula) was added to reflect MS Project’s model of extended attribute’s settings. ExtendedAttributeDefinition.CalculationType’s values are now limited to (None, Lookup, Formula) values.

The following example creates an extended attribute which values for leaf tasks are calculated using formula and values for summary tasks are calculated using average rollup:

var project = new Project("Test.mpp");
definition.CalculationType = CalculationType.Formula;
definition.Formula = "[Cost] * 3.14";
definition.SummaryRowsCalculationType = SummaryRowsCalculationType.Rollup;
definition.RollupType = RollupType.Average;

project.Save("Output.mpp");


Related issue: TASKSNET-10496 - Make WorkingTime immutable

In order to optimize calendar-related calculations WorkingTime class was made immutable (so properties cannot be modified after object is created). Also 2 new overloads of constructor of WorkingTime class were added to allow less verbose creation of WorkingTime:

22.2 version:

WorkingTime wt = new WorkingTime(new DateTime(1, 1, 1, 9, 0, 0), new DateTime(1, 1, 1, 12, 0, 0));
WorkingTime wt2 = new WorkingTime(new DateTime(1, 1, 1, 9, 15, 0), new DateTime(1, 1, 1, 12, 15, 0));

22.3+ version:
WorkingTime wt = new WorkingTime(9, 12);
WorkingTime wt2 = new WorkingTime(new TimeSpan(9, 15, 0), new TimeSpan(12, 15, 0));