Diagram.Core

Diagram.Core provides the fundamental building blocks for StockSharp's visual strategy designer. It contains the classes that allow trading algorithms to be represented as diagrams and executed as regular strategies.

Overview

• Diagram Elements and Sockets — base types such as DiagramElement and DiagramSocket define nodes and their connection points. Elements can emit and receive values to build complex trading logic.
• Composite Elements — CompositionDiagramElement manages nested diagrams and exposes parameters and sockets of child elements.
• Strategy Integration — DiagramStrategy runs a diagram as a regular Strategy, enabling optimization and backtesting.
• Undo/Redo Support — interfaces like IUndoManager provide transaction based change tracking.
• External Code — the DiagramExternalAttribute allows methods to be exposed as diagram elements. A small helper script (python/designer_extensions.py) makes this available in Python.

Getting Started

1. Reference StockSharp.Diagram.Core from your project (via the StockSharp NuGet feed or by adding the project to your solution).
2. Create diagram elements by deriving from DiagramElement and define sockets and parameters.
3. Combine elements inside a CompositionDiagramElement or execute them through DiagramStrategy.

Example of exposing a Python function as an external element:

import clr
clr.AddReference("StockSharp.Diagram.Core")
from StockSharp.Diagram import DiagramExternalAttribute

# Decorator to mark methods as external diagram elements
def diagram_external(func):
    func.__dict__['__diagram_external__'] = DiagramExternalAttribute()
    return func

The above decorator adds the DiagramExternalAttribute to Python functions so they can be used in the Designer.