Learn collaborative editing in Blazor Diagram using SignalR and Redis. Implement real-time updates, optimistic concurrency, and scale out backplanes.

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SignalR and Redis enable real-time collaborative editing in Blazor Diagram by broadcasting delta payloads from HistoryChanged events through a SignalR hub. The implementation uses optimistic concurrency with version tracking (userVersion/serverVersion) to detect and reject conflicting edits. Redis serves as a backplane for scaling across multiple server instances, while SetDiagramUpdatesAsync applies remote changes. The approach includes conflict detection by tracking modified element IDs and rejecting stale updates when overlaps occur.

Collaborative Editing in Blazor Diagram Using SignalR and Redis

Setting up real-time collaboration in ASP.NET Core

Setting up the Blazor application for collaborative editing