PeachDrawing.Core

PeachDrawing.Core

RUri Class

Wraps System.Uri for use throughout resource loading, adding special-case handling for data: URIs and helpers for resolving a relative URI against a base URI.

public class RUri

Inheritance System.Object → RUri

Remarks

Before .NET 10, a data: URI is deliberately never handed to System.Uri. Two independent reasons, both measured on net8.0: it cannot round-trip one correctly through AbsoluteUri, and it rejects any URI string longer than 65,519 characters (“Invalid URI: The Uri string is too long.”). That ceiling is roughly 48 KB of payload once base64 expansion is accounted for, which real embedded logos, photographs and charts exceed routinely; the System.UriFormatException is caught upstream and turned into a skipped resource, so the only symptom is an image that silently renders blank. Holding the original string instead removes the ceiling.

On .NET 10 and later neither reason holds: System.Uri round-trips a data: URI exactly and has no length ceiling at all (measured: a 5,000,023-character payload constructs successfully). It also percent-escapes a non-base64 payload, which holding the raw string does not — data:text/plain,Hello World! comes back with the space escaped there and verbatim before .NET 10. So the bypass is gated: .NET 10 keeps using System.Uri, which is both correct and strictly better, and only the older targets take the string-holding path they actually need.