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MILEFFECTSERR_EFFECTINMORETHANONEGRAPH
MILEFFECTSERR_EFFECTINMORETHANONEGRAPH identifies a failure in MIL effect graph ownership and membership. One effect instance is being owned by more than one effect graph. Investigation of this result should preserve the original object generation before cleanup, retry, or fallback creates a secondary result.
Subsystem boundary
An effect instance has identity and graph ownership. Group membership, insertion, and reuse are not value-copy operations: adding the same live node twice or attaching it to another graph changes ownership semantics even if the effect parameters are identical., reconstruct the graph by object identity, not by display names or serialized settings.
Inspect the following boundary: single-graph ownership and attempted reuse of a live node.
Facts worth preserving
| Record | Why it matters here |
|---|---|
| Effect instance and owning graph or group identity | Preserving effect instance and owning graph or group identity provides the evidence needed to test this distinction: eFFECTALREADYINAGRAPH may refer to re-adding inside the same graph; this result explicitly concerns multiple graphs. |
| Connector, input, child, listener, property, or transform involved | Recording connector, input, child, listener, property, or transform involved separates the MIL effect graph ownership and membership boundary from a later wrapper symptom. |
| Calculated input and output bounds | In this result diagnostics, recording calculated input and output bounds ties the HRESULT to the MIL effect graph ownership and membership boundary rather than to the final visible failure. |
| Construction sequence and first method returning the HRESULT | Comparing construction sequence and first method returning the HRESULT shows whether this result follows input, object state, or environment. |
What each result would imply
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If it disappears with a smaller faithful case, complexity within MIL effect graph ownership and membership is implicated. | Keep effect instance and owning graph or group identity fixed while simplifying calculated input and output bounds. |
| Same input, fresh object generation | If it changes after rebuilding state, examine ownership across the effect instance, connector builder, graph owner, listener, and bounds calculator. | Place connector, input, child, listener, property, or transform involved on the timeline of the last successful transition. |
| Same operation on a controlled second path | If it follows one environment, the failure is not explained by source data alone. | Compare visual generation, effect registration, shader profile, rendering tier, and target dimensions while preserving construction sequence and first method returning the HRESULT. |
Isolation procedure
When it is returned, create fresh effect instances for each graph and log every add, remove, group, and dispose operation. Then test deliberate duplicate insertion as a negative control so cleanup code cannot silently mask ownership mistakes.
- Clone or recreate the effect for the second graph instead of sharing the same mutable instance.
- rebuild the smallest graph containing only the implicated node and one known input.
- When it is returned, log ownership changes and graph generation numbers.
- Validate the graph before allocating large intermediate resources.
Do not hide the original condition
EFFECTALREADYINAGRAPH may refer to re-adding inside the same graph; it explicitly concerns multiple graphs. Do not catch the HRESULT and continue rendering with a partially connected graph; later failures can obscure the invariant that was first violated.
Verification after repair
A correction for it should let the operation at the MIL effect graph ownership and membership boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Clone or recreate the effect for the second graph instead of sharing the same mutable instance” and confirm that the following lifecycle step also succeeds. Keep the original failing sample and one deliberate negative case so fallback cannot be mistaken for repair.
Technical references
When it is returned, these references define the public API family, object model, or error list used to interpret this status.
- Microsoft Open Specifications: HRESULT values.
- Microsoft: WPF bitmap effects overview.
- Microsoft: PixelShader class.
- Microsoft: Direct2D custom effects.
- Microsoft: ID2D1TransformGraph.
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