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It's included as internal on netstandard/net472, and the C# compiler may bake a reference to that into a consumer. If that consumer is then used with a net8.0+ build, the IsExternalInit needs to be there and forwarded to the real one.

This switches our polyfill files to always be included but the actual contents ifdef'd out on TFMs that already have the contents. That then makes it easier to do specialized ifdef'ing in the future, as this does for IsExternalInit.

It's included as internal on netstandard/net472, and the C# compiler may bake a reference to that into a consumer. If that consumer is then used with a net8.0+ build, the IsExternalInit needs to be there and forwarded to the real one.

This switches our polyfill files to always be included but the actual contents ifdef'd out on TFMs that already have the contents. That then makes it easier to do specialized ifdef'ing in the future, as this does for IsExternalInit.
@stephentoub stephentoub merged commit 5f1c74f into modelcontextprotocol:main Jul 14, 2025
24 of 28 checks passed
@stephentoub stephentoub deleted the fwdinit branch July 14, 2025 14:30
microsoft-github-policy-service bot pushed a commit to Azure/bicep that referenced this pull request Aug 25, 2025
…7897)

Updated
[ModelContextProtocol](https://github.com/modelcontextprotocol/csharp-sdk)
from 0.3.0-preview.2 to 0.3.0-preview.4.

<details>
<summary>Release notes</summary>

_Sourced from [ModelContextProtocol's
releases](https://github.com/modelcontextprotocol/csharp-sdk/releases)._

## 0.3.0-preview.4

## What's Changed
* Respect HandleResponse() and SkipHandler() calls in
OnResourceMetadataRequest by @​halter73 in
modelcontextprotocol/csharp-sdk#607
* UnreferenceDisposable made slimmer by @​Scooletz in
modelcontextprotocol/csharp-sdk#627
* IdleTracking uses lists instead of SortedSet by @​Scooletz in
modelcontextprotocol/csharp-sdk#629
* Fix ResourceLinkBlock deserialization by adding missing "name" case by
@​Copilot in modelcontextprotocol/csharp-sdk#645
* Add an in-memory transport sample by @​stephentoub in
modelcontextprotocol/csharp-sdk#664
* Remove 'Sse' from AspNetCoreSseServer sample name by @​halter73 in
modelcontextprotocol/csharp-sdk#665
* Fix NotSupportedException when returning IEnumerable<ContentBlock> by
@​Copilot in modelcontextprotocol/csharp-sdk#675
* Enhance HTTP and MCP session logging by @​theojiang25 in
modelcontextprotocol/csharp-sdk#608
* Remove special-casing of string enumerables in McpServerTool by
@​stephentoub in
modelcontextprotocol/csharp-sdk#699
* Prune idle sessions before starting new ones by @​halter73 in
modelcontextprotocol/csharp-sdk#701
* Add framework for conceptual docs by @​mikekistler in
modelcontextprotocol/csharp-sdk#708

## New Contributors
* @​Scooletz made their first contribution in
modelcontextprotocol/csharp-sdk#627
* @​Copilot made their first contribution in
modelcontextprotocol/csharp-sdk#645
* @​theojiang25 made their first contribution in
modelcontextprotocol/csharp-sdk#608

**Full Changelog**:
modelcontextprotocol/csharp-sdk@v0.3.0-preview.3...v0.3.0-preview.4

## 0.3.0-preview.3

## What's Changed
* Enable netfx testing. by @​eiriktsarpalis in
modelcontextprotocol/csharp-sdk#588
* fix: Prevent crash when Options.ResourceMetadata is null but handled
by event by @​DavidParks8 in
modelcontextprotocol/csharp-sdk#603
* Update to M.E.AI 9.7.0 by @​stephentoub in
modelcontextprotocol/csharp-sdk#602
* Ensure IsExternalInit is type forwarded on NET builds by @​stephentoub
in modelcontextprotocol/csharp-sdk#619
* Flow ExecutionContext with JsonRpcMessage by @​halter73 in
modelcontextprotocol/csharp-sdk#616
* Update MEAI version and add regression test for #​601. by
@​eiriktsarpalis in
modelcontextprotocol/csharp-sdk#628

## New Contributors
* @​DavidParks8 made their first contribution in
modelcontextprotocol/csharp-sdk#603

**Full Changelog**:
modelcontextprotocol/csharp-sdk@v0.3.0-preview.2...v0.3.0-preview.3

Commits viewable in [compare
view](modelcontextprotocol/csharp-sdk@v0.3.0-preview.2...v0.3.0-preview.4).
</details>

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ouvreboite pushed a commit to ouvreboite/csharp-sdk that referenced this pull request Aug 26, 2025
…otocol#619)

It's included as internal on netstandard/net472, and the C# compiler may bake a reference to that into a consumer. If that consumer is then used with a net8.0+ build, the IsExternalInit needs to be there and forwarded to the real one.

This switches our polyfill files to always be included but the actual contents ifdef'd out on TFMs that already have the contents. That then makes it easier to do specialized ifdef'ing in the future, as this does for IsExternalInit.
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