[OpenApi] SourceGen on preview version: Property or indexer 'IOpenApiParameter.Example' cannot be assigned to

[erwinkramer]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I'm getting the following errors during build:

Property or indexer 'IOpenApiParameter.Example' cannot be assigned to -- it is read only [c:\Users\...\bank-api\BankApi.Service.Beta\BankApi.Service.Beta.csproj]
Property or indexer 'IOpenApiParameter.Deprecated' cannot be assigned to -- it is read only [c:\Users\...\bank-api\BankApi.Service.Beta\BankApi.Service.Beta.csproj]

Using:

    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview.17" />

Expected Behavior

Should build

Steps To Reproduce

Please use the branch related to erwinkramer/bank-api#6

Exceptions (if any)

Full ref:

[{
	"resource": "/c:/Users/../bank-api/BankApi.Service.Beta/obj/Debug/net10.0/Microsoft.AspNetCore.OpenApi.SourceGenerators/Microsoft.AspNetCore.OpenApi.SourceGenerators.XmlCommentGenerator/OpenApiXmlCommentSupport.generated.cs",
	"owner": "csharp-build",
	"code": "CS0200",
	"severity": 8,
	"message": "Property or indexer 'IOpenApiParameter.Example' cannot be assigned to -- it is read only [c:\\Users\\..\\bank-api\\BankApi.Service.Beta\\BankApi.Service.Beta.csproj]",
	"startLineNumber": 249,
	"startColumn": 33,
	"endLineNumber": 249,
	"endColumn": 33
},{
	"resource": "/c:/Users/../bank-api/BankApi.Service.Beta/obj/Debug/net10.0/Microsoft.AspNetCore.OpenApi.SourceGenerators/Microsoft.AspNetCore.OpenApi.SourceGenerators.XmlCommentGenerator/OpenApiXmlCommentSupport.generated.cs",
	"owner": "csharp-build",
	"code": "CS0200",
	"severity": 8,
	"message": "Property or indexer 'IOpenApiParameter.Deprecated' cannot be assigned to -- it is read only [c:\\Users\\..\\bank-api\\BankApi.Service.Beta\\BankApi.Service.Beta.csproj]",
	"startLineNumber": 251,
	"startColumn": 29,
	"endLineNumber": 251,
	"endColumn": 29
}]

.NET Version

10.0.100-preview.3.25201.16

Anything else?

No response

[martincostello]

Unfortunately there are many build breaks in OpenAPI.NET that mean you can't use versions newer than preview.3 was compiled with (preview.11) as it causes lots of fun issues, like the one you've found.

If you wait until preview.4 ships, that was compiled against preview.17, then it should work once any code of your own affected by same the changes in that library are made.

[martincostello]

See here for some more context: #61675

[erwinkramer]

Thanks @martincostello, good to hear that the next preview ships with preview.17 .

[erwinkramer]

Well that was fast, just got Preview 4 and now it's solved.