[API Proposal]: Add `EventSourceEventGenerateAttribute` to generate event code

[Cricle]

Background and motivation

According to eventsource-getting-started

Eventone must call like WriteEvent or WriteEventCore to write event.

But this is a regular code.

API Proposal

No any changed, but the partial base on EventSource class, partial method and has EventAttribute method will be generated.

API Usage

internal sealed unsafe /*It's mandatory or in method write unsafe*/ partial class RuntimeEventSource : EventSource
{
    [Event(1)]
    public partial void GoHome(string address,double usedTime);
}


//Will generated
public void GoHome(string address,double usedTime)
{
    address ??= System.String.Empty;
    global::System.Diagnostics.Tracing.EventSource.EventData* datas = stackalloc global::System.Diagnostics.Tracing.EventSource.EventData[2];

    fixed(char* addressPtr = address)
    {
        datas[0] = new global::System.Diagnostics.Tracing.EventSource.EventData
        {
            DataPointer = addressPtr,
            Size = (address.Length + 1) * sizeof(char)
        };
        datas[1] = new global::System.Diagnostics.Tracing.EventSource.EventData
        {
            DataPointer = (nint)(&usedTime),
            Size = sizeof(double)
        };     
        WriteEventWithRelatedActivityIdCore(1, null, 2, datas);
    }
}

Alternative Designs

No

Risks

No

[julealgon]

ActivitySource is mentioned in the title but not in the post. Can you elaborate what the benefits would be for that?

[Cricle]

ActivitySource is mentioned in the title but not in the post. Can you elaborate what the benefits would be for that?

Oh！I forgot write that 😱

[tommcdon]

Hi @Cricle! Some source generator work has been done on EventSource, for example #45699. Remaining work is tracked on #56154. Our team does not have immediate plans to work on this - please do feel free to submit a PR if you plan on working on it as we welcome community contributions!