Override Span and Memory Writes for HttpResponseStreamWriter

[benaadams]

For netcoreapp2.1

Also WriteLine and WriteLineAsync as the default implementations on TextWriter are not great

[analogrelay]

Putting this on the backlog for now, 3.0 is pretty fully booked.

[analogrelay]

We should, in general, get all the async methods overridden so they don't unintentionally cause issues with the sync I/O blocking code.

See #16740.

Let's look at this in 5.0.0-preview1

[alefranz]

Hello, any chance you can provide more details on what you are looking for, so I can see if it is something I can try to contribute?

Thank you!

[benaadams]

HttpResponseStreamWriter doesn't implement all the virtual methods of TextWriter

In particular

public virtual void Write(ReadOnlySpan<char> buffer);
public virtual Task WriteAsync(ReadOnlyMemory<char> buffer, CancellationToken cancellationToken = default(CancellationToken));
public virtual void WriteLine(ReadOnlySpan<char> buffer);
public virtual Task WriteLineAsync(ReadOnlyMemory<char> buffer, CancellationToken cancellationToken = default(CancellationToken));

[alefranz]

Thanks Ben for the quick reply! I'll have a look.

[alefranz]

@benaadams I've started with the easy one and opened #18445 to make sure I'm not missing the point.
I'll then have a look at the async ones.