Console.Write prints a new line on iOS

[rolfbjarne]

Example:

Console.Write ("A");
Console.Write ("B");
Console.WriteLine ("C");

Output with .NET 5:

2020-05-14 12:50:56.386845+0200 MySingleView[89908:5086139] A
2020-05-14 12:50:56.386961+0200 MySingleView[89908:5086139] B
2020-05-14 12:50:56.387585+0200 MySingleView[89908:5086139] C

Output with current Xamarin.iOS:

2020-05-14 12:53:03.497594+0200 testapp[93230:5096504] ABC

The problem seems to be that mono's implementation stores text until a newline is written:

https://github.com/mono/mono/blob/f24a85069b3541ef45c8bbbd800ec7d88ad22e07/mcs/class/corlib/System/Console.iOS.cs#L81-L83

while dotnet's implementation writes out the text every time:

runtime/src/libraries/System.Console/src/System/ConsolePal.iOS.cs

Lines 16 to 24 in 622341e

	public override unsafe void Write(byte[] buffer, int offset, int count)
	{
	ValidateWrite(buffer, offset, count);
	fixed (byte* ptr = buffer)
	{
	Interop.Sys.Log(ptr + offset, count);
	}
	}

and NSLog will append a newline if the text doesn't have one.

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[stephentoub]

cc: @EgorBo

[EgorBo]

I forgot to file an issue for that because wanted to unblock Console for both Android (it has the same issue obviously) and iOS to print at least something for tests/development purposes.

[adamsitnik]

I've added 5.0.0 milestone as there is a PR (#37078) that should solve this issue.