微软 Mads Torgersen《从C#看开放对编程语言发展的影响》（2）
自诞生以来，C#大部分时间都是微软的专有语言，仅支持Windows，只有Visual Studio一款IDE。不过时代已经变了。C#从设计到实现都已经开源，几乎能运行在各种平台上。编译器变成了开放API，可以实时理解和生成C#代码，可以支持任何我们喜欢的代码编辑器。这背后发生了什么呢？我们一起看看，对C#而言，开放到底意味着什么？
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4.Open source
Cross platform
Open language API “Roslyn”
Cross IDE
Open design
Open to change
“New direction” on the Great Wall
5.from c in customers customers
where c.City == "Beijing" .Where(c => c.City == "Beijing")
select c.Name; .Select(c => c.Name);
from c in customers customers
where c.City == "Beijing" .Where(c => c.City == "Beijing")
from o in c.Orders .SelectMany(c => c.Orders, (c, o) => new { c, o })
select (c.Name, o.Price); .Select(p => (p.c.Name, p.o.Price));
6.void PlaySongs(int[] ids)
{
foreach (var id in ids)
{
try
{
var data = service.GetEncodedData(id);
var song = Decode(data);
Play(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
7.Task PlaySongsAsync(int[] ids)
{
foreach (var id in ids)
{
try
{
var data = service.GetEncodedData(id);
var song = Decode(data);
Play(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
8.async Task PlaySongsAsync(int[] ids)
{
foreach (var id in ids)
{
try
{
var data = service.GetEncodedData(id);
var song = Decode(data);
Play(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
9.async Task PlaySongsAsync(int[] ids)
{
foreach (var id in ids)
{
try
{
var data = await service.GetEncodedDataAsync(id);
var song = Decode(data);
Play(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
10.async Task PlaySongsAsync(int[] ids)
{
foreach (var id in ids)
{
try
{
var data = await service.GetEncodedDataAsync(id);
var song = Decode(data);
await PlayAsync(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
11.async Task PlaySongsAsync(int[] ids)
{
foreach (var id in ids)
{
try
{
var data = await service.GetEncodedDataAsync(id);
var song = await Task.Run(() => Decode(data));
await PlayAsync(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
12.async Task PlaySongsAsync(int[] ids)
{
Task currentlyPlaying = Task.FromResult(true);
foreach (var id in ids)
{
try
{
var data = await service.GetEncodedDataAsync(id);
var song = await Task.Run(() => Decode(data));
await PlayAsync(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
13.async Task PlaySongsAsync(int[] ids)
{
Task currentlyPlaying = Task.FromResult(true);
foreach (var id in ids)
{
try
{
var data = await service.GetEncodedDataAsync(id);
var song = await Task.Run(() => Decode(data));
await currentlyPlaying;
currentlyPlaying = PlayAsync(song);
}
catch (Exception e) { /* just skip the song */ }
}
}
14.async Task PlaySongsAsync(int[] ids)
{
Task currentlyPlaying = Task.FromResult(true);
foreach (var id in ids)
{
try
{
var data = await service.GetEncodedDataAsync(id);
var song = await Task.Run(() => Decode(data));
await currentlyPlaying;
currentlyPlaying = PlayAsync(song);
}
catch (Exception e) { /* just skip the song */ }
}
try { await currentlyPlaying; } catch (Exception e) { }
}
15. Evolve...
a little a lot
Stagnation
C#
16. C# 7
C# 6 Work with
Eliminate data
C# 5 ceremony
C# 4 Async
Dynamic,
C# 3 Concurrency
Queries,
C# 2 Lambdas
C# 1 Generics
Hello World
17.East gate to Beihai Park
