The document discusses new features in C# 7.0 including tuples, pattern matching, out variables, and more. It provides code examples demonstrating how to use tuples to return multiple values from functions, type patterns to match types in switch statements, and when conditions to add additional checks to case statements. The examples show enhanced control flow options in C# with these new features.

1. Mini 

17. 61%YoY Growth .NET Active Developers
(VS 2012+)
40%.NET Core downloads by new developers 62% GitHub contributions from outside of Microsoft
(corefx / coreclr repos)
0
100
200
300
400
500
600
700
800
900
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Qtr1 Qtr2 Qtr3 Qtr4 Qtr1 Qtr2 Qtr3 Qtr4 Qtr1 Qtr2 Qtr3
2014 2015 2016
Community PRs by month

18. .NET in 2015

19. .NET in 2016

21. .NET STANDARD LIBRARY

22. .NET STANDARD LIBRARY

24. .NET STANDARD LIBRARY

26. Plain Text Request Per Second

27. https://www.techempower.com/benchmarks

31. http://example.com https://example.com

32. http://example.com https://example.com

33. @await Component.InvokeAsync("Copyright", new { website = "example.com", year = 2016 })

34. <vc:copyright website=“example.com” year>< vc:copyright>

35. http://example.com https://example.com

38. • Use the current release to get the latest features
• Supported as long as you keep updating to the latest
• Use the Long Term Support release as the most stable platform
• LTS is fully supported for 3 years and receives regular important updates
• You can mix and match your strategy (even in the same machine!)
Current (1.1)
Long Term
Support (LTS)
1.0

39. .NET STANDARD LIBRARY

40. .NET STANDARD LIBRARY

42. Primitives • Collections • Reflection • Interop • LinqCORE
Threads • Thread Pool • TasksTHREADING
Files • Compression • MMFIO
Sockets • Http • Mail • WebSocketsNETWORKING
BinaryFormatter • Data Contract • XMLSERILIZATION
XLinq • XML Document • XPath • Schema • XSLXML

43. MY
.NET FRAMEWORK
APP
MY STANDARD LIBRARY
MY
.NET CORE
APP
MY
XAMARIN
APP

47. Create
Cluster

51. Build/CI,
Integrate,
Test
Monitor and Diagnose
Production
environments
Run, Manage
Container Service
Service Fabric
Batch
App Services
coming soon
…
…
Azure
Container
Registry
Code
Run
Validate
Debug
Inner-Loop
CD, Deploy
Source Code
Control
(SCC)

52. Public Preview
• November
GA
• Spring ‘17
aka.ms/AzureContainerRegistry

54. Bot Framework
Your bots – wherever your users are
talking.
Build and connect intelligent bots to interact
with your users naturally wherever they are,
from text/SMS to Skype, Slack, Messenger,
Office 365 mail and other popular services.

55. Channel
support
Direct
Line support
Cognitive
Services
Embedded
web chat
API

56. https://channel9.msdn.com/Events/Connect/2016

59. int[] numbers =
{ 1, 2, 4, 8, 16, 32 };

60. int[] numbers =
{ 0b1, 2, 4, 8, 16, 32 };

61. int[] numbers =
{ 0b1, 0b10, 4, 8, 16, 32 };

62. int[] numbers =
{ 0b1, 0b10, 0b100, 8, 16, 32 };

63. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 16, 32 };

64. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b10000, 32 };

65. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 32 };

66. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 3_2 };

67. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 3_______2 };

68. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b100000 };

69. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };

70. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };

71. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);

72. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
(int, int) Tally(int[] values)
{
}

73. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
(int, int) Tally(int[] values)
{
var r = (0, 0);
return r;
}

74. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
WriteLine($"Sum: {t.Item1}, count: {t.Item2}");
(int, int) Tally(int[] values)
{
var r = (0, 0);
return r;
}

75. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
WriteLine($"Sum: {t.Item1}, count: {t.Item2}");
(int sum, int count) Tally(int[] values)
{
var r = (0, 0);
return r;
}

76. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
WriteLine($"Sum: {t.sum}, count: {t.count}");
(int sum, int count) Tally(int[] values)
{
var r = (0, 0);
return r;
}

77. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
WriteLine($"Sum: {t.sum}, count: {t.count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
return r;
}

78. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {t.sum}, count: {t.count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
return r;
}

79. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
return r;
}

80. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
return r;
}

81. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
foreach (var v in values)
{
}
return r;
}

82. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
foreach (var v in values)
{
r = (r.s + v, r.c + 1);
}
return r;
}

83. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
foreach (var v in values)
{
r.s += v;
}
return r;
}

84. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
foreach (var v in values)
{
r.s += v; r.c++;
}
return r;
}

85. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
foreach (var v in values)
{
r.s += v; r.c++;
}
return r;
}

86. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
foreach (var v in values)
{
Add(v, 1);
}
return r;
}

87. int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var (sum, count) = Tally(numbers);
WriteLine($"Sum: {sum}, count: {count}");
(int sum, int count) Tally(int[] values)
{
var r = (s:0, c:0);
foreach (var v in values)
{
Add(v, 1);
}
return r;
void Add(int s, int c) { r.s += s; r.c += c; }
}

88. public void PrintStars(object o)
{
}

89. public void PrintStars(object o)
{
if (o is null) return; // constant pattern "null"
}

90. public void PrintStars(object o)
{
if (o is null) return; // constant pattern "null"
if (!(o is int i)) return; // type pattern "int i"
}

91. public void PrintStars(object o)
{
if (o is null) return; // constant pattern "null"
if (!(o is int i)) return; // type pattern "int i"
WriteLine(new string('*', i));
}

92. switch (shape) // Switch on anything
{
}

93. switch (shape) // Switch on anything
{
default:
WriteLine("<unknown shape>");
break;
}

94. switch (shape) // Switch on anything
{
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>");
break;
}

95. switch (shape) // Switch on anything
{
case Circle c: // Type pattern
break;
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>");
break;
}

96. switch (shape) // Switch on anything
{
case Circle c: // Type pattern
WriteLine($"circle with radius {c.Radius}"); // use c
break;
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>");
break;
}

97. switch (shape) // Switch on anything
{
case Rectangle r:
WriteLine($"{r.Length} x {r.Height} rectangle");
break;
case Circle c: // Type pattern
WriteLine($"circle with radius {c.Radius}"); // use c
break;
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>");
break;
}

98. switch (shape) // Switch on anything
{
case Rectangle s when (s.Length == s.Height): // when-condition
WriteLine($"{s.Length} x {s.Height} square");
break;
case Rectangle r:
WriteLine($"{r.Length} x {r.Height} rectangle");
break;
case Circle c: // Type pattern
WriteLine($"circle with radius {c.Radius}"); // use c
break;
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>");
break;
}

99. blogs.msdn.microsoft.com/dotnet/
2016/08/24/whats-new-in-csharp-7-0/