1. New Features in C# 7.0 Mads Torgersen C# Program Manager

2. Binary literals int[] numbers = { 1, 2, 4, 8, 16, 32 };
9/19/2018 7:11 PM
Binary literals
int[] numbers =
{ 1, 2, 4, 8, 16, 32 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

3. Binary literals int[] numbers = { 0b1, 2, 4, 8, 16, 32 };
9/19/2018 7:11 PM
Binary literals
int[] numbers =
{ 0b1, 2, 4, 8, 16, 32 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

4. Binary literals int[] numbers = { 0b1, 0b10, 4, 8, 16, 32 };
9/19/2018 7:11 PM
Binary literals
int[] numbers =
{ 0b1, 0b10, 4, 8, 16, 32 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

5. Binary literals int[] numbers = { 0b1, 0b10, 0b100, 8, 16, 32 };
9/19/2018 7:11 PM
Binary literals
int[] numbers =
{ 0b1, 0b10, 0b100, 8, 16, 32 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

6. Binary literals int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 16, 32 };
9/19/2018 7:11 PM
Binary literals
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 16, 32 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

7. Binary literals int[] numbers =
9/19/2018 7:11 PM
Binary literals
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b10000, 32 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

8. Digit separators int[] numbers =
9/19/2018 7:11 PM
Digit separators
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 32 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

9. Digit separators int[] numbers =
9/19/2018 7:11 PM
Digit separators
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 3_2 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

10. Digit separators int[] numbers =
9/19/2018 7:11 PM
Digit separators
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 3_______2 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

11. Digit separators int[] numbers =
9/19/2018 7:11 PM
Digit separators
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

12. Digit separators int[] numbers =
9/19/2018 7:11 PM
Digit separators
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

13. 9/19/2018 7:11 PM
Tuples
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

14. 9/19/2018 7:11 PM
Tuples
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

15. 9/19/2018 7:11 PM
Tuples
int[] numbers =
{ 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 0b10_0000 };
var t = Tally(numbers);
(int, int) Tally(int[] values) { }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

16. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

17. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

18. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

19. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

20. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

21. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

22. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

23. 9/19/2018 7:11 PM
Tuples
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

24. 9/19/2018 7:11 PM
Tuples
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;
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

25. 9/19/2018 7:11 PM
Tuples
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;
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

26. 9/19/2018 7:11 PM
Tuples
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;
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

27. 9/19/2018 7:11 PM
Tuples
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;
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

28. Local functions int[] numbers =
9/19/2018 7:11 PM
Local functions
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;
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

29. Local functions int[] numbers =
9/19/2018 7:11 PM
Local functions
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;
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

30. Local functions int[] numbers =
9/19/2018 7:11 PM
Local functions
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; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

31. Pattern matching public void PrintStars(object o) { }
9/19/2018 7:11 PM
Pattern matching
public void PrintStars(object o) { }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

32. Pattern matching public void PrintStars(object o) {
9/19/2018 7:11 PM
Pattern matching
public void PrintStars(object o) {
if (o is null) return; // constant pattern "null" }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

33. Pattern matching public void PrintStars(object o) {
9/19/2018 7:11 PM
Pattern matching
public void PrintStars(object o) {
if (o is null) return; // constant pattern "null"
if (!(o is int i)) return; // type pattern "int i" }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

34. Pattern matching public void PrintStars(object o) {
9/19/2018 7:11 PM
Pattern matching
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)); }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

35. Pattern matching switch (shape) // Switch on anything { }
9/19/2018 7:11 PM
Pattern matching
switch (shape) // Switch on anything { }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

36. Pattern matching switch (shape) // Switch on anything { default:
9/19/2018 7:11 PM
Pattern matching
switch (shape) // Switch on anything {
default:
WriteLine("<unknown shape>");
break; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

37. Pattern matching switch (shape) // Switch on anything { case null:
9/19/2018 7:11 PM
Pattern matching
switch (shape) // Switch on anything {
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>");
break; }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

38. Pattern matching switch (shape) // Switch on anything {
9/19/2018 7:11 PM
Pattern matching
switch (shape) // Switch on anything {
case Circle c: // Type pattern
break;
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>"); }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

39. Pattern matching switch (shape) // Switch on anything {
9/19/2018 7:11 PM
Pattern matching
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>"); }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

40. Pattern matching switch (shape) // Switch on anything {
9/19/2018 7:11 PM
Pattern matching
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
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>"); }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

41. Pattern matching switch (shape) // Switch on anything {
9/19/2018 7:11 PM
Pattern matching
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");
case Circle c: // Type pattern
WriteLine($"circle with radius {c.Radius}"); // use c
case null:
throw new ArgumentNullException(nameof(shape));
default:
WriteLine("<unknown shape>"); }
© 2016 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

42. What you’ve seen Binary literals and digit separators Tuples
Local functions
Pattern matching
More at:
blogs.msdn.microsoft.com/dotnet/ /08/24/whats-new-in-csharp-7-0/