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#hashtag@speaker C# 6 - do it right Vedran Kaldi Senior Developer @Five
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No big new concepts Many small features Clean up your code C# v6 design philosophy
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Visual Studio 2015 CTP 5 File -> New -> Project How to use today?
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Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json["x"] != null && json["x"].Type == JTokenType.Integer && json["y"] != null && json["y"].Type == JTokenType.Integer) { return new Point((int)json["x"], (int)json["y"]); } return null; }
![Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json[ x ] != null && json[ x ].Type == JTokenType.Integer && json[ y ] != null && json[ y ].Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; }](http://images.slideplayer.com./28/9416879/slides/slide_4.jpg "Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json[ x ] != null && json[ x ].Type == JTokenType.Integer && json[ y ] != null && json[ y ].Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; }")
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Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json["x"]?.Type == JTokenType.Integer && json["y"]?.Type == JTokenType.Integer) { return new Point((int)json["x"], (int)json["y"]); } return null; } ?.?.
![Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json[ x ] .Type == JTokenType.Integer && json[ y ] .Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; } . .](http://images.slideplayer.com./28/9416879/slides/slide_5.jpg "Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json[ x ] .Type == JTokenType.Integer && json[ y ] .Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; } . .")
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Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json["x"]?.Type == JTokenType.Integer && json["y"]?.Type == JTokenType.Integer) { return new Point((int)json["x"], (int)json["y"]); } return null; }
![Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json[ x ] .Type == JTokenType.Integer && json[ y ] .Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; }](http://images.slideplayer.com./28/9416879/slides/slide_6.jpg "Null-conditional operators public static Point FromJson(JObject json) { if (json != null && json[ x ] .Type == JTokenType.Integer && json[ y ] .Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; }")
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Null-conditional operators public static Point FromJson(JObject json) { if (json?["x"]?.Type == JTokenType.Integer && json?["y"]?.Type == JTokenType.Integer) { return new Point((int)json["x"], (int)json["y"]); } return null; }
![Null-conditional operators public static Point FromJson(JObject json) { if (json [ x ] .Type == JTokenType.Integer && json [ y ] .Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; }](http://images.slideplayer.com./28/9416879/slides/slide_7.jpg "Null-conditional operators public static Point FromJson(JObject json) { if (json [ x ] .Type == JTokenType.Integer && json [ y ] .Type == JTokenType.Integer) { return new Point((int)json[ x ], (int)json[ y ]); } return null; }")
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Null-conditional operators OnChanged(this, args);
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Null-conditional operators if (OnChanged != null) { OnChanged(this, args); }
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Null-conditional operators { var onChanged = OnChanged; if (onChanged != null) { onChanged(this, args); }
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Null-conditional operators OnChanged?.Invoke(this, args);
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String interpolation using System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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String interpolation using System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Sqrt(X * X + Y * Y); } } public override string ToString() { return $"({X}, {Y})"; }
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Expression-bodied methods using System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Sqrt(X * X + Y * Y); } } public override string ToString() { return $"({X}, {Y})"; }
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Expression-bodied methods using System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Sqrt(X * X + Y * Y); } } public override string ToString() { return $"({X}, {Y})"; } () => { return $"({X}, {Y})"; } () => $"({X}, {Y})"
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Expression-bodied methods using System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Sqrt(X * X + Y * Y); } } public override string ToString() => $"({X}, {Y})"; }
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Expression-bodied properties using static System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Sqrt(X * X + Y * Y); } } public override string ToString() => $"({X}, {Y})"; }
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Expression-bodied properties using static System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist => Sqrt(X * X + Y * Y); public override string ToString() => $"({X}, {Y})"; }
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Expression-bodied properties using static System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist => Sqrt(X * X + Y * Y); public override string ToString() => $"({X}, {Y})"; }
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The nameof operator public Point Add(Point point) { if (point == null) { throw new ArgumentNullException("point"); }
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The nameof operator public Point Add(Point other) { if (other == null) { throw new ArgumentNullException("point"); }
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The nameof operator public Point Add(Point point) { if (point == null) { throw new ArgumentNullException(nameof(point)); }
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The nameof operator public Point Add(Point other) { if (other == null) { throw new ArgumentNullException(nameof(other)); }
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Exception filters try { … } catch (ArgumentException e) { } finally { }
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Exception filters try { … } catch (ArgumentException e) if (e.ParamName == nameof(other)) { } finally { }
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Exception filters try { … } catch (ArgumentException e) if (e.ParamName == nameof(other)) { } catch (ArgumentException e) if (e.ParamName == nameof(param2)) { } finally { }
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Getter-only auto-properties public class Point { public int X { get; set; } public int Y { get; set; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Math.Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Getter-only auto-properties public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Math.Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Getter-only auto-properties public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; // samo u konstruktoru!!! } public double Dist { get { return Math.Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Getter-only auto-properties public class Point { public int X { get; } // Pitanje: kako ovo trenutno riješavamo? public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Math.Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Getter-only auto-properties public class Point { public int X { get; private set; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Math.Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Initializers for auto-properties public class Point { public int X { get; } = 5; public int Y { get; } = 7; public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Math.Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Using static classes public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Math.Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Using static classes using static System.Math; public class Point { public int X { get; } public int Y { get; } public Point(int x, int y) { X = x; Y = y; } public double Dist { get { return Sqrt(X * X + Y * Y); } } public override string ToString() { return String.Format("({0}, {1})", X, Y); }
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Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { var result = new Dictionary (); result["x"] = X; result["y"] = Y; return result; }
![Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { var result = new Dictionary (); result[ x ] = X; result[ y ] = Y; return result; }](http://images.slideplayer.com./28/9416879/slides/slide_35.jpg "Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { var result = new Dictionary (); result[ x ] = X; result[ y ] = Y; return result; }")
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Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { var result = new Dictionary () { ["x"] = X, ["y"] = Y }; return result; }
![Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { var result = new Dictionary () { [ x ] = X, [ y ] = Y }; return result; }](http://images.slideplayer.com./28/9416879/slides/slide_36.jpg "Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { var result = new Dictionary () { [ x ] = X, [ y ] = Y }; return result; }")
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Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { return new Dictionary () { ["x"] = X, ["y"] = Y }; }
![Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { return new Dictionary () { [ x ] = X, [ y ] = Y }; }](http://images.slideplayer.com./28/9416879/slides/slide_37.jpg "Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() { return new Dictionary () { [ x ] = X, [ y ] = Y }; }")
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Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() => new Dictionary () { ["x"] = X, ["y"] = Y }; }
![Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() => new Dictionary () { [ x ] = X, [ y ] = Y }; }](http://images.slideplayer.com./28/9416879/slides/slide_38.jpg "Index initializers public class Point { public int X { get; } public int Y { get; } … public Dictionary ToJson() => new Dictionary () { [ x ] = X, [ y ] = Y }; }")
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Await in catch and finally try { … } catch (ConfigurationException e) if (e.IsSevere) { await LogAsync(e); } finally { await CloseAsync(); }
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https://github.com/dotnet/roslyn https://github.com/dotnet/roslyn/wiki/Languages-features- in-C%23-6-and-VB-14 Learn more at …
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