这是indexloc提供的服务，不要输入任何密码
Skip to content
This repository was archived by the owner on Jan 14, 2025. It is now read-only.

Migrate explore C# 8 to try-samples repo #7

Merged
merged 1 commit into from
Jun 21, 2019
Merged

Migrate explore C# 8 to try-samples repo #7

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
35 changes: 35 additions & 0 deletions csharp8/ExploreCsharpEight/AsyncStreams.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace ExploreCsharpEight
{
class AsyncStreams
{
#region AsyncStreams_Declare
internal async IAsyncEnumerable<int> GenerateSequence()
{
for (int i = 0; i < 20; i++)
{
// every 3 elements, wait 2 seconds:
if (i % 3 == 0)
await Task.Delay(3000);
yield return i;
}
}
#endregion

internal async Task<int> ConsumeStream()
{
#region AsyncStreams_Consume
await foreach (var number in GenerateSequence())
{
Console.WriteLine($"The time is {DateTime.Now:hh:mm:ss}. Retrieved {number}");
}
#endregion

return 0;
}

}
}
14 changes: 14 additions & 0 deletions csharp8/ExploreCsharpEight/ExploreCsharpEight.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp3.0</TargetFramework>
<LangVersion>8.0</LangVersion>
</PropertyGroup>

<ItemGroup>
<PackageReference Include="System.CommandLine.DragonFruit" Version="0.2.0-alpha.19174.3" />
<PackageReference Include="System.CommandLine.Experimental" Version="0.2.0-alpha.19174.3" />
</ItemGroup>

</Project>
29 changes: 29 additions & 0 deletions csharp8/ExploreCsharpEight/ExternalSystems.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
namespace ConsumerVehicleRegistration
{
public class Car
{
public int Passengers { get; set; }
}
}

namespace CommercialRegistration
{
public class DeliveryTruck
{
public int GrossWeightClass { get; set; }
}
}

namespace LiveryRegistration
{
public class Taxi
{
public int Fares { get; set; }
}

public class Bus
{
public int Capacity { get; set; }
public int Riders { get; set; }
}
}
171 changes: 171 additions & 0 deletions csharp8/ExploreCsharpEight/IndicesAndRanges.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,171 @@
using System;
using System.Linq;

namespace ExploreCsharpEight
{
class IndicesAndRanges
{
// TODO: replace in IndicesAndRanges.md when non-editable blocks are supported.
#region IndicesAndRanges_Initialization
private string[] words = new string[]
{
// index from start index from end
"The", // 0 ^9
"quick", // 1 ^8
"brown", // 2 ^7
"fox", // 3 ^6
"jumped", // 4 ^5
"over", // 5 ^4
"the", // 6 ^3
"lazy", // 7 ^2
"dog" // 8 ^1
};
#endregion

internal int Syntax_LastIndex()
{
#region IndicesAndRanges_LastIndex
Console.WriteLine($"The last word is {words[^1]}");
#endregion
return 0;
}

internal int Syntax_Range()
{
#region IndicesAndRanges_Range
var quickBrownFox = words[1..4];
foreach (var word in quickBrownFox)
Console.Write($"< {word} >");
Console.WriteLine();
#endregion
return 0;
}

internal int Syntax_LastRange()
{
#region IndicesAndRanges_LastRange
var lazyDog = words[^2..^0];
foreach (var word in lazyDog)
Console.Write($"< {word} >");
Console.WriteLine();
#endregion
return 0;
}

internal int Syntax_PartialRange()
{
#region IndicesAndRanges_PartialRanges
var allWords = words[..]; // contains "The" through "dog".
var firstPhrase = words[..4]; // contains "The" through "fox"
var lastPhrase = words[6..]; // contains "the, "lazy" and "dog"
foreach (var word in allWords)
Console.Write($"< {word} >");
Console.WriteLine();
foreach (var word in firstPhrase)
Console.Write($"< {word} >");
Console.WriteLine();
foreach (var word in lastPhrase)
Console.Write($"< {word} >");
Console.WriteLine();
#endregion
return 0;
}

internal int Syntax_IndexRangeType()
{
#region IndicesAndRanges_RangeIndexTypes
Index the = ^3;
Console.WriteLine(words[the]);
Range phrase = 1..4;
var text = words[phrase];
foreach (var word in text)
Console.Write($"< {word} >");
Console.WriteLine();
#endregion
return 0;
}

internal int Syntax_WhyChosenSemantics()
{
#region IndicesAndRanges_CreateRange
var numbers = Enumerable.Range(0, 100).ToArray();
int x = 12;
int y = 25;
int z = 36;
#endregion

#region IndicesAndRanges_MathWithLength
Console.WriteLine("===================== ^0 is the same as Length. =>");
Console.WriteLine($"{numbers[^x]} is the same as {numbers[numbers.Length - x]}");
Console.WriteLine($"{numbers[x..y].Length} is the same as {y - x}");
Console.WriteLine();
#endregion

#region IndicesAndRanges_Disjoint
Console.WriteLine("===================== Consecutive disjoint sequences. =>");
Console.WriteLine("numbers[x..y] and numbers[y..z] are consecutive and disjoint:");
Span<int> x_y = numbers[x..y];
Span<int> y_z = numbers[y..z];
Console.WriteLine($"\tnumbers[x..y] is {x_y[0]} through {x_y[^1]}, numbers[y..z] is {y_z[0]} through {y_z[^1]}");
Console.WriteLine();
#endregion

#region IndicesAndRanges_RemoveFromEnds
Console.WriteLine("===================== Remove elements from both ends. =>");
Console.WriteLine("numbers[x..^x] removes x elements at each end:");
Span<int> x_x = numbers[x..^x];
Console.WriteLine($"\tnumbers[x..^x] starts with {x_x[0]} and ends with {x_x[^1]}");
Console.WriteLine();
#endregion

#region IndicesAndRanges_IncompleteRanges
Console.WriteLine("===================== Incomplete sequences imply 0, ^0 =>");
Console.WriteLine("numbers[..x] means numbers[0..x] and numbers[x..] means numbers[x..^0]");
Span<int> start_x = numbers[..x];
Span<int> zero_x = numbers[0..x];
Console.WriteLine($"\t{start_x[0]}..{start_x[^1]} is the same as {zero_x[0]}..{zero_x[^1]}");
Span<int> z_end = numbers[z..];
Span<int> z_zero = numbers[z..];
Console.WriteLine($"\t{z_end[0]}..{z_end[^1]} is the same as {z_zero[0]}..{z_zero[^1]}");
Console.WriteLine();
#endregion
return 0;
}

internal int ComputeMovingAverages()
{
#region IndicesAndRanges_MovingAverage
int[] sequence = Sequence(1000);


for(int start = 0; start < sequence.Length; start += 100)
{
Range r = start..start+10;
var (min, max, average) = MovingAverage(sequence, r);
Console.WriteLine($"From {r.Start} to {r.End}: \tMin: {min},\tMax: {max},\tAverage: {average}");
}

for (int start = 0; start < sequence.Length; start += 100)
{
Range r = ^(start + 10)..^start;
var (min, max, average) = MovingAverage(sequence, r);
Console.WriteLine($"From {r.Start} to {r.End}: \tMin: {min},\tMax: {max},\tAverage: {average}");
}

(int min, int max, double average) MovingAverage(int[] subSequence, Range range) =>
(
subSequence[range].Min(),
subSequence[range].Max(),
subSequence[range].Average()
);
#endregion
return 0;
}


private int[] Sequence(int count)
{
return Enumerable.Range(0, count).Select(x => (int)(Math.Sqrt(x) * 100)).ToArray();
}
}
}
52 changes: 52 additions & 0 deletions csharp8/ExploreCsharpEight/NullableReferences.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,52 @@
using System;
using System.Collections.Generic;
using System.Text;

namespace ExploreCsharpEight
{
#region Nullable_PersonDefinition
#nullable enable
internal class Person
{
public string FirstName { get; set; }
public string MiddleName { get; set; }
public string LastName { get; set; }

public Person(string first, string last) =>
(FirstName, LastName) = (first, last);

public Person(string first, string middle, string last) =>
(FirstName, MiddleName, LastName) = (first, middle, last);

public override string ToString() => $"{FirstName} {MiddleName} {LastName}";
}
#nullable restore
#endregion

class NullableReferences
{

#region Nullable_GetLengthMethod
#nullable enable
private static int GetLengthOfMiddleName(Person p)
{
string middleName = p.MiddleName;
return middleName.Length;
}
#nullable restore
#endregion

internal int NullableTestBed()
{
#region Nullable_Usage
#nullable enable
Person miguel = new Person("Miguel", "de Icaza");
var length = GetLengthOfMiddleName(miguel);
Console.WriteLine(length);
#nullable restore
//Was this tested on a person who doesn't have a middle name?
#endregion
return 0;
}
}
}
Loading