forked from idg10/prog-cs-8-examples
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Program.cs
146 lines (131 loc) · 4.24 KB
/
Program.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
using System;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
namespace ErrorHandling
{
class Program
{
private readonly IHttpClientFactory clientFactory;
private Program()
{
var services = new ServiceCollection();
services.AddHttpClient();
this.clientFactory = services.BuildServiceProvider().GetRequiredService<IHttpClientFactory>();
}
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
private static async Task<string> FindLongestLineAsync(
string url, IHttpClientFactory cf)
{
using (HttpClient w = cf.CreateClient())
{
Stream body = await w.GetStreamAsync(url);
using (var bodyTextReader = new StreamReader(body))
{
string longestLine = string.Empty;
while (!bodyTextReader.EndOfStream)
{
string line = await bodyTextReader.ReadLineAsync();
if (longestLine.Length > line.Length)
{
longestLine = line;
}
}
return longestLine;
}
}
}
private async Task HandleExceptions()
{
try
{
string longest = await FindLongestLineAsync(
"http://192.168.22.1/", this.clientFactory);
Console.WriteLine("Longest line: " + longest);
}
catch (HttpRequestException x)
{
Console.WriteLine("Error fetching page: " + x.Message);
}
}
class PotentiallySurprising
{
public async Task<string> FindLongestLineAsync(string url)
{
if (url == null)
{
throw new ArgumentNullException("url");
}
await Task.Yield();
return "";
}
}
class ThrowImmediately
{
public static Task<string> FindLongestLineAsync(string url)
{
if (url == null)
{
throw new ArgumentNullException("url");
}
return FindLongestLineCore(url);
static async Task<string> FindLongestLineCore(string url)
{
return await Program.FindLongestLineAsync(url, new Program().clientFactory);
}
}
}
static async Task CatchAll(Task[] ts)
{
try
{
var t = Task.WhenAll(ts);
await t.ContinueWith(
x => { },
TaskContinuationOptions.ExecuteSynchronously);
t.Wait();
}
catch (AggregateException all)
{
Console.WriteLine(all);
}
}
class Additional
{
static async Task CatchAll(Task[] ts)
{
Task t = null;
try
{
t = Task.WhenAll(ts);
await t;
}
catch (Exception first)
{
Console.WriteLine(first);
if (t != null && t.Exception.InnerExceptions.Count > 1)
{
Console.WriteLine("I've found some more:");
Console.WriteLine(t.Exception);
}
}
}
}
static async Task GetSeveral(IHttpClientFactory cf)
{
using (HttpClient w = cf.CreateClient())
{
w.MaxResponseContentBufferSize = 2_000_000;
Task<string> g1 = w.GetStringAsync("https://endjin.com/");
Task<string> g2 = w.GetStringAsync("https://oreilly.com");
// BAD!
Console.WriteLine((await g1).Length);
Console.WriteLine((await g2).Length);
}
}
}
}