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云南大王-一个简单的例子看明白 async await Task
发布时间：2020-04-16 00:00:00
测试代码：
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Threading;
9 using System.Threading.Tasks;
10 using System.Windows.Forms;
11 using Utils;
12
13 namespace test
14 {
15 public partial class Form1 : Form
16 {
17 public Form1()
18 {
19 InitializeComponent();
20 }
21
22 private void Form1_Load(object sender, EventArgs e)
23 {
24
25 }
26
27 ///
28 /// 执行任务
29 ///
30 public string DoWork(string str)
31 {
32 Thread.Sleep(3000); //模拟延迟 比如网络请求 用了3000毫秒
33 return "输出：" + str;
34 }
35
36 ///
37 /// 执行任务
38 ///
39 public Task DoWorkByTask(string str)
40 {
41 return Task.Run(() =>
42 {
43 Thread.Sleep(3000); //模拟延迟 比如网络请求 用了3000毫秒
44 return "输出：" + str;
45 });
46 }
47
48 ///
49 /// 测试1
50 ///
51 private async void button1_Click(object sender, EventArgs e)
52 {
53 LogTimeUtil logTime = new LogTimeUtil();
54
55 var t1 = DoWorkByTask("测试值1");
56
57 var t2 = DoWorkByTask("测试值2");
58
59 string r1 = await t1;
60
61 textBox1.AppendText(r1 + "\r\n");
62
63 string r2 = await t2;
64
65 textBox1.AppendText(r2 + "\r\n");
66
67 logTime.LogTime("耗时", textBox1);
68 }
69
70 ///
71 /// 测试2
72 ///
73 /// 等效于 测试1
74 ///
75 private void button2_Click(object sender, EventArgs e)
76 {
77 Task.Run(() => //如果不加Task.Run，界面会卡
78 {
79 LogTimeUtil logTime = new LogTimeUtil();
80
81 Task t1 = Task.Run(() => { return DoWork("测试值1"); });
82 Task t2 = Task.Run(() => { return DoWork("测试值2"); });
83
84 Task.WaitAll(t1, t2);
85
86 this.Invoke(new Action(() => //线程中修改控件数据要使用Invoke
87 {
88 textBox1.AppendText(t1.Result + "\r\n");
89 textBox1.AppendText(t2.Result + "\r\n");
90 }));
91
92 logTime.LogTime("耗时", textBox1);
93 });
94 }
95
96 ///
97 /// 测试3
98 ///
99 private async void button3_Click(object sender, EventArgs e)
100 {
101 LogTimeUtil logTime = new LogTimeUtil();
102
103 var r1 = await DoWorkByTask("测试值1");
104
105 textBox1.AppendText(r1 + "\r\n");
106
107 var r2 = await DoWorkByTask("测试值2");
108
109 textBox1.AppendText(r2 + "\r\n");
110
111 logTime.LogTime("耗时", textBox1);
112 }
113
114 ///
115 /// 测试4
116 ///
117 /// 等效于 测试3
118 ///
119 private void button4_Click(object sender, EventArgs e)
120 {
121 Task.Run(() => //如果不加Task.Run，界面会卡
122 {
123 LogTimeUtil logTime = new LogTimeUtil();
124
125 Task t1 = Task.Run(() => { return DoWork("测试值1"); });
126 t1.Wait();
127 this.Invoke(new Action(() => //线程中修改控件数据要使用Invoke
128 {
129 textBox1.AppendText(t1.Result + "\r\n");
130 }));
131
132 Task t2 = Task.Run(() => { return DoWork("测试值2"); });
133 t2.Wait();
134 this.Invoke(new Action(() => //线程中修改控件数据要使用Invoke
135 {
136 textBox1.AppendText(t2.Result + "\r\n");
137 }));
138
139 logTime.LogTime("耗时", textBox1);
140 });
141 }
142
143 }
144 }
View Code
测试输出：
附 LogTimeUtil.cs：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Utils
{
///
/// 记录耗时
///
public class LogTimeUtil
{
private DateTime _lastTime;
public LogTimeUtil()
{
_lastTime = DateTime.Now;
}
///
/// 记录耗时
///
public void LogTime(string msg)
{
double d = DateTime.Now.Subtract(_lastTime).TotalSeconds;
LogUtil.Log(msg + "，耗时：" + d.ToString("0.000") + " 秒");
}
///
/// 记录耗时
///
public void LogTime(string msg, TextBox txt)
{
double d = DateTime.Now.Subtract(_lastTime).TotalSeconds;
msg = msg + "，耗时：" + d.ToString("0.000") + " 秒\r\n";
if (txt.InvokeRequired)
{
txt.Invoke(new Action(() =>
{
txt.AppendText(msg);
}));
}
else
{
txt.AppendText(msg);
}
}
}
}
View Code
