C#-随笔杂记

1.ConcurrentDictionary

ConcurrentDictionary　　并发字典，保证多线程情况下的安全性

Dictionary　　非线程安全集合

using System.Collections.Concurrent;

    class Program
    {
        static void Main(string[] args)
        {
            ConcurrentDictionary<string, Student> students = new ConcurrentDictionary<string, Student>();
            ConcurrentDictionary<string, Teacher> teachers = new ConcurrentDictionary<string, Teacher>();


            // 添加键值对
            students.TryAdd("刘一凡", new Student {Grade=1 ,Sex=Sex.Male,Age = 10});
            teachers.TryAdd("顾老师", new Teacher {TeachSubject="语文",Sex = Sex.Female,Age=45 });

            ////查询顾老师的信息
            if (teachers.TryGetValue("顾老师", out var teacher))
            {
                Console.WriteLine($"顾老师教授科目为：{teacher.TeachSubject}");
                Console.WriteLine($"顾老师年龄为：{teacher.Age}");
            }
            if (students.TryGetValue("刘一凡", out var student))
            {
                Console.WriteLine($"刘一凡所在年级为：{student.Grade}");
                Console.WriteLine($"刘一凡性别为：{student.Sex}");
            }
        }
    }

    enum Sex
    {
        Male,
        Female
    }

    internal class People
    {
        private int age;
        /// <summary>
        /// 年龄
        /// </summary>
        public int Age
        {
            get { return age; }
            set { age = value; }
        }

        private Sex sex;
        /// <summary>
        /// 性别
        /// </summary>
        public Sex Sex
        {
            get { return sex; }
            set { sex = value; }
        }

    }

    internal class Student:People
    {
        private int grade;
        /// <summary>
        /// 年级
        /// </summary>
        public int Grade
        {
            get { return grade; }
            set { grade = value; }
        }

    }

    internal class Teacher : People
    {
        private string teachSubject;
        /// <summary>
        /// 教授科目
        /// </summary>
        public string TeachSubject
        {
            get { return teachSubject; }
            set { teachSubject = value; }
        }

    }

2.ManualResetEvent

表示必须手动重置信号的线程同步事件。 无法继承此类。

public sealed class ManualResetEvent : System.Threading.EventWaitHandle

        static ManualResetEvent mre = new ManualResetEvent(false);
        static void Main(string[] args)
        {
            Thread th = new Thread(new ThreadStart(()=>
            {
                Thread.Sleep(1000);
                Console.WriteLine("Async Time =" + DateTime.Now.ToString("hh:mm:ss fff"));
                Thread.Sleep(5000);
                mre.Set();

            }));
            th.Start();
            Console.WriteLine("Start Time =" + DateTime.Now.ToString("hh:mm:ss fff"));
            mre.Reset();
            bool isback = mre.WaitOne();
            Console.WriteLine($"IsBack = {isback}");
            Console.WriteLine("End Time =" + DateTime.Now.ToString("hh:mm:ss fff"));
            Console.Read();
        }

3.wpf“调用线程无法访问此对象，因为另一个线程拥有该对象。

this.Dispatcher.Invoke(new Action(delegate
{

}));

4.Windows Presentation Foundation (WPF) 项目中不支持 Application

重新添加引用：PresentationCore    　　PresentationFramework　　　　WindowsBase