c# ICollection 代码实例

这段代码展示了一个名为MyCollection的类，它实现了ICollection接口。该类包含一个字符串数组list和一个对象root。MyCollection类的构造函数初始化了list数组。该类实现了ICollection接口的成员，包括IsSynchronized、Count、CopyTo和SyncRoot。此外，该类还实现了IEnumerable接口的GetEnumerator方法。ICollection接口是System.Collections命名空间中类的基接口，提供了同步处理、赋值及返回内含元素数目的功能。

下面是这段代码的实例化过程：

MyCollection myCollection = new MyCollection();
Console.WriteLine("Count: {0}", myCollection.Count);
Console.WriteLine("SyncRoot: {0}", myCollection.SyncRoot);

相关问题

c# ICollection

C# ICollection是一个接口，它定义了一组方法，用于操作非泛型集合。ICollection接口提供了添加、删除、清空和判断集合中是否包含某个元素等方法。此外，ICollection还定义了一个Count属性，用于获取集合中元素的数量。ICollection接口是IEnumerable接口的扩展，因此，它也继承了IEnumerable接口的GetEnumerator方法，用于返回一个IEnumerator对象，该对象可用于循环访问集合中的元素。

C#员工薪资管理系统代码

以下是一个简单的C#员工薪资管理系统的代码示例，供参考：

1.数据库连接和实体类定义

using System.Data.Entity;

// 定义员工、工资和科室的实体类
public class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Gender { get; set; }
    public int Age { get; set; }
    public string Department { get; set; }
    public string Position { get; set; }
    public virtual Salary Salary { get; set; }
}

public class Salary
{
    public int Id { get; set; }
    public int BasicSalary { get; set; }
    public int Bonus { get; set; }
    public int Allowance { get; set; }
    public int Deduction { get; set; }
    public int TotalSalary { get; set; }
    public virtual Employee Employee { get; set; }
}

public class Department
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public virtual ICollection<Employee> Employees { get; set; }
}

// 数据库连接
public class EmployeeContext : DbContext
{
    public DbSet<Employee> Employees { get; set; }
    public DbSet<Salary> Salaries { get; set; }
    public DbSet<Department> Departments { get; set; }
}

2.数据录入和修改

using System.Linq;

// 添加员工信息
private void AddEmployee(Employee employee)
{
    using (var db = new EmployeeContext())
    {
        db.Employees.Add(employee);
        db.SaveChanges();
    }
}

// 更新员工信息
private void UpdateEmployee(Employee employee)
{
    using (var db = new EmployeeContext())
    {
        var e = db.Employees.Find(employee.Id);
        if (e != null)
        {
            e.Name = employee.Name;
            e.Gender = employee.Gender;
            e.Age = employee.Age;
            e.Department = employee.Department;
            e.Position = employee.Position;
            db.SaveChanges();
        }
    }
}

// 加载员工列表
private void LoadEmployees()
{
    using (var db = new EmployeeContext())
    {
        var employees = db.Employees.Include(e => e.Salary).ToList();
        dataGridViewEmployees.DataSource = employees;
    }
}

// 保存员工信息
private void buttonSave_Click(object sender, EventArgs e)
{
    var employee = new Employee
    {
        Name = textBoxName.Text,
        Gender = comboBoxGender.Text,
        Age = int.Parse(textBoxAge.Text),
        Department = comboBoxDepartment.Text,
        Position = comboBoxPosition.Text,
        Salary = new Salary
        {
            BasicSalary = int.Parse(textBoxBasicSalary.Text),
            Bonus = int.Parse(textBoxBonus.Text),
            Allowance = int.Parse(textBoxAllowance.Text),
            Deduction = int.Parse(textBoxDeduction.Text)
        }
    };

    // 根据ID判断是添加还是更新操作
    if (string.IsNullOrEmpty(textBoxId.Text))
    {
        AddEmployee(employee);
    }
    else
    {
        employee.Id = int.Parse(textBoxId.Text);
        UpdateEmployee(employee);
    }

    LoadEmployees();
}

3.计算工资和统计分析

using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;

// 计算员工工资
private void CalculateSalary(Employee employee)
{
    var salary = employee.Salary;
    salary.TotalSalary = salary.BasicSalary + salary.Bonus + salary.Allowance - salary.Deduction;
}

// 加载统计信息
private void LoadStatistics()
{
    using (var db = new EmployeeContext())
    {
        var departments = db.Departments.Include(d => d.Employees.Select(e => e.Salary));
        var statistics = new List<Statistic>();

        foreach (var department in departments)
        {
            var employees = department.Employees;
            var count = employees.Count();
            var totalSalary = employees.Sum(e => e.Salary.TotalSalary);
            var statistic = new Statistic
            {
                Department = department.Name,
                Count = count,
                TotalSalary = totalSalary
            };
            statistics.Add(statistic);
        }

        dataGridViewStatistics.DataSource = statistics;
    }
}

// 统计信息实体类
public class Statistic
{
    public string Department { get; set; }
    public int Count { get; set; }
    public int TotalSalary { get; set; }
}

4.数据删除和查询

using System.Data.Entity;
using System.Linq;

// 删除员工信息
private void DeleteEmployee(int employeeId)
{
    using (var db = new EmployeeContext())
    {
        var employee = db.Employees.Find(employeeId);
        if (employee != null)
        {
            db.Employees.Remove(employee);
            db.SaveChanges();
        }
    }
}

// 查询员工信息
private void SearchEmployees(string keyword)
{
    using (var db = new EmployeeContext())
    {
        var employees = db.Employees.Include(e => e.Salary).Where(e => e.Name.Contains(keyword)).ToList();
        dataGridViewEmployees.DataSource = employees;
    }
}

// 删除员工按钮点击事件
private void buttonDelete_Click(object sender, EventArgs e)
{
    if (dataGridViewEmployees.SelectedRows.Count > 0)
    {
        var employeeId = int.Parse(dataGridViewEmployees.SelectedRows[0].Cells[0].Value.ToString());
        DeleteEmployee(employeeId);
        LoadEmployees();
    }
}

// 查询员工按钮点击事件
private void buttonSearch_Click(object sender, EventArgs e)
{
    var keyword = textBoxKeyword.Text;
    SearchEmployees(keyword);
}

以上是一个简单的C#员工薪资管理系统的代码示例，具体实现细节可以根据实际业务需求进行设计。