public void Show()
{
List <Student> studentList = this.GetStudentList();
{
//找出年龄大于25
List <Student> result = new List <Student>(); //准备容器
foreach (Student student in studentList) //遍历数据源
{
if (student.Age > 25) //判断条件
{
result.Add(student); //满足条件的放入容器
}
}
Console.WriteLine($"结果一共有{result.Count()}个");
}
{
//this.GetList(studentList, 1);
ThanDelegate method = new ThanDelegate(this.Than);
List <Student> result = this.GetListDelegate(studentList, method);
Console.WriteLine($"结果一共有{result.Count()}个");
}
{
//找出Name长度大于2
List <Student> result = new List <Student>();
foreach (Student student in studentList)
{
if (student.Name.Length > 2)
{
result.Add(student);
}
}
Console.WriteLine($"结果一共有{result.Count()}个");
}
{
//this.GetList(studentList, 2);
ThanDelegate method = new ThanDelegate(this.LengthThan);
List <Student> result = this.GetListDelegate(studentList, method);
Console.WriteLine($"结果一共有{result.Count()}个");
}
{
//找出Name长度大于2 而且年龄大于25 而且班级id是2
List <Student> result = new List <Student>();
foreach (Student student in studentList)
{
if (student.Name.Length > 2 && student.Age > 25 && student.ClassId == 2)
{
result.Add(student);
}
}
Console.WriteLine($"结果一共有{result.Count()}个");
}
{
//this.GetList(studentList, 3);
ThanDelegate method = new ThanDelegate(this.AllThan);
List <Student> result = this.GetListDelegate(studentList, method);
Console.WriteLine($"结果一共有{result.Count()}个");
}
}
/// <summary>
/// 判断逻辑传递进来+实现共用逻辑
/// 委托解耦，减少重复代码
/// </summary>
/// <param name="source"></param>
/// <param name="method"></param>
/// <returns></returns>
private List <Student> GetListDelegate(List <Student> source, ThanDelegate method)
{
List <Student> result = new List <Student>();
foreach (Student student in source)
{
if (method.Invoke(student))
{
result.Add(student);
}
}
return(result);
}
/// <summary>
/// 委托方式 传入判断逻辑
/// 委托解耦：减少重复代码
/// </summary>
/// <param name="students"></param>
/// <param name="thanDelegate"></param>
/// <returns></returns>
public List <Student> GetStudentsDelegate(List <Student> students, ThanDelegate thanDelegate)
{
List <Student> result = new List <Student>();
foreach (var student in students)
{
if (thanDelegate.Invoke(student))
{
result.Add(student);
}
}
return(result);
}
/// <summary>
/// 把判断逻辑传递进来 + 实现共用逻辑
///
/// 委托解耦, 减少重复代码
/// </summary>
/// <param name="students"></param>
/// <param name="dDelegate"></param>
/// <returns></returns>
private List <Student> GetListDelegate(List <Student> students, ThanDelegate dDelegate)
{
List <Student> resultList = new List <Student>();
foreach (var student in students)
{
if (dDelegate.Invoke(student))
{
resultList.Add(student);
}
}
return(resultList);
}
public void Show()
{
List <Student> studentList = this.GetStudentList();
{
ThanDelegate method = new ThanDelegate(this.Than);
List <Student> result = this.GetListDelegate(studentList, method);
Console.WriteLine($"结果一共有{result.Count()}个");
}
{
ThanDelegate method = new ThanDelegate(this.LengthThan);
List <Student> result = this.GetListDelegate(studentList, method);
Console.WriteLine($"结果一共有{result.Count()}个");
}
{
ThanDelegate method = new ThanDelegate(this.AllThan);
List <Student> result = this.GetListDelegate(studentList, method);
Console.WriteLine($"结果一共有{result.Count()}个");
}
}
public void Show()
{
List <Student> students = this.GetStudents();
// 找出年龄大于25的
/* List<Student> result = new List<Student>();
* result = students.Where(x => x.Age > 10).ToList();
* foreach (var student in result)
* {
* Console.WriteLine(student.Name);
* }*/
// 准备容器
//List<Student> result = new List<Student>();
// 遍历
// foreach (var student in result)
// {
// // 判断
// if (student.Name.Length>2)
// {
// result.Add(student);
// }
// }
//
// Console.WriteLine($"一共有{result.Count}");
{
ThanDelegate ageThanDelegate = new ThanDelegate(this.AgeThan);
List <Student> result = this.GetStudentsDelegate(students, ageThanDelegate);
foreach (var student in result)
{
Console.WriteLine(student.Name);
}
ThanDelegate lengthThanDelegate = new ThanDelegate(this.LengthThan);
List <Student> result1 = this.GetStudentsDelegate(students, lengthThanDelegate);
}
}
public void Show()
{
List <Student> students = getStudents();
{
// 重复的实现,
{
//找出年龄大于25 的
List <Student> resuList = new List <Student>();
foreach (var student in students)
{
if (student.Age > 25)
{
resuList.Add(student);
}
}
Console.WriteLine($"total {resuList.Count}");
}
{
List <Student> resuList = new List <Student>();
foreach (var student in students)
{
if (student.Name.Length > 2)
{
resuList.Add(student);
}
}
Console.WriteLine($"total {resuList.Count}");
}
{
List <Student> resuList = new List <Student>();
foreach (var student in students)
{
if (student.Name.Length > 2 && student.Age > 25 && student.ClassId == 2)
{
resuList.Add(student);
}
}
Console.WriteLine($"total {resuList.Count}");
}
}
{
//委托
ThanDelegate method = new ThanDelegate(this.Than);
this.GetListDelegate(students, method);
ThanDelegate method2 = new ThanDelegate(this.LengthThan);
this.GetListDelegate(students, method2);
ThanDelegate method3 = new ThanDelegate(this.AllThan);
this.GetListDelegate(students, method3);
}
}
private List <Student> GetListDelegate(List <Student> source, ThanDelegate method)
{
}
