一个简单的C#案例----002_c# 数组筛选-优快云博客

本文链接：https://blog.youkuaiyun.com/m0_60429030/article/details/127615341

博客主要围绕C#语言，利用LINQ实现学生信息处理。包括筛选名字含‘o’且年龄大于20的学生信息、对学生数组按年龄和ID排序、根据ID奇偶分组输出学生信息，以及按特定格式输出学生姓名和年龄等功能，还给出提示代码和补全后的代码。

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描述

补全代码，通过LINQ实现如下功能：
筛选数组studentArray，筛选条件是名字中包含‘o’的学生信息,并且年龄大于20，将满足条件的学生信息输出到命令行

提示代码

class Student{
public int StudentID { get; set; }
public String StudentName { get; set; }
public int Age { get; set; }
}class Program{
static void Main(string[] args) {
Student[] studentArray = {
new Student() { StudentID = 1, StudentName = “John”, Age = 18 },
new Student() { StudentID = 2, StudentName = “Steve”, Age = 21 },
new Student() { StudentID = 3, StudentName = “Bill”, Age = 25 },
new Student() { StudentID = 4, StudentName = “Ram” , Age = 20 },
new Student() { StudentID = 5, StudentName = “Ron” , Age = 31 },
new Student() { StudentID = 6, StudentName = “Chris”, Age = 17 },
new Student() { StudentID = 7, StudentName = “Rob”,Age = 19 },
};

    待补全
}

}

补全后的完整代码

class Student

{

    public int StudentID { get; set; }

    public String StudentName { get; set; }

    public int Age { get; set; }

}

class Program

{

    static void Main(string[] args)

    {

        Student[] studentArray = {

            new Student() { StudentID = 1, StudentName = "John", Age = 18 },

            new Student() { StudentID = 2, StudentName = "Steve",  Age = 21 },

            new Student() { StudentID = 3, StudentName = "Bill",  Age = 25 },

            new Student() { StudentID = 4, StudentName = "Ram" , Age = 20 },

            new Student() { StudentID = 5, StudentName = "Ron" , Age = 31 },

            new Student() { StudentID = 6, StudentName = "Chris",  Age = 17 },

            new Student() { StudentID = 7, StudentName = "Rob",Age = 19  },

        };



        for(int i = 0;i < studentArray.Length;i++)

        {

            if (studentArray[i].StudentName.Contains('o') && studentArray[i].Age > 20)

            {

                Console.WriteLine("StudentID: " + studentArray[i].StudentID + " "+ " StudentName: " +studentArray[i].StudentName + " " + " Age: " + studentArray[i].Age);

            }

        }



    }

}

效果图

在这里插入图片描述

描述

补全代码，通过LINQ实现如下功能：
将数组studentArray排序，要求根据年龄排序，如果年龄相同，根据StudentID排序，将排序后的学生信息输出到命令行

提示代码

同上

补全后的代码

class Student

{

    public int StudentID { get; set; }

    public String StudentName { get; set; }

    public int Age { get; set; }

}

class Program

{

    static void Main(string[] args)

    {

        Student[] studentArray = {

            new Student() { StudentID = 1, StudentName = "John", Age = 18 },

            new Student() { StudentID = 2, StudentName = "Steve",  Age = 21 },

            new Student() { StudentID = 3, StudentName = "Bill",  Age = 25 },

            new Student() { StudentID = 4, StudentName = "Ram" , Age = 20 },

            new Student() { StudentID = 5, StudentName = "Ron" , Age = 31 },

            new Student() { StudentID = 6, StudentName = "Chris",  Age = 17 },

            new Student() { StudentID = 7, StudentName = "Rob",Age = 19  },

        };

        studentArray = studentArray.OrderBy(x => x.Age).ThenByDescending(x => x.StudentID).ToArray();



        Console.WriteLine("StudentID\t" + "StudentName\t" + "Age\t");

        for (int i = 0; i < studentArray.Length; i++)

        {

            Console.WriteLine(" " + studentArray[i].StudentID + "\t\t " + studentArray[i].StudentName + "\t\t " + studentArray[i].Age);

        }

    }

}

效果图

在这里插入图片描述

描述

补全代码，通过LINQ实现如下功能：
根据SudentID进行分组，输出SudengtId分别为奇数/偶数的学生信息

提示代码

同上

补全后的代码

class Student

{

    public int StudentID { get; set; }

    public String StudentName { get; set; }

    public int Age { get; set; }

    public bool Key { get; internal set; }

}

class Program

{

    static void Main(string[] args)

    {

        Student[] studentArray = {

            new Student() { StudentID = 1, StudentName = "John", Age = 18 },

            new Student() { StudentID = 2, StudentName = "Steve",  Age = 21 },

            new Student() { StudentID = 3, StudentName = "Bill",  Age = 25 },

            new Student() { StudentID = 4, StudentName = "Ram" , Age = 20 },

            new Student() { StudentID = 5, StudentName = "Ron" , Age = 31 },

            new Student() { StudentID = 6, StudentName = "Chris",  Age = 17 },

            new Student() { StudentID = 7, StudentName = "Rob",Age = 19  },

        };

        var query = from stu in studentArray group stu by stu.StudentID % 2;

        foreach(var student in query) { 

            Console.WriteLine(student.Key == 0 ? "----------------偶数----------------" : "----------------奇数----------------");

            Console.WriteLine("StudentID\t" + "StudentName\t" + "Age\t");

            foreach (var item in student)

            {

                Console.WriteLine(" " + item.StudentID + "\t\t " + item.StudentName + "\t\t " + item.Age);

            }

        }

    }

}

效果图

在这里插入图片描述

描述

补全代码，通过LINQ实现如下功能：
输出sudengtArray信息，要求不输出SudengtID字段，输出SudengtName和Age，其中SudengtName要求根据Gender增加Mr. 和Ms. 前缀

提示代码

class Student{
public int StudentID { get; set; }
public String StudentName { get; set; }
public int Age { get; set; }
public String Gender { get; set; }
}class Program{
static void Main(string[] args) {
Student[] studentArray = {
new Student() { StudentID = 1, StudentName = “John”, Age = 18, Gender = “Male” },
new Student() { StudentID = 2, StudentName = “Steve”, Age = 21, Gender = “Male” },
new Student() { StudentID = 3, StudentName = “Bill”, Age = 25, Gender = “Male” },
new Student() { StudentID = 4, StudentName = “Ram” , Age = 21, Gender = “Male” },
new Student() { StudentID = 5, StudentName = “Ron” , Age = 31, Gender = “Female” },
new Student() { StudentID = 6, StudentName = “Chris”, Age = 17, Gender = “Female” },
new Student() { StudentID = 7, StudentName = “Rob”,Age = 19, Gender = “Male” },
};

    //待补全...
}

}

补全后的代码

class Student

{

    public int StudentID { get; set; }

    public String StudentName { get; set; }

    public int Age { get; set; }

    public String Gender { get; set; }

}

class Program

{

    static void Main(string[] args)

    {

        Student[] studentArray = {

            new Student() { StudentID = 1, StudentName = "John", Age = 18, Gender = "Male" },

            new Student() { StudentID = 2, StudentName = "Steve",  Age = 21, Gender = "Male" },

            new Student() { StudentID = 3, StudentName = "Bill",  Age = 25, Gender = "Male" },

            new Student() { StudentID = 4, StudentName = "Ram" , Age = 21, Gender = "Male" },

            new Student() { StudentID = 5, StudentName = "Ron" , Age = 31, Gender = "Female" },

            new Student() { StudentID = 6, StudentName = "Chris",  Age = 17, Gender = "Female" },

            new Student() { StudentID = 7, StudentName = "Rob",Age = 19, Gender = "Male"  },

        };

        var query = from stu in studentArray where stu.Age > 0 select stu;

        Console.WriteLine("StudentName\t" + "Age");

        foreach (var student in query)

        {

            

            if (student.Gender != "Male")

            {

                Console.WriteLine("Ms." + student.StudentName + "\t\t" + student.Age);

            } else

            {

                Console.WriteLine("Mr." + student.StudentName + "\t\t" + student.Age);

            }



        }



    }

}