在课堂上获取数据

时间:2012-04-23 23:58:37

标签: c# class

我有班级学生:

public class Student
    {
        public string Name { get; set; }
        public string Age { get; set; }
        public Student()
        {
        }
        public List<Student> getData()
        {
            List<Student> st = new List<Student> 
            {
                new Student{Name="Pham Nguyen",Age = "22"},
                new Student{Name="Phi Diep",Age = "22"},
                new Student{Name="Khang Tran",Age = "28"},
                new Student{Name="Trong Khoa",Age = "28"},
                new Student{Name="Quan Huy",Age = "28"},
                new Student{Name="Huy Chau",Age = "28"},
                new Student{Name="Hien Nguyen",Age = "28"},
                new Student{Name="Minh Sang",Age = "28"},
            };
            return st;
        }        
    }

如何在此课程中学习数据? (我的意思是 - 例子:我想拿Name =“Minh Sang”,年龄=“28”来表示。)

抱歉这个问题。但我不知道在哪里找到它。

感谢所有

5 个答案:

答案 0 :(得分:2)

您可以使用linq:

Student st = new Student();

var getStudent = from a in st.getData()
                      where a.Age == "28" & a.Name == "Minh Sang"
                      select a;

MessageBox.Show(getStudent.First().Age);
MessageBox.Show(getStudent.First().Name);

答案 1 :(得分:0)

查看List.Find方法:

http://msdn.microsoft.com/en-us/library/x0b5b5bc.aspx

接下来尝试实施一种新方法:

public Student GetStudent(string name, int age)

答案 2 :(得分:0)

调用getData()获取学生列表。

使用foreach循环遍历列表。

在循环内,打印出学生的姓名和年龄。

答案 3 :(得分:0)

也许您正在寻找DebuggerDisplay属性以在调试器中显示它?

[DebuggerDisplay("Name = {name}, Age={age}")]
public class Student {....}

因此,当您将鼠标悬停在Student类型的项目上时,它将以您想要的方式显示...

答案 4 :(得分:0)

编辑1: 将这些方法添加到您的班级:

public Student getStudent(int age, string name)
{
    return this.getData().Find(s => Convert.ToInt32(s.Age) == age && s.Name.Equals(name));
}

public Student getByIndex(int index)
{
    Student s = null;
    // maxIndex will be: 7
    // your array goes from 0 to 7
    int maxIndex = this.getData().Count() - 1;
    // If your index does not exceed the elements of the array:
    if (index <= maxIndex)
        s  = this.getData()[index];
    return s;
}
  • 如果您需要在将来int>进行评估,我会将年龄转换为<

编辑2: 然后调用这样的方法:

    Student st = new Student();
    // s1 and s2 will return null if no result found.
    Student s1 = st.getStudent(28, "Minh Sang");
    Student s2 = st.getByIndex(7);

    if (s1 != null)
        Console.WriteLine(s1.Age);
        Console.WriteLine(s1.Name);
    if (s2 != null)
        Console.WriteLine(s2.Age);
        Console.WriteLine(s2.Name);