示例

Sample.cs

public class Employee
{
    public int Salary;
}

public class Student
{
    public int Marks;
}

//a class with generic method
public class Sample
{
    //generic method
    public void PrintData<T>(T obj) where T : class
    {
        if (obj.GetType() == typeof(Student))
        {
            Student temp = obj as Student;
            System.Console.WriteLine(temp.Marks);
        }
        else if (obj.GetType() == typeof(Employee))
        {
            Employee temp = obj as Employee;
            System.Console.WriteLine(temp.Salary);
        }
    }
}

Program.cs

class Program
{
    static void Main()
    {
        //create objects
        Sample sample = new Sample();
        Employee emp = new Employee() { Salary = 1000 };
        Student stu = new Student() { Marks = 80 };

        //call the generic method
        sample.PrintData<Employee>(emp);
        sample.PrintData<Student>(stu);

        System.Console.ReadKey();
    }
}