如何使用来自WPF c#不同类的变量值

Question

我需要一些帮助，在另一个类中使用属于一个类的变量。

我有包含Weeks和StartDate属性的Semester类。

在另一个类CalcDisplay中，我有方法CalculateStudyHours，它应该根据Semester类的Weeks和StartDate属性计算学习时间。

我在WPF类中创建了一个Semester对象，我正在传递由用户提供的构造函数weeks和startDate值。

private void btnEnter_Click(object sender, RoutedEventArgs e)
{
int weeks = int.Parse(txtbWeeks.Text);
DateTime startDate = (DateTime)dteDate.SelectedDate;
Semester s = new Semester(weeks, startDate);
ModuleListHandler.semesterDetails.Add(s);
MessageBox.Show("Semester details added successfully");
btnNext.Visibility = Visibility.Hidden;
}

Semesterclass

namespace TimeManagementClassLibrary
{
public class Semester
{
public int Weeks { get; set; }
public DateTime StartDate { get; set; }
//default constructor
public Semester()
{
}
public Semester(int weeks, DateTime startdate)
{
Weeks = weeks;
StartDate = startdate;
}
}
}

CalcDisplayclass

public class CalcDisplay 
{
//Method calculating study hours
public double CalculateStudyHours()
{ 
return (credits * 10 / weeks) - classHours;
}          
}

将credits和weeks参数传递给CalcDisplay类的最有效方法是什么?

Answer 1

除了我的评论，让我们想象你有3个类:

public class Semester
{
public int Weeks { get; set; }
public Semester() { }
public Semester(int weeks)
{
Weeks = weeks;
}
}
public class Credit
{
public int Credits { get; set; }
public Credit() { }
public Credit(int credits)
{
Credits = credits;
}
}
public class SomeClass
{
public int ClassHours { get; set; }
public SomeClass() { }
public SomeClass(int classHours)
{
ClassHours = classHours;
}
}

你显然会创建它们的实例，并以某种方式设置/计算Weeks,Credits,ClassHours的值。

然后使用这些值作为参数传递给另一个类的方法:

public class CalcDisplay 
{ 
// May be static as uses passed in arguments values, non class members
public static double CalculateStudyHours(int credits, int weeks, int classHours) 
{          
return (credits * 10 / weeks) - classHours;            
}
}

并从某处传递它们:

private void btnEnter_Click(object sender, RoutedEventArgs e)
{
// Get values in some way
int weeks = int.Parse(txtbWeeks.Text);
int credits = int.Parse(txtbCredits.Text);
int classHours = int.Parse(txtbClassHours.Text);
// Create your instances
Semester s = new Semester(weeks);
Credit c = new Credit(credits);
SomeClass sc = new SomeClass(classHours);
// Then pass it's properties values
double result = CalcDisplay.CalculateStudyHours(c.Credits, s.Weeks, sc.ClassHours);
}

或者CalcDisplay类可以有自己的字段/属性，你可以通过它的构造函数设置:

public class CalcDisplay 
{ 
private int credits;
private int weeks;
private int classHours;
// Constructor
public CalcDisplay() {}
public CalcDisplay(int credits, int weeks, int classHours) 
{
this.credits = credits;
this.weeks = weeks;
this.classHours = classHours;
}
// Non-static as we use class members
public double CalculateStudyHours()
{          
return (credits * 10 / weeks) - classHours;            
}
}
private void btnEnter_Click(object sender, RoutedEventArgs e)
{
// ... same as upper
CalcDisplay = new CalcDisplay(c.Credits, s.Weeks, sc.ClassHours);
double result = c.CalculateStudyHours();
}