我正在尝试实现一个将由饮料列表填充的Beverage Crate数组，但是我在创建数组时遇到了问题。我已尝试在程序中做一些临时解决方案，但由于crate数组不能正常工作，我无法让它们工作。问题出在Crate Class和主类中，其中add-drink方法不起作用。
如何在不使用包列表的情况下让我的数组工作？ 我得到的一个错误是
{
if (crate.Count >= MaxItems)
{
Console.WriteLine("The crate is full. Please remove an item first!");
}
else
{
crate.Add(beverage);
我得到一个编译错误操作数＆gt; =不能应用于int类型的方法组，饮料不包含在crate.add行中添加的定义
class Menu : Crate
{
static void Main(string[] args)
{
ShowMenu(); // Wait for input before closing
Console.WriteLine("\nDone!\nPress any key to exit...");
Console.ReadKey();
}
public static void ShowMenu()
{
bool exit = false;
var beverages = new Crate();
do
{
Console.WriteLine("[1] Add Bottle from existing list to Bottle Crate");// TODO IMPLEMENT
Console.WriteLine("[2] Remove Bottle from Bottle Crate");
Console.WriteLine("[3] Show Bottle Crate");// TODO IMPLEMENT
Console.WriteLine("[4] Add custom beverage to array");
Console.WriteLine("[5] Remove Beverage from list"); // TODO
Console.WriteLine("[6] Sort Bottles in Bottle Crate according to name");// TODO IMPLEMENT
Console.WriteLine("[7] AutoFill crate");
Console.WriteLine("[8] Calculate the Total Cost in Crate"); // TODO IMPLEMENT
Console.WriteLine("[9] Search in crate after beverage"); // TODO IMPLEMENT
Console.WriteLine("[0] Exit the program");
ConsoleKeyInfo info = Console.ReadKey();
int selection;
int.TryParse(info.KeyChar.ToString(), out selection);
switch (selection)
{
case 1:
break;
case 2:
//beverages.Remove();
//break;
case 3:
Console.WriteLine("\nHere are the contents of the crate:\n");
Console.ForegroundColor = ConsoleColor.Green;
beverages.PrintCrate();
Console.ResetColor();
break;
case 4:
var numBevs = Math.Max(GetInt("How many beverages would you like to enter: "), 0);
for (int i = 0; i < numBevs; i++)
{
Console.WriteLine($"\nEnter beverage #{i + 1} info");
Console.WriteLine("-----------------------");
beverages.Add(Beverages.GetBeverageFromUser());
Console.WriteLine("-----------------------\n");
}
break;
//case 5:
// Remove_Beverage();
// break;
//case 6:
// SortCrate();
// break;
case 7:
numBevs = Math.Max(GetInt("How many would you like to be auto-added: "), 0);
for (int i = 0; i < numBevs; i++)
{
beverages.Add(Beverages.GetRandomBeverage());
}
Console.WriteLine("-----------------------\n");
break;
//case 8:
// Calc_Total();
// break;
//case 9:
// //SearchArray();
// break;
case 0:
exit = true;
break;
default:
ShowMenu();
break;
}
} while (!exit) ;
}
}
}
class Crate : IEnumerable<Beverage>
{
private Beverage[] crate = new Beverage[24];
private int numberOfBottles = 0;
private const int MaxItems = 24;
public void Add(Beverage beverage)
{
if (crate.Count >= MaxItems)
{
Console.WriteLine("The crate is full. Please remove an item first!");
}
else
{
crate.Add(beverage);
}
}
public IEnumerator<Beverage> GetEnumerator()
{
return crate.AsEnumerable().GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public void Remove(string name)
{
Remove(crate.FirstOrDefault(i =>
i.Name.Equals(name, StringComparison.OrdinalIgnoreCase)));
}
public void Remove(Beverage beverage)
{
if (crate.Contains(beverage)) crate.Remove(beverage);
}
public void PrintCrate()
{
if (crate.Count == 0)
{
Console.WriteLine("There are no items in the crate.");
}
else
{
crate.ForEach(Console.WriteLine);
}
}
//public int find_Soda(string drinkname)
//{
// for (int i = 0; i < bottles.Length; i++)
// {
// if (bottles[i].Drink_name == drinkname) //My feeble attempts
// return i;
// }
// return -1;
//}
//public void sort_Sodas_name()
//{
// int max = bottles.Length;
// //Outer loop for complete [bottles]
// for (int i = 1; i < max; i++)
// {
// //Inner loop for row by row
// int nrLeft = max - i;
// for (int j = 0; j < (max - i); j++)
// {
// var bottle1 = bottles[j];
// var bottle2 = bottles[j + 1];
// if ((bottle1 == null) || (bottle2 == null))
// {
// continue;
// }
// if (bottle1.name.CompareTo(bottle2.Drink_name) == 1)
// {
// var temp = bottles[j];
// bottles[j] = bottles[j + 1];
// bottles[j + 1] = temp;
//public int calc_total()
//{
// int temp = 0;
// for (int i = 0; i < bottleCount(); i++)
// {
// temp = temp + (bottles[i].Price);
// }
// return temp;
public static int GetInt(string message)
{
int result;
Console.Write(message);
while (!int.TryParse(Console.ReadLine(), out result))
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Invalid number");
Console.ResetColor();
Console.Write(message);
}
return result;
}
}
}
public class Beverages
{
private static readonly Random Rnd = new Random();
public static Beverage GetBeverageFromUser()
{
return new Beverage
{
Name = GetName("Enter name: "),
Price = GetCurrency("Enter cost: "),
Type = GetBeverageType("Enter type: "),
Size = GetSize("Enter size: ")
};
}
public static Beverage GetRandomBeverage()
{
var names = new List<Beverage>
{
new Beverage {Name = "Coke", Price = .75m,
Size = 12, Type = BeverageType.Soda},
new Beverage {Name = "Pepsi", Price = .75m,
Size = 12, Type = BeverageType.Soda},
new Beverage {Name = "Sprite", Price = .75m,
Size = 12, Type = BeverageType.Soda},
new Beverage {Name = "Rootbeer", Price = .75m,
Size = 12, Type = BeverageType.Soda},
new Beverage {Name = "Orange Juice", Price = .5m,
Size = 10, Type = BeverageType.Juice},
new Beverage {Name = "Apple Juice", Price = .5m,
Size = 10, Type = BeverageType.Juice},
new Beverage {Name = "Grape Juice", Price = .5m,
Size = 10, Type = BeverageType.Juice},
new Beverage {Name = "Water", Price = .25m,
Size = 20, Type = BeverageType.Water},
new Beverage {Name = "Beer", Price = 2.75m,
Size = 16, Type = BeverageType.Alcohol},
new Beverage {Name = "Wine", Price = 3.5m,
Size = 9, Type = BeverageType.Alcohol},
};
return names[Rnd.Next(names.Count)];
}
private static BeverageType GetBeverageType(string message)
{
BeverageType beverageType;
Console.Write(message);
while (!Enum.TryParse(Console.ReadLine(), true, out beverageType))
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Invalid beverage type");
Console.ResetColor();
Console.Write("Valid beverage types are: ");
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine(string.Join(", ", Enum.GetNames(typeof(BeverageType))));
Console.ResetColor();
Console.Write(message);
}
return beverageType;
}
private static string GetName(string message)
{
Console.Write(message);
return Console.ReadLine();
}
private static decimal GetCurrency(string message)
{
decimal result;
Console.Write(message);
while (!decimal.TryParse(Console.ReadLine(), NumberStyles.Currency,
CultureInfo.CurrentCulture, out result))
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Invalid number");
Console.ResetColor();
Console.Write(message);
}
return result;
}
private static int GetSize(string message)
{
int result;
Console.Write(message);
while (!int.TryParse(Console.ReadLine(), NumberStyles.Currency, CultureInfo.CurrentCulture, out result))
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Invalid Size");
Console.ResetColor();
Console.Write(message);
}
return result;
}
}
}
{
public enum BeverageType
{
Soda,
Juice,
Water,
Alcohol
}
public class Beverage
{
public string Name { set; get; }
public BeverageType Type { set; get; }
public decimal Price { set; get; }
public int Size { get; set; }
public override string ToString()
{
return $"{Name} ({Type}) = {Price:C}";
}
}
}
答案 0 :(得分：0)
IEnumerable<T>没有 添加 和 删除 方法。我们通常会继承List，除非您有特定要求使用IEnumerable<T>。
例如，
class Crate : List<Beverage>
{
public new void Add(Beverage beverage)
{
if (Count == 24)
{
Console.WriteLine("The crate is full. Please remove an item first!");
}
else
{
base.Add(beverage);
}
}
public void Remove(string name)
{
Remove(this.FirstOrDefault(i => i.Name.Equals(name, StringComparison.OrdinalIgnoreCase)));
}
public void PrintCrate()
{
if (this.Count == 0)
{
Console.WriteLine("There are no items in the crate.");
}
else
{
this.ForEach(Console.WriteLine);
}
}
}
IEnumerable<T>继承由于您必须按照要求使用 数组 ，因此您必须实施 添加 和 自行删除 方法。添加非常简单，但删除有点棘手。
class Crate : IEnumerable<Beverage>
{
private Beverage[] crate = new Beverage[24];
private int NumberOfBottles = 0;
private const int MaxItems = 24;
public void Add(Beverage beverage)
{
if (NumberOfBottles >= MaxItems)
{
Console.WriteLine("The crate is full. Please remove an item first!");
}
else
{
crate[NumberOfBottles] = beverage;
NumberOfBottles++;
}
}
public IEnumerator<Beverage> GetEnumerator()
{
return crate.AsEnumerable().GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public void Remove(string name)
{
Remove(crate.FirstOrDefault(i =>
i.Name.Equals(name, StringComparison.OrdinalIgnoreCase)));
}
public void Remove(Beverage beverage)
{
int index = Array.IndexOf(crate, beverage, 0, NumberOfBottles);
if (index < 0)
return;
this.RemoveAt(index);
}
/// <summary>
/// Removes the element at the specified index of the Beverage array.
/// </summary>
/// <param name="index">The zero-based index of the element to remove.</param>
public void RemoveAt(int index)
{
if (index < NumberOfBottles)
{
NumberOfBottles--;
Array.Copy(crate, index + 1, crate, index, NumberOfBottles - index);
crate[NumberOfBottles] = default(Beverage);
}
}
public void PrintCrate()
{
if (NumberOfBottles == 0)
{
Console.WriteLine("There are no items in the crate.");
}
else
{
foreach (var beverage in this)
Console.WriteLine(beverage);
}
}
}