給出一些背景關系。所以對于這個專案，我有一個類變數陣列 cd1. 那是 AudioCD 的變數，它是一個陣列，因為如果用戶想在陣列中輸入更多的 CD。
我遇到的問題是，當我在類陣列中輸入一個以上的 cd 時，在我添加字串或藝術家的部分周圍是我遇到問題的地方。當我去列印應該單獨的類變數特定索引時，除了顯示最后輸入的行的藝術家陣列之外，幾乎所有東西都出于某種奇怪的原因。我試圖弄清楚它為什么這樣做。
PS。對不起，我的解釋不是最好的。
正如你在圖片中看到的那樣。輸出應該是當我為選擇輸入 1 并且為 CD 輸入 1 時，陣列應該使用索引 0 的陣列，但它使用的是最后輸入的 CD 中的陣列。輸出應該是：
男人1男人2男人3
但它是：
男人4男人5男人6
class AudioCD
{
// Private Variables for CDclass
public string cdTitle { get; private set; }
private string[] artists = new string[4];
public int releaseYear { get; private set; }
public string genre { get; private set; }
public float condition { get; private set; }
// Constructor for the CDclass - initializes all variables used in the CDclass
public AudioCD()
{
cdTitle = "";
artists = new string[] {"","","",""};
releaseYear = 1980;
genre = "";
condition = 0.0f;
}
// Overload Constructor for the CDclass - initializes all the variables to user input variables
public AudioCD(string cdt, string[] art, int reY, string gen, float con)
{
cdTitle = cdt;
if (artists.Length < art.Length)
{
Console.WriteLine("Your Array size is bigger then 4 for the Artist so the first 4 names will be used!");
}
artists = art;
if (reY < 1980)
{
releaseYear = 1980;
}
else
{
releaseYear = reY;
}
genre = gen;
if (con < 0.0f || con > 5.0f)
{
condition = 0.0f;
}
else
{
condition = con;
}
}
public void printAudioCD()
{
Console.Write(cdTitle ", " releaseYear "\n" );
for (int i = 0; i < artists.Length; i )
{
if (artists[i] != "" )
{
Console.WriteLine("Artist (#" (i 1) "): " artists[i]);
}
}
Console.WriteLine("Genre: " genre);
Console.WriteLine("Condition: " condition);
}
}
和Program類：
class Program
{
static void Main(string[] args)
{
// variables
string uI, cdtitle, genre;
int size = 0, releaseYear, choice, arrInd;
string[] artistArray = new string[4] {"", "", "", "" };
float condition;
//
AudioCD remote = new AudioCD();
Console.Write("How many CDs do you have lying around your car? ");
uI = Console.ReadLine();
size = Convert.ToInt32(uI);
AudioCD[] cd1 = new AudioCD[size];
for (int i = 0; i < size; i )
{
Console.WriteLine("CD #" (i 1));
Console.Write("*Enter Title: ");
uI = Console.ReadLine();
cdtitle = uI;
Console.WriteLine("*Enter Artists (type -1 when finished):");
int j = 0;
do
{
uI = Console.ReadLine();
if (uI != "-1")
artistArray[j] = uI;
j ;
// Resize the array by One Element
if (j >= 4 && uI != "-1")
{
Array.Resize(ref artistArray, artistArray.Length 1);
artistArray[j] = "";
}
} while (uI != "-1" );
Console.Write("*Enter Genre: ");
uI = Console.ReadLine();
genre = uI;
Console.Write("*Enter Release Year: ");
uI = Console.ReadLine();
releaseYear = Convert.ToInt32(uI);
Console.Write("*Enter Condition: ");
uI = Console.ReadLine();
condition = float.Parse(uI);
Console.Write("\n");
// switch to select which class of cd to put information in
cd1[i] = new AudioCD(cdtitle, artistArray, releaseYear, genre, condition);
}
bool isPlaying = true;
while(isPlaying)
{
Console.Write("\n");
Console.WriteLine("[Main Menu]");
Console.WriteLine("1) Album Info");
Console.WriteLine("2) Find a CD");
Console.WriteLine("3) Find an artist");
Console.WriteLine("4) Log off");
Console.Write("Choice: ");
uI = Console.ReadLine();
choice = Convert.ToInt32(uI);
switch(choice)
{
case 1:
{
Console.Write("\nWhich CD do you want? ");
uI = Console.ReadLine();
arrInd = Convert.ToInt32(uI);
if (arrInd >= 1 || arrInd <= size)
{
Console.Write(arrInd ". ");
cd1[(arrInd - 1)].printAudioCD();
}
break;
}
case 2:
{
break;
}
case 3:
{
break;
}
case 4:
{
isPlaying = false;
break;
}
default:
{
break;
}
}
}
}
}
輸出 如圖所示。輸出應該是當我為選擇輸入 1 并且為 CD 輸入 1 時，陣列應該使用索引 0 的陣列，但它使用的是最后輸入的 CD 中的陣列。輸出應該是 man1、man2 和 man3，但它是 man4、man5 和 man6。
uj5u.com熱心網友回復：
您在Main()每次迭代中使用相同的陣列，這就是您從最后輸入的 CD 中獲得藝術家的原因。我的意思是這個代碼片段：
string[] artistArray = new string[4] {"", "", "", "" };
在這里，我們可以使用List<T>來避免撰寫調整陣列大小的代碼，并且可以使用Clear()方法來避免存盤上一張 CD 中的藝術家。
整個代碼看起來像這樣。我使用List稍微重構了您的代碼：
班級AudioCD：
public class AudioCD
{
// Private Variables for CDclass
public string cdTitle { get; private set; }
private List<string> artists = new List<string>();
public int releaseYear { get; private set; }
public string genre { get; private set; }
public float condition { get; private set; }
// Constructor for the CDclass - initializes all variables used in the CDclass
public AudioCD()
{
cdTitle = "";
releaseYear = 1980;
genre = "";
condition = 0.0f;
}
// Overload Constructor for the CDclass - initializes all the variables to user input variables
public AudioCD(string cdt, List<string> art, int reY, string gen, float con)
{
cdTitle = cdt;
artists.AddRange(art);
if (reY < 1980)
{
releaseYear = 1980;
}
else
{
releaseYear = reY;
}
genre = gen;
if (con < 0.0f || con > 5.0f)
{
condition = 0.0f;
}
else
{
condition = con;
}
}
public void printAudioCD()
{
Console.Write(cdTitle ", " releaseYear "\n");
for (int i = 0; i < artists.Count; i )
{
if (artists[i] != "")
{
Console.WriteLine("Artist (#" (i 1) "): " artists[i]);
}
}
Console.WriteLine("Genre: " genre);
Console.WriteLine("Condition: " condition);
}
}
和Main方法看起來像這樣：
// variables
string uI, cdtitle, genre;
int size = 0, releaseYear, choice, arrInd;
List<string> artistArray = new List<string>();
float condition;
Console.Write("How many CDs do you have lying around your car? ");
uI = Console.ReadLine();
size = Convert.ToInt32(uI);
AudioCD[] cd1 = new AudioCD[size];
for (int i = 0; i < size; i )
{
Console.WriteLine("CD #" (i 1));
Console.Write("*Enter Title: ");
uI = Console.ReadLine();
cdtitle = uI;
Console.WriteLine("*Enter Artists (type -1 when finished):");
int j = 0;
do
{
uI = Console.ReadLine();
if (uI != "-1")
artistArray[j] = uI;
j ;
} while (uI != "-1");
Console.Write("*Enter Genre: ");
uI = Console.ReadLine();
genre = uI;
Console.Write("*Enter Release Year: ");
uI = Console.ReadLine();
releaseYear = Convert.ToInt32(uI);
Console.Write("*Enter Condition: ");
uI = Console.ReadLine();
condition = float.Parse(uI);
Console.Write("\n");
// switch to select which class of cd to put information in
cd1[i] = new AudioCD(cdtitle, artistArray, releaseYear, genre, condition);
artistArray.Clear();
}
bool isPlaying = true;
while (isPlaying)
{
Console.Write("\n");
Console.WriteLine("[Main Menu]");
Console.WriteLine("1) Album Info");
Console.WriteLine("2) Find a CD");
Console.WriteLine("3) Find an artist");
Console.WriteLine("4) Log off");
Console.Write("Choice: ");
uI = Console.ReadLine();
choice = Convert.ToInt32(uI);
switch (choice)
{
case 1:
{
Console.Write("\nWhich CD do you want? ");
uI = Console.ReadLine();
arrInd = Convert.ToInt32(uI);
if (arrInd >= 1 || arrInd <= size)
{
Console.Write(arrInd ". ");
cd1[(arrInd - 1)].printAudioCD();
}
break;
}
case 2:
{
break;
}
case 3:
{
break;
}
case 4:
{
isPlaying = false;
break;
}
default:
{
break;
}
}
}
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