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我对编程非常陌生，所以请原谅我，如果这是一个简单的修复。对于我的字符串变量“city”，我始终得到一个错误“使用未分配的局部变量”。令我困惑的是，我也有一个名为“centreName”的字符串变量，即使它没有被初始化也不会引发相同的错误。在C＃中出现错误“使用未分配的局部变量”
这个程序的重点是让用户输入科学中心的名称和它所在的城市的数据。我尝试初始化“城市”变量string city = null和string city = ""，但是当我运行程序，输出显示为空白，而不是用户输入的内容。我的“centreName”变种不是这种情况。
我将包括我正在使用的两个类的编码。请忽略我的方法，因为我还没有调整它们以适合此程序。它们是我以前使用的较旧的方法，编码在此不适用。
这是我遇到了错误的类：
class ScienceCentreApp
{
static void Main(string[] args)
{
string centreName;
string city;
decimal ticketPrice = 0;
int visitorCnt;
string[] dArray = new String[5];
int[] adultVisitors = new int[5];
decimal[] totalRevenue = new decimal[5];
char enterMoreData = 'Y';
ScienceCentreVisitation scv;
do
{
visitorCnt = GetData(out centreName, city, ticketPrice, dArray, adultVisitors, totalRevenue);
scv = new ScienceCentreVisitation(centreName, city, ticketPrice, dArray, adultVisitors, totalRevenue);
Console.Clear();
Console.WriteLine(scv);
Console.Write("\n\n\n\nDo you want to enter more data - " +
"(Enter y or n)? ");
if (char.TryParse(Console.ReadLine(), out enterMoreData) == false)
Console.WriteLine("Invalid data entered - " +
"No recorded for your respones");
} while (enterMoreData == 'y' || enterMoreData == 'y');
Console.ReadKey();
}
public static int GetData(out string centreName, string city, decimal ticketPrice, string[] dArray, int[] adultVisitors, decimal[] totalRevenue)
{
int i,
loopCnt;
Console.Clear();
Console.Write("Name of Centre: ");
centreName = Console.ReadLine();
Console.Write("City: ");
city = Console.ReadLine();
Console.Write("Ticket Price: ");
string inValue = Console.ReadLine();
ticketPrice = Convert.ToDecimal(inValue);
Console.Write("How many records for {0}? ", centreName);
string inValue1 = Console.ReadLine();
if (int.TryParse(inValue1, out loopCnt) == false)
Console.WriteLine("Invalid data entered - " +
"0 recorded for number of records");
for (i = 0; i < loopCnt; i++)
{
Console.Write("\nDate (mm/dd/yyyy): ");
dArray[i] = Console.ReadLine();
if (dArray[i] == "")
{
Console.WriteLine("No date entered - " +
"Unknown recorded for visits");
dArray[i] = "Unknown";
}
Console.Write("Number of One-Day Adult Visitors: ");
inValue1 = Console.ReadLine();
if (int.TryParse(inValue1, out adultVisitors[i]) == false)
Console.WriteLine("Invalid data entered - " +
"0 recorded for adults visited");
}
return i;
}
}
}
这是其他类，首先是呼吁：
class ScienceCentreVisitation
{
private string centreName;
private string city;
private decimal ticketPrice;
private string[] visitDate;
private int[] adultVisitors;
private decimal[] totalRevenue;
//constructors
public ScienceCentreVisitation()
{
}
public ScienceCentreVisitation(string cent)
{
centreName = cent;
}
public ScienceCentreVisitation(string cent, string cit, decimal price, string[] date, int[] visit, decimal[] rev)
{
visitDate = new string[date.Length];
adultVisitors = new int[visit.Length];
totalRevenue = new decimal[rev.Length];
Array.Copy(date, 0, visitDate, 0, date.Length);
Array.Copy(visit, 0, adultVisitors, 0, adultVisitors.Length);
Array.Copy(rev, 0, totalRevenue, 0, rev.Length);
centreName = cent;
city = cit;
ticketPrice = price;
}
//properties
public string CentreName
{
get
{
return centreName;
}
set
{
centreName = value;
}
}
public string City
{
get
{
return city;
}
set
{
city = value;
}
}
public decimal TicketPrice
{
get
{
return ticketPrice;
}
set
{
ticketPrice = value;
}
}
public string[] VisitDate
{
get
{
return visitDate;
}
set
{
visitDate = value;
}
}
public int[] AdultVisitors
{
get
{
return adultVisitors;
}
set
{
adultVisitors = value;
}
}
public decimal[] TotalRevenue
{
get
{
return totalRevenue;
}
set
{
totalRevenue = value;
}
}
//methods
public decimal CalculateTotalRevenue()
{
decimal totalRev;
int cntOfValidEntries;
int total = 0;
foreach (int c in adultVisitors)
total += c;
cntOfValidEntries = TestForZeros();
totalRev = (decimal)total/cntOfValidEntries;
return totalRev;
}
public int TestForZeros()
{
int numberOfTrueVisits = 0;
foreach (int cnt in adultVisitors)
if (cnt != 0)
numberOfTrueVisits++;
return numberOfTrueVisits;
}
public int GetIndexOfLeastVisited()
{
int minVisIndex = 0;
for (int i = 1; i < adultVisitors.Length; i++)
if (adultVisitors[i] > adultVisitors[minVisIndex])
minVisIndex = i;
return minVisIndex;
}
public int GetLeastVisited()
{
return adultVisitors[GetIndexOfLeastVisited()];
}
public string GetDateWithLeastVisited()
{
return visitDate[GetIndexOfLeastVisited()];
}
public int GetIndexOfMostRevenue()
{
int maxRevIndex = 0;
for (int i = 1; i < totalRevenue.Length; i++)
if (totalRevenue[i] > totalRevenue[maxRevIndex])
maxRevIndex = i;
return maxRevIndex;
}
public decimal GetMostRevenue()
{
return totalRevenue[GetIndexOfMostRevenue()];
}
public string GetDateWithMostRevenue()
{
return visitDate[GetIndexOfMostRevenue()];
}
public override string ToString()
{
return "Name of Centre: " + centreName +
"\nCity: " + city +
"\nDate of Least One-Day Adult Visitors:\t\t" + GetDateWithLeastVisited() +
"\nNumber of Least One-Day Adult Visitors: \t\t" + GetLeastVisited() +
"\nDate of Most Total Revenue Collected:\t\t" + GetDateWithMostRevenue() +
"\nHighest Total Revenue Collected:\t\t" + GetMostRevenue();
}
}
}
提前致谢！
它永远不会被分配一个值 – Plutonix 2015-04-04 15:47:29
局部变量在使用前必须完全初始化。 – chomba 2015-04-04 15:48:18
'centreName'不会引发错误，因为您不是试图使用它的值，而是将它用作'out'变量。 – Banana 2015-04-04 15:48:38