我似乎在我试图为学校制作的一个项目中遇到了一些障碍。我想创建一个新类来接收数据并获得总数以发送到新屏幕。好吧，我做了我们在课堂上做的同样的事情，但不同的是，这是来自一个文本框，这次我需要移动的数据没有文本框，所以我尝试的方式给了我一个错误。这是我到目前为止得到的：
public StudentSelection()
{
InitializeComponent();
}
public decimal firstCounter;
public decimal secondCounter;
public decimal finalCounter;
struct StudentScores
{
public string StuId;
public decimal TestOne;
public decimal TestTwo;
public decimal Final;
}
StudentScores[] allStudentScores = new StudentScores[10];
// class level array to hold 10 products - read in from a file
private void StudentSelection_Load(object sender, EventArgs e)
{
// read products file into products structure array
try
{
// ALWAYS initialize a structure array before using the array
// before adding, changing, etc.
for (int x = 0; x < 10; x++)
{
allStudentScores[x].StuId = "";
allStudentScores[x].TestOne = 0;
allStudentScores[x].TestTwo = 0;
allStudentScores[x].Final = 0;
}
int arrayIndex = 0; // needed for incrementing index value of the array
// when reading file into array
// now read file into the array after initialization
StreamReader inputFile;
string lineofdata; // used to hold each line of data read in from the file
string[] ProductStringArray = new string[4]; // 6 element string array to hold
// each "field" read from every line in file
inputFile = File.OpenText("StudentScores.txt"); // open for reading
while (!inputFile.EndOfStream) //keep reading until end of file
{
lineofdata = inputFile.ReadLine(); // ReadLine() reads an entire row of data from file
ProductStringArray = lineofdata.Split(','); //each field is separated by ';'
allStudentScores[arrayIndex].StuId = ProductStringArray[0]; // add first element of array to first column of allProducts
allStudentScores[arrayIndex].TestOne = decimal.Parse(ProductStringArray[1]);
firstCounter += allStudentScores[arrayIndex].TestOne;
allStudentScores[arrayIndex].TestTwo = decimal.Parse(ProductStringArray[2]);
secondCounter += allStudentScores[arrayIndex].TestTwo;
allStudentScores[arrayIndex].Final = decimal.Parse(ProductStringArray[3]);
finalCounter += allStudentScores[arrayIndex].Final;
StudentListView.Items.Add(ProductStringArray[0]);
arrayIndex++; // increment so NEXT row is updated with next read
}
//close the file
inputFile.Close();
}
catch (Exception anError)
{
MessageBox.Show(anError.Message);
}
}
private void NextButton_Click(object sender, EventArgs e)
{
decimal firstResult, secondResult, finalResult, stuOne, stuTwo, stuThree;
string stuName;
// call the method in our datatier class
decimal.TryParse(firstCounter, out firstResult);
decimal.TryParse(secondCounter, out secondResult);
decimal.TryParse(finalCounter, out finalResult);
DataTier.AddOurNumbers(firstResult, secondResult, finalResult);
DataTier.StudentData(stuName, stuOne, stuTwo, stuThree);
// now hide this window and display a third window with the total
this.Hide();
// display third window
ScoreScreen aScoreScreen = new ScoreScreen();
aScoreScreen.Show();
}
}
和我的新课
class DataTier
{
// public static variable available to all windows
public static decimal firstTotal, secondTotal, finalTotal, stuTestOne, stuTestTwo, stuTestThree;
// static is not associated with any object
public static string stuIDCode;
// create a public method to access from all windows
public static void AddOurNumbers(decimal NumOne, decimal NumTwo, decimal numThree)
{
// devide to get an average
firstTotal = NumOne / 10;
secondTotal = NumTwo / 10;
finalTotal = numThree / 10;
}
public static void StudentData(string name, decimal testOne, decimal testTwo, decimal testThree)
{
stuIDCode = name;
stuTestOne = testOne;
stuTestTwo = testTwo;
stuTestThree = testThree;
}
}
错误出现在小数点后三位。TryParse 部分，我不知道为什么它不起作用，除了错误说“无法从十进制转换为字符串”。任何帮助将不胜感激。