我正在创建一个扑克统计 WinForm 程序来写入玩家信息和 8 周的奖金以及总奖金金额到一个文件并读取该信息以显示在一个表格中。我在将 8 周奖金金额文本框读取到我的数组中时遇到问题。我收到“未设置对象实例的对象引用”。错误。我在下面的代码中指出了我认为错误的来源。我已经包含了表单代码和我的类代码。任何想法我做错了什么？我希望我已经提供了足够的问题背景。提前致谢！！
我的表单代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
using System.Text;
using System.Windows.Forms;
namespace PokerStats
{
public partial class FormPokerStats : Form // FormPokerStats inheriting from class Form
{
// declaring and assigning of variables needed for file read/write
const char DELIM = ',';
const string FILEPATH = @"C:\C# Project Output\";
const string FILENAME = "PokerPlayers.txt";
// declaring instances of Person, Location, and Winnings classes
Person myplayer = new Person();
Location mycasino = new Location();
Winnings mywinnings = new Winnings();
// constructing in/out FileStream/StreamReader/StreamWriter objects
static FileStream inFile = new FileStream(FILEPATH + FILENAME, FileMode.OpenOrCreate, FileAccess.Read, FileShare.ReadWrite);
StreamWriter writer = new StreamWriter(outFile);
static FileStream outFile = new FileStream(FILEPATH + FILENAME, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
StreamReader reader = new StreamReader(inFile);
public FormPokerStats()
{
InitializeComponent();
}
// "Enter/Update Player" tab Enter Player button: read/assign user input, write to file, close file stream
private void buttonEnterPlayer_Click(object sender, EventArgs e)
{
// if directory does not exist, create it
if (!(Directory.Exists(FILEPATH)))
{
// create directory
Directory.CreateDirectory(FILEPATH);
}
try
{
// read user input and assign to variables; test for empty player inputs and reprompt for input, if necessary
// Player Information fields
// if any or all textboxes are left blank
if ((textBoxSSN.Text == String.Empty || textBoxFirstName.Text == String.Empty || textBoxLastName.Text == String.Empty
|| textBoxCasinoName.Text == String.Empty || textBoxCasinoState.Text == String.Empty) ||
(textBoxSSN.Text == String.Empty && textBoxFirstName.Text == String.Empty && textBoxLastName.Text == String.Empty
&& textBoxCasinoName.Text == String.Empty && textBoxCasinoState.Text == String.Empty))
{
MessageBox.Show("Please complete all player information fields.", "Input Error!");
}
else
{
// if all textboxes are completed, assign to variables
myplayer.SocialSecurityNumber = textBoxSSN.Text;
myplayer.FirstName = textBoxFirstName.Text;
myplayer.LastName = textBoxLastName.Text;
mycasino.CasinoName = textBoxCasinoName.Text;
mycasino.CasinoState = textBoxCasinoState.Text;
// writing record to text file
writer.WriteLine(myplayer.ToString() + mycasino.ToString());
// if record is successfully written, display messagebox
MessageBox.Show("Wrote " + myplayer.FirstName.ToString() + ' ' + myplayer.LastName.ToString() + " to file with winnings totaling " + mywinnings.TotalWinnings.ToString("C2") + ".", "File Written");
}
***************************ERROR HERE***************************
// read weekly winnings input and assign to appropriate array position; test for empty inputs and assign default value of 0 if empty
// Week1
if (textBoxWeek1Winnings.Text == String.Empty)
{
mywinnings.ReadWinningsIntoArray("0", 0);
}
else mywinnings.ReadWinningsIntoArray(textBoxWeek1Winnings.Text, 0);
//// Week2
//if (textBoxWeek2Winnings.Text == String.Empty)
//{
// mywinnings.ReadWinningsIntoArray("0", 1);
//}
//else mywinnings.ReadWinningsIntoArray(textBoxWeek2Winnings.Text, 1);
//// Week3
//if (textBoxWeek3Winnings.Text == String.Empty)
//{
// mywinnings.ReadWinningsIntoArray("0", 2);
//}
//else mywinnings.ReadWinningsIntoArray(textBoxWeek3Winnings.Text, 2);
//// Week4
//if (textBoxWeek2Winnings.Text == String.Empty)
//{
// mywinnings.ReadWinningsIntoArray("0", 3);
//}
//else mywinnings.ReadWinningsIntoArray(textBoxWeek1Winnings.Text, 3);
//// Week5
//if (textBoxWeek2Winnings.Text == String.Empty)
//{
// mywinnings.ReadWinningsIntoArray("0", 4);
//}
//else mywinnings.ReadWinningsIntoArray(textBoxWeek1Winnings.Text, 4);
//// Week6
//if (textBoxWeek2Winnings.Text == String.Empty)
//{
// mywinnings.ReadWinningsIntoArray("0", 5);
//}
//else mywinnings.ReadWinningsIntoArray(textBoxWeek1Winnings.Text, 5);
//// Week7
//if (textBoxWeek2Winnings.Text == String.Empty)
//{
// mywinnings.ReadWinningsIntoArray("0", 6);
//}
//else mywinnings.ReadWinningsIntoArray(textBoxWeek1Winnings.Text, 6);
//// Week8
//if (textBoxWeek2Winnings.Text == String.Empty)
//{
// mywinnings.ReadWinningsIntoArray("0", 7);
//}
//else mywinnings.ReadWinningsIntoArray(textBoxWeek1Winnings.Text, 7);
//// calculate total winnings by summing WeeklyWinnings array values and assigning to TotalWinnings
//mywinnings.TotalWinnings = mywinnings.WeeklyWinnings.Sum();
}
catch (FormatException)
{
// if format exception is thrown in try, display messagebox with message
MessageBox.Show("Winnings must be entered at xx.xx (e.g. 34.56).", "Input Error!");
}
catch (Exception f)
{
// if exception is thrown in try, display messagebox with message
MessageBox.Show(f.Message, "Error!");
}
// clear form textboxes
ClearTextBoxes();
writer.Close();
}
// "Enter/Update Player" tab Exit button: closes file streams and quits the application
private void buttonExit_Click(object sender, EventArgs e)
{
// closing file streams
reader.Close();
inFile.Close();
writer.Close();
outFile.Close();
// close application
Application.Exit();
}
// "Player List" tab View Player Winnings button: read file records, display records sorted by total winnings descending
private void buttonRead_Click(object sender, EventArgs e)
{
// if file exists
if (!(File.Exists(FILEPATH + FILENAME)))
{
// if file does not exist, display messagebox
MessageBox.Show("File does not exist.", "File Does Not Exist!");
}
else
{
string[] fields;
// read first record in file
string recordIn = reader.ReadLine();
listBoxOutputRecords.Items.Add("First Name\tLast Name\tCasino Name\tCasino State\tTotal Winnings\t");
while (recordIn != null)
{
// split record into array and assign
fields = recordIn.Split(DELIM);
myplayer.SocialSecurityNumber = fields[0];
myplayer.FirstName = fields[1];
myplayer.LastName = fields[2];
mycasino.CasinoName = fields[3];
mycasino.CasinoState = fields[4];
// output record to listbox
listBoxOutputRecords.Items.Add(myplayer.FirstName + "\t\t" + myplayer.LastName + "\t\t" + mycasino.CasinoName + "\t\t" + mycasino.CasinoState + "\t\t");
// read next record in file
recordIn = reader.ReadLine();
}
}
// return file position to 0
inFile.Seek(0, SeekOrigin.Begin);
}
// "Player List" tab Exit button: call buttonExit_Click method
private void buttonExit2_Click(object sender, EventArgs e)
{
// call buttonExit_Click method
buttonExit_Click(sender, e);
}
// method to clear listbox items when "Player List" tab is left
private void tabPagePlayerList_Leave(object sender, EventArgs e)
{
// clear listbox items
listBoxOutputRecords.Items.Clear();
}
// method to clear textbox controls
private void ClearTextBoxes()
{
Action<Control.ControlCollection> func = null;
func = (controls) =>
{
foreach (Control control in controls)
if (control is TextBox)
(control as TextBox).Clear();
else
func(control.Controls);
};
func(Controls);
}
}
}
我的班级代码：
class Person
{
// SocialSecurityNumber, FirstName, LastName properties
public string SocialSecurityNumber { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
// overridden ToString() method to return string output
public override string ToString()
{
return (SocialSecurityNumber + ',' + FirstName + ',' + LastName + ',');
}
}
// Location class
class Location
{
// CasinoName and CasinoState properties
public string CasinoName { get; set; }
public string CasinoState { get; set; }
// overridden ToString() method to return string output
public override string ToString()
{
return (CasinoName + ',' + CasinoState + ',');
}
}
// Winnings class
class Winnings
{
double[] weeklyWinnings = new double[8];
// WeeklyWinnings and TotalWinnings properties
public double[] WeeklyWinnings { get; set; }
public double TotalWinnings { get; set; }
// overridden ToString() method to return string output
public override string ToString()
{
return ( WeeklyWinnings[0].ToString("C2") + ','
+ WeeklyWinnings[1].ToString("C2") + ','
+ WeeklyWinnings[2].ToString("C2") + ','
+ WeeklyWinnings[3].ToString("C2") + ','
+ WeeklyWinnings[4].ToString("C2") + ','
+ WeeklyWinnings[5].ToString("C2") + ','
+ WeeklyWinnings[6].ToString("C2") + ','
+ WeeklyWinnings[7].ToString("C2") + ','
+ TotalWinnings.ToString("C2"));
}
// method to read textbox winnings inputs into the array
public void ReadWinningsIntoArray(string textBoxText, int position)
{
double value;
if (double.TryParse(textBoxText, out value))
WeeklyWinnings[position] = Convert.ToDouble(value);
}
}