C# 错误发生在特定代码行之后
我的错误是：C# 错误发生在特定代码行之后,c#,winforms,C#,Winforms,我的错误是：对象引用未设置为对象的实例。我不认为这是导致问题的实际行，但它出现了： mainWindow.ChangeTextBox = stringBuilder.ToString(); 似乎它会在代码的第一行上紧接着出现错误： string encrypted = en.Encrypt(stringBuilder.ToString(), user, pass); string decrypted = en.Decrypt(encrypted, user, p
对象引用未设置为对象的实例。mainWindow.ChangeTextBox = stringBuilder.ToString();
string encrypted = en.Encrypt(stringBuilder.ToString(), user, pass);
string decrypted = en.Decrypt(encrypted, user, pass);
using System;
using System.Windows.Forms;
// Needed to be used with StringBuilder
using System.Text;
// Needed to be used with ArrayList.
using System.Collections;
namespace Store_Passwords_and_Serial_Codes
{
public partial class AddEntryWindow : Form
{
string user, pass;
// Initializind ArrayList to store all data needed to be added or retrived.
private ArrayList addedEntry = new ArrayList();
// Initializing MainWindow form.
MainWindow mainWindow;
// Making authentication possible.
// AuthenticateUser authenticateUser = new AuthenticateUser();
EncryptDecrypt en = new EncryptDecrypt();
// Default constructor to initialize the form.
public AddEntryWindow()
{
InitializeComponent();
}
public AddEntryWindow(string user, string pass)
: this() // important!
{
this.user = user;
this.pass = pass;
}
public AddEntryWindow(MainWindow viaParameter) : this()
{
mainWindow = viaParameter;
}
private void AddEntryWindow_Load(object sender, EventArgs e)
{ }
private void btnAddEntry_Click(object sender, EventArgs e)
{
// Making sure that type is selected.
if (cmbType.SelectedIndex == -1)
{
MessageBox.Show("Please select entry type!", "Error!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
// Each field must be filled for specified type.
// Here we are checking if all fields were filled.
else if ((cmbType.SelectedIndex == 0 && (txtUserName.Text == string.Empty || txtPassword.Text == string.Empty)) ||
(cmbType.SelectedIndex == 1 && (txtURL.Text == string.Empty || txtPassword.Text == string.Empty)) ||
(cmbType.SelectedIndex == 2 && (txtSoftwareName.Text == string.Empty || txtSerialCode.Text == string.Empty)))
{
MessageBox.Show("Please fill all the fields!", "Error!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
int totalEntries = 0;
if(cmbType.SelectedIndex == 0)
addedEntry.Add(new AddPC(cmbType.Text,
txtUserName.Text, txtPassword.Text));
else if(cmbType.SelectedIndex == 1)
addedEntry.Add(new AddWebSite(cmbType.Text,
txtUserName.Text, txtPassword.Text, txtURL.Text));
else if(cmbType.SelectedIndex == 2)
addedEntry.Add(new AddSerialCode(cmbType.Text,
txtSoftwareName.Text, txtSerialCode.Text));
StringBuilder stringBuilder = new StringBuilder();
foreach (var list in addedEntry)
{
if (list is AddPC)
{
totalEntries++;
AddPC tmp = (AddPC)list;
stringBuilder.Append(tmp.ToString());
}
else if (list is AddWebSite)
{
totalEntries++;
AddWebSite tmp = (AddWebSite)list;
stringBuilder.Append(tmp.ToString());
}
else if (list is AddSerialCode)
{
totalEntries++;
AddSerialCode tmp = (AddSerialCode)list;
stringBuilder.Append(tmp.ToString());
}
}
MessageBox.Show(user + pass);
string encrypted = en.Encrypt(stringBuilder.ToString(), user, pass);
string decrypted = en.Decrypt(encrypted, user, pass);
//+ Environment.NewLine +
//encrypted + Environment.NewLine + decrypted);
mainWindow.ChangeTextBox = stringBuilder.ToString();
//mainWindow.tsslStatus.Text = "A total of " + totalEntries + " entries added.";
// Clearing all fields.
//ClearFields();
}
}
private void btnClear_Click(object sender, EventArgs e){}
private void btnClose_Click(object sender, EventArgs e){}
private void cmbType_SelectedIndexChanged(object sender, EventArgs e){}
}
}
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
namespace Store_Passwords_and_Serial_Codes
{
class EncryptDecrypt
{
string input, userName, password;
RijndaelManaged Crypto = new RijndaelManaged();
public EncryptDecrypt()
{
}
public EncryptDecrypt(string input, string userName, string password)
{
this.input = input;
this.userName = userName;
this.password = password;
}
public string Encrypt(string PlainText, string pass, string usrName)
{
string HashAlgorithm = "SHA1";
int PasswordIterations = 2;
string InitialVector = "OFRna73m*aze01xY";
int KeySize = 256;
this.input = PlainText;
if (string.IsNullOrEmpty(PlainText))
return "";
byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
byte[] SaltValueBytes = Encoding.ASCII.GetBytes(usrName);
byte[] PlainTextBytes = Encoding.UTF8.GetBytes(PlainText);
PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(pass, SaltValueBytes, HashAlgorithm, PasswordIterations);
byte[] KeyBytes = DerivedPassword.GetBytes(KeySize / 8);
RijndaelManaged SymmetricKey = new RijndaelManaged();
SymmetricKey.Mode = CipherMode.CBC;
byte[] CipherTextBytes = null;
using (ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(KeyBytes, InitialVectorBytes))
{
using (MemoryStream MemStream = new MemoryStream())
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write))
{
CryptoStream.Write(PlainTextBytes, 0, PlainTextBytes.Length);
CryptoStream.FlushFinalBlock();
CipherTextBytes = MemStream.ToArray();
MemStream.Close();
CryptoStream.Close();
}
}
}
SymmetricKey.Clear();
return Convert.ToBase64String(CipherTextBytes);
}
public string Decrypt(string CipherText, string pass, string usrName)
{
string HashAlgorithm = "SHA1";
int PasswordIterations = 2;
string InitialVector = "OFRna73m*aze01xY";
int KeySize = 256;
if (string.IsNullOrEmpty(CipherText))
return "";
byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
byte[] SaltValueBytes = Encoding.ASCII.GetBytes(usrName);
byte[] CipherTextBytes = Convert.FromBase64String(CipherText);
PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(pass, SaltValueBytes, HashAlgorithm, PasswordIterations);
byte[] KeyBytes = DerivedPassword.GetBytes(KeySize / 8);
RijndaelManaged SymmetricKey = new RijndaelManaged();
SymmetricKey.Mode = CipherMode.CBC;
byte[] PlainTextBytes = new byte[CipherTextBytes.Length];
int ByteCount = 0;
using (ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(KeyBytes, InitialVectorBytes))
{
using (MemoryStream MemStream = new MemoryStream(CipherTextBytes))
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Decryptor, CryptoStreamMode.Read))
{
ByteCount = CryptoStream.Read(PlainTextBytes, 0, PlainTextBytes.Length);
MemStream.Close();
CryptoStream.Close();
}
}
}
SymmetricKey.Clear();
return Encoding.UTF8.GetString(PlainTextBytes, 0, ByteCount);
}
}
}
using System;
using System.Windows.Forms;
// Needed to be used with StringBuilder
using System.Text;
// Needed to be used with ArrayList.
using System.Collections;
namespace Store_Passwords_and_Serial_Codes
{
public partial class AddEntryWindow : Form
{
string user, pass;
// Initializind ArrayList to store all data needed to be added or retrived.
private ArrayList addedEntry = new ArrayList();
// Initializing MainWindow form.
MainWindow mainWindow;
// Making authentication possible.
// AuthenticateUser authenticateUser = new AuthenticateUser();
EncryptDecrypt en = new EncryptDecrypt();
// Default constructor to initialize the form.
public AddEntryWindow()
{
InitializeComponent();
}
public AddEntryWindow(string user, string pass)
: this() // important!
{
this.user = user;
this.pass = pass;
}
public AddEntryWindow(MainWindow viaParameter) : this()
{
mainWindow = viaParameter;
}
private void AddEntryWindow_Load(object sender, EventArgs e)
{ }
private void btnAddEntry_Click(object sender, EventArgs e)
{
// Making sure that type is selected.
if (cmbType.SelectedIndex == -1)
{
MessageBox.Show("Please select entry type!", "Error!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
// Each field must be filled for specified type.
// Here we are checking if all fields were filled.
else if ((cmbType.SelectedIndex == 0 && (txtUserName.Text == string.Empty || txtPassword.Text == string.Empty)) ||
(cmbType.SelectedIndex == 1 && (txtURL.Text == string.Empty || txtPassword.Text == string.Empty)) ||
(cmbType.SelectedIndex == 2 && (txtSoftwareName.Text == string.Empty || txtSerialCode.Text == string.Empty)))
{
MessageBox.Show("Please fill all the fields!", "Error!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
int totalEntries = 0;
if(cmbType.SelectedIndex == 0)
addedEntry.Add(new AddPC(cmbType.Text,
txtUserName.Text, txtPassword.Text));
else if(cmbType.SelectedIndex == 1)
addedEntry.Add(new AddWebSite(cmbType.Text,
txtUserName.Text, txtPassword.Text, txtURL.Text));
else if(cmbType.SelectedIndex == 2)
addedEntry.Add(new AddSerialCode(cmbType.Text,
txtSoftwareName.Text, txtSerialCode.Text));
StringBuilder stringBuilder = new StringBuilder();
foreach (var list in addedEntry)
{
if (list is AddPC)
{
totalEntries++;
AddPC tmp = (AddPC)list;
stringBuilder.Append(tmp.ToString());
}
else if (list is AddWebSite)
{
totalEntries++;
AddWebSite tmp = (AddWebSite)list;
stringBuilder.Append(tmp.ToString());
}
else if (list is AddSerialCode)
{
totalEntries++;
AddSerialCode tmp = (AddSerialCode)list;
stringBuilder.Append(tmp.ToString());
}
}
MessageBox.Show(user + pass);
string encrypted = en.Encrypt(stringBuilder.ToString(), user, pass);
string decrypted = en.Decrypt(encrypted, user, pass);
//+ Environment.NewLine +
//encrypted + Environment.NewLine + decrypted);
mainWindow.ChangeTextBox = stringBuilder.ToString();
//mainWindow.tsslStatus.Text = "A total of " + totalEntries + " entries added.";
// Clearing all fields.
//ClearFields();
}
}
private void btnClear_Click(object sender, EventArgs e){}
private void btnClose_Click(object sender, EventArgs e){}
private void cmbType_SelectedIndexChanged(object sender, EventArgs e){}
}
}
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
namespace Store_Passwords_and_Serial_Codes
{
class EncryptDecrypt
{
string input, userName, password;
RijndaelManaged Crypto = new RijndaelManaged();
public EncryptDecrypt()
{
}
public EncryptDecrypt(string input, string userName, string password)
{
this.input = input;
this.userName = userName;
this.password = password;
}
public string Encrypt(string PlainText, string pass, string usrName)
{
string HashAlgorithm = "SHA1";
int PasswordIterations = 2;
string InitialVector = "OFRna73m*aze01xY";
int KeySize = 256;
this.input = PlainText;
if (string.IsNullOrEmpty(PlainText))
return "";
byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
byte[] SaltValueBytes = Encoding.ASCII.GetBytes(usrName);
byte[] PlainTextBytes = Encoding.UTF8.GetBytes(PlainText);
PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(pass, SaltValueBytes, HashAlgorithm, PasswordIterations);
byte[] KeyBytes = DerivedPassword.GetBytes(KeySize / 8);
RijndaelManaged SymmetricKey = new RijndaelManaged();
SymmetricKey.Mode = CipherMode.CBC;
byte[] CipherTextBytes = null;
using (ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(KeyBytes, InitialVectorBytes))
{
using (MemoryStream MemStream = new MemoryStream())
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write))
{
CryptoStream.Write(PlainTextBytes, 0, PlainTextBytes.Length);
CryptoStream.FlushFinalBlock();
CipherTextBytes = MemStream.ToArray();
MemStream.Close();
CryptoStream.Close();
}
}
}
SymmetricKey.Clear();
return Convert.ToBase64String(CipherTextBytes);
}
public string Decrypt(string CipherText, string pass, string usrName)
{
string HashAlgorithm = "SHA1";
int PasswordIterations = 2;
string InitialVector = "OFRna73m*aze01xY";
int KeySize = 256;
if (string.IsNullOrEmpty(CipherText))
return "";
byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
byte[] SaltValueBytes = Encoding.ASCII.GetBytes(usrName);
byte[] CipherTextBytes = Convert.FromBase64String(CipherText);
PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(pass, SaltValueBytes, HashAlgorithm, PasswordIterations);
byte[] KeyBytes = DerivedPassword.GetBytes(KeySize / 8);
RijndaelManaged SymmetricKey = new RijndaelManaged();
SymmetricKey.Mode = CipherMode.CBC;
byte[] PlainTextBytes = new byte[CipherTextBytes.Length];
int ByteCount = 0;
using (ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(KeyBytes, InitialVectorBytes))
{
using (MemoryStream MemStream = new MemoryStream(CipherTextBytes))
{
using (CryptoStream CryptoStream = new CryptoStream(MemStream, Decryptor, CryptoStreamMode.Read))
{
ByteCount = CryptoStream.Read(PlainTextBytes, 0, PlainTextBytes.Length);
MemStream.Close();
CryptoStream.Close();
}
}
}
SymmetricKey.Clear();
return Encoding.UTF8.GetString(PlainTextBytes, 0, ByteCount);
}
}
}
关于。
mainWindow公共AddEntryWindow（mainWindow viaParameter）公共AddEntryWindow（字符串用户，字符串传递）您可以始终在引发异常的行上放置断点，并检查每个变量。您应该将mainWindow设置为mainWindow的实例 在下面的构造函数中，您没有这样做
public AddEntryWindow(string user, string pass)
: this()
{
this.user = user;
this.pass = pass;
}
public AddEntryWindow(MainWindow viaParameter, string user, string pass)
: this()
{
mainWindow = viaParameter;
this.user = user;
this.pass = pass;
}
我想你是对的。我可能忘记了MainWindow.cs文件中的一些代码。需要再检查一下吗