|
03-30-2009, 12:23 PM
| #1 |
| Registered User Join Date: Feb 2009
Posts: 4
|  ineccessible due to protection level error Code:
using System;
using System.Windows.Forms;
namespace WindowsApplication2
{
public partial class Form1 : Form
{
protected int TextBoxCount = 5; // number of TextBoxes on Form
//enumeration constants specify textbox indices
public enum TextBoxIndices
{
VIDEOAUDIO,
TITLE,
CATEGORY,
CERTIFICATION,
COPIES
}
//parameterless constructor
public Form1()
{
InitializeComponent();
}
//end constructor
//clear all TExtBoxes
public void ClearTextBoxes()
{
//iterate through every control on form
for (int i = 0; i < Controls.Count; i++)
{
Control myControl = Controls[i]; // get control
//determine wheterh control is textbox
if (myControl is TextBox)
{
//clear text property (set to empty string )
myControl.Text = "";
}//end if
}//end for
}//end method ClearTextBoxes
//set text box values to string array values
public void SetTextBoxValues(string[] values)
{
//determine wethere string array has correct lenght
if (values.Length != TextBoxCount)
{
//throw exception if not correct length
throw (new ApplicationException(" There must be " +
(TextBoxCount + 1) + " string in the array"));
}//end if
//set array values if array has correct lenght
else
{
//seet array values to text box values
videoaudiocodeTextBox.Text = values[(int)TextBoxIndices.VIDEOAUDIO];
titleTextBox.Text = values[(int)TextBoxIndices.TITLE];
categoryTextBox.Text = values[(int)TextBoxIndices.CATEGORY];
certificationTextBox.Text = values[(int)TextBoxIndices.CERTIFICATION];
copiesTextBox.Text = values[(int)TextBoxIndices.COPIES];
}//end else
}//end method SetTExtValues
//return text box values as string array
public string[] GetTextBoxValues()
{
string[] values = new string[TextBoxCount];
//copy text box fields to string array
values[(int)TextBoxIndices.VIDEOAUDIO] = videoaudiocodeTextBox.Text;
values[(int)TextBoxIndices.TITLE] = titleTextBox.Text;
values[(int)TextBoxIndices.CATEGORY] = categoryTextBox.Text;
values[(int)TextBoxIndices.CERTIFICATION] = certificationTextBox.Text;
values[(int)TextBoxIndices.COPIES] = copiesTextBox.Text;
return values;
}
}//end method
}//end class
Code:
using System;
using System.Collections.Generic;
using System.Text;
namespace WindowsApplication2
{
public class Class1
{
private int videoandaudio;
private string title;
private string category;
private string certification;
private int copies;
//parameterless constructor sets members to default values
public Class1()
: this(0, "", "", "", 0)
{
}//end constructor
//overloaded constructor sets members to parameter values
public Class1(int videoandaudioValue, string titleValue, string categoryValue,
string certificationValue, int copiesValue)
{
Videoandaudio = videoandaudioValue;
Title = titleValue;
Category = categoryValue;
Certification = certificationValue;
Copies = copiesValue;
}//end constructor
//property that gets and sets account
public int Videoandaudio
{
get
{
return videoandaudio;
}//end get
set
{
videoandaudio = value;
}//endset
}//end property Videoandaudio
//property that gets and sets title
public string Title
{
get
{
return title;
}//end get
set
{
title = value;
}//endset
}//end property title
//property that gets and sets category
public string Category
{
get
{
return category;
}//end get
set
{
category = value;
}//endset
}//end property category
//property that gets and sets certification
public string Certification
{
get
{
return certification;
}//end get
set
{
certification = value;
}//endset
}//end property certification
//property that gets and sets coopies
public int Copies
{
get
{
return copies;
}//end get
set
{
copies = value;
}//endset
}//end property copies
}//end class
}
Code:
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace WindowsApplication2
{
public partial class Class2 : Form1
{
private StreamWriter fileWriter; // writes datea to text file
private FileStream output; // maintains connection to file
//pramaterless constructor
public Class2()
{
InitializeComponent(); ----this has protection level
error
}//end constructor
//event handelr for Save button
private void saveButton_Click(object sender, EventArgs e)
{
//create dialog box enabling uer to save file
SaveFileDialog fileChooser = new SaveFileDialog();
DialogResult result = fileChooser.ShowDialog();
string fileName; // name of file to save data
fileChooser.CheckFileExists = false; // allow user to create file
//exit event handler if user clicked "Cancel"
if (result == DialogResult.Cancel)
return;
fileName = fileChooser.FileName; // get specified file name
//show error if user specified invalid file
if (fileName == "" || fileName == null)
MessageBox.Show(" Invalid File Name", "Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
else
{
//save file via filestream if user specified valid file
try
{
//open ifle with write access
output = new FileStream(fileName,
FileMode.OpenOrCreate, FileAccess.Write);
//sets file to where data is written
fileWriter = new StreamWriter(output);
//disable save button and enable enter button
saveButton.Enabled = false;
enterButton.Enabled = true; ---these two have protection
error too
}//end try
//handle exception if ther is a problem opening the file
catch (IOException)
{
//notify user if file doesnot exist
MessageBox.Show("Error opening file", "error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}//end catch
}//end else
}//end method saveButton_click
//handler for enterButton_click
private void enterButton_Click(object sender, EventArgs e)
{
//store Textbox values string array
string[] values = GetTextBoxValues();
//record containg textbox values to serialize
Class1 class1 = new Class1();
//determine whether textbox account field is empty
if ( values [ ( int ) TextBoxIndices.VIDEOAUDIO ] != "" )
{
// store textbox values in record and serialize record
try
{
// get video and audio code value from textbox
int videoandaudioCode = Int32.Parse( values[ ( int ) TextBoxIndices.VIDEOAUDIO ] );
//determine wheterh videoandaudioCode is valid
if ( videoandaudioCode > 0 )
{
//store textbox fields in record
class1.Videoandaudio = videoandaudioCode;
class1.Title = values[ ( int ) TextBoxIndices.TITLE ];
class1.Category = values[ ( int ) TextBoxIndices.CATEGORY ];
class1.Certification = values[ ( int ) TextBoxIndices.CERTIFICATION ];
class1.Copies = Int32.Parse( values[ ( int ) TextBoxIndices.COPIES ]);
}//end if
else{
//notify user if invalid video and audio code
MessageBox.Show( " invalid code ", "error",
MessageBoxButtons.OK, MessageBoxIcon.Error ) ;
}//end else
}//endtry
//notify user if error occurs in seialization
catch ( IOException )
{
MessageBox.Show( "error writing to file" , "error",
MessageBoxButtons.OK, MessageBoxIcon.Error );
}//end catch
//notify user if eror occurs regarding parameter format
catch ( FormatException )
{
MessageBox.Show( "invalid format", "error",
MessageBoxButtons.OK, MessageBoxIcon.Error );
}//end catch
}//end if
ClearTextBoxes(); //clear textbox values
}//end method enter button_ click
//handler for exitButton Click
private void exitButton_Click(object sender, EventArgs e)
{
//dtermine wheteher file exists
if (output != null)
{
try
{
fileWriter.Close(); //close streamwriter
output.Close(); //close file
}// end try
//notify user of error closing file
catch (IOException)
{
MessageBox.Show(" cannot close file", "error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}//end catch
}//end if
Application.Exit();
}//end method
}// end class
}
i based this code from my book for my project theyre pretty the same except for the names...now before i put the code for the class2 this program were running good...on the class2 there are errors saying "unaccessible due to protection level" and the underlined words are InitializeComponent(); ,saveButton.Enabled = false; and enterButton.Enabled Code:
............. public Class2()
{
InitializeComponent(); ----this has protection level
error
}//end constructor
//event handelr for Save button
private void saveButton_Click(object sender, EventArgs e)
{
//create dialog box enabling uer to save file
SaveFileDialog fileChooser = new SaveFileDialog();
DialogResult result = fileChooser.ShowDialog();
string fileName; // name of file to save data
fileChooser.CheckFileExists = false; // allow user to create file
//exit event handler if user clicked "Cancel"
if (result == DialogResult.Cancel)
return;
fileName = fileChooser.FileName; // get specified file name
//show error if user specified invalid file
if (fileName == "" || fileName == null)
MessageBox.Show(" Invalid File Name", "Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
else
{
//save file via filestream if user specified valid file
try
{
//open ifle with write access
output = new FileStream(fileName,
FileMode.OpenOrCreate, FileAccess.Write);
//sets file to where data is written
fileWriter = new StreamWriter(output);
//disable save button and enable enter button
saveButton.Enabled = false;
enterButton.Enabled = true; ---these two have protection
error too
}//end try
.................
i think form1 has something to do with this with the word "protective int" iam not sure can someone explain why is this happen thx Last edited by dropper166; 03-30-2009 at 09:04 PM. |
| dropper166 is offline |  |
|
03-30-2009, 04:04 PM
| #2 |
| Registered User Join Date: Mar 2009 Location: england
Posts: 76
| You've not actually stated what the error message says, or which particular line of the Dispose method it is crashing on. Nor have you said when the error occurs: when the program first starts... when it's closing? In my experience Dispose will throw an exception when a control within the form's collection has been set to null but still exists within the collection, but without further information it's impossible to say exactly why it's happening to you. |
| theoobe is offline | |
|
03-30-2009, 11:53 PM
| #3 |
| the hat of redundancy hat  Join Date: Aug 2001 Location: Hannover, Germany
Posts: 2,754
| The lines you underlined are probably accessing private members of your base class (Form1). You cannot do this. Either make them protected (not recommended) or write properties for Form1 that are public or protected and in turn set those private variables.
__________________ hth -nv She was so Blonde, she spent 20 minutes looking at the orange juice can because it said "Concentrate." When in doubt, read the FAQ. Then ask a smart question. |
| nvoigt is offline | |
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