How to append the content in the list box to the text file...?

Hi..i don't know how to append the content of listbox to the exist text file? when i append the content of the listbox to the textfile, the previous data that i clear and not show in the list box will append together with the content of listbox (the only data that i want append to the text file) to the text file. What should i do to not append the previous data that i clear already.
I will upload the coding here.

private void Browse2_Click(object sender, EventArgs e)

{

using (OpenFileDialog fileOpen = new OpenFileDialog())

{

try

{

fileOpen.Filter = "All files(*.*)|*.*";

fileOpen.InitialDirectory = ".\\";

fileOpen.Title = "Open";

if (fileOpen.ShowDialog() == DialogResult.OK)

{

StreamReader sr2 = new StreamReader(fileOpen.FileName, Encoding.Default);

str2 = sr2.ReadToEnd();// read to all the contents of data2

sr2.Close();

ContentBox2.Text = str2;

file2Path.Text = fileOpen.FileName;

}

catch (Exception o)

{

string Message = o.Message + "\n\nCannot open " + fileOpen.FileName;

MessageBox.Show(Message, "Open error", MessageBoxButtons.OK, MessageBoxIcon.Error);

return;

}

if (File.Exists(fileOpen.FileName))

{

StreamReader file2 = null;

try

{

file2 = new StreamReader(fileOpen.FileName);

while ((line2 = file2.ReadLine()) != null)

{

SplitItemList1 = "";

//sb2.AppendLine(line2);

//txtCaseInputs.Text = sb2.ToString().Trim();

line2 = line2.Replace("\r\n"," ");

String[] Split2 = (line2).Split(' ');//split

foreach (string byline in Split2)

{

SplitItemList1 += "\r\n" + byline;

}

//sb3.Append(SplitItemList1);

//MessageBox.Show(sb3.ToString().Trim());

//MessageBox.Show(SplitItemList1.Trim());

txtCaseInputs.Text = SplitItemList1.ToString().Trim();

GenCombItems2();

}

file2.Close();

// MessageBox.Show(sb2.ToString().Trim());

}

catch (Exception o)

{

string Message = o.Message + "\n\nCannot open " + fileOpen.FileName;

MessageBox.Show(Message, "Open error", MessageBoxButtons.OK, MessageBoxIcon.Error);

return;

}

private void GenCombItems2()

{

lbCombinations2.Items.Clear();

int k = 2;

int n = txtCaseInputs.Lines.Length;

// txtNumCombinations.Text = Combination.Choose(n, k).ToString();

Combination c = new Combination(n, k);

string[] result = new string[k];

while (c != null)

{

result = c.ApplyTo(txtCaseInputs.Lines);

StringBuilder sb = new StringBuilder();

for (int i = 0; i < result.Length; ++i)

{

sb.AppendFormat("{0}{1}", result[i], " ");

}

c = c.Successor();

lbCombinations2.Items.Add(sb.ToString().Trim());

}

//txtCaseInputs.Clear();

DisplayResult2();

//MessageBox.Show(ShowResult2.ToString());

}

//String ShowResult2 = "\n";

private void DisplayResult2()

{

foreach (string addItems in lbCombinations2.Items)

{

//MessageBox.Show(sort);

if (!(list1.ContainsKey(addItems)))

{

list1.Add(addItems, 1);

}

else

{

int Count = (int)list1[addItems];

list1[addItems] = Count + 1;

//MessageBox.Show(list1[addItems].ToString());

}

// MessageBox.Show(list1[addItems].ToString());

}

IDictionaryEnumerator enumerator = list1.GetEnumerator();

ListItemCom2.Items.Clear();

while (enumerator.MoveNext())

{

ListItemCom2.Items.Add(enumerator.Key.ToString() + ":" + enumerator.Value.ToString() + "\n");

//ShowResult2 += enumerator.Key.ToString() + ":" + enumerator.Value.ToString() + "\n";

}

// MessageBox.Show(ShowResult2);

FileStream fs2 = new FileStream(@"C:\Users\Fish\Desktop\fyp-coding\Combine1.txt", FileMode.Append, FileAccess.Write, FileShare.Write);//create text file

StreamWriter sw2 = new StreamWriter(fs2, Encoding.Default);

foreach (string item2 in ListItemCom2.Items)

{

//sw2.WriteLine(item2.ToString());// write to the text file

}

sw2.Flush();

sw2.Close();

fs2.Close();

//SaveToTextFile2();

}

Try this

using System.IO;

public partial class Form1 : Form
{
string theFile;
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
bttnAppend.Enabled = false;
}

private void bttnOpen_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
textBox1.Text = openFileDialog1.FileName;
theFile = File.ReadAllText(textBox1.Text);
textBox2.Text = theFile;
bttnAppend.Enabled = true;
}
}

private void bttnAppend_Click(object sender, EventArgs e)
{
bttnAppend.Enabled = false;
using (StreamWriter sw = new StreamWriter(textBox1.Text))
{
sw.Write(theFile );
foreach (string str in listBox1.Items)
{
sw.WriteLine(str);
}
}
textBox2.Clear();
textBox2.Text = File.ReadAllText(textBox1.Text);

}

}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Frogleg15y ago
Try this

using System.IO;

public partial class Form1 : Form
{
string theFile;
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
bttnAppend.Enabled = false;
}

private void bttnOpen_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
textBox1.Text = openFileDialog1.FileName;
theFile = File.ReadAllText(textBox1.Text);
textBox2.Text = theFile;
bttnAppend.Enabled = true;
}
}

private void bttnAppend_Click(object sender, EventArgs e)
{
bttnAppend.Enabled = false;
using (StreamWriter sw = new StreamWriter(textBox1.Text))
{
sw.Write(theFile );
foreach (string str in listBox1.Items)
{
sw.WriteLine(str);
}
}
textBox2.Clear();
textBox2.Text = File.ReadAllText(textBox1.Text);

}

}
0
Suthish Nair15y ago
FileMode

0