I have a html document that after being parsed contains only formatted text.I was wondering if it is possible to get its text like I would do if I was mouse-selecting it + copy + paste in new Text Document?
I know that this is possible in Microsoft.Office.Interop where I have .ActiveSelection property that selects the content of the open Word.
I need to find a way to load the html somehowe(maybe in a browser object) and then copy all of its content and assign it to a string.
var doc = new HtmlAgilityPack.HtmlDocument();
var documetText = File.ReadAllText(myhtmlfile.html, Encoding.GetEncoding(1251));
documetText = this.PerformSomeChangesOverDocument(documetText);
doc.LoadHtml(documetText);
var stringWriter = new StringWriter();
AgilityPackEntities.AgilityPack.ConvertTo(doc.DocumentNode, stringWriter);
stringWriter.Flush();
var titleNode = doc.DocumentNode.SelectNodes("//title");
if (titleNode != null)
{
var titleToBeRemoved = titleNode[0].InnerText;
document.DocumentContent = stringWriter.ToString().Replace(titleToBeRemoved, string.Empty);
}
else
{
document.DocumentContent = stringWriter.ToString();
}
and then I return the document object.The problem is that the string is not always formatted as I want it to be
You should be able to just use StreamReader and as you read each line just write it out using StreamWriter
Something like this will readuntil the end of your file and save it to a new one. If you need to do extra logic in the file I have a comment inserted to let you know where to do all that.
private void button4_Click(object sender, EventArgs e)
{
System.IO.StreamWriter writer = new System.IO.StreamWriter("C:\\XXX\\XXX\\XXX\\test2.html");
String line;
using (System.IO.StreamReader reader = new System.IO.StreamReader("C:\\XXX\\XXX\\XXX\\test.html"))
{
//Do until the end
while ((line = reader.ReadLine()) != null) {
//You can insert extra logic here if you need to omit lines or change them
writer.WriteLine(line);
}
//All done, close the reader
reader.Close();
}
//Flush and close the writer
writer.Flush();
writer.Close();
}
You can also save it to a string then just do whatever you want to with it. You can use new lines to keep the same format.
EDIT The below will tke into account your tags
private void button4_Click(object sender, EventArgs e)
{
String line;
String filetext = null;
int count = 0;
using (System.IO.StreamReader reader = new System.IO.StreamReader("C:\\XXXX\\XXXX\\XXXX\\test.html"))
{
while ((line = reader.ReadLine()) != null) {
if (count == 0) {
//No newline since its start
if (line.StartsWith("<")) {
//skip this it is formatted stuff
}
else {
filetext = filetext + line;
}
}
else {
if (line.StartsWith("<"))
{
//skip this it is formatted stuff
}
else
{
filetext = filetext + "\n" + line;
}
}
count++;
}
Trace.WriteLine(filetext);
reader.Close();
}
}
Related
I am trying to replace a specific data field in my csv file but am having issues.
My csv file is structured like:
user, password, role, id,
1, abc, 2, 3
2, def, 2, 4
3, ghi, 5, 5
I can read the file fine but when I want to replace a password using a textbox and button in a windows form I am having issues.
private void resetBtn_Click(object sender, EventArgs e)
{
var encoding = Encoding.GetEncoding("iso-8859-1");
var csvLines = File.ReadAllLines("C:\\Users\\hughesa3\\Desktop\\test environment\\users.csv", encoding);
foreach (var line in csvLines)
{
var values = line.Split(',');
if (values[0].Contains(form2value))
{
values[1] = confirmPass.Text;
}
}
}
Form2value is their username, So what im trying do is: If the first column contains what was entered in form2value it will go to the 2nd column of that row.
I have tried this
var values = line.Split(',');
if (values[0].Contains(form2value))
{
MessageBox.Show(values[1]);
values[1] = confirmPass.Text;
MessageBox.Show(values[1]);
}
}
Just to see if the value is changing and it is but it is also displaying every value[1] when i only want it to if form2value was found.
I tried to explain this as best as I could but if anyone needs more info please let me know.
Does anybody know what I am doing wrong ?
Life would be easier for you if you used a data table..........
Here is an excerp...
DT is a DataTable.
Split the first line of your file and us dt.Columns.Add to add the column headings....
private void AddDataToDataTable()
{
using (StreamReader sr = new StreamReader(new MemoryStream(this.FileContents)))
{
//Igone headings & blank Lines
string line = string.Empty;
while ((line = sr.ReadLine()) != null)
{
//If blank line then skip line
if (line == string.Empty)
{
continue;
}
dt.Rows.Add(line.Split(this.Delimeter));
}
}
}
Hope this helps
You're changing the values internal array you use in your code, not the file itself. In fact you're not writing the file anywhere, just reading it.
You'll need to: Read the file, get the line where the username is (if it exists), then write that specific line with the password.
Here's how you can do it:
private void resetBtn_Click(object sender, EventArgs e)
{
var encoding = Encoding.GetEncoding("iso-8859-1");
var csvLines = File.ReadAllLines("C:\\Users\\hughesa3\\Desktop\\test environment\\users.csv", encoding);
for (int i = 0; i < csvLines.Length; i++)
{
var values = csvLines[i].Split(',');
if (values[0].Contains(form2value))
{
values[1] = confirmPass.Text;
using (FileStream stream = new FileStream("C:\\Users\\hughesa3\\Desktop\\test environment\\users.csv", FileMode.Create))
{
using (StreamWriter writer = new StreamWriter(stream, encoding))
{
for (int currentLine = 0; currentLine < csvLines.Length; ++currentLine)
{
if (currentLine == i)
{
writer.WriteLine(string.Join(",", values));
}
else
{
writer.WriteLine(csvLines[i]);
}
}
writer.Close();
}
stream.Close();
}
}
}
}
I wrote a small function that reads a csv file using textField line by line , edit it a specific field then write it back to a CSV file.
Here is the code :
private void button2_Click(object sender, EventArgs e)
{
String path = #"C:\file.csv";
String dpath = #"C:\file_processed.csv";
List<String> lines = new List<String>();
if (File.Exists(path))
{
using (TextFieldParser parser = new TextFieldParser(path))
{
String line;
parser.HasFieldsEnclosedInQuotes = true;
parser.Delimiters = new string[] { "," };
while ((line = parser.ReadLine()) != null)
{
string[] parts = parser.ReadFields();
if (parts == null)
{
break;
}
if ((parts[12] != "") && (parts[12] != "0"))
{
parts[12] = parts[12].Substring(0, 3);
//MessageBox.Show(parts[12]);
}
lines.Add(line);
}
}
using (StreamWriter writer = new StreamWriter(dpath, false))
{
foreach (String line in lines)
writer.WriteLine(line);
}
MessageBox.Show("CSV file successfully processed ! ");
}
}
The field I want to edit is the 12th one (parts[12]):
for example : if parts[12] = 000,000,234 then change to 000
the file is created the problem is it does not edit the file and half the records are missing. I am hoping someone could point the mistake.
You call both parser.ReadFields() and parser.ReadLine(). Each of them advance the cursor by one. That's why you're missing half the rows. Change the while to:
while(!parser.EndOfData)
Then add parts = parser.ReadFields(); to the end of the loop. Not having this is why you're edit isn't being seen.
You can also remove:
if (parts == null)
{
break;
}
Since you no longer have line, you'll need to use the fields to keep track of your results:
lines.Add(string.Join(",", parts));//handle string escaping fields if needed.
I'm reading a file using C# and class TextReader
TextReader reader = new StreamReader(stream);
string line;
while ((line = reader.ReadLine()) != null)
{
if (someCondition)
{
// I want to change "line" and save it into the file I'm reading from
}
}
In a code there is a question: how do I save a changed line to a file I'm reading from and continue reading?
Fast and dirty solution would be:
TextReader reader = new StreamReader(stream);
string line;
StringBuilder sb = new StringBuilder();
while ((line = reader.ReadLine()) != null)
{
if (someCondition)
{
//Change variable line as you wish.
}
sb.Append(line);
}
using (StreamWriter sw = new StreamWriter("filePath"))
{
sw.Write(sb.ToString());
}
or
TextReader reader = new StreamReader(stream);
string line;
String newLines[];
int index = 0;
while ((line = reader.ReadLine()) != null)
{
if (someCondition)
{
//Change variable line as you wish.
}
newLines[index] = line;
index++;
}
using (StreamWriter sw = new StreamWriter("filePath"))
{
foreach (string l in newLines)
{
sw.WriteLine(l);
}
}
If memory is too important you can try this too:
TextReader reader = new StreamReader(stream);
string line;
while ((line = reader.ReadLine()) != null)
{
if (someCondition)
{
//Change variable line as you wish.
}
using (StreamWriter sw = new StreamWriter("filePath"))
{
sw.WriteLine(line);
}
}
The easiest thing is to write a new file, then when finished, replace the old file with the new file. This way you only do writes in one file.
If you try to read/write in the same file, you will run into problems when the content you want to insert is not the exact same size as the content it is replacing.
There is nothing magic about text files. They are just a stream of bytes representing characters in a text encoding. There are no line concept in the file, just separators in the form of newline characters.
If the file is not too large, you should simply rewrite the whole file:
var lines = File.ReadAllLines(path)
.Where(l => someCondition);
File.WriteAllLines(path, lines);
A very simple solution
void Main()
{
var lines = File.ReadAllLines("D:\\temp\\file.txt");
for(int x = 0; x < lines.Length; x++)
{
// Of course this is an example of the condtion
// you should implement your checks
if(lines[x].Contains("CONDITION"))
{
lines[x] = lines[x].Replace("CONDITION", "CONDITION2");
}
}
File.WriteAllLines("D:\\temp\\file.txt", lines);
}
The drawback is the memory usage caused by the in memory lines, but, if we stay around 50MB, it should be handled effortlessly by modern PC.
I Am using sharp develop. I am making a Win App using C# . I want my program check a text file named test in drive c: and find the line which contains "=" and then write this line to other newly created text file in drive c: .
Try this one-liner:
File.WriteAllLines(destinationFileName,
File.ReadAllLines(sourceFileName)
.Where(x => x.Contains("=")));
Here's another simple way using File.ReadLines, Linq's Where and File.AppendAllLines
var path1 = #"C:\test.txt";
var path2 = #"C:\test_out.txt";
var equalLines = File.ReadLines(path1)
.Where(l => l.Contains("="));
File.AppendAllLines(path2, equalLines.Take(1));
using(StreamWriter sw = new StreamWriter(#"C:\destinationFile.txt"))
{
StreamReader sr = new StreamReader(#"C:\sourceFile.txt");
string line = String.Empty;
while ((line = sr.ReadLine()) != null)
{
if (line.Contains("=")) { sw.WriteLine(line)); }
}
sr.Close();
}
Have you tried something?
Here are two ways to read a file:
Use static methods available in File class. ReadAllLines to be specific. This is good enough if you are dealing with small files. Next, once you have the array, just find the item with "=" using LINQ or by any other iteration method. Once you got the line, again use File class to create and write data to the file.
If you are dealing with large files, use Stream. Rest remains fairly same.
if (File.Exists(txtBaseAddress.Text))
{
StreamReader sr = new StreamReader(txtBaseAddress.Text);
string line;
string fileText = "";
while ((line = sr.ReadLine()) != null)
{
if (line.Contains("="))
{
fileText += line;
}
}
sr.Close();
if (fileText != "")
{
try
{
StreamWriter sw = new StreamWriter(txtDestAddress.Text);
sw.Write(fileText);
sw.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
a bit edited Furqan's answer
using (StreamReader sr = new StreamReader(#"C:\Users\Username\Documents\a.txt"))
using (StreamWriter sw = new StreamWriter(#"C:\Users\Username\Documents\b.txt"))
{
int counter = 0;
string line = String.Empty;
while ((line = sr.ReadLine()) != null)
{
if (line.Contains("="))
{
sw.WriteLine(line);
if (++counter == 4)
{
sw.WriteLine();
counter = 0;
}
}
}
}
I need help in searching the text file. I have manage to store the input values to Textfile with ":" separator.
And my result text box is like
friend1:126457890
friend2:123487012
Friend3:798461598
and now I want to search the text file and display result in labels/textbox(read only)
Here is my code to search
private void btn_search_search_Click(object sender, EventArgs e)
{
try
{
if (string.IsNullOrEmpty(txt_search.Text))
{
lbl_search_error.Text = "Please Enter name to search";
}
else
{
StreamReader sr = new StreamReader(#"path.txt");
string line;
string searchkey = txt_search.Text;
sr.ReadToEnd();
while ((line = sr.ReadLine()) != null)
{
if (line.Contains(searchkey))
break;
}
sr.Close();
string[] data = line.Split(':');
txt_result_name.Text = data[0];
txt_result_phno.Text = data[1];
}
}
catch (Exception ex)
{
lbl_search_error.Text = ex.Message;
}
}
but I get
Object reference not set to an instance of an object
I tried to keep break point and chk, error is in this line
string[] data = line.Split(':');
Please help resolving
Thank you for your time
Delete the line sr.ReadToEnd();
Let me give you a different approach using regular expression:
private void btn_search_search_Click(object sender, EventArgs e)
{
StreamReader sr = new StreamReader("Some file");
string line = sr.ReadLine();
string name="";
string number="";
while (line != null)
{
var m = Regex.Match(line, #"([\w]+):([\d]+)<br>");
if (m.Success)
{
name = m.Groups[1].Value;
number = m.Groups[2].Value; // use this name and number variables as per your need
line = sr.ReadLine();
}
else
{
line = sr.ReadLine();
}
}
}
This is a way to go about the problem. Ask any questions if you have
You are getting this error because the value of line is null in: string[] data = line.Split(':');
Take a string variable called temp and assign the value of line to temp in the while loop. Later use this variable instead of line.
Do like this:
private void btn_search_search_Click(object sender, EventArgs e)
{
try
{
if (string.IsNullOrEmpty(txt_search.Text))
{
lbl_search_error.Text = "Please Enter name to search";
}
else
{
StreamReader sr = new StreamReader(#"path.txt");
string line;
string searchkey = txt_search.Text;
sr.ReadToEnd();
string temp;
while ((line = sr.ReadLine()) != null)
{
if (line.Contains(searchkey))
{
temp = line;
break;
}
}
sr.Close();
string[] data = temp.Split(':');
txt_result_name.Text = data[0];
txt_result_phno.Text = data[1];
}
}
catch (Exception ex)
{
lbl_search_error.Text = ex.Message;
}
}