C# - 查找/编辑/替换字符串

Question

I am trying to retrieve data from a file to change it and replace the old data.

I have a file that looks something like this:

TEXT  NEXT_TEXT  10.505   -174.994 0  
TEXT  NEXT_TEXT  100.005  174.994  90  
TEXT  NEXT_TEXT  -10.000  -5.555   180  
TEXT  NEXT_TEXT  -500.987 5.123    270  
TEXT  NEXT_TEXT  987.123  1.000    180  
TEXT  NEXT_TEXT  234.567  200.999  90 

I am trying to grab the 3rd and 4th columns to change the data based on what a user inputs into two TextBoxes . Let's label the 3rd column "X" and the 4th column "Y" . With this, there are also two TextBoxes labeled "xTextBox" and "yTextBox" . These textboxes allow the user to enter in numbers and the number they enter in (postive, negative, and/or a decimal up to 3 decimal places) for each textbox (X and Y) will be ADDED to the "X" column values and the "Y" column values.

Right now, I am using this CODE (below) to strip the "X" and "Y" columns and display their values into different RichTextBoxes labeled xRichTextBox and yRichTextBox .

So, the xRichTextBox looks like this:

10.505
100.005
-10.000
-500.987
987.123
234.567

and the yRichTextBox looks like this:

-174.994
174.994
-5.555
5-123
1.000
200.999

---

CODE:

    private void calculateXAndYPlacementTwo()
    {
        // Reads the lines in the file to format.
        var fileReader = File.OpenText(filePath);

        // Creates a list for the lines to be stored in.
        var fileList = new List<string>();

        // Adds each line in the file to the list.
        while (true)
        {
            var line = fileReader.ReadLine();
            if (line == null)
                break;
            fileList.Add(line);
        }

        // Creates new lists to hold certain matches for each list.
        var xyResult = new List<string>();
        var xResult = new List<string>();
        var yResult = new List<string>();

        // Iterate over each line in the file and extract the x and y values
        fileList.ForEach(line =>
        {
            Match xyMatch = Regex.Match(line, @"(?<x>-?\d+\.\d+)\s+(?<y>-?\d+\.\d+)");
            if (xyMatch.Success)
            {
                // grab the x and y values from the regular expression match
                String xValue = xyMatch.Groups["x"].Value;
                String yValue = xyMatch.Groups["y"].Value;

                // add these two values, separated by a space, to the "xyResult" list.
                xyResult.Add(String.Join(" ", new[]{ xValue, yValue }));

                // Adds the values into the xResult and yResult lists.
                xResult.Add(xValue);
                yResult.Add(yValue);

                // Place the 'X' and 'Y' values into the proper RTB.
                xRichTextBox.AppendText(xValue + "\n");
                yRichTextBox.AppendText(yValue + "\n");
            }
        });
    }

---

SO for example if the user enters in "10.005" for the xTextBox and "-20" for the yTextBox the updated xRichTextBox would look like this:

20.510
110.010
0.005
-490.982
997.128
224.572

and the updated yRichTextBox would look like this:

-194.994
154.994
-25.555
-14.877
-19.000
180.999

---

After this takes place, I am trying to replace the 3rd and 4th columns of the original file with the updated values.

• I am currently getting the values ("X" and "Y") in the file and outputting them to seperate RichTextBoxes , but I do not know how to add these values to the values entered in from each TextBox ... How can I do this?
• After the RichTextBox values are calculated with the 'TextBox` values, how can I take these new values and add them to the original file?

**These values are not always the same or else I would hardcode them in.

---

So, the new file would look like this:

TEXT  NEXT_TEXT  20.510   -194.994 0  
TEXT  NEXT_TEXT  110.010  154.994  90  
TEXT  NEXT_TEXT  0.005    -25.555  180  
TEXT  NEXT_TEXT  -490.982 -14.877  270  
TEXT  NEXT_TEXT  997.128  -19.000  180  
TEXT  NEXT_TEXT  224.572  180.999  90 

Answer 1

I suggest using a structured text file parser to parse and rewrite the file.

There is one in the Microsoft.VisualBasic.FileIO namespace, the TextFieldParser . This is a normal .NET assembly, so you can reference it in your code and use in from C#.

Answer 2

You know how to read the files, but it sounds as though you're just putting them straight into the textboxes. I would create an object to represent a line (with an x, y, and whatever the last column is). When you read them in, create a list of the objects. To display them, loop through and select each x (can easily be done with linq if you're using 4.0) and each y for the separate ones. To update, loop through and add the appropriate number to each object. Then to save, just write out each object again.

Edit: After looking more carefully at your code, you're keeping a list of the Xs, and a list of the Ys. Create the object I mentioned and only keep a list of those.

Answer 3

before u save your date be sure to create string of data to be saved and than using textwriter or streamwriter save all content to the file again. I do not think u will be able to change only one portion of file and save it