C＃：达到100个字符后，如何在空白处分割字符串

Question

I have got the following code but it doesn't seem to do what it should do. The code at the foreach loop needs to go through each character up to the 100th character. But it appears the loop runs on, it doesn't stop. How do I fix that?

StringBuilder builder = new StringBuilder();
string[] a = MainRichTextBox.Text.Split('.');

while (a[0].Length > 0 || a[0].Length != 0)
{
    NumberOfChars = a[0].Length;

    if (NumberOfChars < 100)
    {
        r = NumberOfChars;

    }

    else if (NumberOfChars == 100)
    {
        r = 100;
    }

    else if (NumberOfChars > 100)
    {
        r = 100;
    }

    decimal numberOfTweetsUnRounded = a[0].Length / 100M;

    if (numberOfTweetsUnRounded == 0)
    {
        numberOfTweetsUnRounded = 1;
    }

    int numberOfTweetsRounded = Convert.ToInt32(Math.Ceiling(numberOfTweetsUnRounded));
    int numberOfSpaces = 0;
    int indexOfSpaces = 0;
    int indexOfCChars = 0;
    int indexPointOfSplit = 0;
    for (int i = 1; i <= numberOfTweetsRounded; i++)
    {
        if (r == 100)
        {
            //The problem occurs here. This loop doesn't stop at the 100th character.
            foreach (char c in a[0].Substring(0, 100))
            {
                indexOfCChars++;
                if (c == ' ')
                {
                    indexOfSpaces++;
                    indexPointOfSplit = indexOfCChars;
                    MessageBox.Show(indexPointOfSplit.ToString());
                }
            }
        }

        //When I split the string, it doesn't work. It gives an error of the index being outside the range.
        string breakOff = a[0].Substring(0, indexPointOfSplit);
        builder.Append(breakOff).Append(" " + textBox1.Text).Append(" [" + i + "/" + numberOfTweetsRounded + "] " + "\r\n");

        showNow = builder.ToString();
    }

    a[0] = a[0].Remove(0, indexPointOfSplit);
    builder.Clear();
    NumberOfChars = a[0].Length;
    MainRichTextBox.AppendText(showNow);


    //When I split the string, it doesn't work. It gives an error of the index being outside the range.
    string breakOff = a[0].Substring(0, indexPointOfSplit);
    builder.Append(breakOff).Append(" " + textBox1.Text).Append(" [" + i + "/" + numberOfTweetsRounded + "] " + "\r\n");

    showNow = builder.ToString();
}

a[0] = a[0].Remove(0, indexPointOfSplit);
builder.Clear();
NumberOfChars = a[0].Length;
MainRichTextBox.AppendText(showNow);

Answer 1

Well, I stepped throught he code, and and it appears to exit that loop, I made some slight changes to your code:

  while (a[0].Length > 0 || a[0].Length != 0)
        {
            NumberOfChars = a[0].Length;
            if (NumberOfChars < 100)
            {
                r = NumberOfChars;

            }
            else if (NumberOfChars == 100)
            {
                r = 100;
            }
            else if (NumberOfChars > 100)
            {
                r = 100;
            }

            decimal numberOfTweetsUnRounded = a[0].Length/100M; 
            if (numberOfTweetsUnRounded == 0)
            {
                numberOfTweetsUnRounded = 1;
            }

            int numberOfTweetsRounded = Convert.ToInt32(Math.Ceiling(numberOfTweetsUnRounded));
            int numberOfSpaces = 0;
            int indexOfSpaces = 0;
            int indexPointOfSplit = 0;
            for (int i = 1; i <= numberOfTweetsRounded; i++)
            {
                if (r == 100)
                {
                    string firstItem = a[0].Substring(0, 100);
                    for (int pos = 0; pos < firstItem.Length; pos++)
                    {
                        if (!Char.IsWhiteSpace(firstItem[pos]))
                            continue;
                        indexOfSpaces++;
                        indexPointOfSplit = pos;
                    }
                }
                //When I split the string, it doesn't work. It gives an error of the index being outside the range.
                string breakOff = a[0].Substring(0, indexPointOfSplit);
            }
            a[0] = a[0].Remove(0, indexPointOfSplit);
            builder.Clear();
            NumberOfChars = a[0].Length;
        }

Hope that helps.

Answer 2

I think you want to initialize indexOfCChars to 0 before the foreach loop. Since it can have a value greater than 0 before the loop, it can be incremented to a value greater than 100 during the loop. This makes it appear as if the loop body is executing over 100 times, which is not likely.

Answer 3

I believe you need to set indexOfCChars = 0 after your if (r == 100) statement.

 if (r == 100)
    {

        indexOfCChars = 0

        //The problem occurs here. This loop doesn't stop at the 100th character.
        foreach (char c in a[0].Substring(0, 100))
        {
            indexOfCChars++;
            if (c == ' ')
            {
                indexOfSpaces++;
                indexPointOfSplit = indexOfCChars;
                MessageBox.Show(indexPointOfSplit.ToString());
            }
        }
    }