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我这边没有VS环境，但是问题很清楚，就是你在处理的过程中把换行符滤掉了，所以不过滤它就可以了的。

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丢掉了补上就好了。

但是输出结果几千行不好这样弄啊

代码中什么时候开始丢失换行符的，
然后在输入的时候，遇到丢失换行符的前一个位置，加入换行符！
添加接口实现！（不是手动哦）

不是代码丢失，这个程序是用来处理TXT文本的，txt文本处理结束后输出结果里TXT原有的所有换行符就丢失了。。
现在想知道的是用什么代码加进去可以防止换行符丢失。。工程文件已经全部在上面提供的压缩包了能不能帮忙看下

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace AeLaoye
{
    public partial class Form1 : Form
    {
        string OpenPath;
        string SavePath; 
 
        string content;
        int Plusnumber;

        public Form1()
        {
            InitializeComponent();
        }

        private void OpenFile_Click(object sender, EventArgs e)
        {
            if (openpath.Text == "")
            {
                DialogResult result = openFileDialog1.ShowDialog();
                if (result == DialogResult.OK)
                {
                    OpenPath = openFileDialog1.FileName;
                    openpath.Text = OpenPath;
                }
            }
            else
                OpenPath = openpath.Text;
            try
            {
                StreamReader reader = new StreamReader(OpenPath, Encoding.GetEncoding("GB2312"), true);
                content = reader.ReadToEnd();
                Filecontent.Text = content;
                reader.Close();
            }
            catch (Exception a)
            {
                MessageBox.Show("文件不存在"); 
 
            }
        }

        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            number.Enabled = false;
        }

        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            number.Enabled = false;
        }

        private void radioButton3_CheckedChanged(object sender, EventArgs e)
        {
            number.Enabled = false;
        }

        private void radioButton4_CheckedChanged(object sender, EventArgs e)
        {
            number.Enabled = true;
            try
            {
                Plusnumber = Convert.ToInt32(number.Text);
            }
            catch (Exception a)
            { }
        }

        private void number_TextChanged(object sender, EventArgs e)
        {
            try
            {
                Plusnumber = Convert.ToInt32(number.Text);
            }
            catch (Exception a)
            { }
        } 
 

        private void SaveFile_Click(object sender, EventArgs e)
        {
            if (savepath.Text == "")
            {
                DialogResult result = saveFileDialog1.ShowDialog();
                if (result == DialogResult.OK)
                {
                    SavePath = saveFileDialog1.FileName;
                    savepath.Text = SavePath.Substring(SavePath.LastIndexOf('\\') + 1);
                }
            }
            else
                SavePath = OpenPath.Substring(0, OpenPath.LastIndexOf('\\') + 1) + savepath.Text;
            try
            {
                StreamWriter writer = new StreamWriter(SavePath, false, Encoding.GetEncoding("GB2312"));
                writer.Write(content);
                writer.Close();
            }
            catch (Exception a)
            { }
        }

        private void Go_Click(object sender, EventArgs e)
        {
            content = Filecontent.Text;
            char[] sp = { ' ', '\t', '\n', '\r' }; 
 
            string[] temps = content.Split(sp);
            for (int i = 0; i < temps.GetLength(0); i++)
            {
                if (temps[i] == keyword.Text && i < temps.GetLength(0) - 1)
                {
                    try
                    {
                        double number = Convert.ToDouble(temps[i + 1]);
                        if (radioButton1.Checked)
                            number = number / 2;
                        else if (radioButton2.Checked)
                            number = Math.Sin(number);
                        else if (radioButton3.Checked)
                            number = Math.Cos(number);
                        else if (radioButton4.Checked)
                            number = number + Plusnumber;
                        temps[i + 1] = ((int)(number + 0.5)).ToString();

                        i++;    /////需不需要自己看着办._. 
 
                    }
                    catch (Exception a)
                    { }
                }
            }

            content="";
            foreach (string temp in temps)
                content += temp + " ";


            Filecontent.Text = content;
        }
    }
}

能不能帮忙看看哪里出问题