添加第一行写入外部文件的文本

Question

这是我的问题...

我正在验证文本文件中的行长度，一次一行。如果长度 <= 2033，则进行处理。如果它 > 2033，它会进入不同的文件。

我希望能够在错误文件的顶部添加一些信息。但是，我只想在要添加的第一行中添加文本。这就是我到目前为止所拥有的：

//Pass the file path and file name to the StreamReader and StreamWriter constructors
StreamReader sr = new StreamReader(inputFile);
StreamWriter sw = new StreamWriter(Dts.Connections["CE802CleanInput"].ConnectionString);
StreamWriter swe = new StreamWriter(Dts.Connections["CE802PreValidationErrors"].ConnectionString);

//Read the first line
line = sr.ReadLine();

while (line != null)
{
   int length = line.Length;
   if (length > 2033)
   {
        if // THIS IS WHERE I WOULD HAVE TO ADD THE CONDITION
        {
            swe.WriteLine("Some records have been rejected at the pre validation phase.");
            swe.WriteLine("Those records will not be included in the process.");
            swe.WriteLine("Please review the records below, fix and re submit if applicable.");
            swe.WriteLine("Input file: " + Dts.Connections["CE802Input"].ConnectionString.ToString());
            swe.WriteLine();
            swe.WriteLine(line);
            count++;
        }
        else
        {
            swe.WriteLine(line);
            count++;
        }
   }
   if (length <= 2033)
   {
        sw.WriteLine(line);
   }
    line = sr.ReadLine(); 
}

Answer 1

添加一个布尔运算符，只有第一次才做额外的行，然后设置它下次不写，但总是为坏数据写你的行

//Pass the file path and file name to the StreamReader and StreamWriter constructors
            StreamReader sr = new StreamReader(inputFile);
            StreamWriter sw = new StreamWriter(Dts.Connections["CE802CleanInput"].ConnectionString);
            StreamWriter swe = new StreamWriter(Dts.Connections["CE802PreValidationErrors"].ConnectionString);

            bool writeHeaderLine = false;

            //Read the first line
            line = sr.ReadLine();

            while (line != null)
            {
                int length = line.Length;
                if (length > 2033)
                {
                    // only do this if it is false/first time
                    if(writeHeaderLine == false) // THIS IS WHERE I WOULD HAVE TO ADD THE CONDITION
                    {
                        swe.WriteLine("Some records have been rejected at the pre validation phase.");
                        swe.WriteLine("Those records will not be included in the process.");
                        swe.WriteLine("Please review the records below, fix and re submit if applicable.");
                        swe.WriteLine("Input file: " + Dts.Connections["CE802Input"].ConnectionString.ToString());
                        swe.WriteLine();                        
                        writeHeaderLine = true;
                    }

                    // always do this
                    swe.WriteLine(line);
                    count++;

                }
                if (length <= 2033)
                {
                    sw.WriteLine(line);
                }
                line = sr.ReadLine();
            }

Answer 2

using (StreamReader sr = new StreamReader(inputFile))
        {
            using (StreamWriter sw = new StreamWriter(Dts.Connections["CE802CleanInput"].ConnectionString))
            {
                using (StreamWriter swe = new StreamWriter(Dts.Connections["CE802PreValidationErrors"].ConnectionString));
                {
                    swe.WriteLine("Some records have been rejected at the pre validation phase.");
                    swe.WriteLine("Those records will not be included in the process.");
                    swe.WriteLine("Please review the records below, fix and re submit if applicable.");
                    swe.WriteLine("Input file: " + Dts.Connections["CE802Input"].ConnectionString.ToString());

                    while (line = sr.ReadLine() != null)
                    {
                        int length = line.Length;

                        if (length > 2033)
                        {
                            swe.WriteLine();
                            swe.WriteLine(line);
                            count++;
                        }
                        else
                        {
                            sw.WriteLine(line);
                        }
                    }
                }
            }
        }

Answer 3

是的！！！谢谢:-)

bool firstError = true;

           while (line != null)
            {
               int length = line.Length;
               if (length > 2033)
               {
                    if (firstError)
                    {
                        firstError = false; 
                        swe.WriteLine("Some records have been rejected at the pre validation phase.");

                        // etc. etc.

添加第一行写入外部文件的文本

Add text with the 1st line that is written to an external file

c#

text

streamwriter