Need help on StreamWriter

Question

Hello Friends,

I am using StreamWriter Class to write text to a file. I am using a script task in a SSIS package and using C# to write records to the text file. While writing, I have to write the Hard Coded Header information to the first line of the file. Then i have to append the records from Line 2.

I am using WriteLine() method to write the records. I am not sure how to find if I am writing the first line of the file or if I am appending records to the file. Is there a way to check it?

so the scenario is, write the Header info if it is the first line of the file, else write the other records.

Please help me on this.

Regards,

Murali

Answer 1

Before writing to the file just obtain the number of lines using File. If the count is zero, write header.

if (File.ReadAllLines(filePath).Length > 0)
{
    //WriteHeader
}
else
{
    //Write non-header
}

I hope this helps you.

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Answer 2

Hi,

before writing to the file, you could check, if the file exists, and if, read the file to check if it already contains data.

Regards,

  Thorsten

Answer 3

static IEnumerable<SomeType> ReadFrom(string file) {
    string line;
    using(var reader = File.OpenText(file)) {
        if((line = reader.ReadLine()) != null) 
          {
            //write other records
          }
        else
         {
           //write header
         }
    }
}

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Peter Koueik
Please mark this post as answered if it solved your problem. Thanks...