How can we use AppendAllLines in .net framework 3.5

Question

1.33/5 (2 votes)

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AppendAllLines is work in .net framework 4.5
but how can we use append all line in 3.5

C#

//4.5
string[] a = new string[] { fa + " "+ lastModified };
System.IO.File.AppendAllLines(filepath, a);

//3.5
string[] a = new string[] { fa + " "+ lastModified };
var ab = string.Join(Environment.NewLine, DataList.Select(x => x.blah blah blah).ToArray());
string outputFilePath = @"C:\output.txt";
File.AppendAllText(outputFilePath, ab);

public static void AppendAllLines(string path, IEnumerable<string> lines)
{
     using (var writer = new StreamWriter(path, true))
         foreach (var line in lines)
             writer.WriteLine(line);
}

Posted 18-May-15 19:21pm

Aditya Chauhan

Updated 18-May-15 20:19pm

Tomas Takac

v2

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Tomas Takac 19-May-15 2:21am

Apparently you have code for 3.5 already. So what's the problem?

Afzaal Ahmad Zeeshan 5-Jun-15 10:12am

Good catch!

2 solutions

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OriginalGriff · Answer 1 · 2015-05-18T20:39:00

Solution 1

You can't use File.AppendAllLines in version prior to .NET 4.0 - it was added at that point.

Instead, you would need to do something like the string.Join code you show in your question.

Posted 18-May-15 20:39pm

OriginalGriff

Aditya Chauhan · Answer 2 · 2015-06-05T03:09:00

C#

string[] a = new string[] { fa + " "+ lastModified };
                          using (TextWriter writer = File.AppendText(filepath))
                          {
                              foreach (string actor in a)
                              {
                                  writer.WriteLine(actor);
                              }
                          } Console.WriteLine(fa);