How can I merge two big files in c#

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Hi friends

I hope you all doing well,

I have to merge two big file in my winform application. First I used File.WriteAllText(), But it throw memory outof bound exception. So please help me to find a optimized and low memory used code to solve my problem.

Thanks and regards

Posted 27-Feb-14 0:31am

binoyvijayan

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[no name] 27-Feb-14 6:55am

What file you are trying to merge...??

binoyvijayan 27-Feb-14 7:37am

its .sql files

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OriginalGriff · Accepted Answer · 2014-02-27T01:04:00

Assuming your files are text files, (or you wouldn't be trying WriteAllText) there are a huge number of ways you could do it - but most of the problem is centered on the "Merge" part.
If you have two files on disk, and you want to just create a third file with one following the other, then it's pretty easy:
open the output file, as a stream, and read the input files in chunks, writing each chunk to the output.

C#

private void butMerge_Click(object sender, EventArgs e)
    {
    using (StreamWriter sw = new StreamWriter(@"D:\Temp\Output.txt"))
        {
        AppendFile(sw, @"D:\Temp\MyHugeText1.txt");
        AppendFile(sw, @"D:\Temp\MyHugeText2.txt");
        }
    }

private void AppendFile(StreamWriter sw, string path)
    {
    int blockSize = 1024 * 1024 * 8;
    char[] block = new char[blockSize];
    using (StreamReader sr = new StreamReader(path))
        {
        while (!sr.EndOfStream)
            {
            int chars = sr.Read(block, 0, blockSize);
            sw.Write(block, 0, chars);
            }
        }
    }

binoyvijayan · Accepted Answer · 2014-02-27T04:22:00

const int chunkSize = 2 * 1024; // 2KB
var inputFiles = new[] { "file1.dat", "file2.dat","file3.dat" };
using (var output = File.Open(outputfile,FileMode.Append))
{
foreach(strng file in inputfiles)
{

using (var input = File.OpenRead(file))
{
var buffer = new byte[chunkSize];
int bytesRead;
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0)
{
output.Write(buffer, 0, bytesRead);
}

}
}

}

I think its have better performance ..

How can I merge two big files in c#

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