C#文件的拆分与合并操作示例

C#文件的拆分与合并操作示例代码。

全局变量定义

　　　　int size=100;//文件大小
        //拆分、合并的文件数
        int count;
        FileInfo splitFile;
        string splitFliePath;
        FileStream splitFileStream;

        FileInfo joinFile;
        string joinFliePath;
        FileStream joinFileStream;

拆分文件操作

private void CheckSplit_Click(object sender, EventArgs e)
        {            
            OpenFileDialog fd = new OpenFileDialog();
            if (fd.ShowDialog() == DialogResult.OK)
            {
                txtFilePath.Text = fd.FileName;
                splitFile = new FileInfo(fd.FileName);
                splitFliePath = splitFile.FullName.Substring(0, splitFile.FullName.Length - fd.SafeFileName.Length);
                splitFileStream = new FileStream(splitFile.FullName, FileMode.Open, FileAccess.Read);
            }
        }
        private void btnSplit_Click(object sender, EventArgs e)
        {
            int length = (int)splitFileStream.Length;
            txtSplit.AppendText(Environment.NewLine + "拆分文件的大小:" + length + "
");
            count = length / (size * 1024);
            count = length % (size * 1024) == 0 ? count : count + 1;
            for (int i = 1; i <= count; i++)
            {
                using (FileStream fgstream = new FileStream(splitFliePath + (i - 1) + splitFile.Extension, FileMode.OpenOrCreate, FileAccess.Write))
                {
                    if (i == count)
                    {
                        size = length - (count - 1) * 102400;
                    }
                    else
                    {
                        size = 102400;
                    }
                    byte[] buffer = new byte[size];
                    int data = 0;
                    if ((data = splitFileStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        BinaryWriter bWriter = new BinaryWriter(fgstream, Encoding.Default);
                        bWriter.Write(buffer, 0, data);  
                    }
                }
                txtSplit.AppendText(Environment.NewLine + "拆分出文件:" + splitFliePath + (i - 1) + splitFile.Extension + "
");
            }
            txtSplit.AppendText(Environment.NewLine + "拆分完成！
");
        }

合并文件操作

private void CheckJoin_Click(object sender, EventArgs e)
        {
            OpenFileDialog fd = new OpenFileDialog();
            if (fd.ShowDialog() == DialogResult.OK)
            {
                txtFlie.Text = fd.FileName;
                joinFile = new FileInfo(fd.FileName);
                joinFliePath = "C:\Users\XXXX\Desktop\合并\";
            }
        }
private void btnJoin_Click(object sender, EventArgs e)
        {
            using (joinFileStream = new FileStream(joinFliePath + "join" + joinFile.Extension, FileMode.OpenOrCreate, FileAccess.Write))
            {
                  for (int i = 0; i < count; i++)
                {
                    using (FileStream readStream = new FileStream(joinFile.FullName.Substring(0, joinFile.FullName.Length - joinFile.Extension.Length - 1) + i + joinFile.Extension, FileMode.Open, FileAccess.Read))
                    {
                        byte[] buffer = new byte[readStream.Length];
                        int data = 0;
                        if ((data = readStream.Read(buffer, 0, buffer.Length)) > 0)
                        {
                            BinaryWriter binary = new BinaryWriter(joinFileStream, Encoding.Default);
                            binary.Write(buffer, 0, data);
                        }
                    }
                    txtJoin.AppendText(Environment.NewLine + "合并文件:" + splitFliePath + (i) + splitFile.Extension + "
");
                }
                txtJoin.AppendText(Environment.NewLine + "合并完成！
");
                txtJoin.AppendText(Environment.NewLine + "合并后文件的大小:" + joinFileStream.Length + "
");
            }
        }