我正在将每行只有一个电子邮件地址的 master_email_list.txt 输入到字符串 fileContent 中
我的表单询问每个文件有多少封电子邮件,并且是 splitNum
int splitNum = int.Parse(numToSplit.Text);
它还从 folderBroswerDialog1 请求目录 saveFolder。
我想获取字符串 fineContent 并将每个文件的 splitNum 电子邮件输出到 saveFolder
因此它会将文件内容拆分为每个文件 100 封电子邮件,并在 saveFolder 中自动生成文件名 001.txt 002.txt 等。最后一个文件将只剩下剩下的。
我正朝着 if 循环的方向发展,(也许是最好的方式?)这样做的最佳方式是什么?
编辑
这是我的新代码:
public partial class Form2 : Form
{
public string startfiledir { get; private set; }
public string[] fileContent { get; private set; }
public string saveFolder { get; private set; }
public string filePath { get; private set; }
public string writers { get; private set; }
OpenFileDialog openFileDialog = new OpenFileDialog();
private void Button1_Click(object sender, EventArgs e)
{
this.button1.Enabled = false;
Refresh();
openFileDialog.InitialDirectory = startfiledir;
openFileDialog.Filter = "txt files (*.txt)|*.txt";
openFileDialog.FilterIndex = 2;
openFileDialog.RestoreDirectory = true;
openFileDialog.ShowDialog();
//Get the path of specified file
filePath = openFileDialog.FileName;
string[] fileContent = File.ReadAllLines(filePath);
//show the button again
this.button1.Enabled = Enabled;
Refresh();
}
private void SplitDatabutton_Click(object sender, EventArgs e)
{
//float splitNum = Int32.Parse(numToSplit.Text);
float splitNum = 100000;
ConcurrentDictionary<string, StreamWriter> writers = new ConcurrentDictionary<string, StreamWriter>();
var Tasks = System.Threading.Tasks.Parallel.For(0, fileContent.Length, (i) =>
{
string MyFile = Path.Combine(saveFolder, ((int)(i / ((float)splitNum))).ToString("0000") + ".txt");
writers.GetOrAdd(MyFile, File.AppendText(MyFile)).WriteLine(fileContent[i]);
});
foreach (var writer in writers)
{
writer.Value.Close();
}
}
}
最佳答案
您的案例很适合并行处理。以下是如何使用 System.Tasks
完成这项工作的粗略概念:
ConcurrentDictionary<string, StreamWriter> writers = new ConcurrentDictionary<string, StreamWriter>();
string[] fileContent = File.ReadAllLines("MAIN_FILE_PATH");
var Tasks = System.Threading.Tasks.Parallel.For(0, fileContent.Length, (i) =>
{
string MyFile = ((int)(i / 100f)).ToString("0000") + ".txt";
writers.GetOrAdd(MyFile, File.AppendText(MyFile)).WriteLine(fileContent[i]);
});
foreach (var writer in writers)
writer.Value.Close();
编辑
在评论中回答您的问题,更改此代码中的以下内容:
看起来您已使用
File.ReadAllText()
读取您的主文件。由于您的主文件每行有一封电子邮件,我建议您改为使用ReadAllLines()
,这样您以后就不必拆分fileContent
。因此,将ReadAllText()
行替换为以下行:string[] fileContent = File.ReadAllLines("MAIN_FILE_PATH");
上面的行还会为您提供主文件中电子邮件数量的正确计数。
在下一行中使用
saveFolder
和numToSplit
构建输出路径:string MyFile = Path.Combine(saveFolder, ((int)(i / ((float)numToSplit))).ToString("0000") + ".txt");
这将正确命名最多 10000 个文件的 block 文件。如果您需要更多,可以增加
ToString("0000")
部分中的零个数。
编辑2
以下是您需要进行的更改:
using System.Collections.Concurrent;
using System.IO;
public partial class Form2 : Form
{
public string startfiledir { get; private set; }
public string[] fileContent { get; private set; }
public string saveFolder { get; private set; }
public string filePath { get; private set; }
private ConcurrentDictionary<string, StreamWriter> writers = new ConcurrentDictionary<string, StreamWriter>();
OpenFileDialog openFileDialog = new OpenFileDialog();
private void Button1_Click(object sender, EventArgs e)
{
this.button1.Enabled = false;
Refresh();
openFileDialog.InitialDirectory = startfiledir;
openFileDialog.Filter = "txt files (*.txt)|*.txt";
openFileDialog.FilterIndex = 2;
openFileDialog.RestoreDirectory = true;
openFileDialog.ShowDialog();
//Get the path of specified file
filePath = openFileDialog.FileName;
fileContent = File.ReadAllLines(filePath);
//show the button again
this.button1.Enabled = Enabled;
Refresh();
}
private void SplitDatabutton_Click(object sender, EventArgs e)
{
int splitNum = 100;
int chunks = (int)(fileContent.Length / (float)splitNum);
var Tasks = Parallel.For(0, chunks, (i) =>
{
string MyFile = Path.Combine(savePath, i.ToString("0000") + ".txt");
using (var W = File.AppendText(MyFile))
{
for (int j = i * splitNum; j < (i + 1) * splitNum; j++)
W.WriteLine(fileContent[j]);
}
});
}
}
关于c# - 如何将字符串输出到多个文件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58056505/