C＃目录列表大规模目录 [英] C# Directory listing massive directory

问题描述

下面是该方案：

我有2+万个文件的目录。我有下面的代码写入的所有文件，在大约90分钟。是否有人有办法加快速度或使代码比较有效？我也想只写了在列表中的文件名。

I have a directory with 2+ million files. The code I have below writes out all the files in about 90 minutes. Does anybody have a way to speed it up or make this code more efficent? I'd also like to only write out the file names in the listing.

string lines = (listBox1.Items.ToString());
string sourcefolder1 = textBox1.Text;  
string destinationfolder = (@"C:\anfiles");  
using (StreamWriter output = new StreamWriter(destinationfolder + "\\" + "MasterANN.txt"))  
{  
    string[] files = Directory.GetFiles(textBox1.Text, "*.txt");  
    foreach (string file in files)  
    {  
        FileInfo file_info = new FileInfo(file);
        output.WriteLine(file_info.Name);  
    }  
 }  

慢下来的是，它在写出1号线一时间。

The slow down is that it writes out 1 line at a time.

大约需要13-15分钟，让所有需要写出来的文件。

It takes about 13-15 minutes to get all the files it needs to write out.

下面75分钟是创建该文件。

The following 75 minutes is creating the file.

推荐答案

这可以帮助，如果你不做出一个FileInfo实例每个文件使用Path.GetFileName来代替：

It could help if you don't make a FileInfo instance for every file, use Path.GetFileName instead:

string lines = (listBox1.Items.ToString());  
        string sourcefolder1 = textBox1.Text;  
        string destinationfolder = (@"C:\anfiles");  
        using (StreamWriter output = new StreamWriter(Path.Combine(destinationfolder, "MasterANN.txt"))  
        {  
            string[] files = Directory.GetFiles(textBox1.Text, "*.txt");  
            foreach (string file in files)  
            {  
                output.WriteLine(Path.GetFileName(file));
            }  
        }

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