如果它包含100000行数据,如何在C#中编写超快的ascii文件？

Question

我有一个代码,从C#中的随机类生成随机字符串和数字.然后将其写入文本文件.我怎样才能提高性能？代码如下:

    int i = 0;
    Record[] rec = new Record[100000];
    Class1 cl = new Class1();
    Random random = new Random();
    while (i < 100000)
    {
        rec[i].num1 = random.Next();
        rec[i].num2 = random.Next();
        rec[i].mult = rec[i].num1 * rec[i].num2;
        rec[i].rel = true;
        rec[i].name = cl.generateRandomString(1);
        rec[i].var_set = cl.generateRandomString(2);          
        using (StreamWriter writer = new StreamWriter("important.txt", true))
        {

            writer.Write(rec[i].name);
            writer.Write("   ");
            writer.Write(rec[i].var_set);
            writer.Write("   ");
            writer.Write(rec[i].num1);
            writer.Write("   ");
            writer.Write(rec[i].num2);
            writer.Write("   ");
            writer.Write(rec[i].mult);
            writer.Write("   "); 
            writer.WriteLine(rec[i].rel);
        }
        i++;

Answer 1

根据您在@Ben评论中提供的代码,我得到了您正在使用的代码.

Record[] rec = new Record[100000]; 
Class1 cl = new Class1(); 
Random random = new Random(); 
while (i < 100000) 
{ 
    rec[i].num1 = random.Next();
    rec[i].var_set = cl.generateRandomString(2);
    using (StreamWriter writer = new StreamWriter("important.txt", true)) 
    { 
        writer.Write(rec[i].name); 
        writer.Write(" "); 
    } 
    i++;
}

我看到的最大问题是你正在为循环的每次迭代打开streamwriter.您可能希望将代码更改为类似的内容,以便只打开一次文件.

int i = 0;
Record[] rec = new Record[100000]; 
Class1 cl = new Class1(); 
Random random = new Random(); 
StreamWriter sr = new StreamWriter("important.txt", true);

try
{
    while (i < 100000) 
    { 
        rec[i].num1 = random.Next();
        rec[i].var_set = cl.generateRandomString(2);
        sr.Write(rec[i].name); 
        sr.Write(" "); 
        i++;
    }
}
finally
{
    sr.Close();
}