写文件需要为交通繁忙优化 [英] write file need to optimised for heavy traffic

问题描述

我很新的C＃，这是我的第一个问题，请对我温柔

i am very new to C#, and this is my first question, please be gentle on me

我试图写一个应用程序来捕获一些蜱数据数据提供者，以下是该计划的主要部分。

I am trying to write a application to capture some tick data from the data provider, below is the main part of the program

void zf_TickEvent(object sender, ZenFire.TickEventArgs e)
{

    output myoutput = new output();

    myoutput.time = e.TimeStamp;
    myoutput.product = e.Product.ToString();
    myoutput.type = Enum.GetName(typeof(ZenFire.TickType), e.Type);
    myoutput.price = e.Price;
    myoutput.volume = e.Volume;

    using (StreamWriter writer = File.AppendText("c:\\log222.txt"))
    {

        writer.Write(myoutput.time.ToString(timeFmt) + ",");
        writer.Write(myoutput.product + "," );
        writer.Write(myoutput.type + "," );
        writer.Write(myoutput.price + ",");
        writer.Write(myoutput.volume + ",");

    }

我已经成功地将数据写入到文本文件中，但是我知道，这个方法会被调用像10000次，第二次在高峰时间，并打开一个文件，并追加了很多次第二是非常低效的，我指出来使用缓冲区或某种，但我不知道如何做到这一点，我尝试阅读文档，但我仍然不明白，这就是为什么我这里寻求帮助。

i have successfully write the data into the text file, however i know that this method will be call like 10000 times a second during peak time, and open a file and append it many times a second is very inefficient, i was pointed to use a buffer or some sort, but i have no idea how to do it, i try reading the document but i still dont understand, thats why i turn in here for help.

请给我一些（工作）代码片段，所以我可以指着写方向。谢谢

Please give me some (working) snippet code so i can pointed to the write direction. thanks

编辑：我已经简化代码，尽可能

i have simplified the code as much as possible

    using (StreamWriter streamWriter = File.AppendText("c:\\output.txt"))
    {
        streamWriter.WriteLine(string.Format("{0},{1},{2},{3},{4}",
                        e.TimeStamp.ToString(timeFmt),
                        e.Product.ToString(),
                        Enum.GetName(typeof(ZenFire.TickType), e.Type),
                        e.Price,
                        e.Volume));
    }

ED告诉我，使我的流场，又是怎样的语法好像？任何人都可以张贴一些代码，以帮助我吗？非常感谢

ED has told me to make my stream to a field, how is the syntax looks like? can anyone post some code to help me? thanks a lot

推荐答案

我会用的String.Format：

I would use String.Format:

using (StreamWriter writer = new StreamWriter(@"c:\log222.txt", true))
        {
            writer.AutoFlush = true;
            writer.Write(String.Format("{0},{1},{2},{3},{4},", myoutput.time.ToString(timeFmt), 
                myoutput.product, myoutput.type, myoutput.price, myoutput.volume);
        }

如果您使用 @ 字符串之前，您不必用双 \ 。

If you use @ before string you don't have to use double \.

这是更快 - 你写一次的文件，而不是5次，此外，您不使用 + 运营商，字符串这是不。最快的运行;）

This is much faster - you write only once to the file instead of 5 times. Additionally you don't use + operator with strings which is not the fastest operation ;)

此外 - 如果这是多线程的应用程序 - 你应该考虑使用一些锁。这将阻止应用程序的尝试写入，例如从该文件。 2个线程在同一时间。

Also - if this is multithreading application - you should consider using some lock. It would prevent application from trying to write to the file from eg. 2 threads at one time.

这篇关于写文件需要为交通繁忙优化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！