如何使用C#代码读取文件? [英] How to read from a file using C# code?

问题描述

我有一个包含两行的文件.在哪一行有double参数. 我想从文件中读取这两行，并将它们保存在double数组中. 我使用了下面的C#代码，但是它不起作用.运行代码后，它什么也没读，并且数组为空. 有人知道我在哪里做错了吗? 感谢您的帮助.

I have a file contains two lines . and in which line there is a double parameter . I want to read both lines from the file and save them in an array of doubles . I used the C# code below , but It doesn't work . It doesn't read anything and the array is empty after running the code . Anybody has any idea where did I do wrong ? Thanks for help .

    private FileStream input;
    double[] arr;
    int i = 1;

    input = new FileStream(Application.StartupPath+"\\City.txt", FileMode.Open, FileAccess.Read);
    StreamReader reader = new StreamReader(input); 

    while (!reader.EndOfStream)
        {
            arr[i] = Convert.ToDouble(reader.ReadLine());
            i++;
        }

    reader.Close();

推荐答案

这是您正在做的事情的完整示例.

This is a complete example of what you are doing.

string line;
List<double> values = new List<double>();
string path = Path.Combine(Application.StartupPath, "City.txt");

System.IO.StreamReader file = new System.IO.StreamReader(path);
while((line = file.ReadLine()) != null)
{
    values.Add(double.Parse(line));
}

file.Close();

基于"如何:一次读取一行文本文件( MSDN)"

这篇关于如何使用C#代码读取文件?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！