C＃从文本文件（具有不同的数据类型）读取以获取数值总和

Question

So I have a .txt file that reads as the following:

-9
5.23
b
99
Magic
1.333
aa

how would I then loop through it to get the sum of all numerical values, and leave the non-numerical values untouched?

Answer 1

使用System.IO.StreamReader读取文本文件，并使用Double.TryParse方法解析数字数据。

Answer 2

using System;
using System.IO;
using System.Linq;

class Sample {
    static void Main(){
        string[] data = File.ReadAllLines("data.txt");
        double sum = data.Select( x => {double v ;Double.TryParse(x, out v);return v;}).Sum();
        Console.WriteLine("sum:{0}", sum);
    }
}

Answer 3

In your loop you can either:

• Use int.TryParse

• Use Regular Expresssion to match only integers.