拆分字符串并转换为double值 [英] split string and convert into double values

问题描述

我使用streamreader.File.readallLine（）方法在c＃中读取文件，每行包含三个浮点值。如何通过拆分字符串来提取每个浮点值？

下面给出了我的代码用于拆分字符串，但它没有正常工作！

i read file in c# using streamreader.File.readallLine() method and every line contains three float values.How to extract every float value by splitting string?
My code is given below for split string but it not working proporly!

try {
               
                var lines = File.ReadAllLines("InFIle.txt").Skip(1).ToList();
                for (int i = 0; i < lines.Count; i++)
                {
                    var line = lines[i];
                    var columns = line.Split('\n');
                }             

            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.Message);
            }

以-610 \ t -701 \ t -701格式收到字符串，如何提取第二列和第三列值？

Received string in "-610\t -701\t -701" format,how to extract second and third column value?

推荐答案

您可以获得如下的十进制值（如果您的字符串总是如上所述）

You can get decimal values like below(If your string will always like above)

try
           {

               var lines = File.ReadAllLines("InFIle.txt").Skip(1).ToList();
               for (int i = 0; i < lines.Count; i++)
               {
                   var line = lines[i];
                   var columns = line.Split('\n');
                   for (int columnsLoop = 0; columnsLoop < columns.Length; columnsLoop++)
                   {
                       string[] DecimalsArray = columns[columnsLoop].Split('\t');
                       decimal firstVal = Convert.ToDecimal(DecimalsArray[0]);
                       decimal secondVal = Convert.ToDecimal(DecimalsArray[1]);
                       decimal thirdVal = Convert.ToDecimal(DecimalsArray[2]);
                   }

               }

           }
           catch (Exception exc)
           {
               MessageBox.Show(exc.Message);
           }

假设您希望将类似-610的数字实际转换为Float数字类型：

Assuming that you want numbers like "-610" to actually be converted to the Float numeric type:

// required
using System.Collections.Generic;
using System.Linq;

// inside your Class, Form, etc.
private string floatStr = @"-610	-701	-701
-607	-699	-699
-606	-697	-697
-604	-696	-696
-603	-696	-695
-603	-696	-695";

// split on tab character
private char[] splitChar = new char[] {'\t'};

// to hold result of split
private string[] stringAry;

// to hold list of float result
private List<float> floatList;

private void stringsToFloat (object sender, EventArgs e)
{
    // get rid of newline and linefeed
    floatStr = floatStr.Replace('\r', '\t');
    floatStr = floatStr.Replace('\n', '\t');

    // split
    stringAry = floatStr.Split(splitChar, StringSplitOptions.RemoveEmptyEntries);

    // use Linq to convert to List<float>
    floatList = stringAry.Select(float.Parse).ToList();
}</float>

调用此方法后，'floatStr将包含一个包含18个浮点值的List。



请注意，这里没有验证;如果其中一个字符串转换为浮点数的条目不正确会发生什么？

After this method is called, 'floatStr will contain a List of 18 float values.

Note that there's no validation here; what happens if there's an incorrect entry for one of the string to be converted to a float ?

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