[英]reading in text file and spliting by comma in c#
我有一個文本文件,其格式如下
Number,Name,Age
我想將此文本文件第一列中的“ Number”讀入數組以查找重復項。 這是我嘗試讀取文件的兩種方法。
string[] account = File.ReadAllLines(path);
string readtext = File.ReadAllText(path);
但是每次我嘗試拆分數組以使第一個逗號左邊的內容都失敗時,我就會失敗。 有什么想法嗎? 謝謝。
您需要顯式拆分數據以訪問其各個部分。 否則程序如何確定用逗號分隔?
訪問我想到的數字的最簡單方法是這樣的:
var lines = File.ReadAllLines(path);
var firstLine = lines[0];
var fields = firstLine.Split(',');
var number = fields[0]; // Voilla!
您可以通過將數字解析為int或其他數字類型(如果確實是數字)來進一步研究。 另一方面,如果您只想測試唯一性,那么這實際上不是必需的。
如果要根據Number
重復所有行:
var numDuplicates = File.ReadLines(path)
.Select(l => l.Trim().Split(','))
.Where(arr => arr.Length >= 3)
.Select(arr => new {
Number = arr[0].Trim(),
Name = arr[1].Trim(),
Age = arr[2].Trim()
})
.GroupBy(x => x.Number)
.Where(g => g.Count() > 1);
foreach(var dupNumGroup in numDuplicates)
Console.WriteLine("Number:{0} Names:{1} Ages:{2}"
, dupNumGroup.Key
, string.Join(",", dupNumGroup.Select(x => x.Name))
, string.Join(",", dupNumGroup.Select(x => x.Age)));
如果您正在專門尋找string.split
解決方案,這是一種非常簡單的方法來做您想要的事情:
List<int> importedNumbers = new List<int>();
// Read our file in to an array of strings
var fileContents = System.IO.File.ReadAllLines(path);
// Iterate over the strings and split them in to their respective columns
foreach (string line in fileContents)
{
var fields = line.Split(',');
if (fields.Count() < 3)
throw new Exception("We need at least 3 fields per line."); // You would REALLY do something else here...
// You would probably want to be more careful about your int parsing... (use TryParse)
var number = int.Parse(fields[0]);
var name = fields[1];
var age = int.Parse(fields[2]);
// if we already imported this number, continue on to the next record
if (importedNumbers.Contains(number))
continue; // You might also update the existing record at this point instead of just skipping...
importedNumbers.Add(number); // Keep track of numbers we have imported
}
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