如何在C#中获取文件中的行数？
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How to get number of rows in file in C#?
提问by
I need to initialize 2D array and first column is every row in a file. How do I get the number of rows in a file?
我需要初始化二维数组，第一列是文件中的每一行。如何获取文件中的行数？
回答by Peter Lillevold
You would have to open the file reading in each line to get the count:
您必须打开每行中的文件读取以获取计数：
var lines = File.ReadAllLines(filename);
var count = lines.Length;
回答by Chris Doggett
回答by JoshBerke
You could do:
你可以这样做：
System.IO.File.ReadAllLines("path").Length
Edit
编辑
As Joe points out, I left out all the standard error handling and didn't show you would then use this same array to process in the rest of your code.
正如 Joe 指出的那样，我遗漏了所有标准错误处理，并且没有表明您将使用相同的数组来处理其余代码。
回答by Bullines
There may be a more efficient way for larger files, but you could start with something like:
对于较大的文件，可能有更有效的方法，但您可以从以下内容开始：
int l_rowCount = 0;
string l_path = @"C:\Path\To\Your\File.txt";
using (StreamReader l_Sr = new StreamReader(l_path))
{
while (l_Sr.ReadLine())
l_rowCount++;
}
回答by Adam Robinson
It would probably be more useful for you to actually open the file, read the lines into a List, then create your 2D array.
实际打开文件，将行读入列表，然后创建二维数组可能对您更有用。
List<string> lines = new List<string>()
using(System.IO.StreamReader file = new System.IO.StreamReader(fileName))
{
while(!file.EndOfStream) lines.Add(file.ReadLine());
}
You can then use your lineslist to create your array.
然后您可以使用您的lines列表来创建您的阵列。
回答by Mutant
int counter = 0;
string line;
System.IO.StreamReader file = new System.IO.StreamReader("c:\t1.txt");
while((line = file.ReadLine()) != null)
{
counter++;
}
file.Close();
counter will give you number of lines. you can insert line into your array as well withthe loop.
计数器会给你行数。您也可以使用循环在数组中插入行。
回答by Crash893
could you go with something more exotic like a linq statement
你能不能用一些更奇特的东西，比如 linq 语句
Count * from textfile
从文本文件中计算 *
something like that?
类似的东西？
