英文:
Within a File StreamWriter scope how to get the Total lines counts in a file
问题
无法获得文件的总行数，因为在 StreamWriter 作用域内尝试读取文件会导致文件被另一个进程使用，从而引发错误消息。
英文:
How to do get the Total lines of the file when we are within in a StreamWriter scope.
Based on the total number of lines count I am writing some more lines at the end of the file.
I have tried the below code : But it throws an error message
The process cannot access the file ‘C:\a.txt ' because it is being used by another process.
var lineCount = File.ReadLines(outputFilePath).Count()
This is my Code
private string CreateAndPushFile(string fileName)
{
string outputFilePath = string.Format(@"{0}\{1}", “C:\\a.txt”, fileName);
using (StreamWriter output = new StreamWriter(outputFilePath))
{
// Creates the file header
string fileHeader =”kjhakljdhkjhkj”;
output.Write(fileHeader);
string batchControl = “1515151”; // This value comes from database
output.Write(batchControl);
// Here there is some other logic which will writes many lines to the File using foreach loop
string fileControl = “3123123”; // This value comes from database
output.WriteLine(fileControl);
// After this I need write a few more lines only if total number of lines in a File Total records multiple of 10
var lineCount = File.ReadLines(outputFilePath).Count(); // I am getting error here
int remainder;
Math.DivRem(lineCount, 10, out remainder);
for (int i = 1; i <= 10 - remainder; i++)
{
output.WriteLine(“9999999999999”);
}
}
}
答案1
得分: 1
private static void CreateAndPushFile(string outputFilePath) {
using (var output = new StreamWriter(outputFilePath)) {
// 创建文件头部
var fileHeader = "kjhakljdhkjhkj";
output.Write(fileHeader);
var batchControl = "1515151"; // 此值来自数据库
output.Write(batchControl);
// 这里有一些其他逻辑，将使用 foreach 循环写入文件的许多行
var fileControl = "3123123"; // 此值来自数据库
output.WriteLine(fileControl);
// 在此之后，只有在文件中的总行数是 10 的倍数时，才需要写入更多行
}
var lineCount = TotalLines(outputFilePath); // 在这里我遇到了错误
var remainder = lineCount % 10;
using (var output2 = new StreamWriter(outputFilePath, true)) { // 第二个参数用于追加
for (var i = 0; i < 10 - remainder; i++) {
output2.WriteLine("9999999999999");
}
}
}
private static int TotalLines(string filePath) {
using (var reader = new StreamReader(filePath)) {
char[] buffer = new char[1024];
var lineCount = 0;
while (!reader.EndOfStream) {
var charsRead = reader.Read(buffer, 0, 1024);
lineCount += buffer.Take(charsRead).Count(character => character == '\n');
}
return lineCount;
}
}
英文:
private static void CreateAndPushFile(string outputFilePath) {
using (var output = new StreamWriter(outputFilePath)) {
// Creates the file header
var fileHeader = "kjhakljdhkjhkj";
output.Write(fileHeader);
var batchControl = "1515151"; // This value comes from database
output.Write(batchControl);
// Here there is some other logic which will writes many lines to the File using foreach loop
var fileControl = "3123123"; // This value comes from database
output.WriteLine(fileControl);
// After this I need write a few more lines only if total number of lines in a File Total records multiple of 10
}
var lineCount = TotalLines(outputFilePath); // I am getting error here
var remainder = lineCount % 10;
using (var output2 = new StreamWriter(outputFilePath, true)) { // second parameter is for append
for (var i = 0; i < 10 - remainder; i++) {
output2.WriteLine("9999999999999");
}
}
}
private static int TotalLines(string filePath) {
using (var reader = new StreamReader(filePath)) {
char[] buffer = new char[1024];
var lineCount = 0;
while (!reader.EndOfStream) {
var charsRead = reader.Read(buffer, 0, 1024);
lineCount += buffer.Take(charsRead).Count(character => character == '\n');
}
return lineCount;
}
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论