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 headerstring fileHeader =”kjhakljdhkjhkj”;output.Write(fileHeader);string batchControl = “1515151”; // This value comes from databaseoutput.Write(batchControl);// Here there is some other logic which will writes many lines to the File using foreach loopstring fileControl = “3123123”; // This value comes from databaseoutput.WriteLine(fileControl);// After this I need write a few more lines only if total number of lines in a File Total records multiple of 10var lineCount = File.ReadLines(outputFilePath).Count(); // I am getting error hereint 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 headervar fileHeader = "kjhakljdhkjhkj";output.Write(fileHeader);var batchControl = "1515151"; // This value comes from databaseoutput.Write(batchControl);// Here there is some other logic which will writes many lines to the File using foreach loopvar fileControl = "3123123"; // This value comes from databaseoutput.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 herevar remainder = lineCount % 10;using (var output2 = new StreamWriter(outputFilePath, true)) { // second parameter is for appendfor (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;}}
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