WriteLine Storage ; Console. WriteLine Outflow ; Console. WriteLine storage ; Console. WriteLine outflow ;. ReadAllLines reads all lines at once, which is handy, but it may not be appropriate for large files or situations where you may only need to read part of a file. Can you help me? None ; permission. PathDiscovery; permission. RevertAssert ;. Read in a series of numbers from a text-file the data is given below. For each row in the file, calculate the sum of the values of that vector.
Each of the vector sums must then be written to a new file, sorted in ascending order. The process would be something like this: Open a StreamWriter to a temporary file. Open a StreamReader to the target file. For each line: Split the text into columns based on a delimiter.
Check the columns for the values you want to replace, and replace them. Join the column values back together using your delimiter. Write the line to the temporary file. When you are finished, delete the target file, and move the temporary file to the target file path. Split line. ToArray ; writer. Length]; if columns. Length throw new InvalidOperationException string. WriteLine string. Delete sourcePath ; File.
Move tempPath, sourcePath ;. Improve this answer. That's definitely the simple and most straight forward way to go. One thing, I didn't think of the size. The final File. You can't read a gcode file line by line because: A You can have multiple commands on a single line.
B One command may span multiple lines. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more.
Read one line at a time Ask Question. Asked 8 years, 7 months ago. Active 4 years, 4 months ago. Viewed 4k times. StreamReader file. FileName ; textBox1. ReadToEnd ; OpenFile. Matches this. ToInt32 ExtractNumbers n. Parse ExtractNumbers n. My suggestion is to use File. ReadLines because it is clean and efficient. If you require special sharing options for example you use FileShare.
ReadWrite , you can use your own code but you should increase the buffer size. If you're using. NET 4, simply use File. ReadLines which does it all for you. I suspect it's much the same as yours, except it may also use FileOptions.
SequentialScan and a larger buffer seems very small. While File. ReadAllLines is one of the simplest ways to read a file, it is also one of the slowest. If you're just wanting to read lines in a file without doing much, according to these benchmarks , the fastest way to read a file is the age old method of:. However, if you have to do a lot with each line, then this article concludes that the best way is the following and it's faster to pre-allocate a string[] if you know how many lines you're going to read :.
There's a good topic about this in Stack Overflow question Is 'yield return' slower than "old school" return? ReadAllLines loads all of the lines into memory and returns a string[]. All well and good if the file is small. If the file is larger than will fit in memory, you'll run out of memory.
ReadLines, on the other hand, uses yield return to return one line at a time. With it, you can read any size file. It doesn't load the whole file into memory. Say you wanted to find the first line that contains the word "foo", and then exit. Using ReadAllLines, you'd have to read the entire file into memory, even if "foo" occurs on the first line.
With ReadLines, you only read one line. Which one would be faster? If you have enough memory, I've found some performance gains by reading the entire file into a memory stream , and then opening a stream reader on that to read the lines. As long as you actually plan on reading the whole file anyway, this can yield some improvements. You can't get any faster if you want to use an existing API to read the lines.
But reading larger chunks and manually find each new line in the read buffer would probably be faster. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What's the fastest way to read a text file line-by-line? Ask Question. Asked 10 years, 2 months ago. Active 1 year, 7 months ago. Viewed k times.
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