And I understand why since I have been doing this for years. Take a look at the simplicity of this approach:. The example produces a file named output.
This approach can be fine for smaller text files, but shouldn't be the default choice when handling larger amounts of data. Let's create a scenario for the rest of the post, where a large amount of data should be stored and use WriteAllText to write the data to a file:. In the example, I generate 1 million lines and store them in the output.
On my machine, the code takes around ms. That's pretty impressive for most scenarios, but I'm sure we can do better. Where the WriteAllText method writes everything at once, you may need to write in batches. Let's reuse the StringBuilder from before to illustrate how this can be done using the File. CreateText method:. The CreateText method returns a StreamWriter object that we can use to publish multiple lines to a file or even write to the file one char at a time.
When disposing of the StreamWriter , the buffer is flushed to the underlying stream, and the filehandle is released. You can manually call the Flush method to get the same result.
As an alternative to the previous methods or if you simply need to append text to an existing file, there are append-methods available as static methods too:.
Both methods append text either as a single string or multiple lines in a single write. You can split lines in multiple iterations using the AppendText method:. Be aware to only call AppendText once during the duration of having to write content to a file. I sometimes see code like this:. As we will see later in this post, this will be very performance heavy since the file is touched multiple times on the disk. I've seen it so many times. Customer complaints that the UI "hangs" when clicking something the involves reading from or writing to a large file.
This will perform much better than the previous 2 examples. In this example, you will see that we are doing the same process as the previous example, but we are setting a larger buffer of 65k. This performed very well in my tests. In some tests, it performed faster than all the next two examples. This can be explained by having a larger buffer which means the StreamWriter is writing to the hard drive less often. In this snippet, we are creating a string and then adding to that string times.
We will then write this large string one time to the hard drive. This will perform well and does not stress the hard drive, but there is still one slightly faster way to do this. The only difference in this example and the previous is we are using a StringBuilder to create the larger string before writing one time to the hard drive. When doing lots of string operations the StringBuilder is faster than just working with a declared string.
This code snippet performs better than the rest of the above examples except the StreamWriter with a larger buffer. I set up a stopwatch to time how long it took to run the above sample of code. As control goes to the catch block, the WriteErrorLog method will be called and the error log will be created inside the bin folder of the application.
You will find an errorLog. With the help of these given details, developers can understand the type of the error and its origin.
View All. NET Application. Shreesh Raj Updated date Nov 23, Next Recommended Reading. Net Core 6. Create A. Write StringBuilder. Writes the string representation of a string builder to the current string. Write Char. Writes a character to the string. Writes the string representation of a span of chars to the current string. In this article. How to: Write Text to a File. How to: Read Text from a File.
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