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author | chai <215380520@qq.com> | 2023-05-12 09:24:40 +0800 |
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committer | chai <215380520@qq.com> | 2023-05-12 09:24:40 +0800 |
commit | 2a1cd4fda8a4a8e649910d16b4dfa1ce7ae63543 (patch) | |
tree | a471fafed72e80b4ac3ac3002e06c34220dd6058 /ThirdParty/CsvHelper-master/src/CsvHelper.Website/input/examples/prerequisites/reading-and-writing-files/index.md | |
parent | b8a694746562b37dc8dc5b8b5aec8612bb0964fc (diff) |
*misc
Diffstat (limited to 'ThirdParty/CsvHelper-master/src/CsvHelper.Website/input/examples/prerequisites/reading-and-writing-files/index.md')
-rw-r--r-- | ThirdParty/CsvHelper-master/src/CsvHelper.Website/input/examples/prerequisites/reading-and-writing-files/index.md | 65 |
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diff --git a/ThirdParty/CsvHelper-master/src/CsvHelper.Website/input/examples/prerequisites/reading-and-writing-files/index.md b/ThirdParty/CsvHelper-master/src/CsvHelper.Website/input/examples/prerequisites/reading-and-writing-files/index.md new file mode 100644 index 0000000..c5f4f8f --- /dev/null +++ b/ThirdParty/CsvHelper-master/src/CsvHelper.Website/input/examples/prerequisites/reading-and-writing-files/index.md @@ -0,0 +1,65 @@ +# Reading and Writing Files + +To open a file for reading or writing, we can use `System.IO.File`. + +```cs +using (var stream = File.OpenRead("path\\to\\file.csv")) +{ +} + +using (var stream = File.OpenWrite("path\\to\\file.csv")) +{ +} +``` + +These both return a `FileStream` for working with our file. Since our data is text, we will need to use a `StreamReader` and `StreamWriter` to read and write the text. + +```cs +using (var stream = File.OpenRead("path\\to\\file.csv")) +using (var reader = new StreamReader(stream)) +{ +} + +using (var stream = File.OpenWrite("path\\to\\file.csv")) +using (var writer = new StreamWriter(stream)) +{ +} +``` + +`StreamReader` and `StreamWriter` have shortcuts for doing this. + +```cs +using (var reader = new StreamReader("path\\to\\file.csv")) +{ +} + +using (var writer = new StreamWriter("path\\to\\file.csv")) +{ +} +``` + +CsvHelper doesn't know anything about your encoding, so if you have a specific encoding, you'll need to specify that in your stream. + +```cs +using (var reader = new StreamReader("path\\to\\file.csv", Encoding.UTF8)) +{ +} + +using (var writer = new StreamWriter("path\\to\\file.csv", Encoding.UTF8)) +{ +} +``` + +`CsvReader` and `CsvWriter` take a `TextReader` and `TextWriter` in their constructors. `TextReader` and `TextWriter` are `abstract` classes for reading and writing text. `StreamReader` inherits `TextReader` and `StreamWriter` inherits `TextWriter`, so we can use those with `CsvReader` and `CsvWriter`. + +```cs +using (var reader = new StreamReader("path\\to\\file.csv")) +using (var csv = new CsvReader(reader)) +{ +} + +using (var writer = new StreamWriter("path\\to\\file.csv")) +using (var csv = new CsvWriter(writer)) +{ +} +``` |