C# filestream read file into string

The following example reads the contents from a FileStream and writes it into another FileStream. This method overrides Read. The offset parameter gives the offset of the byte in array the buffer index at which to begin reading, and the count parameter gives the maximum number of bytes to be read from this stream.

The returned value is the actual number of bytes read, or zero if the end of the stream is reached. If the read operation is successful, the current position of the stream is advanced by the number of bytes read.

If an exception occurs, the current position of the stream is unchanged. The Read method returns zero only after reaching the end of the stream. Otherwise, Read always reads at least one byte from the stream before returning. If no data is available from the stream upon a call to Read , the method will block until at least one byte of data can be returned. An implementation is free to return fewer bytes than requested even if the end of the stream has not been reached.

Use BinaryReader for reading primitive data types. When we use FileStream , we work with bytes. For more convenient work with text data, we can use StreamWriter and StreamReader. In the following example, we use FileStream in combination with StreamWriter.

The example writes text data into a file. For convenience, we use the StreamWriter , which writes characters to a stream in a particular encoding.

The example reads a text file and prints its contents. We read the data as bytes, transform them into strings using UTF8 encoding and finally, write the strings to the console. With File. OpenRead we open a file for reading.

Chavan Devendra D. Chavan 8, 4 4 gold badges 29 29 silver badges 33 33 bronze badges. Did you compare against File. ReadAllText , too?? ILSpy suggests that File. ReadAllText is simply a wrapper over StreamReader. I am guessing that the additional layer should perform slightly slower than StreamReader. Great answer. Perhaps a little bit much explanation for those just looking for the fix, but it deserves at least as many votes as the chosen answer.

You can also find the code here: referencesource. What I don't get, is why there is this significant difference in speed if ReadAllText is just a wrapper for streamReader. ReadToEnd ;? Mouna Cheikhna Neil Barnwell Neil Barnwell ReadAllText method Some important remarks: This method opens a file, reads each line of the file, and then adds each line as an element of a string.

The file handle is guaranteed to be closed by this method, even if exceptions are raised. Comment is late I know, but a little confused on your benchmarks here and on the linked page.

It appears to be testing read speeds only and not loading into an entire string. The second code snippet is reading a line at a time and not doing any appending so the "do what you have to here" would need to have a string builder or string to hold the data.

At which point the memory used to add more data would change the test results. So s will usually be the same size assuming a fixed width file so the memory will be set for the size of a line and data won't need to be copied to new memory. ReadAllLines "Path" ;. Dilshod Dilshod 3, 2 2 gold badges 33 33 silver badges 63 63 bronze badges. ReadToEnd ;. Maxim V. Pavlov Maxim V. Pavlov 9, 14 14 gold badges 68 68 silver badges bronze badges.

Cris sorry. StreamReader VB. Close FileStream VB. Read b, 0, b. GetString b, 0, b. Length Loop fs. Close Result FileStream is obviously faster in this test. The File class is defined in the System. What is System C? System is a namespace and Console is a class in that namespace. The using keyword can be used so that the complete name is not required, as in the following example: C Copy.

What is the file extension for C? A CS file is a source code file written in C pronounced "C Sharp" , an object-oriented programming language created by Microsoft for use with the. NET Framework. It is used for developing a range of applications, from simple desktop programs to applications for distributed environments. What is File C? A file is a collection of data stored in a disk with a specific name and a directory path.

When a file is opened for reading or writing, it becomes a stream. The stream is basically the sequence of bytes passing through the communication path. What is System namespace in C? System Namespace. The System namespace contains fundamental classes and base classes that define commonly-used value and reference data types, events and event handlers, interfaces, attributes, and processing exceptions.

What is System IO file? In the. NET Framework, the System.