FileSystem.ReadAllText FileSystem.ReadAllText FileSystem.ReadAllText FileSystem.ReadAllText Method

Definition

Returns the contents of a text file as a String.

Overloads

ReadAllText(String) ReadAllText(String) ReadAllText(String) ReadAllText(String)

Returns the contents of a text file as a String.

ReadAllText(String, Encoding) ReadAllText(String, Encoding) ReadAllText(String, Encoding)

Returns the contents of a text file as a String.

ReadAllText(String) ReadAllText(String) ReadAllText(String) ReadAllText(String)

Returns the contents of a text file as a String.

public:
 static System::String ^ ReadAllText(System::String ^ file);
public static string ReadAllText (string file);
static member ReadAllText : string -> string
Public Shared Function ReadAllText (file As String) As String

Parameters

file
String String String String

Name and path of the file to read.

Returns

String containing the contents of the file.

Exceptions

The path is not valid for one of the following reasons: it is a zero-length string; it contains only white space; it contains invalid characters; or it is a device path (starts with \\.\); it ends with a trailing slash.

The file is in use by another process, or an I/O error occurs.

The path exceeds the system-defined maximum length.

A file or directory name in the path contains a colon (:) or is in an invalid format.

There is not enough memory to write the string to buffer.

The user lacks necessary permissions to view the path.

Examples

This example reads the contents of Test.txt into a string and then displays it in a message box.

Dim reader = My.Computer.FileSystem.ReadAllText("C:\test.txt")
MsgBox(reader)

This example reads the contents of the ASCII file Test.txt into a string and then displays it in a message box.

Dim reader = My.Computer.FileSystem.ReadAllText("C:\test.txt",
   System.Text.Encoding.ASCII)
MsgBox(reader)

Remarks

The ReadAllText method of the My.Computer.FileSystem object allows you to read from a text file. The contents of the file are returned as a string.

The file encoding can be specified if the contents of the file are in an encoding such as ASCII or UTF-8. If you are reading from a file with extended characters, you need to specify the file encoding using another overload of the ReadAllText method.

Do not make decisions about the contents of the file based on the name of the file. For example, the file Form1.vb may not be a Visual Basic source file. Verify all inputs before using the data in your application.

The following table lists an example of a task involving the My.Computer.FileSystem.ReadAllText method.

To See
Read from a text file How to: Read From Text Files in Visual Basic

Security

FileIOPermission
Controls the ability to access files and folders. Associated enumeration: Unrestricted.

See also

ReadAllText(String, Encoding) ReadAllText(String, Encoding) ReadAllText(String, Encoding)

Returns the contents of a text file as a String.

public:
 static System::String ^ ReadAllText(System::String ^ file, System::Text::Encoding ^ encoding);
public static string ReadAllText (string file, System.Text.Encoding encoding);
static member ReadAllText : string * System.Text.Encoding -> string

Parameters

file
String String String String

Name and path of the file to read.

encoding
Encoding Encoding Encoding Encoding

Character encoding to use in reading the file. Default is UTF-8.

Returns

String containing the contents of the file.

Exceptions

The path is not valid for one of the following reasons: it is a zero-length string; it contains only white space; it contains invalid characters; or it is a device path (starts with \\.\); it ends with a trailing slash.

The file is in use by another process, or an I/O error occurs.

The path exceeds the system-defined maximum length.

A file or directory name in the path contains a colon (:) or is in an invalid format.

There is not enough memory to write the string to buffer.

The user lacks necessary permissions to view the path.

Examples

This example reads the contents of Test.txt into a string and then displays it in a message box.

Dim reader = My.Computer.FileSystem.ReadAllText("C:\test.txt")
MsgBox(reader)

This example reads the contents of the ASCII file Test.txt into a string and then displays it in a message box.

Dim reader = My.Computer.FileSystem.ReadAllText("C:\test.txt",
   System.Text.Encoding.ASCII)
MsgBox(reader)

Remarks

The ReadAllText method of the My.Computer.FileSystem object allows you to read from a text file. The contents of the file are returned as a string.

The file encoding can be specified if the contents of the file are in an encoding such as ASCII or UTF-8. If you are reading from a file with extended characters, you need to specify the file encoding.

Do not make decisions about the contents of the file based on the name of the file. For example, the file Form1.vb may not be a Visual Basic source file. Verify all inputs before using the data in your application.

The following table lists an example of a task involving the My.Computer.FileSystem.ReadAllText method.

To See
Read from a text file How to: Read From Text Files in Visual Basic

Security

FileIOPermission
Controls the ability to access files and folders. Associated enumeration: Unrestricted.

See also

Applies to