The contents of the file may not be what is expected, and methods to read from the file may fail. Verify all inputs before using the data in your application. For example, the file Form1.vb may not be a Visual Basic source file. The user lacks necessary permissions to view the path ( SecurityException).ĭo not make decisions about the contents of the file based on the name of the file. Create a resource file in a Visual Studio Project Right click and choose Add, New Item., browse to Resource File Template. There is not enough memory to write the string to buffer ( OutOfMemoryException). The path exceeds the system-defined maximum length ( PathTooLongException).Ī file or directory name in the path contains a colon (:) or is in an invalid format ( NotSupportedException). The file is in use by another process or an I/O error occurs ( IOException). The file does not exist ( FileNotFoundException). The path is not valid because it is Nothing ( ArgumentNullException). 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 ( ArgumentException). The following conditions may cause an exception: Dim fileReader As StringįileReader = My.("C:\test.txt", The following example reads the contents of the UTF32 file test.txt into a string and then displays it in a message box. Use the ReadAllText method of the My.Computer.FileSystem object to read the contents of a text file into a string, supplying the path and file encoding type. Dim fileReader As StringįileReader = My.("C:\test.txt") ![]() The following example reads the contents of test.txt into a string and then displays it in a message box. ![]() Use the ReadAllText method of the My.Computer.FileSystem object to read the contents of a text file into a string, supplying the path. You can test for the end of the file using the EndOfStream method of the StreamReader object. ![]() You can use the ReadLine method of the StreamReader object to read a file one line at a time. The OpenTextFileReader method returns a StreamReader object. To read a file a single line of text at a time, use the OpenTextFileReader method of the My.Computer.FileSystem object.
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