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Using I/O
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file called FIRSTDAT to a file called SECONDDAT, use the following command line:
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PART I
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CopyFile FIRSTDAT SECONDDAT */ using System; using SystemIO; class CopyFile { static void Main(string[] args) { if(argsLength != 2) { ConsoleWriteLine("Usage: CopyFile From To"); return; } // Copy the files try { FileCopy(args[0], args[1]); } catch(IOException exc) { ConsoleWriteLine("Error Copying File\n" + excMessage); } } }
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As you can see, this version of the program does not require that you create a FileStream or release resources The Copy( ) method handles all this for you Also notice that this version will not overwrite an existing file You might want to try using the second version of Copy( ), which does allow the destination to be overwritten
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Using Exists( ) and GetLastAccessTime( )
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Using File methods, it is quite easy to obtain information about a file We will look at two such methods: Exists( ) and GetLastAccessTime( ) The Exists( ) method determines if a file exists GetLastAccessTime( ) returns the date and time at which a file was last accessed These two methods are shown here: static bool Exists(string path) static DateTime GetLastAccessTime(string path) For both methods, path specifies the file about which to obtain information Exists( ) returns true if the file exists and can be accessed by the calling process GetLastAccessTime( ) returns a DateTime structure that contains the date and time the file was last accessed (DateTime is described later in this book, but its ToString( ) method automatically creates a humanreadable form of the date and time) A number of exceptions relating to the use of an invalid argument or an invalid permission are possible However, it will not throw an IOException The following program shows Exists( ) and GetLastAccessTime( ) in action It determines if a file called testtxt exists If it does, the time it was last accessed is displayed
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// Use Exists() and GetLastAccessTime() using System; using SystemIO;
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Part I:
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The C# Language
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class ExistsDemo { static void Main() { if(FileExists("testtxt")) ConsoleWriteLine("File exists It was last accessed at " + FileGetLastAccessTime("testtxt")); else ConsoleWriteLine("Does Not Exist"); } }
Sample output is shown here:
File exists It was last accessed at 11/1/2009 5:30:17 PM
You can also obtain a file s time of creation by calling GetCreationTime( ) and the time at which it was last written to by calling GetLastWriteTime( ) UTC versions of these methods are also available (UTC stands for coordinated universal time) You might want to experiment with these
Converting Numeric Strings to Their Internal Representation
Before leaving the topic of I/O, we will examine a technique useful when reading numeric strings As you know, WriteLine( ) provides a convenient way to output various types of data to the console, including numeric values of the built-in types, such as int and double Thus, WriteLine( ) automatically converts numeric values into their human-readable form However, a parallel input method that reads and converts strings containing numeric values into their internal, binary format is not provided For example, there is no version of Read( ) that reads from the keyboard a string such as 100 and then automatically converts it into its corresponding binary value that can be stored in an int variable Instead, there are other ways to accomplish this task Perhaps the easiest is to use a method that is defined for all of the built-in numeric types: Parse( ) Before we begin, it is necessary to state an important fact: all of C# s built-in types, such as int and double, are actually just aliases (that is, other names) for structures defined by the NET Framework In fact, the C# type and NET structure type are indistinguishable One is just another name for the other Because C# s built-in types are supported by structures, they have members defined for them For the numeric types, the NET structure names and their C# keyword equivalents are given here:
NET Structure Name Decimal Double Single Int16 Int32 Int64 C# Name decimal double float short int long
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