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You can use the FileInfo.Open() method to open existing files as well as create new files with far more precision than FileInfo.Create(). Once the call to Open() completes, you are returned a FileStream object. Ponder the following logic: static void Main(string[] args) { ... // Make a new file via FileInfo.Open(). FileInfo f2 = new FileInfo(@"C:\Test2.dat"); FileStream fs2 = f2.Open( FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None); // Use the FileStream object... // Close down file stream. fs2.Close(); } This version of the overloaded Open() method requires three parameters. The first parameter specifies the general flavor of the I/O request (e.g., make a new file, open an existing file, append to a file, etc.), which is specified using the FileMode enumeration: public enum FileMode { // Specifies that the operating system should create a new file. // If the file already exists, a System.IO.IOException is thrown. CreateNew, // Specifies that the operating system should create a new file. // If the file already exists, it will be overwritten. Create, Open, // Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. OpenOrCreate, Truncate, Append } The second parameter, a value from the FileAccess enumeration, is used to determine the read/write behavior of the underlying stream: public enum FileAccess { Read, Write, ReadWrite } Finally, you have the third parameter, FileShare, which specifies how the file is to be shared among other file handlers. Here are the core names: public enum FileShare { None, Read, Write, ReadWrite }

While the FileInfo.Open() method allows you to obtain a file handle in a very flexible manner, the FileInfo class also provides members named OpenRead() and OpenWrite(). As you might imagine, these methods return a properly configured read-only or write-only FileStream type, without the need to supply various enumeration values. Like FileInfo.Create() and FileInfo.Open(), OpenRead() and OpenWrite() return a FileStream object: static void Main(string[] args) { ... // Get a FileStream object with read-only permissions. FileInfo f3 = new FileInfo(@"C:\Test3.dat"); FileStream readOnlyStream = f3.OpenRead(); // Use the FileStream object... readOnlyStream.Close(); // Now get a FileStream object with write-only permissions. FileInfo f4 = new FileInfo(@"C:\ Test4.dat"); FileStream writeOnlyStream = f4.OpenWrite(); // Use the FileStream object... writeOnlyStream.Close(); }

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Another open-centric member of the FileInfo type is OpenText(). Unlike Create(), Open(), OpenRead(), and OpenWrite(), the OpenText() method returns an instance of the StreamReader type, rather than a FileStream type: static void Main(string[] args) { ... // Get a StreamReader object. FileInfo f5 = new FileInfo(@"C:\boot.ini"); StreamReader sreader = f5.OpenText(); // Use the StreamReader object... sreader.Close(); } As you will see shortly, the StreamReader type provides a way to read character data from the underlying file.

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Set xlSheet = Sheets("Sheet3") xlSheet.Activate Range("A3").Activate Selection.CurrentRegion.Select Selection.ClearContents Range("A1").Select Sheets("Sheet2").Activate 'make sure we're on the right sheet Set cnn = New ADODB.Connection sConnString = "Provider=SQLNCLI;Server=MyServerName\SQLEXPRESS;" & "Database=AdventureWorks;Trusted_Connection=yes;" cnn.Open sConnString Set cmd = New ADODB.Command cmd.ActiveConnection = cnn iMgrID = GetMgrID sMgrName = GetMgrName Set param = New ADODB.Parameter With param .Name = "ManagerID" .Type = adInteger .Value = iMgrID End With With cmd .CommandType = adCmdStoredProc .CommandText = "uspGetManagerEmployees" .Parameters.Append param End With Set rs = New ADODB.Recordset Set rs = cmd.Execute xlSheet.Activate 'activate the display sheet Range("A1").Value = "Employee List for: " & sMgrName Range("A1").Font.Bold = True For i = 1 To rs.Fields.Count ActiveSheet.Cells(3, i).Value = rs.Fields(i - 1).Name Next i xlSheet.Range(xlSheet.Cells(3, 1), _ xlSheet.Cells(3, rs.Fields.Count)).Font.Bold = True

The final two methods of interest at this point are CreateText() and AppendText(), both of which return a StreamWriter reference, as shown here:

static void Main(string[] args) { ... FileInfo f6 = new FileInfo(@"C:\Test5.txt"); StreamWriter swriter = f6.CreateText(); // Use the StreamWriter object... swriter.Close(); FileInfo f7 = new FileInfo(@"C:\FinalTest.txt"); StreamWriter swriterAppend = f7.AppendText(); // Use the StreamWriter object... swriterAppend.Close(); } As you would guess, the StreamWriter type provides a way to write character data to the underlying file.

The File type provides functionality almost identical to that of the FileInfo type, using a number of static members. Like FileInfo, File supplies AppendText(), Create(), CreateText(), Open(), OpenRead(), OpenWrite(), and OpenText() methods. In fact, in many cases, the File and FileInfo types may be used interchangeably. To illustrate, each of the previous FileStream examples can be simplified by using the File type instead: static void Main(string[] args) { // Obtain FileStream object via File.Create(). FileStream fs = File.Create(@"C:\Test.dat"); fs.Close(); // Obtain FileStream object via File.Open(). FileStream fs2 = File.Open(@"C:\Test2.dat", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None); fs2.Close(); // Get a FileStream object with read-only permissions. FileStream readOnlyStream = File.OpenRead(@"Test3.dat"); readOnlyStream.Close(); // Get a FileStream object with write-only permissions. FileStream writeOnlyStream = File.OpenWrite(@"Test4.dat"); writeOnlyStream.Close(); // Get a StreamReader object. StreamReader sreader = File.OpenText(@"C:\boot.ini"); sreader.Close();

Now we ve got the display shown in Figure 11-6.

// Get some StreamWriters. StreamWriter swriter = File.CreateText(@"C:\Test3.txt"); swriter.Close(); StreamWriter swriterAppend = File.AppendText(@"C:\FinalTest.txt"); swriterAppend.Close(); }

ActiveSheet.Range("A4").CopyFromRecordset rs xlSheet.Select Range("A3").Select Selection.CurrentRegion.Select Selection.Columns.AutoFit Range("A1").Select rs.Close cnn.Close Set Set Set Set Set End Sub cmd = Nothing param = Nothing rs = Nothing cnn = Nothing xlSheet = Nothing

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