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Figure 10.14 The HTML file field and the Upload button.
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In the code-behind page, the button click event method must have the following code to process the uploaded file:
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Private Sub Button1_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button1.Click Dim fileTarget As String = C:\MyUploadDocs\ If UpLoadControl.PostedFile Is Nothing Then Response.Write( No file uploaded.<br> ) Return End If fileTarget &= _ Path.GetFileName(UpLoadControl.PostedFile.FileName.ToString()) If File.Exists(fileTarget) Then Response.Write( File already exists.<br> ) Return End If Response.Write( File Uploaded to: + fileTarget + <BR> ) Response.Write( _ UpLoadControl.PostedFile.ContentType.ToString() + <BR> ) Response.Write( _ UpLoadControl.PostedFile.ContentLength.ToString() + <BR> ) UpLoadControl.PostedFile.SaveAs(fileTarget) End Sub
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The upload control can be used to upload very large files. Care should be taken to ensure that the destination of the uploaded files does not allow execution of an uploaded file.
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Two Directory classes assist in browsing and manipulation of the operating system directories: Directory and DirectoryInfo. These classes contain a fair amount of overlapping methods. If directory information or manipulation needs to take place only once on a directory, then use the Directory class. If there will be repeated calls to access the directory information, then use the DirectoryInfo class.
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The Directory class contains many static methods for accessing and manipulating a directory; thus, there is no need to create an instance of the Directory class. When specifying a path, the path may be absolute or relative, and it may be a UNC path. These methods are listed in Table 10.4.
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Table 10.4 Directory Class Methods DESCRIPTION Creates a new directory and any required subdirectories. Deletes the specified directory. Returns a Boolean true if the specified directory exists. Gets and sets the creation time of the specified folder. Gets and sets the current default directory. Returns a string array containing a list of all directories that are under the specified directory. Gets the name of the root directory or volume information of the specified directory. For example, if c:\test\abc\def is specified as the directory, this method returns C:\ as the directory root. Returns a string array containing a list of files that are in the specified directory. Returns a string array containing the list of all files and folders in the specified directory. Gets and sets the last access time of the specified directory. Gets and sets the last write time of the specified directory.
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DIRECTORY METHOD CreateDirectory Delete Exists GetCreationTime SetCreationTime GetCurrentDirectory SetCurrentDirectory GetDirectories GetDirectoryRoot
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GetFiles GetFileSystemEntries GetLastAccessTime SetLastAccessTIme GetLastWriteTime SetLastWriteTime
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Table 10.4 (continued) DESCRIPTION Retrieves a list of logical drives on the current machine. This method does not return mapped drives. Returns the parent directory of the specified directory. Moves the specified directory to a new location.
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DIRECTORY METHOD GetLogicalDrives
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The following examples show how the Directory class can be used. Notice that an instance of the Directory class does not need to be created, since the methods are static.
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Get All File and Folder Entries
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The following code is an example of reading the files and folders in a directory and using the list to populate a ListBox.
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Private Sub Button25_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button25.Click Dim f As String Dim d As String d = C:\DEVELOPMENT\ORDERENTRYSYSTEM\OrderEntrySystemSolution For Each f In Directory.GetFileSystemEntries(d) ListBox1.Items.Add(f) Next End Sub
Figure 10.15 shows the browser output. Notice that the full path is retrieved for each entry, even though they are in the same directory.
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The following code shows how to obtain a list of logical drives that are on the current machine. This list will not include mapped drives, however.
Private Sub Button27_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button27.Click Dim d As String For Each d In Directory.GetLogicalDrives() ListBox1.Items.Add(d) Next End Sub
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Figure 10.15 The Directory class can be used to retrieve a list of files and folders and populate a ListBox.
Figure 10.16 shows the browser output. Notice that the drives have the colon and backslash already appended to each letter.