A little experience uploaded by the file

Recently, the author is busy with a project, involving an uploading problem, of course, this problem is a relatively common problem, and many people have written a good article in this area. Here, I only write what I want to use system.Web.ui.htmlControls.htmlinputFile to achieve the features I want:

First, put a few controls on the interface for collecting information:

Protected system.web.ui.webcontrols.button button1; // upload button protected system.web.ui.webcontrols.label label1; // Used to display information protected system.web.ui.webcontrols.label label2; // The display information protected system.Web.ui.WebControls.Label label3 ;; // is used to display information protected system.web.ui.webcontrols.label label4 ;; // is used to display information protected system.web.ui.htmlControls. HTMLINPUTFILE FILE1; // Upload control

At the same time, since the IO operation is transmitted up, the following namespace is introduced:

Using system.io;

Ok, let's start writing procedures:

First we have to judge whether the user chooses to upload files, we can use the following to implement:

IF (file1.postedfile.contentLENGTH> 0)

If the user has the file uploaded, then:

String name = file1.postedfile.FileName; // Get the input file name INT i = name.lastIndexof ("."); string newname = name.substring (i); // Get the extension of the file // change below "C: //" to the address you want to save. DateTime now; string strname = now.year.tostring () now.month.tostring () NOW.DAY.TOSTRING () file1.postedfile.contentLENGTH.TOSTRING () newname; // pair file Rename it. The name is: year month day file size.

String path = "c: //" strname; // Set the location of the upload file, set to the virtual directory:

// String path = server.mappath ("userimage ///") strname; stored in the specified virtual directory IF (file.exists (path)) // does not have {label1.text = "this file name in the server There is already !! "; label2.text =" "; label3.text =" "; return;} file1.postedfile.saves (path); // Store file // Various properties of the upload file. Label1.text = "Upload File Name:" File1.postedFile.FileName; Label2.Text = "Upload File Type:" File1.postedFile.ContentType; Label3.Text = "Upload File Size:" File1.PostedFile.ContentLength .Tostring (); here, the uploaded program is finished, but there are some places to pay attention to:

To add attributes in Form: eNCTYPE = "Multipart / Form-Data" otherwise an error that does not reference an object will be referenced to an instance. The full program is as follows:

using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls Using system.web.ui.htmlcontrols; using system.io;

Namespace myhomewebapp.uploadtest {///