asp.net file upload class (get file suffix name, save file, add text watermark) _ Practical skills

Copy Code code as follows:

Using System;
Using System.Data;
Using System.Configuration;
Using System.Web;
Using System.Web.Security;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.WebControls.WebParts;
Using System.Web.UI.HtmlControls;
Using System.Drawing;
Using System.IO;
Using System.Drawing.Imaging;

Namespace EC
{
<summary>
Upload class
</summary>
public class Uploadobj
{

Public Uploadobj ()
{
//
TODO: Add constructor logic here
//
}
<summary>
Enumeration of types that allow file uploads
</summary>
public enum FileType
{
Jpg,gif,bmp,png
}

#region Get file suffix
<summary>
Get file suffix
</summary>
<param name= "filename" > file name </param>
<returns></returns>
public static string Getfileextends (string filename)
{
string ext = null;
if (filename. IndexOf ('. ') > 0)
{
string[] fs = filename. Split ('. ');
ext = Fs[fs. LENGTH-1];
}
return ext;
}
#endregion

#region Detection file is legal
<summary>
Detecting whether the uploaded file is legitimate
</summary>
<param name= "fileextends" > File suffix name </param>
<returns></returns>
public static bool Checkfileextends (string fileextends)
{
BOOL status = FALSE;
Fileextends = Fileextends.tolower ();
string[] Fe = Enum.getnames (typeof (FileType));
for (int i = 0; i < Fe. Length; i++)
{
if (fe[i). ToLower () = = Fileextends)
{
Status = TRUE;
Break
}
}
return status;
}
#endregion

#region Save a file
<summary>
Save File
</summary>
<param name= "Fpath" > Full path, Server.MapPath () </param>
<param name= "Myfileupload" > Upload control </param>
<returns></returns>
public static string Photosave (String Fpath,fileupload myfileupload)
{
string s = "";
String fileextends = "";
string fileName = Myfileupload.filename;
if (FileName!= "")
{
Get file suffix
Fileextends = EC. Uploadobj.getfileextends (FileName);
if (! EC. Uploadobj.checkfileextends (Fileextends))
{
EC. Messageobject.showpre ("Upload file type is illegal");
}
Random rd = new Random ();
s = EC. Randomobject.daterndname (RD) + "." + fileextends;
string file = Fpath + "\" + S;
Try
{
Myfileupload.saveas (file);
}
catch (Exception ee)
{
throw new Exception (EE. ToString ());
}
}
return s;
}

#endregion

#region Add text watermark

<summary>
Add text watermark
</summary>
<param name= "FileName" > File name Path (full path) </param>
<param name= "text" > File </param>
public void Addtexttoimg (string fileName, string text)
{
if (! File.exists (FileName))
{
throw new FileNotFoundException ("file does not exist");
}
if (Text = = String. Empty)
{
Return
}
To determine whether a file type is an image type

System.Drawing.Image Image = System.Drawing.Image.FromFile (fileName);
Bitmap Bitmap = new Bitmap (image, image. Width, image. Height);
Graphics g = graphics.fromimage (bitmap);
float fontsize = 12.0f;//font Size
float textWidth = text. Length * fontsize;//of text
The following defines a rectangular area, which is then painted with a white background and a black word in the rectangle.
float rectx = 0;
float recty = 0;
float rectwidth = text. Length * (fontsize + 8);
Float Rectheight = fontsize + 8;
Declaring a rectangular field
RectangleF TextArea = new RectangleF (Rectx, Recty, Rectwidth, rectheight);
Font font = new Font ("XXFarEastFont-Arial", fontsize);//define Fonts
Brush Whitebrush = new SolidBrush (color.white)//White brush, drawing text
Brush Blackbrush = new SolidBrush (color.black)//Black brush, drawing background
G.fillrectangle (Blackbrush, Rectx, Recty, Rectwidth, rectheight);
g.DrawString (text, font, Whitebrush, TextArea);
MemoryStream ms = new MemoryStream ();
Bitmap. Save (MS, Imageformat.jpeg);
Output processing image, here for demonstration convenience, I will display the picture in the page
Response.Clear ();
Response.ContentType = "Image/jpeg";
Response.BinaryWrite (Ms. ToArray ());
G.dispose ();
Bitmap. Dispose ();
Image. Dispose ();
}
#endregion
}
}