Question

I am using asp.net fileupload control for uploading image but here i want to automatically re size to 250*200px. please suggest me what to add in my code. I am a novice to asp.net.

protected void Button1_Click(object sender, EventArgs e)
        {   string s =@"~img"+FileUpload1.FileName;
            FileUpload1.PostedFile.SaveAs(Server.MapPath(s));


          }

Answer 1

i) 还认为该守则有助于重新制定

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.IO;
using System.Data.SqlClient;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Drawing;

public partial class ImageUpload : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnUpload_Click(object sender, EventArgs e)
    {

        string ImageName = txtName.Text;
        if (FileUpLoad1.PostedFile != null && FileUpLoad1.PostedFile.FileName != null)
        {

            string strExtension = System.IO.Path.GetExtension(FileUpLoad1.FileName);
            if ((strExtension.ToUpper() == ".JPG") | (strExtension.ToUpper() == ".GIF"))
            {
                // Resize Image Before Uploading to DataBase
                FileUpload fi = new FileUpload();
                fi = FileUpLoad1;

                System.Drawing.Image imageToBeResized = System.Drawing.Image.FromStream( fi.PostedFile.InputStream);
                int imageHeight = imageToBeResized.Height;
                int imageWidth = imageToBeResized.Width;
                int maxHeight = 120;
                int maxWidth = 160;
                imageHeight = (imageHeight * maxWidth) / imageWidth;
                imageWidth = maxWidth;

                if (imageHeight > maxHeight)
                {
                    imageWidth = (imageWidth * maxHeight) / imageHeight;
                    imageHeight = maxHeight;
                }

                Bitmap bitmap = new Bitmap(imageToBeResized, imageWidth, imageHeight);
                System.IO.MemoryStream stream = new MemoryStream();
                bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
                stream.Position = 0;
                byte[] image = new byte[stream.Length + 1];
                stream.Read(image, 0, image.Length);

                // Create SQL Connection 
                SqlConnection con = new SqlConnection();
                con.ConnectionString = ConfigurationManager.ConnectionStrings["Return_AuthorizationsConnectionString"].ConnectionString;

                 SqlCommand cmd = new SqlCommand();
                cmd.CommandText = "INSERT INTO Images(ImageName,Image) VALUES (@ImageName,@Image)";
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;

                SqlParameter ImageName1 = new SqlParameter("@ImageName", SqlDbType.VarChar, 50);
                ImageName1.Value = ImageName.ToString();
                cmd.Parameters.Add(ImageName1);

                SqlParameter UploadedImage = new SqlParameter("@Image", SqlDbType.Image, image.Length);
                UploadedImage.Value = image;
                cmd.Parameters.Add(UploadedImage);
                con.Open();
                int result = cmd.ExecuteNonQuery();
                con.Close();
                if (result > 0)
                    lblMessage.Text = "File Uploaded";
               GridView1.DataBind();
            }

            }

        }
}

Answer 2

在您在服务器上获得图像后,你可以将其除去,并删除原。

a 样本代码仅用于改装

and here is a full project with source code to manipulate images, including resize.

友情链接