如何在我的表单上显示图像何时附加到我的表单 [英] how to show image in my form when to get attached to my form

问题描述

亲爱的所有人，
我有一个带有上传文件控件的表单，我正在其中上传图片，每个表单仅包含一张图片
我想在表格的右侧以400X400的尺寸显示图片.
谁能帮我解决问题.

在Advance中致谢

Dear All,
i had a form with upload file control i am uploading pics in it each form contains one pic only
i want to display the pic on right side of my form with 400X400 size.
can any one help me to resolve the issue.

Thanks in Advance

推荐答案

查看这些教程-

http://www.dotnetspark.com/kb/843- show-uploaded-image-image-image-control-asp-net.aspx
.NET图片上传
如何使用ASP.NET上传图像

Check these tutorials -

http://www.dotnetspark.com/kb/843-show-uploaded-image-image-control-asp-net.aspx
.NET Image Uploading
How to upload an image using ASP.NET

希望它会帮助您

hope this will help you

protected void btnupload_Click(object sender, EventArgs e)
    {
        // Initialize variables
        string sSavePath;
        string sThumbExtension;
        int intThumbWidth;
        int intThumbHeight;

        // Set constant values
        sSavePath = "images/";
        sThumbExtension = "_thumb";
        intThumbWidth = 160;
        intThumbHeight = 120;

        // If file field isn’t empty
        if (imgupload.PostedFile != null)
        {
            // Check file size (mustn’t be 0)
            HttpPostedFile myFile = imgupload.PostedFile;
            int nFileLen = myFile.ContentLength;
            if (nFileLen == 0)
            {
                lbloutput.Text = "There wasn't any file uploaded.";
                return;
            }

            // Check file extension (must be JPG)
            if (System.IO.Path.GetExtension(myFile.FileName).ToLower() != ".jpg")
            {
                lbloutput.Text = "The file must have an extension of JPG";
                return;
            }

            // Read file into a data stream
            byte[] myData = new Byte[nFileLen];
            myFile.InputStream.Read(myData, 0, nFileLen);

            // Make sure a duplicate file doesn’t exist.  If it does, keep on appending an incremental numeric until it is unique
            string sFilename = System.IO.Path.GetFileName(myFile.FileName);
            int file_append = 0;
            while (System.IO.File.Exists(Server.MapPath(sSavePath + sFilename)))
            {
                file_append++;
                sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) + file_append.ToString() + ".jpg";
            }

            // Save the stream to disk
            System.IO.FileStream newFile = new System.IO.FileStream(Server.MapPath(sSavePath + sFilename), System.IO.FileMode.Create);
            newFile.Write(myData, 0, myData.Length);
            newFile.Close();

            // Check whether the file is really a JPEG by opening it
            System.Drawing.Image.GetThumbnailImageAbort myCallBack = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
            Bitmap myBitmap;
            try
            {
                myBitmap = new Bitmap(Server.MapPath(sSavePath + sFilename));

                // If jpg file is a jpeg, create a thumbnail filename that is unique.
                file_append = 0;
                string sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) + sThumbExtension + ".jpg";
                while (System.IO.File.Exists(Server.MapPath(sSavePath + sThumbFile)))
                {
                    file_append++;
                    sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) + file_append.ToString() + sThumbExtension + ".jpg";
                }

                // Save thumbnail and output it onto the webpage
                System.Drawing.Image myThumbnail = myBitmap.GetThumbnailImage(intThumbWidth, intThumbHeight, myCallBack, IntPtr.Zero);
                myThumbnail.Save(Server.MapPath(sSavePath + sThumbFile));
                Image1.ImageUrl = sSavePath + sThumbFile;

                // Displaying success information
                lbloutput.Text = "File uploaded successfully!";

                // Destroy objects
                myThumbnail.Dispose();
                myBitmap.Dispose();
            }
            catch (ArgumentException errArgument)
            {
                // The file wasn't a valid jpg file
                lbloutput.Text = "The file wasn't a valid jpg file.";
                System.IO.File.Delete(Server.MapPath(sSavePath + sFilename));
            }
        }
    }
    public bool ThumbnailCallback()
    {
        return false;
    }

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