i am displaying images into datagridview, is working fine without any problem, but when i wan to download a single image it keeps on showing me problems that i have to (Select a single cell from Attachment column). Please the code is detailed. one can try it and help out with a solution. thank you
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
namespace ImageThumbnailDataGridView
{
public partial class FormMain : Form
{
private List files = null;
private int numberPreviewImages = 100;
private int imageSize = 90;
private int currentStartImageIndex = 0;
private int currentEndImageIndex = 0;
//Dictionary will store the attachments
Dictionary myAttachments;
public FormMain()
{
InitializeComponent();
}
private void btnLoadImages_Click(object sender, EventArgs e)
{
if (openFileDialog.ShowDialog(this) != DialogResult.OK)
{
return;
}
files = new List();
files.AddRange(openFileDialog.FileNames);
files.Sort();
if (numberPreviewImages == 1)
{
currentStartImageIndex = 0;
currentEndImageIndex = 1;
}
else
{
currentEndImageIndex = currentStartImageIndex + numberPreviewImages - 1;
}
this.LoadImages();
}
private void LoadImages()
{
try
{
if (files == null)
{
return;
}
if (this.WindowState == FormWindowState.Minimized)
{
return;
}
dataViewImages.Rows.Clear();
dataViewImages.Columns.Clear();
int numColumnsForWidth = (dataViewImages.Width - 10) / (imageSize + 20);
int numRows = 0;
int numImagesRequired = 0;
if (currentEndImageIndex > files.Count)
{
// Are we requesting to display more images than we actually have? If so then reduce
if (currentStartImageIndex == 0)
{
numImagesRequired = files.Count;
}
else
{
numImagesRequired = (currentEndImageIndex - currentStartImageIndex) - (currentEndImageIndex - _files.Count);
}
}
else
{
// Calculated the number of rows we will need for normal use
numImagesRequired = currentEndImageIndex - currentStartImageIndex;
}
numRows = numImagesRequired / numColumnsForWidth;
if (numImagesRequired % numColumnsForWidth > 0)
{
numRows += 1;
}
if (numImagesRequired < numColumnsForWidth)
{
numColumnsForWidth = numImagesRequired;
}
int numGeneratedCells = numRows * numColumnsForWidth;
// Dynamically creating the columns
for (int index = 0; index < numColumnsForWidth; index++)
{
DataGridViewImageColumn dataGridViewColumn = new DataGridViewImageColumn();
dataViewImages.Columns.Add(dataGridViewColumn);
dataViewImages.Columns[index].Width = imageSize + 20;
}
// Creating the rows
for (int index = 0; index < numRows; index++)
{
dataViewImages.Rows.Add();
dataViewImages.Rows[index].Height = imageSize + 20;
}
int columnIndex = 0;
int rowIndex = 0;
for (int index = currentStartImageIndex; index < currentStartImageIndex + numImagesRequired; index++)
{
// Load the image from the file and add to the DataGridView
Image image = Helper.ResizeImage(files[index], imageSize, imageSize, false);
dataViewImages.Rows[rowIndex].Cells[columnIndex].Value = image;
dataViewImages.Rows[rowIndex].Cells[columnIndex].ToolTipText = Path.GetFileName(files[index]);
// Have we reached the end column? if so then start on the next row
if (columnIndex == numColumnsForWidth - 1)
{
rowIndex++;
columnIndex = 0;
}
else
{
columnIndex++;
}
}
// Blank the unused cells
if (numGeneratedCells > numImagesRequired)
{
for (int index = 0; index < numGeneratedCells - numImagesRequired; index++)
{
DataGridViewCellStyle dataGridViewCellStyle = new DataGridViewCellStyle();
dataGridViewCellStyle.NullValue = null;
dataGridViewCellStyle.Tag = "BLANK";
dataViewImages.Rows[rowIndex].Cells[columnIndex + index].Style = dataGridViewCellStyle;
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void dataViewImages_Resize(object sender, EventArgs e)
{
this.LoadImages();
}
private void FormMain_Load(object sender, EventArgs e)
{
imageSize = 90;
}
private void button1_Click(object sender, EventArgs e)
{
if (dataViewImages.SelectedRows.Count == 1 && dataViewImages.SelectedCells[0].ColumnIndex == 1 && dataViewImages.SelectedCells[0].Value != null)
{
DownloadAttachment(dataViewImages.SelectedCells[0]);
}
else
MessageBox.Show("Select a single cell from Attachment column", "Error uploading file", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
private void DownloadAttachment(DataGridViewCell dgvCell)
{
string fileName = Convert.ToString(dgvCell.Value);
//Return if the cell is empty
if (fileName == string.Empty)
return;
FileInfo fileInfo = new FileInfo(fileName);
string fileExtension = fileInfo.Extension;
byte[] byteData = null;
//show save as dialog
using (SaveFileDialog saveFileDialog1 = new SaveFileDialog())
{
//Set Save dialog properties
saveFileDialog1.Filter = "Files (*" + fileExtension + ")|*" + fileExtension;
saveFileDialog1.Title = "Save File as";
saveFileDialog1.CheckPathExists = true;
saveFileDialog1.FileName = fileName;
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
byteData = myAttachments[dgvCell.RowIndex];
File.WriteAllBytes(saveFileDialog1.FileName, byteData);
}
}
}
}
}
Amit GuptaPosted Mar 29, 2021, 3:50 AM