[英]selection in datagridview comboboxcolumn display image in another cell c# windows form
我已經使用 sql 數據庫中的圖像 ID 和圖像名稱加載了 combobox。 如果我們 select combobox 中的任何圖像名稱,我想要它,具有該圖像名稱的圖像將顯示在另一個單元格中。 下面的代碼是我如何使用數據庫中的數據加載我的 datagridview combobox 列。 這是數據庫中的表格,有人可以幫助我嗎? 這是datagridview中的列
`
string constr = @"Data Source=DESKTOP-909N2K6\SQLEXPRESS;Initial Catalog=project1;Integrated Security=True";
using (SqlConnection conn = new SqlConnection(constr))
{
using (SqlDataAdapter sda = new SqlDataAdapter("SELECT shapeID, shapeCode FROM shapeTable order by shapeCode asc ", conn))
{
//Fill the DataTable with records from Table.
DataTable dt = new DataTable();
sda.Fill(dt);
//Insert the Default Item to DataTable.
DataRow row = dt.NewRow();
dt.Rows.InsertAt(row, 0);
//Assign DataTable as DataSource, Shape is the comboboxcolumn name that i have add in the datagridview column.
this.Shape.DisplayMember = "shapeCode";
this.Shape.ValueMember = "shapeID";
this.Shape.DataSource = dt;
}
}
`
我已經嘗試使用此代碼,但我在要求組合框列選擇值時遇到問題,並且代碼不起作用。
編輯:我需要檢索 combobox 列值的方法,現在我不知道使用屬於 combobox 列值的圖像顯示圖像列的正確方法。
void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
if (dataGridView1.IsCurrentCellDirty)
{
// This fires the cell value changed handler below
dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
}
}
private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
DataGridViewComboBoxCell Shape = (DataGridViewComboBoxCell)dataGridView1.Rows[e.RowIndex].Cells[10];
if (Shape.Value != null)
{
// the code to display image based on the value retrieve from the combobox column
dataGridView1.Invalidate();
}
}
好的,我已經得到了答案。 這是ui的例子
void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
if (dataGridView1.IsCurrentCellDirty)
{
// This fires the cell value changed handler below
dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
}
}
private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
DataGridViewComboBoxCell Shape = (DataGridViewComboBoxCell)dataGridView1.Rows[e.RowIndex].Cells[10]; //retrieve the datagridview combobox column value
if (e.ColumnIndex == Shape.ColumnIndex) // this the code where i use to display the image in the datagridviewimage column
{
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
using (SqlCommand cmmd = new SqlCommand("SELECT shapeImage FROM shapeTable WHERE shapeCode = @shapeCode", conn))
{
try
{
cmmd.Parameters.AddWithValue("@shapeCode", Shape.Value);
conn.Open();
byte[] bytes = (byte[])cmmd.ExecuteScalar();
conn.Close();
Image img = byteArrayToImage(bytes);
DataGridViewRow row = dataGridView1.Rows[e.RowIndex];
row.Cells[11].Value = img;
}
catch (Exception ex)
{
MessageBox.Show("Error\n" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
dataGridView1.Invalidate();
}
}
}
public Image byteArrayToImage(byte[] byteArrayIn)
{
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
return returnImage;
}
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