如何解决在datagridview中选择comboboxcolumn在另一个单元格中显示图像c#windows窗体
我已经使用 sql 数据库中的图像 ID 和图像名称加载了我的组合框。如果我们在组合框中选择任何图像名称,我想要它,具有该图像名称的图像将显示在另一个单元格中。下面的代码是我如何使用数据库中的数据加载我的 datagridview 组合框列。here is the table from the database 谁能帮助我? here is the columns in the datagridview
`
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;
}
}
`
我已经尝试使用此代码,但我在要求组合框列选择值时遇到问题,并且代码不起作用。
编辑:我需要检索组合框列值的方法,现在我不知道用属于组合框列值的图像显示图像列的正确方法。
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();
}
}
解决方法
好的,我已经得到了答案。 here are the example of ui
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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