从我的DataGridView获取值以在另一窗体上显示-C＃

Question

Basically, when I click on the cell, I want to be able to get everything on that row to show up in another form.

I have this code on my Show Form:

 public partial class showTask : Form
{
    public string TaskID, TaskName, TaskDescription, TaskTimeAndDateCompletion;
    public int TaskPriority;

    public showTask()
    {
        InitializeComponent();
    }

    public void ShowTaskChosen()
    {
        showTaskIDRtb.Text = TaskID;
        showTaskNameRtb.Text = TaskName;
        showTaskDescRtb.Text = TaskDescription;
        showTaskPriorityRtb.Text = Convert.ToString(TaskPriority);
        showTaskTimeAndCompletionDate.Text = TaskTimeAndDateCompletion;
    }

}

And on my DataGridView named tasksViewerDGV in my mainPage Form, I have this to try and get the values to show on another form:

private void tasksViewerDGV_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        int column = e.ColumnIndex;
        int row = e.RowIndex;

        DataGridView ShowTask = sender as DataGridView;
        if (ShowTask == null)
            return; //If the cell is null, then just return without sending any information

        var cell = ShowTask[column, row];

        if (cell != null)
        {
            DataGridViewRow rows = cell.OwningRow; //Which ever cell is clicked, it gets the row of that cell
            showTask displayTask = new showTask();

            displayTask.TaskID = rows.Cells["taskID"].Value.ToString();
            displayTask.TaskName = rows.Cells["taskName"].Value.ToString();
            displayTask.TaskDescription = rows.Cells["taskDescription"].Value.ToString();
            displayTask.TaskPriority = Convert.ToInt32(rows.Cells["taskPriority"].Value.ToString());
            displayTask.TaskTimeAndDateCompletion = rows.Cells["taskTimeAndDateCompletion"].Value.ToString();


            displayTask.ShowDialog();
            displayTask.ShowTaskChosen();
        }
    }

The problems are these: var cell = ShowTask[column, row]; as I get the IndexOutOfRange Exception. Furthermore, when debugging it say's -1 on 'row' variable. Finally, it takes me ages to trigger the event, sometimes I ave to press on the cell title multiple times for it to work. I have no clue what is going on, any light that could come my way would be greatly appreciated.

Kind Regards,

Kieran

Answer 1

Try this..

 private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex != -1)
    {
        string value =  dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString(); 
    }

}

Answer 2

CellContentClick event docs says:

This event occurs when the cell content is clicked

But cell content means just exactly the content of the cell and not some empty space in the cell. In that case you don't get the event fired.

In your context I would use CellMouseClick .

However this event is raised also in case you click the row or column headers of the grid. And for these cases the row or column index is -1.

You should have some kind of protection around these invalid values for row and column before trying to use them to find your grid cell.

private void dgv_CellClickMouse(object sender, 
                                DataGridViewCellMouseEventArgs e)
{
    DataGridView dgv = sender as DataGridView;
    int column = e.ColumnIndex;
    int row = e.RowIndex;

    if(column == -1 || row == -1)
    {
        // for debug purpose...
        Console.WriteLine("Not a valid row/column");
        return;
    }

    DataGridViewCell cell = dgv[column, row];

    if (cell != null)
    {

       ...... 
    }
}