Why it doesn't save changes into datatable from datagridview?

问题

I have binded datagridview with datatable (Growns). My main goal is, that user can work with datagridview (dataGridView1), filling and updating data and when button SAVE is clicked, all data would be saved into datatable, because I need it for further work.

Everything works fine, exept saving data into datatable. What am I doing wrong?

Here is my code:

private void Form2_Load(object sender, EventArgs e) {
        // TODO: This line of code loads data into the 'tekmovalecDataSet.Odrasli' table. You can move, or remove it, as needed.
        this.grownsTableAdapter.Fill(this.competitorDataSet.Odrasli);
    }

private void buttonSave_Click(object sender, EventArgs e) {
        if (EmptySpace())
        {
                CompetitorDataSet.OdrasliRow newGrownsRow = competitorDataSet.Growns.NewGrownsRow();
                newGrownsRow.StN = textStN.Text;
                newGrownsRow.Name = textN.Text;
                newGrownsRow.Surname = textSN.Text;
                newGrownsRow.Club = textC.Text;
                newGrownsRow.YBirth = textYB.Text;
                competitorDataSet.Growns.Rows.Add(OdrasliNova);
                competitorDataSet.Growns.AcceptChanges();

                this.dataGridView1.DataSource = competitorDataSet.Growns;
                this.Validate();
                this.grownsBindingSource.EndEdit();
                if (dataGridView1.BindingContext[competitorDataSet.Growns] != null)
                {
                    dataGridView1.BindingContext[competitorDataSet.Growns].EndCurrentEdit();
                }
                this.grownsTableAdapter.Update(competitorDataSet.Odrasli);
                this.grownsTableAdapter.Adapter.AcceptChangesDuringUpdate = true;
        }
        else
        {
            MessageBox.Show("Fill ALL data about competitor!");
        }
    }

P.S.: When I manually fill datatable, on form open datagridview is filled, so datatable and datagridview are connected I suppose...

P.S.2.: bool EmptySpace works fine.

回答1:

When you set this.Update(competitorDataSet.Odrasli); the TableAdapter updates the changes from DataTable (news, deleted, updated rows) to the database.

Since you call competitorDataSet.Growns.AcceptChanges(); before TableAdapter.Update, all changes in the table are already accepted and TableAdapter has nothing to update.

So just remove

competitorDataSet.Growns.AcceptChanges();

Also, if you set this.grownsTableAdapter.Adapter.AcceptChangesDuringUpdate = true before grownsTableAdapter.Update(competitorDataSet.Odrasli);, the changes will be accepted and so you don't need to accept changes yourself (and it seems to me that default value is True so I am not sure this line is required)

回答2:

You are not editing the data with the datagridview, you are changing the dataset using the textboxes, I think this is your example with the manual fill...

I will presume that the code you want to use to update the database begins at this line:

this.dataGridView1.DataSource = competitorDataSet.Growns;

I suspect your problem is in the following code block (explanations in code comments):

//why rebind the datagridview?
//this line should be removed
this.dataGridView1.DataSource = competitorDataSet.Growns;

//why call this here? validation should be done prior 
//to adding the new row to the datatable
//this line should be removed
this.Validate();

this.grownsBindingSource.EndEdit();
if (dataGridView1.BindingContext[competitorDataSet.Growns] != null)
{
dataGridView1.BindingContext[competitorDataSet.Growns].EndCurrentEdit();
}

//reverse the order of these 2 lines
this.grownsTableAdapter.Update(competitorDataSet.Odrasli);
this.grownsTableAdapter.Adapter.AcceptChangesDuringUpdate = true;
/* like this:
this.grownsTableAdapter.Adapter.AcceptChangesDuringUpdate = true;
this.grownsTableAdapter.Update(competitorDataSet.Odrasli);
 */

If this does not solve your problem, please post the binding code for your datagriview.

来源：https://stackoverflow.com/questions/17807373/why-it-doesnt-save-changes-into-datatable-from-datagridview