如何使用 Datagridview 绑定源 C# 更新 SQL Server 数据库

Question

I'm writing a Winforms app in C# that enables the user to edit and update database using the datagridview.

The problem is, I can't make it to work. The only thing that I managed to achieve is updating what the datagridview is showing, but when I go into the database table, there is no change in the data. I have search a lot of sites discussing about that problem but nothing yet worked for me.

Things I have tried so far:

• binding the database to the datagridview
• changing the Copy to Output Directory property to Copy if newer
• using the dataAdapter.Update((DataTable)bindingSource1.DataSource) with or without any update query execute.
• execute update query without dataAdapter.update(...) .

Here is my code:

public Form1()
{
    InitializeComponent();
    GetData("SELECT * FROM Table1");
}

void GetData(string selectCommand)
{
    SqlConnection conn = new SqlConnection(Properties.Settings.Default.NewDBTESTConnectionString);

    dataAdapter = new SqlDataAdapter(selectCommand, conn);
    commandBuilder = new SqlCommandBuilder(dataAdapter);

    table = new DataTable();
    dataAdapter.Fill(table);

    bindingSource1.DataSource = table;
    dataGridView1.DataSource = bindingSource1;
}

private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
        dataAdapter.Update((DataTable)bindingSource1.DataSource);    
}

Answer 1

Without calling bindingSource1.EndEdit your underlying DataTable doesn't see any change and thus the Update command has nothing to update.

private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
    bindingSource1.EndEdit();
    DataTable dt = (DataTable)bindingSource1.DataSource;

    // Just for test.... Try this with or without the EndEdit....
    DataTable changedTable = dt.GetChanges();
    Console.WriteLine(changedTable.Rows.Count);

    int rowsUpdated = da.Update(dt);    
    Console.WriteLine(rowsUpdated);
}

Answer 2

You can have a save or update button to execute the code like this:

bindingSource1.EndEdit();
DataTable dt = (DataTable)bindingSource1.DataSource;   
dataAdaper.Update(dt);    

You will save all changes you made, but if you sort datagridview columns first then change data then run the save code above you will miss one record, the top first one before you sort. To fix it, you have to sort it back then save them. The best way to do it if you know which column to sort, you need to sort it when you load data to datagridview.

Jia Zhuang

Answer 3

You need to recreate the entire SqlDataAdapter in the CellEndEdit event.

    private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
    {
        SqlConnection conn = new SqlConnection(connectionString);
        var dataAdapter = new SqlDataAdapter("select * from [table]", conn);
        var commandBuilder = new SqlCommandBuilder(dataAdapter);
        dataAdapter.UpdateCommand = new SqlCommandBuilder(dataAdapter).GetUpdateCommand();            
        bindingSource1.EndEdit();
        dataAdapter.Update((DataTable)bindingSource1.DataSource);
    }