Reload data using TableAdapter

问题:

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

How can I reload the data if changes were made in another form? (preferably automatically without using a Refresh button)?

I am using WinForms and the backend is Access 2007.

The data is bound using the Designer to a Datagrid

回答1:

First, I would move the Fill to a separate function:

public void LoadData()
{
   this.usersTableAdapter.Fill(this.workOrdersDataSet.users);
}

Then when you do your Load Event, you will call the function:

private void UserList_Load(object sender, EventArgs e)
{
   LoadData();
}

If you have another form that performs changes on the data, you can call this function in another event, similar to this. I use DialogResult in my code:

private void OpenOtherForm()
{
    DialogResult openForm = new OtherForm().ShowDialog();
    if(openForm == DialogResult.OK)
        LoadData();
}

In your code for the other Form after your update process is complete, include a line of code to tell your main form to update:

private void PerformUpdate()
{
    try
    {
        // your update code goes here
        DialogResult = DialogResult.OK; // this is the line that tells your other form to refresh
    }
    catch (Exception ex)
    {
        DialogResult = DialogResult.Abort;
    }
}

using the DialogResult then, tells your main form to trigger the Refresh of the Data only when an Update actually takes place.

回答2:

You can add this line into another function, say

public void MoveDataToUI()
{
   this.usersTableAdapter.Fill(this.workOrdersDataSet.users);
}

and after call this function from the even handler, which is raised when someone changes something in another form.

Events tutorial