private void listAuthorButton_Click(object sender, System.EventArgs e)
{
//clear the data grid
dataGrid1.DataSource = null;
//Call the service layer and
//ask it to fetch all authors
IList authors = AuthorServices.FetchAllAuthors(context);
//bind the result to the data grid
dataGrid1.DataSource = authors;
}
private void createAuthorButton_Click(object sender, System.EventArgs e)
{
//Call the service layer and
//ask it to create a new author object
Author author = AuthorServices.CreateAuthor(
context,
firstNameTextBox.Text,
lastNameTextBox.Text);
//Display the id of the new author
idTextBox.Text = author.Id.ToString();
}
private void deleteAuthorButton_Click(object sender, System.EventArgs e)
{
//Make sure the user has entered an author id
if (idTextBox.Text == "")
{
MessageBox.Show("Please enter the id of the author first!");
return;
}
//Call the service layer and
//ask it to delete the author
AuthorServices.DeleteAuthor(
context,
int.Parse(idTextBox.Text));
}
private void filterButton_Click(object sender, System.EventArgs e)
{
//clear the data grid
dataGrid1.DataSource = null;
//Call the service layer and
//ask it to fetch all authors
//matching the filter
IList authors = AuthorServices.FilterAuthors(
context,
firstNameFilterTextBox.Text,
lastNameFilterTextBox.Text);
//bind the result to the data grid
dataGrid1.DataSource = authors;
}
private void fetchAuthorButton_Click(object sender, System.EventArgs e)
{
//Make sure the user has entered an author id
if (idTextBox.Text == "")
{
MessageBox.Show("Please enter the id of the author first!");
return;
}
//Call the service layer and
//ask it to fetch an author by id
Author author = AuthorServices.FetchAuthorById(
context,
int.Parse(idTextBox.Text));
//Display the author's name
firstNameTextBox.Text = author.FirstName;
lastNameTextBox.Text = author.LastName;
}
private void removeAuthorButton_Click(object sender, System.EventArgs e)
{
//Make sure the user has entered an author id
if (idTextBox.Text == "")
{
MessageBox.Show("Please enter the id of the author first!");
return;
}
//Make sure the user has entered a book id
if (bookIdTextBox.Text == "")
{
MessageBox.Show("Please enter the id of the book first!");
return;
}
//Call the service layer and
//ask it to remove the author from the book
AuthorServices.RemoveAuthorFromBook(
context,
int.Parse(bookIdTextBox.Text),
int.Parse(idTextBox.Text));
}
