我必须更新我的txtid, txtName, txtAge, txtContact..OnSelectionChange ListPicker，但即使在选择项目之后它也不会更新txtfields。我怎样才能加强它？
public partial class Update : PhoneApplicationPage
{
Button btnUpdate1 = null;
TextBox txtid = null;
TextBox txtName = null;
TextBox txtAge = null;
TextBox txtContact = null;
ListPicker lp = null;
int selectedItem ;
public Update()
{
InitializeComponent();
int x = noofrows();
createUpdateButton();
createListPicker();
selectedItem = Convert.ToInt32(lp.SelectedItem);
createTxtId(selectedItem);
createTxtName(selectedItem);
createTxtAge(selectedItem);
createTxtContact(selectedItem);
}
public void createListPicker()
{
lp = new ListPicker();
lp.BorderBrush = new SolidColorBrush(Colors.White);
lp.BorderThickness = new Thickness(3);
lp.Margin = new Thickness(12, 5, 0, 0);
lp.Width = 400;
int x = noofrows();
for (int a = 1; a <= x; a++)
{
string str1 = returnID(a);
lp.Items.Add(str1);
}
lp.SelectionChanged += (s, e) =>
{
selectedItem = Convert.ToInt32(lp.SelectedItem);
};
LayoutRoot.Children.Add(lp);
}
public void createUpdateButton()
{
btnUpdate1 = new Button();
btnUpdate1.Margin = new Thickness(100, 600, 0, 0);
btnUpdate1.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
btnUpdate1.VerticalAlignment = System.Windows.VerticalAlignment.Bottom;
btnUpdate1.Height = 100;
btnUpdate1.Width = 150;
btnUpdate1.Content = "update";
btnUpdate1.Foreground = new SolidColorBrush(Colors.White);
btnUpdate1.Background = new SolidColorBrush(Colors.Black);
btnUpdate1.BorderBrush = new SolidColorBrush(Colors.White);
btnUpdate1.BorderThickness = new Thickness(3);
btnUpdate1.FontSize = 28;
LayoutRoot.Children.Add(btnUpdate1);
btnUpdate1.Click += (s, e) =>
{
UpdateDatabase(selectedItem);
};
}
public void createTxtId(int z)
{
int id = z ;
txtid = new TextBox();
txtid.Margin = new Thickness(12, 100, 0, 0);
txtid.Width = 400;
txtid.Height = 100;
txtid.FontSize = 28;
txtid.Foreground = new SolidColorBrush(Colors.Black);
txtid.BorderBrush = new SolidColorBrush(Colors.Black);
txtid.VerticalAlignment = System.Windows.VerticalAlignment.Top;
txtid.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
txtid.BorderThickness = new Thickness(3);
txtid.IsReadOnly = true;
txtid.Text = " " + id;
LayoutRoot.Children.Add(txtid);
}
public void createTxtName(int z)
{
txtName = new TextBox();
txtName.Margin = new Thickness(12, 200, 0, 0);
txtName.Width = 400;
txtName.Height = 100;
txtName.FontSize = 28;
txtName.Foreground = new SolidColorBrush(Colors.Black);
txtName.BorderBrush = new SolidColorBrush(Colors.Black);
txtName.VerticalAlignment = System.Windows.VerticalAlignment.Top;
txtName.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
txtName.BorderThickness = new Thickness(3);
txtName.Text = SelectName(z);
txtName.Tap += (s, e) =>
{
if (txtName.Text == "Name")
{
txtName.Text = "";
}
};
txtName.LostFocus += (s, e) =>
{
if (txtName.Text == "")
{
txtName.Text = "Name";
}
};
LayoutRoot.Children.Add(txtName);
}
public void createTxtAge(int z)
{
txtAge = new TextBox();
txtAge.Margin = new Thickness(12, 300, 0, 0);
txtAge.Width = 400;
txtAge.Height = 100;
txtAge.FontSize = 28;
txtAge.Foreground = new SolidColorBrush(Colors.Black);
txtAge.BorderBrush = new SolidColorBrush(Colors.Black);
txtAge.VerticalAlignment = System.Windows.VerticalAlignment.Top;
txtAge.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
txtAge.BorderThickness = new Thickness(3);
txtAge.MaxLength = 2;
txtAge.Text = SelectAge(z);
txtAge.InputScope = new InputScope();
txtAge.InputScope.Names.Add(new InputScopeName() { NameValue = InputScopeNameValue.Number });
txtAge.Tap += (s, e) =>
{
if (txtAge.Text == "Age")
{
txtAge.Text = "";
}
};
txtAge.LostFocus += (s, e) =>
{
if (txtAge.Text == "")
{
txtAge.Text = "Age";
}
};
LayoutRoot.Children.Add(txtAge);
}
public void createTxtContact(int z)
{
txtContact = new TextBox();
txtContact.Margin = new Thickness(12, 400, 0, 0);
txtContact.Width = 400;
txtContact.Height = 100;
txtContact.FontSize = 28;
txtContact.MaxLength = 10;
txtContact.Foreground = new SolidColorBrush(Colors.Black);
txtContact.BorderBrush = new SolidColorBrush(Colors.Black);
txtContact.VerticalAlignment = System.Windows.VerticalAlignment.Top;
txtContact.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
txtContact.BorderThickness = new Thickness(3);
txtContact.Text = SelectContact(z);
txtContact.InputScope = new InputScope();
txtContact.InputScope.Names.Add(new InputScopeName() { NameValue = InputScopeNameValue.Number });
txtContact.Tap += (s, e) =>
{
if (txtContact.Text == "Contact")
{
txtContact.Text = "";
}
};
txtContact.LostFocus += (s, e) =>
{
if (txtContact.Text == "")
{
txtContact.Text = "Contact";
}
};
LayoutRoot.Children.Add(txtContact);
}
public Int32 noofrows()
{
int b = Convert.ToInt32((Application.Current as App).db.SelectList("select count(*) from details"));
return b;
}
public string returnID(int z)
{
return Convert.ToString((Application.Current as App).db.SelectList("select id from details where id =" + z));
}
public String SelectName(int x)
{
return Convert.ToString((Application.Current as App).db.SelectList("select name from details where id =" + x));
}
public String SelectAge(int x)
{
return Convert.ToString((Application.Current as App).db.SelectList("select age from details where id =" + x));
}
public String SelectContact(int x)
{
return Convert.ToString((Application.Current as App).db.SelectList("select contact from details where id =" + x));
}
public void UpdateDatabase(int ID)
{
if (txtName.Text=="Name")
{
MessageBox.Show("Enter a valid Name");
}
else if (txtAge.Text.Length>=3||txtAge.Text=="Age")
{
MessageBox.Show("Enter A valid Age (1-99)");
}
else if (txtContact.Text.Length != 10)
{
MessageBox.Show("Enter a valid Mobile number Of 10 digit");
}
else
{
string s1 = "update details set id='" + Convert.ToInt64(txtid.Text) + "', name = '" + txtName.Text + "', age = '" + txtAge.Text + "', contact = '" + txtContact.Text + "'where id = " + ID;
string s2 = Convert.ToString((Application.Current as App).db.SelectList(s1));
MessageBox.Show("Updated Successfully");
NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
}
}
}