DataViewViewModel.cs
Language: C#
Last Modified: 2020-06-27 1:58:36 PM UTC
File Size: 11222 bytes
Last Modified: 2020-06-27 1:58:36 PM UTC
File Size: 11222 bytes
http://www.penguinstew.ca/example/dataviewer/ViewModel/DataViewViewModel.cs
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.SqlClient;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Budgeter.Model;
using System.Windows.Data;
using System.Data.Linq;
using System.Data.Linq.Mapping;
using Penguin.MVVMBase.ViewModelBase;
using Penguin.MVVMBase.Util;
using Budgeter.Model.Connection;
namespace DataViewer.ViewModel
{
class DataViewViewModel : WindowViewModelBase
{
#region Constants
private const int DEFAULT_WIDTH = 150;
#endregion
#region Variables
/// <summary>
/// DataContext reference
/// </summary>
private BudgeterDataContext m_connection;
#endregion
#region Properties
private ObservableCollection<string> m_tableList;
/// <summary>
/// List of tables to view
/// </summary>
public ObservableCollection<string> TableList
{
get
{
return m_tableList;
}
set
{
SetProperty(ref m_tableList, value, "TableList");
}
}
private string m_selectedTable;
/// <summary>
/// The name of the currently selected table
/// </summary>
public string SelectedTable
{
get
{
return m_selectedTable;
}
set
{
if (SetProperty(ref m_selectedTable, value, "SelectedTable"))
{
UpdateList();
}
}
}
private IList m_dataList;
/// <summary>
/// List of items in the selected table
/// </summary>
public IList DataList
{
get
{
return m_dataList;
}
set
{
SetProperty(ref m_dataList, value, "DataList");
}
}
private GridView m_dataGridView;
/// <summary>
/// The view to use with the currently selected table
/// </summary>
public GridView DataGridView
{
get
{
return m_dataGridView;
}
set
{
SetProperty(ref m_dataGridView, value, "DataGridView");
}
}
private RelayCommand m_openCommand;
/// <summary>
/// Command for the open selector button
/// </summary>
public ICommand OpenCommand
{
get
{
return m_openCommand;
}
}
#endregion
#region Constructor
/// <summary>
/// Default constructor
/// </summary>
public DataViewViewModel()
{
//Setup command
m_openCommand = new RelayCommand(
_ =>
{
OpenServerSelector();
});
//Setup table
TableList = new ObservableCollection<string>();
Type dataContextType = typeof(BudgeterDataContext);
foreach (var field in dataContextType.GetFields())
{
TableList.Add(field.Name);
}
if (TableList.Count == 0)
{
throw new InvalidOperationException("There are no tables defined");
}
m_selectedTable = TableList.First();
}
#endregion
#region private methods
/// <summary>
/// Updates the list view based on the currently selected table
/// </summary>
private void UpdateList()
{
if (m_connection == null)
{
RequestMsgBox("Error: No database connection", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
IList list = new List<Object>();
GridView view = new GridView();
Type dataContextType = typeof(BudgeterDataContext);
var field = dataContextType.GetField(SelectedTable);
Type fieldType = field.FieldType;
if (field == null || !fieldType.IsGenericType)
{
return;
}
Type[] fieldArguments = fieldType.GetGenericArguments();
Type type = fieldArguments.FirstOrDefault();
if (type == null)
{
return;
}
foreach (var property in type.GetProperties())
{
if (property.Name.Contains("Colour"))
{
var textBlockFactory = new FrameworkElementFactory(typeof(TextBlock));
textBlockFactory.SetValue(TextBlock.TextProperty, new Binding(property.Name));
textBlockFactory.SetValue(TextBlock.ForegroundProperty, new Binding(property.Name));
DataTemplate cellTemplate = new DataTemplate()
{
VisualTree = textBlockFactory,
};
view.Columns.Add(new GridViewColumn()
{
Header = property.Name,
CellTemplate = cellTemplate
});
}
else if (property.PropertyType == typeof(Decimal))
{
view.Columns.Add(new GridViewColumn()
{
Header = property.Name,
DisplayMemberBinding = new Binding(property.Name)
{
StringFormat = "C"
},
});
}
else if (property.PropertyType.GetInterface(typeof(ICollection).FullName) != null)
{
view.Columns.Add(new GridViewColumn()
{
Header = property.Name,
DisplayMemberBinding = new Binding(property.Name + ".Count"),
});
}
else
{
view.Columns.Add(new GridViewColumn()
{
Header = property.Name,
DisplayMemberBinding = new Binding(property.Name),
});
}
}
ITable table = field.GetValue(m_connection) as ITable;
foreach (var item in table)
{
list.Add(item);
}
DataList = list;
DataGridView = view;
}
/// <summary>
/// Makes a view request to display the server selector
/// </summary>
private void OpenServerSelector()
{
RequestView(new ServerSelectorViewModel());
}
/// <summary>
/// Update the server connection and config settings
/// </summary>
/// <param name="selectorViewModel">The view model of the server selector</param>
/// <param name="result">The result from the view closing</param>
private void ServerSelectorClosed(ServerSelectorViewModel selectorViewModel, bool result)
{
if (!result)
{
return;
}
//Get the data from the view model
string serverName = selectorViewModel.SelectedServer;
string databaseName = "";
if (selectorViewModel.IsNewDatabase)
{
databaseName = selectorViewModel.NewDatabaseName;
}
else
{
databaseName = selectorViewModel.SelectedDatabase;
}
//Update connection
ConnectionStringManager manager = new ConnectionStringManager(serverName, databaseName);
BudgeterDataContext.Reinitialize(manager);
m_connection = BudgeterDataContext.Instance;
TestServer();
manager.SaveSettings();
UpdateList();
}
/// <summary>
/// Calls the server test message and displays a message box if there's a problem
/// </summary>
private void TestServer()
{
try
{
m_connection.TestServer();
}
catch (Exception ex)
{
if(!(ex is SqlException) && !(ex is InvalidCastException))
{
throw;
}
RequestMsgBox("Failed to retrieve data, this likely means the database schema is wrong. \n Do you want to recreate the database?",
"Failed schema test", MessageBoxButton.YesNo, MessageBoxImage.Error,
result => {
if (result == MessageBoxResult.Yes)
{
m_connection.ReCreateDatabase();
}
else
{
OpenServerSelector();
}
});
}
}
#endregion
#region Overrides
/// <summary>
/// Initialize database settings
/// </summary>
public override void ViewLoaded(object sender, RoutedEventArgs e)
{
ConnectionStringManager manager = new ConnectionStringManager();
//If config settings are blank then prompt to select server
if (!manager.IsInitalized())
{
OpenServerSelector();
}
else //Else load server settings from config
{
m_connection = BudgeterDataContext.Instance;
try
{
m_connection.TestServer();
}
catch (SqlException)
{
RequestMsgBox("There was a problem connecting to the database\n press OK to select a database.",
"Failed database connection", MessageBoxButton.OK, MessageBoxImage.Error,
result =>
{
OpenServerSelector();
});
}
}
}
/// <summary>
/// Call method containing logic for server selector closed
/// </summary>
public override void RequestedViewClosed(IWindowViewModel viewModel, bool result)
{
if (viewModel is ServerSelectorViewModel)
{
ServerSelectorClosed((ServerSelectorViewModel)viewModel, result);
}
}
#endregion
}
}
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