void Handle_ItemTapped(object sender, ItemTappedEventArgs e)
{
TypeProblem _currentTag = e.Item as TypeProblem;
((ListView)sender).SelectedItem = null;
Navigation.PushAsync(new DescribeProblemPage(_currentTag));
}
void Handle_PickProblem(object sender, SelectionChangedEventArgs e)
{
TypeProblem tmp = e.CurrentSelection.FirstOrDefault() as TypeProblem;
if (cv1.SelectedItem != null || cv2.SelectedItem != null || cv3.SelectedItem != null || cv4.SelectedItem != null || cv5.SelectedItem != null)
{
Navigation.PushAsync(new DescribeProblemPage(tmp));
}
}
public DescribeProblemPage(TypeProblem tmp)
{
_typeproblem = tmp;
TagID = tmp.TagID;
TitleText = tmp.Pcategory;
InitializeComponent();
IsLoading = false;
BindingContext = this;
}
private static void CacheTypes()
{
var baseType = typeof(Instance);
var asm = baseType.Assembly;
foreach (var type in asm.GetTypes().Where(x => baseType.IsAssignableFrom(x) && !x.IsAbstract))
{
TypeProblem problem = TypeProblem.NoProblem;
Func <Instance> creator = null;
if (type.IsAbstract)
{
problem = TypeProblem.NotCreatable;
}
else if (typeof(Service).IsAssignableFrom(type))
{
problem = TypeProblem.IsAService;
}
else if (type.GetConstructor(Type.EmptyTypes) == null)
{
problem = TypeProblem.RequiresParameters;
}
else if (type.GetCustomAttributes(typeof(UncreatableAttribute), false).Any())
{
problem = TypeProblem.NotCreatable;
}
if (problem == TypeProblem.NoProblem)
{
var constructor = type.GetConstructor(Type.EmptyTypes);
Debug.Assert(constructor != null, "constructor != null");
creator =
Expression.Lambda <Func <Instance> >(Expression.New(constructor))
.Compile();
}
var item = new TypeCacheItem(type, creator)
{
Problem = problem
};
_typeCache.TryAdd(type.Name, item);
}
}
internal IList <TypeProblem> GetzhTagList()
{
//建立数据库连接
MySqlConnection conn = new MySqlConnection(connStr);
try
{ //建立连接，打开数据库
conn.Open();
string sqlstr =
"SELECT * FROM Tags";
MySqlCommand cmd = new MySqlCommand(sqlstr, conn);
MySqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
int TagID = reader.GetInt32(0);
string Pcategory = reader.GetString(3);
string ImageUrl = reader.GetString(2);
TypeProblem tmp = new TypeProblem()
{
TagID = TagID,
Pcategory = Pcategory,
ImageUrl = ImageUrl
};
tagInfoList.Add(tmp);
}
return(tagInfoList);
}
catch (MySqlException ex)
{
Console.WriteLine(ex.ToString());
return(tagInfoList);
}
finally
{
conn.Close(); //关闭连接
}
}
public DescribeProblemPage(TypeProblem tmp)
{
_typeproblem = tmp;
InitializeComponent();
}
