I have most of the textblock and radio button objects in my app bound to my dictionnary
I store the new value in a Dictionary.
The problem is that the binding failure is throwing an exception that is very slow.
Here is an example: (this code runs correctly, it is just slow if it can't find a match in the start app.)
<StackPanel>
<TextBox Text="{Binding Dictio[0], Mode=TwoWay}"/>
<TextBox Text="{Binding Dictio[1], Mode=TwoWay}"/>
<RadioButton GroupName="select" IsChecked="{Binding Dictio[2], Mode=TwoWay}" Content="true"/>
</stackPanel>
And in my class
private Dictionary<int, object> _Dictio;
public MainWindow()
{
Dictio = new Dictionary<int, object>();
this.DataContext = this;
InitializeComponent();
}
public Dictionary<int, object> Dictio
{
get { return _Dictio; }
set { _Dictio = value; }
}
private void test(object sender, RoutedEventArgs e)
{
foreach (KeyValuePair<int, object> kvp in Dictio)
{
Console.Out.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
}
}
When I try to start app and the binding tries to lookup Dictio[key], I get this in my output window for all the key of my dictionnary Dictio:
System.Windows.Data Error: 17 : Cannot get 'Item[]' value (type 'Object') from 'Dictio' (type 'Dictionary`2'). BindingExpression:Path=Dictio[4]; DataItem='MainWindow' (Name=''); target element is 'RadioButton' (Name='mm'); target property is 'IsChecked' (type 'Nullable`1') TargetInvocationException:'System.Reflection.TargetInvocationException: Une exception a été levée par la cible d'un appel. ---> System.Collections.Generic.KeyNotFoundException: La clé donnée était absente du dictionnaire.
System.Collections.Generic.Dictionary`2.get_Item(TKey key)
--- Fin de la trace de la pile d'exception interne ---
System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
System.Reflection.RuntimePropertyInfo.GetValue(Object obj, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
MS.Internal.Data.PropertyPathWorker.GetValue(Object item, Int32 level)
MS.Internal.Data.PropertyPathWorker.RawValue(Int32 k)'
Is there a way to make the connection not throw an exception if the dictionary is empty?
Pravesh Singh
11-Apr-2014I use your class CustomDictionary
This is my xaml file
when i execute i have this error
Une exception de première chance de type 'System.Collections.Generic.KeyNotFoundException' s'est produite dans mscorlib.dll
in your class CustomDictionnary in
return properties[index].Item1.GetValue(properties[index].Item2);