/// <summary>
/// Returns an object that should be set on the property where this extension is applied.
/// </summary>
/// <param name="serviceProvider">Object that can provide services for the markup extension.</param>
/// <returns>The object value to set on the property where the markup extension provided
/// value is evaluated.</returns>
/// <exception cref="System.InvalidOperationException">serviceProvider was null, or failed to
/// implement a required service.</exception>
public override object ProvideValue(IServiceProvider serviceProvider)
{
object obj = null;
Type typeToResolve;
if (_dataContextType == null)
{
typeToResolve = typeof(object);
}
else if (_dataContextType is Type)
{
typeToResolve = (Type)_dataContextType;
}
else if (_dataContextType is String)
{
#if !WINDOWS_UWP
// ReSharper disable SuggestUseVarKeywordEvident
IXamlTypeResolver service = serviceProvider.GetService(typeof(IXamlTypeResolver)) as IXamlTypeResolver;
// ReSharper restore SuggestUseVarKeywordEvident
typeToResolve = BindHelper.ResolveTypeByName((string)_dataContextType);
if ((service != null) && (typeToResolve == null))
{
typeToResolve = service.Resolve((string)_dataContextType);
}
#else
typeToResolve = BindHelper.ResolveTypeByName((string)_dataContextType);
#endif
}
else
{
throw new ArgumentNullException("LocateDataContext - DataContextType can be 'Type' or 'String' or empty.");
}
// ReSharper disable SuggestUseVarKeywordEvident
IProvideValueTarget serviceProvideValueTarget = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
// ReSharper restore SuggestUseVarKeywordEvident
if ((serviceProvideValueTarget != null) && (serviceProvideValueTarget.TargetObject != null))
{
// Save targets for case delayed processing
TargetObject = serviceProvideValueTarget.TargetObject;
TargetProperty = serviceProvideValueTarget.TargetProperty;
if (!(serviceProvideValueTarget.TargetObject is DependencyObject))
{
throw new AggregateException("LocateDataContext - Target of the markup extension must be the DependencyObject type.");
}
obj = BindHelper.LocateValidDependencyPropertyByAllTrees(serviceProvideValueTarget.TargetObject as DependencyObject, FrameworkElement.DataContextProperty, MethodName, PropertyName, null, typeToResolve);
if (obj == null)
{
var frameworkElement = TargetObject as FrameworkElement;
if (frameworkElement != null)
{
frameworkElement.Loaded += DelayLocateDataContext;
}
}
}
return(obj);
}
/// <summary>
/// Returns an object that should be set on the property where this extension is applied.
/// </summary>
/// <param name="serviceProvider">Object that can provide services for the markup extension.</param>
/// <returns>The object value to set on the property where the markup extension provided
/// value is evaluated.</returns>
/// <exception cref="System.InvalidOperationException">serviceProvider was null, or failed to
/// implement a required service.</exception>
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (serviceProvider == null)
{
throw new ArgumentNullException("serviceProvider");
}
if (_serviceType == null)
{
// ReSharper disable NotResolvedInText
throw new ArgumentNullException("IocBinding - ServiceType cannot be null.");
// ReSharper restore NotResolvedInText
}
Type typeToResolve;
// ReSharper disable CanBeReplacedWithTryCastAndCheckForNull
if (_serviceType is Type)
// ReSharper restore CanBeReplacedWithTryCastAndCheckForNull
{
typeToResolve = (Type)_serviceType;
}
// ReSharper disable CanBeReplacedWithTryCastAndCheckForNull
else if (_serviceType is string)
// ReSharper restore CanBeReplacedWithTryCastAndCheckForNull
{
#if !WINDOWS_UWP
// ReSharper disable SuggestUseVarKeywordEvident
IXamlTypeResolver service = serviceProvider.GetService(typeof(IXamlTypeResolver)) as IXamlTypeResolver;
// ReSharper restore SuggestUseVarKeywordEvident
typeToResolve = BindHelper.ResolveTypeByName((string)_serviceType);
if ((service != null) && (typeToResolve == null))
{
typeToResolve = service.Resolve((string)_serviceType);
}
#else
typeToResolve = BindHelper.ResolveTypeByName((string)_serviceType);
#endif
if (typeToResolve == null)
{
throw new InvalidOperationException("IocBinding invalid cannot resolve type - " + (string)_serviceType);
}
}
else
{
// ReSharper disable NotResolvedInText
throw new ArgumentNullException("IocBinding - ServiceType can be 'Type' or 'String'.");
// ReSharper restore NotResolvedInText
}
if (AutoWireVmDataContext.ServiceProvider != null)
{
try { ResolvedResult = AutoWireVmDataContext.ServiceProvider.GetService(typeToResolve); } catch { }
if (ResolvedResult == null)
{
try { ResolvedResult = Activator.CreateInstance(typeToResolve); } catch { }
}
}
#if !WINDOWS_UWP
// ReSharper disable SuggestUseVarKeywordEvident
IProvideValueTarget valueTarget = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
// ReSharper restore SuggestUseVarKeywordEvident
//Attached collection support
if ((valueTarget != null) && (valueTarget.TargetObject != null) && (valueTarget.TargetObject is FakeCollection) && (valueTarget.TargetProperty == null))
{
return(this);
}
if ((valueTarget != null) && (valueTarget.TargetObject != null) && (valueTarget.TargetProperty == BindXAML.AssignPropertiesProperty))
{
throw new ArgumentException("IocBinding - Coding Error Direct access to attached property XAML Parser.");
}
//if ((valueTarget != null) && (valueTarget.TargetObject != null) && (valueTarget.TargetProperty != null) && (valueTarget.TargetProperty as MethodInfo != null))
//{
// // Support for a single attached property for WPF
// // XAML WinRt doesn't call ProvideValue() but WPF always does call ProvideValue()
// // In this case if use the single attached property we have to demonstrate
// return this; // That should be done like that
//}
#endif
if (!String.IsNullOrEmpty(PropertyName))
{
if (ResolvedResult != null)
{
var info = ResolvedResult.GetPropertyInfo(PropertyName);
if (info == null)
{
throw new ArgumentException("IocBinding - cannot resolve 'TargetPropertyName' property " + PropertyName);
}
ResolvedResult = info.GetValue(ResolvedResult, null);
}
}
return(ResolvedResult);
}
