/// <summary>Gets a delegate that can be invoked to add an item to a collection of the specified type.</summary>
/// <param name='listType'>Type of list to use.</param>
/// <returns>The delegate to invoke.</returns>
internal static Action <object, object> GetAddToCollectionDelegate(Type listType)
{
Debug.Assert(listType != null, "listType != null");
Type listElementType;
MethodInfo addMethod = ClientTypeUtil.GetAddToCollectionMethod(listType, out listElementType);
ParameterExpression list = Expression.Parameter(typeof(object), "list");
ParameterExpression item = Expression.Parameter(typeof(object), "element");
Expression body = Expression.Call(Expression.Convert(list, listType), addMethod, Expression.Convert(item, listElementType));
LambdaExpression lambda = Expression.Lambda(body, list, item);
return((Action <object, object>)lambda.Compile());
}
/// <summary>
/// constructor
/// </summary>
/// <param name="edmProperty">Back reference to the EdmProperty this annotation is part of.</param>
/// <param name="propertyInfo">propertyInfo instance.</param>
/// <param name="model">The client model.</param>
internal ClientPropertyAnnotation(IEdmProperty edmProperty, PropertyInfo propertyInfo, ClientEdmModel model)
{
Debug.Assert(edmProperty != null, "edmProperty != null");
Debug.Assert(propertyInfo != null, "null propertyInfo");
// Property should always have DeclaringType
Debug.Assert(propertyInfo.DeclaringType != null, "Property without a declaring type");
this.EdmProperty = edmProperty;
this.PropertyName = ClientTypeUtil.GetServerDefinedName(propertyInfo);
this.NullablePropertyType = propertyInfo.PropertyType;
this.PropertyType = Nullable.GetUnderlyingType(this.NullablePropertyType) ?? this.NullablePropertyType;
this.DeclaringClrType = propertyInfo.DeclaringType;
MethodInfo propertyGetMethod = propertyInfo.GetGetMethod();
MethodInfo propertySetMethod = propertyInfo.GetSetMethod();
ParameterExpression instance = Expression.Parameter(typeof(Object), "instance");
ParameterExpression value = Expression.Parameter(typeof(Object), "value");
// instance => (Object)(((T)instance).get_PropertyName()); <-- we need to box the value back to object to return
this.propertyGetter = propertyGetMethod == null ? null : (Func <object, object>)Expression.Lambda(
Expression.Convert(
Expression.Call(
Expression.Convert(instance, this.DeclaringClrType),
propertyGetMethod),
typeof(Object)),
instance).Compile();
// (instance, value) => ((T)instance).set_PropertyName((T1)value);
this.propertySetter = propertySetMethod == null ? null : (Action <object, object>)Expression.Lambda(
Expression.Call(
Expression.Convert(instance, this.DeclaringClrType),
propertySetMethod,
Expression.Convert(value, this.NullablePropertyType)),
instance,
value).Compile();
this.Model = model;
this.IsKnownType = PrimitiveType.IsKnownType(this.PropertyType);
// non primitive types: dictionary/collections
if (!this.IsKnownType)
{
var setMethodInfo = ClientTypeUtil.GetMethodForGenericType(this.PropertyType, typeof(IDictionary <,>), "set_Item", out this.DictionaryValueType);
if (setMethodInfo != null)
{
ParameterExpression propertyNameParam = Expression.Parameter(typeof(String), "propertyName");
// (instance, propertyName, value) => ((IDictionary<string, DictionaryValueType>)instance)[propertyName] = (DictionaryValueType)value;
this.dictionarySetter = (Action <Object, String, Object>)Expression.Lambda(
Expression.Call(
Expression.Convert(instance, typeof(IDictionary <,>).MakeGenericType(typeof(String), this.DictionaryValueType)),
setMethodInfo,
propertyNameParam,
Expression.Convert(value, this.DictionaryValueType)),
instance,
propertyNameParam,
value).Compile();
}
else
{
var containsMethod = ClientTypeUtil.GetMethodForGenericType(this.PropertyType, typeof(ICollection <>), "Contains", out this.collectionGenericType);
var addMethod = ClientTypeUtil.GetAddToCollectionMethod(this.PropertyType, out this.collectionGenericType);
var removeMethod = ClientTypeUtil.GetMethodForGenericType(this.PropertyType, typeof(ICollection <>), "Remove", out this.collectionGenericType);
var clearMethod = ClientTypeUtil.GetMethodForGenericType(this.PropertyType, typeof(ICollection <>), "Clear", out this.collectionGenericType);
// (instance, value) => ((PropertyType)instance).Contains((CollectionType)value); returns boolean
this.collectionContains = containsMethod == null ? null : (Func <Object, Object, Boolean>)Expression.Lambda(
Expression.Call(
Expression.Convert(instance, this.PropertyType),
containsMethod,
Expression.Convert(value, this.collectionGenericType)),
instance,
value).Compile();
// (instance, value) => ((PropertyType)instance).Add((CollectionType)value);
this.collectionAdd = addMethod == null ? null : (Action <Object, Object>)Expression.Lambda(
Expression.Call(
Expression.Convert(instance, this.PropertyType),
addMethod,
Expression.Convert(value, this.collectionGenericType)),
instance,
value).Compile();
// (instance, value) => ((PropertyType)instance).Remove((CollectionType)value); returns boolean
this.collectionRemove = removeMethod == null ? null : (Func <Object, Object, Boolean>)Expression.Lambda(
Expression.Call(
Expression.Convert(instance, this.PropertyType),
removeMethod,
Expression.Convert(value, this.collectionGenericType)),
instance,
value).Compile();
// (instance) => ((PropertyType)instance).Clear();
this.collectionClear = clearMethod == null ? null : (Action <Object>)Expression.Lambda(
Expression.Call(
Expression.Convert(instance, this.PropertyType),
clearMethod),
instance).Compile();
}
}
Debug.Assert(this.collectionGenericType == null || this.DictionaryValueType == null, "collectionGenericType and DictionaryItemType mutually exclusive. (They both can be null though).");
}