/// <summary>
/// Execute a lambda
/// </summary>
private object ExecuteLambda(string action, object source, PropertyInfo property, string pathName, PatchOperation op)
{
var mi = typeof(QueryExpressionParser).GetGenericMethod("BuildLinqExpression", new Type[] { property.PropertyType.StripGeneric() }, new Type[] { typeof(NameValueCollection) });
// Does this have a selector?
var classAtt = source.GetType().StripGeneric().GetCustomAttribute <ClassifierAttribute>();
object lambda = null;
if (classAtt != null) // The value is complex
{
if (op.Value is IdentifiedData)
{
var classProp = op.GetType().GetRuntimeProperty(classAtt.ClassifierProperty);
var classAttValue = classProp.GetValue(op.Value);
lambda = mi.Invoke(null, new object[] { NameValueCollection.ParseQueryString($"{op.Path.Replace(pathName, "")}[{classAttValue}]") });
}
else
{
lambda = mi.Invoke(null, new object[] { NameValueCollection.ParseQueryString($"{op.Path.Replace(pathName, "")}={op.Value}") });
}
}
else
{
lambda = mi.Invoke(null, new object[] { NameValueCollection.ParseQueryString($"{op.Path.Replace(pathName, "")} = {op.Value}") });
}
lambda = lambda.GetType().GetRuntimeMethod("Compile", new Type[] { }).Invoke(lambda, new object[] { });
var filterMethod = typeof(Enumerable).GetGenericMethod(action, new Type[] { property.PropertyType.StripGeneric() }, new Type[] { typeof(IEnumerable <>).MakeGenericType(property.PropertyType.StripGeneric()), lambda.GetType() });
if (filterMethod == null)
{
throw new PatchException($"Cannot locate instance of {action}() method on collection type {source.GetType()} at {op}");
}
return(filterMethod.Invoke(null, new object[] { source, lambda }));
}
