ExpressionBuilder | A library that provides a simple way to create lambda expressions to filter lists and database queri | Widget library

I'm learning generics and trying to write generic method in a project that I'm working on. I have a use case where I have a method which is recursive, which is exactly same but the parameters type are either Document or BasicDBObject. These parameters have nested list of objects so each of them again have objects of type Document or BasicDBObject inside them. So I have overloaded the methods with both the types. Can I use generics to change this method to accept any type?

I have a repository class as follows. Here my problem is in the GetSelected Method

I am using linq2db with the FluentMappingBuilder to map my database, and I want to know if I can map an custom column to my class.

This is my query.

When trying to filter dynamic dbset with generated expression

Strange problem, it fails if we create a fat-jar to execute the project but not from Netbeans. Any clue why?

It's simple apache-camel app, it starts a route using Mina to receive an HL7 and then uses a bean that directly answer the ACK message, a simple sample.

I have made a simple calculator in "Kotlin" using an android studio the problem I got and I don't have a way to fix it is how not to repeat the math operations after typing a number .. Perhaps because I am new to the world of Android application development and I do not know the way I should avoid this problem.

Example of what I mean, He entered addition/subtraction twice:

My codes : Main.kt

I have this custom SpannableStringBuilder class:

Let me preface this by saying, I am noob, and I know not what I do. So, if there is a better way of doing this, I am all ears.

Currently, I am working on project for which I need to be able to coerce a data source into a List, where T is an anonymous type, and filter it using lambda expressions, or create lambda expressions on the fly, save them to a database. I have already created a static wrapper class for System.Linq.Dynamic.Core, called RunTimeType, that has methods which allow me to create an anonymous type from some data source, and then create a List<> of that anonymous type. After both of the anontype and List are created, I am using an existing fluent interface to create an Expression>. Once I build the Expression and compile it, I either want to execute it, or I want to convert it to a string and save it to a database, xml file, etc., for later use.

Case 1:

When compiling and then immediately executing the expression, I am good up until this line:

var testList = anonList.Where(castedExp).ToList();

where i recieve the following error:

Error CS1973 C# has no applicable method named 'Where' but appears to have an extension method by that name. Extension methods cannot be dynamically dispatched. Consider casting the dynamic arguments or calling the extension method without the extension method syntax.

This makes sense, because filter is declared as a dynamic, which I am forced to do, otherwise compiler would complain with the following:

Error CS1061 'object' does not contain a definition for 'By' and no accessible extension method 'By' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

Case2:

As for the case of building the expression, converting it to a string, and then compiling to a valid Func, I am good up until this line:

var castedExp = (Func)compileExp;

where i recieve the following error:

Error System.InvalidCastException 'System.Func2[<>f__AnonymousType02[System.String,System.String],System.Boolean]' to type 'System.Func`2[System.Object,System.Boolean]'.'

However, I know that if I don't explicity cast to Func, the compiler will complain with the following:

Error CS1503 Argument 2: cannot convert from 'System.Delegate' to 'System.Func'.

So, my question is, how do I get around both of these situations, while still maintaining the ability use the anonymous type. Just to clarify again, I am forced to create an anonymous type because, I will not know what data set that I will be getting at run time, as these data sets are completely dynamic.

I want to reiterate, that I am open to doing this in a different way as long as the project's constraints are met. Frankly, I have been working on this for a while, I am out of ideas, and I need some guidance.

Below is all of the relevant code.

Test code: