Expression Tree Tutorial - Knowledge Base (KB)

Difference in Expression.Subtract for DateTime between .NET Core and .NET Framework

While converting my ....NET 4.5... library to ....NETStandard v1.6... I ran into a failing unit test which used to pass before....I pinpointed the problem to the following three lines of code:...ParameterExpression arg1 = Expression.Parameter( typeof( Dat...

Auto Column Mapping Using Reflection and expression

is that possible to automate these mappings with reflection?...i have a simple column mapping :...var columnsMap = new Dictionary<string, Expression<Func<Industry, object>>> { ["id"] = v => v.Id, ["name"] = v => v.Name, ["isActive"] = v => v.I...

Correct Collection in ConstantExpression for EF Core

I try to realize my own Expression serializator/deserializator for passing it through services (I want to realize my own endpoint for EF Core service). So, now I have problem with Collections in LambdaExpressions. For example,...var dataQuery = testDb.Use...

Entity Framework Core LINQ Tree Expression Problem with Concat

So I have a IQueryable extension that does a little more than this block of code. Essentially I'm combining of bunch of strings and afterwards doing a Contains on them. The problem I'm running into is that Entity Framework Core doesn't support System.Stri...