How to implement method with expression parameter c#

Question

I want to create a method like this:

var result = database.Search(x=>x.Name, \"Entity Name field value\");
result = database.Search

        

Answer 1

do you want types to dynamic

public ReturnType Read(string FieldName, object dfVal)
{
    if (Res.IsDBNull(Res.GetOrdinal(FieldName)))
        return dfVal;
    try {
        return (ReturnType)Res.GetValue(Res.GetOrdinal(FieldName));
    } catch (Exception ex) {
        return dfVal;
    }
}