c# - Why Reflection List<T> is not generic? -


i can't understand why fieldtype not qualified generic list. tried use solution proposed below generic type of list. when reach fieldtype.isgenerictype == false, quite surprised , don't understand happening.

my goal able use method createtable() each field in context. context should have list fields.

this information found in object:

fieldtype = {name = "list`1" fullname =  "system.collections.generic.list`1[[webapplication1.models.movie, webapplication1, version=1.0.0.0, culture=neutral, publickeytoken=null]]"}

reference : c# generic list <t> how type of t?

my code example:

public class mediacontext {     public list<movie> movies { get; set; }     public list<subtitle> subtitles { get; set; }      public mediacontext()     {         this.movies = new list<movie>();         this.subtitles = new list<subtitle>();     } }   public void createdb(object context) {     type type = context.gettype();     fieldinfo[] fields = type.getfields(bindingflags.instance          | bindingflags.nonpublic);      foreach (fieldinfo field in fields)     {         type generictype = this.getgenerictype(field);          methodinfo method = this.gettype().getmethod("createtable");         methodinfo generic = method.makegenericmethod(generictype);         generic.invoke(this, null);     }      foreach (fieldinfo field in fields)     {         type generictype = this.getgenerictype(field);          methodinfo method = this.gettype().getmethod("addkeys");         methodinfo generic = method.makegenericmethod(generictype);         generic.invoke(this, null);     } }  private type getgenerictype(fieldinfo field) {     type fieldtype = field.gettype();     type generictype = null;     // believe should generic.     if (fieldtype.isgenerictype &&          fieldtype.getgenerictypedefinition() == typeof(list<>))     {         generictype = fieldtype.getgenericarguments()[0];     }     else     {         throw new exception("an array needed");     }      return generictype; }  public void createtable<t>() {     stringbuilder query = new stringbuilder();     type type = typeof(t);      query.append(string.format("create table {0} (", naminggeneration.plurializename(type.name)));      query.append(this.addfields(typeof(t).getproperties()));      query.append(")");      sqlcommand command = new sqlcommand();      command.commandtext = query.tostring();      sqlexecuterequest.instance.executenonquery(command); }  private void addkeys<t>() {     type type = typeof(t);     propertyinfo[] properties = type.getproperties();      ienumerable<propertyinfo> keyedproperties = properties.where(x => x.name.contains("id"));      foreach (propertyinfo property in keyedproperties)     {         if (property.name == "id")         {             this.addprimarykey(type.name, property.name);         }         else if (property.name.endswith("id"))         {             this.addforeignkey(type.name, property.name);         }     } }

to fix code have it, instead of 

   type fieldtype = field.gettype();

you want

type fieldtype = field.fieldtype;

and work. fieldinfo pass through. when call gettype(), type you're getting fieldinfo type information. fieldinfo contains information field, , type information held in fieldinfo.fieldtype.

if step through code, see behavior. debugging useful.


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