c# - Npgsql.NpgsqlConnection doesn't implement interface System.Collections.IEnumerator -

in visual studio created simple vnext console app , installed npgsql

install-package npgsql  

command.

here code, program.cs , project.json

using npgsql; using system;  namespace consoleapp3 { public class program {     public void main(string[] args)     {         console.writeline("hello postgresql!");         // specify connection options , open connection         npgsqlconnection conn = new npgsqlconnection("server=myserv;user id=postgres;" +                                 "password=postgres;database=mydb;");         conn.open();          // define query         npgsqlcommand cmd = new npgsqlcommand("select name mytb", conn);          // execute query         npgsqldatareader dr = cmd.executereader();          // read rows , output first column in each row         while (dr.read())             console.write("{0}\n", dr[0]);          // close connection         conn.close();         console.readline();     } } }   { "version": "1.0.0-*", "dependencies": {     "npgsql": "2.2.4.3",     "system.data.common": "4.0.0-beta-22605"  }, "commands": {     "consoleapp3": "run" }, "frameworks": {     "aspnet50": {         "frameworkassemblies": {             "system.data": "4.0.0.0"         }     }         } 

}

all working fine.

then copied code on machine mono , debian os.

mono --version  mono jit compiler version 3.12.1 (tarball fri mar  6 19:12:47 utc 2015) copyright (c) 2002-2014 novell, inc, xamarin inc , contributors. www.mono-       project.com tls:           __thread  sigsegv:       altstack   notifications: epoll     architecture:  amd64     disabled:      none  misc:          softdebug     llvm:          supported, not enabled.   gc:            sgen 

then made

kpm restore 

and

k run 

and got exception:

hello postgresql! npgsql.npgsqlconnection doesn't implement interface     system.collections.ienumerator stacktrace: @ <unknown> <0xffffffff> @ consoleapp3.program.main (string[]) <0x0004c>   @ (wrapper runtime-invoke) <module>.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <0xffffffff>   @ <unknown> <0xffffffff>   @ (wrapper managed-to-native) system.reflection.monomethod.internalinvoke (system.reflection.monomethod,object,object[],system.exception&) <0xffffffff>   @ system.reflection.monomethod.invoke (object,system.reflection.bindingflags,system.reflection.binder,object[],system.globalization.cultureinfo) <0x000d7>   @ system.reflection.methodbase.invoke (object,object[]) <0x0002a> @ microsoft.framework.runtime.common.entrypointexecutor.execute (system.reflection.assembly,string[],system.iserviceprovider) <0x0010b>   @ microsoft.framework.applicationhost.program.executemain (microsoft.framework.runtime.defaulthost,string,string[]) <0x0026f>   @ microsoft.framework.applicationhost.program.main (string[]) <0x0043f>   @ (wrapper runtime-invoke) <module>.runtime_invoke_object__this___object (object,intptr,intptr,intptr) <0xffffffff>   @ <unknown> <0xffffffff>   @ (wrapper managed-to-native) system.reflection.monomethod.internalinvoke (system.reflection.monomethod,object,object[],system.exception&) <0xffffffff>   @ system.reflection.monomethod.invoke (object,system.reflection.bindingflags,system.reflection.binder,object[],system.globalization.cultureinfo) <0x000d7>   @ system.reflection.methodbase.invoke (object,object[]) <0x0002a> @ microsoft.framework.runtime.common.entrypointexecutor.execute (system.reflection.assembly,string[],system.iserviceprovider) <0x0010b>   @ kre.host.bootstrapper.main (string[]) <0x002f3> @ (wrapper runtime-invoke) <module>.runtime_invoke_object__this___object (object,intptr,intptr,intptr) <0xffffffff> @ <unknown> <0xffffffff>   @ (wrapper managed-to-native) system.reflection.monomethod.internalinvoke (system.reflection.monomethod,object,object[],system.exception&) <0xffffffff>   @ system.reflection.monomethod.invoke (object,system.reflection.bindingflags,system.reflection.binder,object[],system.globalization.cultureinfo) <0x000d7>   @ system.reflection.methodbase.invoke (object,object[]) <0x0002a>   @ kre.hosting.runtimebootstrapper.executeasync (string[]) <0x01667>   @ kre.hosting.runtimebootstrapper.execute (string[]) <0x00053>   @ entrypoint.main (string[]) <0x00167>   @ (wrapper runtime-invoke) <module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <0xffffffff>  native stacktrace: mono() [0x4accac]    /lib/x86_64-linux-gnu/libpthread.so.0(+0xf0a0) [0x7f03a02c60a0]  /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f039ff5e165]   /lib/x86_64-linux-gnu/libc.so.6(abort+0x180) [0x7f039ff613e0]    mono() [0x6232f9]    mono() [0x623507]    mono() [0x6235b2]    mono() [0x4aebe7]    mono() [0x4af3c3]    [0x40ef3de6]  debug info gdb:  ================================================================= got sigabrt while executing native code.  indicates fatal error in mono runtime or 1 of native libraries  used application. ================================================================= aborted 

anybody has ideas how handle it?

problem in old version npgsql.dll, stored in mono gac. bootloader used old binaries instead brand new npgsql.dll nuget package.