c#程序在DLL中找不到函数

我有一个c#程序在C DLL中调用函数的问题。我使用VS 2015。

第一次调用XBaseResolveAll工作，但调用XBaseSeek会导致弹出这样的提示:

An unhandled exception of type 'System.EntryPointNotFoundException' occurred in Call_C.exe
Additional information: Unable to find an entry point named 'XBaseSeek' in DLL 'W:'C_sharp'Call_C'Debug'C_dll.dll'.

请注意，dll的dumpbin显示所有函数都已按预期导出。如下所示:

我已经尝试搜索，但没有发现这个问题讨论。所以我一定是做了什么蠢事，只是我没看到而已。我创建了一个小示例来说明这个问题。

有人能帮忙吗?

下面是示例文件:

----------
Program.cs
----------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using XBaseNamespace.SecondNamespace;

namespace Call_C
{
    class Program
    {
        static void Main()
        {
            XBaseFunctions.XBaseResolveAll();
            XBaseFunctions.XBaseSeek(UIntPtr.Zero, 0, 0);
            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }
    }
}
-----------------
XBaseNamespace.cs
-----------------
//  XBase functions
using System;
using System.Runtime.InteropServices;
namespace XBaseNamespace.SecondNamespace
{
    class XBaseFunctions
    {
        [DllImport("W:''C_sharp''Call_C''Debug''C_dll.dll", CharSet = CharSet.Ansi)]
        public static extern int XBaseResolveAll();
        [DllImport("W:''C_sharp''Call_C''Debug''C_dll.dll", CharSet = CharSet.Ansi)]
        public static extern int XBaseSeek(UIntPtr myhandle, long offset, int origin);
    }
} 
-------
c_dll.c
-------
//  C DLL experiment
#include <stdio.h>
#define DSI_DLL __declspec(dllexport)
#define CALL_TYPE __stdcall
DSI_DLL int CALL_TYPE XBaseResolveAll()
{
    return 0;
}

DSI_DLL int CALL_TYPE XBaseSeek(unsigned int *handle, long offset, int origin)
{
    return 0;
}
---------------
Output of build
---------------
1>------ Rebuild All started: Project: C_dll, Configuration: Debug Win32 ------
1>  c_dll.c
1>     Creating library W:'C_sharp'Call_C'Debug'C_dll.lib and object W:'C_sharp'Call_C'Debug'C_dll.exp
1>  C_dll.vcxproj -> W:'C_sharp'Call_C'Debug'C_dll.dll
2>------ Rebuild All started: Project: Call_C, Configuration: Debug Any CPU ------
2>  Call_C -> W:'C_sharp'Call_C'bin'Debug'Call_C.exe
========== Rebuild All: 2 succeeded, 0 failed, 0 skipped ==========
-----------------------
output from dumbbin.exe
-----------------------
C:'Program Files (x86)'Microsoft Visual Studio 11.0'Common7'IDE>"C:'Program Files (x86)'Microsoft Visual Studio 11.0'VC'bin'dumpbin.exe" /exports "W:'C_sharp'Call_C
'Debug'C_dll.dll"
Microsoft (R) COFF/PE Dumper Version 11.00.60610.1
Copyright (C) Microsoft Corporation.  All rights reserved.

Dump of file W:'C_sharp'Call_C'Debug'C_dll.dll
File Type: DLL
  Section contains the following exports for C_dll.dll
    00000000 characteristics
    562D7696 time date stamp Sun Oct 25 20:40:54 2015
        0.00 version
           1 ordinal base
           2 number of functions
           2 number of names
    ordinal hint RVA      name
          1    0 00011028 _XBaseResolveAll@0 = @ILT+35(_XBaseResolveAll@0)
          2    1 00011082 _XBaseSeek@12 = @ILT+125(_XBaseSeek@12)
  Summary
        1000 .00cfg
        1000 .data
        1000 .idata
        2000 .rdata
        1000 .reloc
        1000 .rsrc
        5000 .text
       10000 .textbss
C:'Program Files (x86)'Microsoft Visual Studio 11.0'Common7'IDE>