类型 'IEnumerable<>' 在未引用的程序集中定义。 System.Runtime

Question

我有一个引用 class 库的 asp.net 5 网络应用程序。

class 库使用 Entity Framework 7 执行查询。

public IEnumerable<Member> GetMemberyByFirstName(string firstName)
{
    var members = _context.Members.Where(m => m.FirstName.Contains(firstName));
    return memebers;
}

但是我得到这个编译错误

The type 'IEnumerable<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. *

Answer 1

像下面那样尝试return-

var members = _context.Members.Where(m => m.FirstName.Contains(firstName)).ToList();

另外，我不明白函数定义-

void IEnumerable<Member>

如果你想 return IEnumerable<Member> 它应该只是 IEnumerable<Member> 而不是 void IEnumerable<Member>

Answer 2

我已经想出了如何做到这一点，但只是想让信息可用。

它相当复杂，围绕着 project.json。

非常简短的回答是我将 class 库中的 project.json 更改为

{
    "version": "1.0.0-*",
    "description": "Member.Business Class Library",
    "authors": [ "bryan" ],
    "tags": [ "" ],
    "projectUrl": "",
    "licenseUrl": "",
    "frameworks": {
        "dnx451": { },
        "dnxcore50": {  
            "dependencies": {
               "Microsoft.CSharp": "4.0.1-beta-23516"
            }
        }
    },
    "dependencies": {
        "EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
        "Member.DataLayer": "1.0.0-*",
        "Member.Domain": "1.0.0-*",
        "System.Collections": "4.0.11-beta-23516",
        "System.Linq": "4.0.1-beta-23516",
        "System.Runtime": "4.0.21-beta-23516",
        "System.Threading": "4.0.11-beta-23516"
    }
}

可以在此处找到更多详细信息 - http://nodogmablog.bryanhogan.net/2016/01/the-type-is-defined-in-an-assembly-that-is-not-referenced-system-runtime/

类型 'IEnumerable<>' 在未引用的程序集中定义。 System.Runtime

The type 'IEnumerable<>' is defined in an assembly that is not referenced. System.Runtime

c#

asp.net-core

entity-framework-core

project.json