错误：System.IO版本4.0.10.0和mscorlib版本4.0.0.0 DNX4.5.1中都存在StreamWriter

Question

我在visual studio 2015上的MVC应用程序中使用StreamWriter。它工作正常。然后我安装了.net版本管理器和beta 8 Web开发人员工具。然后我得到上面的错误说StremWriter存在于System.IO和mscorlib中。

我尝试使用全名，但这并没有解决Visual Studio中的错误。

除了回滚我为beta8所做的所有更改之外，还不太清楚如何解决这个问题。

Global.json
{
  "projects": [ "src", "test" ],
  "sdk": {
    "version": "1.0.0-beta8",
    "runtime": "clr",
    "architecture": "x86"
  }
}

project.json

"webroot": "wwwroot",
    "userSecretsId": "aspnet5-DecisionMaking-3b9017b0-7030-4235-9819-b3c8b1fb4a04",
    "version": "1.0.0-*",

    "dependencies": {
        "EntityFramework.SqlServer": "7.0.0-beta8",
        "EntityFramework.Commands": "7.0.0-beta8",
        "Microsoft.AspNet.Mvc": "6.0.0-beta8",
        "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta8",
        "Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta8",
        "Microsoft.AspNet.Authentication.Facebook": "1.0.0-beta8",
        "Microsoft.AspNet.Authentication.Google": "1.0.0-beta8",
        "Microsoft.AspNet.Authentication.MicrosoftAccount": "1.0.0-beta8",
        "Microsoft.AspNet.Authentication.Twitter": "1.0.0-beta8",
        "Microsoft.AspNet.Diagnostics": "1.0.0-beta8",
        "Microsoft.AspNet.Diagnostics.Entity": "7.0.0-beta8",
        "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta8",
        "Microsoft.AspNet.IISPlatformHandler": "1.0.0-beta8",
        "Microsoft.AspNet.Server.WebListener": "1.0.0-beta8",
        "Microsoft.AspNet.StaticFiles": "1.0.0-beta8",
        "Microsoft.AspNet.Tooling.Razor": "1.0.0-beta8",
        "Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta8",
        "Microsoft.Framework.Configuration.Json": "1.0.0-beta8",
        "Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta8",
        "Microsoft.Framework.Logging": "1.0.0-beta8",
        "Microsoft.Framework.Logging.Console": "1.0.0-beta8",
        "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta8",
        "System.IO": "4.0.10"
    },

    "commands": {
        "web": "Microsoft.AspNet.Server.Kestrel",
        "ef": "EntityFramework.Commands"
    },

    "frameworks": {
        "dnx451": { },
        "dnxcore50": {
            "dependencies": {
            }
        }
    },

    "exclude": [
        "wwwroot",
        "node_modules",
        "bower_components"
    ],
    "publishExclude": [
        "node_modules",
        "bower_components",
        "**.xproj",
        "**.user",
        "**.vspscc"
    ],
    "scripts": {
        "prepublish": [ "npm install", "bower install", "gulp clean", "gulp min" ]
    }

我可以从我的project.json文件中删除System.IO但是想确定这是正确的举动。我假设默认包含mscorlib，所以我唯一的选择是删除System.IO。我不得不将其与beta 5相提并论，但也许8不再需要它。还不确定旧的mscorlib版本。