我在Visual Studio 2017 RC中遇到问题，当我使用IIS Express运行MVC和/或WebAPI应用程序时，该应用程序实际上从未运行。取而代之的是，我在浏览器中停留在一个页面上，指示该页面正在尝试附加，从那里继续进行下去。如果我在浏览器中打开另一个选项卡/窗口，并尝试直接导航到启动URL，它将永久旋转。同样，当我使用dot net run命令运行该应用程序时，该应用程序将启动并运行良好。
I am having an issue with Visual Studio 2017 RC where when I run an MVC and/or WebAPI app using IIS Express the app never actually runs. Instead I get stuck with a page in the browser indicating it is trying to attach and from there it goes no further. If I open another tab/window in the browser and try to navigate directly to the launch URL, it just spins forever. Likewise when I run this using the dot net run command, the app launches and runs fine.
似乎没有任何错误可以看到，只是浏览器会无限旋转，而无需实际加载页面/端点。
There do not seem to be any errors that I can see, just that the browser spins indefinitely without actually ever loading the page/endpoint.
注意：在大多数情况下，这种情况都会发生。 VS中新创建的项目，没有任何更改，以前版本中的已知工作项目等。
Note: this occurs for most any circumstance. Newly created project in VS with no changes, known working project from previous versions, etc.
推荐答案您可以关注或投票解决该问题： https：//developercommunity.visualstudio / content / problem / 11391 / aspnet-core-iis-express-httplocalhost51733-failed.html
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看起来我们的解决方法是
Looks like our workarounds meanwhile are
- dotnet运行
- 发布到本地IIS。
- （未经测试：从core-1.1降级为core-1.0）
如果您不熟悉VS2017 / asp：
If you aren't familiar with VS2017/asp:
您已经拥有或可以通过查看菜单显示 其他工具栏：
You have, or can reveal via View Menu-->Other Toolbars :
调试工具栏-> dropdowncombobutton 说 [绿色箭头>] IIS Express
- 单击按钮的下拉箭头部分。
- Click on the dropdown downarrow part of the button.
您应该看到运行{yourprojectname} 选项。 这等效于在命令行中运行 dotnet {yourprojectname} 。
You should see a Run {yourprojectname} option. This is the equivalent of dotnet run {yourprojectname} from the commandline.
您可以配置下拉菜单中显示的选项，
You can configure the options that appear in the dropdown with
右键单击在解决方案资源管理器中的项目上-> 属性-> Debug
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Visual Studio 2017无法使用IIS Express运行核心应用
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