I looked over the answers and didn't see the solution I found mentioned. If it was, my apologies. In my case, currently using Visual Studio 2015. In the solution explorer, right click on the Project file and click properties. Go to the Debug tab and this should have info for how you're launching "IIS Express or Web(DNX)" for the first two drop downs, and then there should be a checkmark box for "Launch URL:". Uncheck this option and your browser won't be automatically launched everytime you go to debug your application. Hope this helps someone out.

打开启动项目的属性(project→{ProjectName} properties…从主菜单或在“解决方案资源管理器”中右键单击项目并选择“属性”)，然后导航到“Web”选项卡，在“开始操作”下选择“不打开页面”。等待来自外部应用程序的请求。

您仍然可以使用任何浏览器(或Fiddler，无论什么)来访问正在运行的应用程序，但它不会自动打开浏览器窗口，它只是在后台启动并等待任何请求。

There seems to be one case in which none of the above but the following helps. I'm developing a project for Windows Azure cloud platform and I have a web role. There is indeed a radio button Don't open page in Project -> {Project name} properties... as was pointed out by Pawel Krakowiak, but it has no effect in my case whatsoever. However, there is the main cloud project in solution explorer and there is the Roles folder under it. If I right click my web role in this folder and choose Properties, I get another set of settings and on the Configuration tab there is the Launch browser for flag, after unchecking it a new browser window is not opened on application start up.

由于我的VS (Visual Studio Enterprise 2017)中没有上述选项，我不得不寻找其他选项。

以下是我的发现:

进入“工具->选项->调试”选项卡(通用)，取消选中“为Asp启用JavaScript调试”。Net(Chrome和IE)。

我已经通过以下步骤解决了我的问题。 进入工具>>单击选项>>单击项目和解决方案>> web项目>> 取消“关闭浏览器时停止调试”选项

这个变通方法对我来说适用于VS 2019

工具=>选项

然后在搜索框中键入项目和解决方案。

选择Web项目。

然后取消下面的选项。

关闭浏览器窗口时停止调试器，调试停止时关闭浏览器。

这对我很有用。希望这能有所帮助。