在 ASP.NET 5 中如果不进行显示错误信息的相关配置，在发生错误时，在浏览器中只能看到空白页面。
显示错误信息的配置方法如下：
1）在 project.json 中添加对 Microsoft.AspNet.Diagnostics 的引用
{
"dependencies":{
"Microsoft.AspNet.Diagnostics": "1.0.0-*"
}
}
2）在 Startup.cs 中添加 app.UseErrorPage()
public class Startup { public void Configure(IApplicationBuilder app) { app.UseErrorPage(); } }
错误信息显示页面示例：
An error occurred during the compilation of a resource required to process this request. Please review the following specific error details and modify your source code appropriately. /Views/Shared/_Layout.cshtml ‘IHtmlHelper<dynamic>‘ does not contain a definition for ‘TabLink‘ and the best extension method overload ‘HtmlHelperExtensions.TabLink(HtmlHelper, string, string, string)‘ requires a receiver of type ‘HtmlHelper‘
原文：http://www.cnblogs.com/dudu/p/4605639.html