默认错误处理跳转是由HandleErrorAttribute处理的，

public class FilterConfig
{
  public static void RegisterGlobalFilters(GlobalFilterCollection filters)
  {
    filters.Add(new HandleErrorAttribute());
  }
}

FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

在Global.asax注销上面一段，就可使用web.config中的配置

<system.web>
  <compilation debug="true" targetFramework="4.5" />
  <httpRuntime targetFramework="4.5" />
  <customErrors mode="On" defaultRedirect="~/error.html" />
</system.web>

还可以自己重写HandleErrorAttribute

    public static void RegisterGlobalFilters(GlobalFilterCollection filters) {
        filters.Add(new ExceptionFilterAttribute());  //自己定义的过滤器        
    }
    
     /// <summary>
      /// 2.自己定义的过滤器 处理异常跳转错误页      
      /// 捕获异常 跳转到错误页      
      /// </summary>
    public class ExceptionFilterAttribute : HandleErrorAttribute {        
        public override void OnException(ExceptionContext filterContext) {            
            base.OnException(filterContext);            
            string excepitonInfo = filterContext.Exception.ToString();
            LogHelper.OutputLog(excepitonInfo);
            filterContext.HttpContext.Response.Redirect("/WebPages/Error.htm");
        }
    }