[ArgumentException: The parameters dictionary contains a null entry for parameter 'alb' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Images(Int32, Int32)' in 'WebSite.Controllers.CollegeController'. To make a parameter optional its type should be either a reference type or a Nullable type.
参数名: parameters]
System.Web.Mvc.ReflectedActionDescriptor.ExtractParameterFromDictionary(ParameterInfo parameterInfo, IDictionary`2 parameters, MethodInfo methodInfo) +270758
System.Linq.WhereSelectArrayIterator`2.MoveNext() +110
System.Linq.Buffer`1..ctor(IEnumerable`1 source) +548
System.Linq.Enumerable.ToArray(IEnumerable`1 source) +108
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +177
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +31
System.Web.Mvc.<>c__DisplayClassa.<InvokeActionMethodWithFilters>b__7() +85
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +235491
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +288
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +235670
System.Web.Mvc.Controller.ExecuteCore() +174
System.Web.Mvc.MvcHandler.ProcessRequest(HttpContextBase httpContext) +209
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +599
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171
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