在执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。 [英] An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

问题描述

System.NullReferenceException: Object reference not set to an instance of an object.

我尝试了什么：

What I have tried:

Line 122:                                        
Line 123:                                            Select Class
Line 124:                                            @foreach (var item in Model.ClassList)
Line 125:                                            {
Line 126:                                                @item.ClassName

Source File: F:\Education_SD\CMS\CODE\CMS.Institute\Views\Report\StudentAttendanceReport.cshtml    Line: 124 

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   ASP._Page_Views_Report_StudentAttendanceReport_cshtml.Execute() in

推荐答案

问题在于 foreach 无法迭代ull变量，在你的情况下 Model.ClassList 为null ...

The problem is that foreach can not iterate a null variable, and in your case Model.ClassList is null...

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