c# - “/”应用程序中的服务器错误。键不能为空。参数名称：key

Question

有时我会回到制作报告的问题上，我在 stimulsoft 中使用它来报告：

Key cannot be null.
Parameter name: key
Description: 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.
Exception Details: System.ArgumentNullException: Key cannot be null.
Parameter name: key

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentNullException: Key cannot be null.
Parameter name: key]
System.Collections.Specialized.HybridDictionary.get_Item(Object key) +6238250
System.Web.Security.RolePrincipal.IsInRole(String role) +231
System.Web.Configuration.AuthorizationRule.IsTheUserInAnyRole(StringCollection roles, IPrincipal principal) +132
System.Web.Configuration.AuthorizationRule.IsUserAllowed(IPrincipal user, String verb) +264
System.Web.Configuration.AuthorizationRuleCollection.IsUserAllowed(IPrincipal user, String verb) +201
System.Web.Security.UrlAuthorizationModule.OnEnter(Object source, EventArgs eventArgs) +9025485
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

我们如何解决它？

tnx

Answer 1

System.Collections.Specialized.HybridDictionary.get_Item(Object key)
                                                                 ^
                                                  Key cannot be null.

查找您的源代码中您HybridDictionary通过密钥获取项目的位置，并检查该密钥是否不为空。