我在Linq To SQL数据上下文中有一个空引用异常，我什至不知道从哪里开始
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我刚刚在网站上部署了一个用户和角色的asp数据库，但出现此异常
你调用的对象是空的。
说明：执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪，以获取有关错误及其在代码中起源的更多信息。
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 41: #endregion
Line 42:
Line 43: public UsersAndRolesDataContext() :
Line 44: base(global::System.Configuration.ConfigurationManager.ConnectionStrings[\"ConnectionString\" ].ConnectionString, mappingSource)
Line 45: {
Source File: d:\\hosting\\7122544\\html\\SSM\\App_Code\\UsersAndRoles.designer.cs Line: 43
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
UsersAndRolesDataContext..ctor() in d:\\hosting\\7122544\\html\\SSM\\App_Code \\UsersAndRoles.designer.cs:43
admin_ManageUsers..ctor() in d:\\hosting\\7122544\\html\\SSM\\admin\\ManageUsers.aspx.cs:11
ASP.admin_manageusers_aspx..ctor() in c:\\windows\\Microsoft.NET\\Framework\\v4.0.30319\\Temporary ASP.NET Files\\ssm\\5b123e8f\\6bb9cf4c\\App_Web_tz5adhff.10.cs:0
__ASP.FastObjectFactory_app_web_tz5adhff.Create_ASP_admin_manageusers_aspx() in c:\\windows\\Microsoft.NET\\Framework\\v4.0.30319\\Temporary ASP.NET Files\\ssm\\5b123e8f\\6bb9cf4c\\App_Web_tz5adhff.12.cs:0
System.Web.Compilation.BuildResultCompiledType.CreateInstance() +32
System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp) +109
System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) +31
System.Web.UI.PageHandlerFactory.GetHandler(HttpContext context, String requestType, String virtualPath, String path) +37
System.Web.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +334
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184
没有找到相关结果
已邀请:
2 个回复
先对冈蒲
的连接字符串，因此返回null。赣借
<connectionStrings> <add name=\"AdventureWorksEntities\" connectionString=\"metadata=.\\AdventureWorks.csdl|.\\AdventureWorks.ssdl|.\\AdventureWorks.msl; provider=System.Data.SqlClient;provider connection string=\'Data Source=localhost; Initial Catalog=AdventureWorks;Integrated Security=True;Connection Timeout=60; multipleactiveresultsets=true\'\" providerName=\"System.Data.EntityClient\" /> </connectionStrings>