There is a piece of code that always reports errors!

kindred13

/// <summary>
/// Database access interface.
/// </ summary>
public static Interfaces.Data.IDataAccess CreateInstance ()
{
string connectionString = Reservoir.Configuration.GeneralOperator.Get ("ConnectionString");
string providerType = Reservoir.Configuration.GeneralOperator.Get ("ProviderType");

Interfaces.Data.IDataAccessFactory dataAccessFactory = (Interfaces.Data.IDataAccessFactory) Reservoir.Plugin.PluginOperator.Get ("DataAccessFactory"). CreateInstance ();
return dataAccessFactory.CreateDataAccess (connectionString, providerType);
}

This sentence:
return dataAccessFactory.CreateDataAccess (connectionString, providerType);

kindred13

Server error in "/Reservoir.Web" application.
-------------------------------------------------- ------------------------------

Object reference is not set to an instance of the object.
Explanation: An unhandled exception occurred during the execution of the current web request. Check the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: The object reference was not set to an instance of the object.

Source error:


Line 16:
Line 17: Interfaces.Data.IDataAccessFactory dataAccessFactory = (Interfaces.Data.IDataAccessFactory) Reservoir.Plugin.PluginOperator.Get ("DataAccessFactory"). CreateInstance ();
Line 18: return dataAccessFactory.CreateDataAccess (connectionString, providerType);
Line 19:}
Line 20:}
 

Source file: d:\web\reservoir.logic\container\dataaccess.cs Line: 18

Stack trace:


[NullReferenceException: An object reference was not set to an instance of the object. ]
   Reservoir.Logic.Container.DataAccess.CreateInstance () in d:\web\reservoir.logic\container\dataaccess.cs: 18
   Reservoir.Logic.Container.NewsCategory.CreateOperator () in d:\web\reservoir.logic\container\newscategory.cs: 28
   Reservoir.Web.WebForm1..ctor () in d:\web\reservoir.web\webform1.aspx.cs: 21
   ASP.WebForm1_aspx..ctor () in c:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\Temporary ASP.NET Files\reservoir.web\ed4d0d83\10b44cec\1ocuembo.0.cs: 0

[TargetInvocationException: An exception occurred in the target of the call. ]
   System.RuntimeType.CreateInstanceImpl (Boolean publicOnly) +0
   System.Activator.CreateInstance (Type type, Boolean nonPublic) +66
   System.Activator.CreateInstance (Type type) +7
   System.Web.HttpRuntime.CreatePublicInstance (Type type)
   System.Web.UI.TemplateControlParser.GetCompiledInstance (String virtualPath, String inputFile, HttpContext context)

[HttpException (0x80004005): Failed to create a page of type "ASP.WebForm1_aspx". ]
   System.Web.UI.TemplateControlParser.GetCompiledInstance (String virtualPath, String inputFile, HttpContext context)
   System.Web.UI.PageParser.GetCompiledPageInstanceInternal (String virtualPath, String inputFile, HttpContext context)
   System.Web.UI.PageHandlerFactory.GetHandler (HttpContext context, String requestType, String url, String path)
   System.Web.HttpApplication.MapHttpHandler (HttpContext context, String requestType, String path, String pathTranslated, Boolean useAppConfig)
   System.Web.MapHandlerExecutionStep.System.Web.HttpApplication + IExecutionStep.Execute ()
   System.Web.HttpApplication.ExecuteStep (IExecutionStep step, Boolean&completedSynchronously)

kalian2000

Breakpoint to see if the dataAccessFactory is empty?

kindred13

The .dataAccessFactory upstairs is indeed empty. Then how to track it?

冷雨雪

Check your code,
Interfaces.Data.IDataAccessFactory dataAccessFactory = (Interfaces.Data.IDataAccessFactory) Reservoir.Plugin.PluginOperator.Get ("DataAccessFactory"). CreateInstance ();
dataAccessFactory returns null, so call
return dataAccessFactory.CreateDataAccess (connectionString, providerType); Error.

kindred13

I tracked it. I don't know why it returns empty, I am a novice. Can you help me debug the project?

suncat10

Are you calling someone else's component, then you only need to know someone else's component code, or you want that component's person to tell you how to use it. If you can't see you try using Reflect to see the source code of this component.

天风鲁伊

Decompile the DLL you used with Reflect