/// <summary>
/// 数据库访问接口。
/// </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);
}这句:
return dataAccessFactory.CreateDataAccess(connectionString, providerType);
/// 数据库访问接口。
/// </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);
}这句:
return dataAccessFactory.CreateDataAccess(connectionString, providerType);
解决方案 »
- C#中关于N级遍历的添加问题
- C#委托中出现死循环,怎么办?
- ArrayList包含Hashtable 如何读取?
- 急求水晶报表直打印的遗漏问题(.net2005 版)
- ADO——数据库
- WINFORM,我怎么样让DataGridView默认有10行空行,保存时怎么知道保存那几行?谢谢!
- 我有一个笔试,题目,哪位大侠能帮忙作一下笔试题目?
- 谁有代码或者是可以可以作出象VS.Net一样的菜单和工具条?
- 求救:如何把一个int类型的数值的二进制数字直接显示出来啊?
- 有关打印的问题,在线等。
- 关于DateSet的一个问题
- 如何将System.Drawing.Point转换成System.Drawing.Point[]??
--------------------------------------------------------------------------------未将对象引用设置到对象的实例。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。源错误:
行 16:
行 17: Interfaces.Data.IDataAccessFactory dataAccessFactory = (Interfaces.Data.IDataAccessFactory)Reservoir.Plugin.PluginOperator.Get("DataAccessFactory").CreateInstance();
行 18: return dataAccessFactory.CreateDataAccess(connectionString, providerType);
行 19: }
行 20: }
源文件: d:\web\reservoir.logic\container\dataaccess.cs 行: 18 堆栈跟踪:
[NullReferenceException: 未将对象引用设置到对象的实例。]
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: 调用的目标发生了异常。]
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): 未能创建类型为“ASP.WebForm1_aspx”的页。]
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)
Interfaces.Data.IDataAccessFactory dataAccessFactory = (Interfaces.Data.IDataAccessFactory)Reservoir.Plugin.PluginOperator.Get("DataAccessFactory").CreateInstance();
dataAccessFactory 返回为null,所以调用
return dataAccessFactory.CreateDataAccess(connectionString, providerType);出错。