未将对象引用设置到对象的实例。 急求解？？？？？
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 195: {
行 196:
行 197: Database db = DatabaseFactory.CreateDatabase();
行 198:
行 199: DbCommand cmd = db.GetStoredProcCommand( "SearchKyxmByMc ");


源文件: F:\science\DataBusiness\Kyxm.cs 行: 197

堆栈跟踪:


[NullReferenceException: 未将对象引用设置到对象的实例。]
Microsoft.Practices.EnterpriseLibrary.Data.DatabaseConfigurationView.get_DefaultName() +45
Microsoft.Practices.EnterpriseLibrary.Data.DatabaseMapper.MapName(String name, IConfigurationSource configSource) +79
Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder.ConfigurationNameMappingStrategy.BuildUp(IBuilderContext context, Type t, Object existing, String id) +160
Microsoft.Practices.ObjectBuilder.BuilderBase`1.DoBuildUp(IReadWriteLocator locator, Type typeToBuild, String idToBuild, Object existing, PolicyList[] transientPolicies) +339
Microsoft.Practices.ObjectBuilder.BuilderBase`1.BuildUp(IReadWriteLocator locator, Type typeToBuild, String idToBuild, Object existing, PolicyList[] transientPolicies) +194
Microsoft.Practices.ObjectBuilder.BuilderBase`1.BuildUp(IReadWriteLocator locator, String idToBuild, Object existing, PolicyList[] transientPolicies) +111
Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder.EnterpriseLibraryFactory.BuildUp(IReadWriteLocator locator, IConfigurationSource configurationSource) +255
Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder.EnterpriseLibraryFactory.BuildUp(IConfigurationSource configurationSource) +72
Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder.NameTypeFactoryBase`1.CreateDefault() +79
Microsoft.Practices.EnterpriseLibrary.Data.DatabaseFactory.CreateDatabase() +88
DataBusiness.Kyxm.Search_mc(String kyxmmc) in F:\science\DataBusiness\Kyxm.cs:197
control_Search.Button1_Click(Object sender, EventArgs e) in f:\science\scienceWeb\control\Search.ascx.cs:141
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +75
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +97
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11

System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4919



[解决办法]
处理下异常被,加个判断
if(DatabaseFactory.CreateDatabase()!=null)
{
Database db = DatabaseFactory.CreateDatabase();
DbCommand cmd = db.GetStoredProcCommand( "SearchKyxmByMc ");
}
else
{
}
[解决办法]
对，应该是哪个变量没实例话成功，为null了，而且你还用了，
断点跟踪吧
[解决办法]
DatabaseFactory.CreateDatabase()应该返回为null