所以我在使用自定义数据源时从 Telerik 的 RadGrid 得到这个异常,但我不知道我做错了什么。有什么线索吗?
“/”应用程序中的服务器错误。
Object reference not set to an instance of an object.
描述:
当前 Web 请求执行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源自代码的位置的更多信息。
异常详情:
System.NullReferenceException:对象引用未设置为对象的实例。
源错误:
在执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常起源和位置的信息。
堆栈跟踪:
[NullReferenceException: Object reference not set to an instance of an object.]
Telerik.Web.UI.GridResolveEnumerable.GetCollectionItemType(Boolean noItemsInEnumerator, Type& collectionItemType, Object& collectionFirstObject) +101
Telerik.Web.UI.GridResolveEnumerable.ParseProperties() +264
Telerik.Web.UI.GridResolveEnumerable.Initialize() +29
Telerik.Web.UI.GridResolveEnumerable.EnsureInitialized() +45
Telerik.Web.UI.GridResolveEnumerable.get_DataTable() +36
Telerik.Web.UI.GridEnumerableFromDataView..ctor(GridTableView owner, IEnumerable enumerable, Boolean CaseSensitive, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields, Boolean enableSplitHeaderText) +245
Telerik.Web.UI.GridDataSourceHelper.CreateGridEnumerable(GridTableView owner, IEnumerable enumerable, Boolean caseSensitive, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields, Boolean enableSplitHeaderText) +172
Telerik.Web.UI.GridDataSourceHelper.GetResolvedDataSource(GridTableView owner, Object dataSource, String dataMember, Boolean caseSensitive, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields, Boolean enableSplitHeaderText) +322
Telerik.Web.UI.GridTableView.get_ResolvedDataSource() +257
Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) +480
System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +67
System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +123
System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +33
System.Web.UI.WebControls.DataBoundControl.PerformSelect() +138
Telerik.Web.UI.GridTableView.PerformSelect() +38
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +30
Telerik.Web.UI.GridTableView.DataBind() +391
Telerik.Web.UI.RadGrid.DataBind() +191
Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason) +4251
Telerik.Web.UI.RadGrid.OnLoad(EventArgs e) +201
System.Web.UI.Control.LoadRecursive() +54
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Control.LoadRecursive() +145
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772
版本信息:Microsoft .NET Framework 版本:4.0.30319;ASP.NET 版本:4.0.30319.17929