我知道空引用异常通常总是含糊不清,任何数量的东西都可以产生它,但我在这里没有想法......发生的事情是当我尝试点击食谱类别链接时,我收到了这个错误:
NullReferenceException: Object reference not set to an instance of an object.
Company.BusinessLayer.Recipes.SearchManager.GetRecipes(Int64 folderId, String searchTerm, Int32 pageIndex, Int32 pageSize, Int32& categoryCount, Int32& pageCount) +1020
TargetInvocationException: Exception has been thrown by the target of an invocation.
Comapny.Website.Controls.Recipes.CategoryControl.ods_Selected(Object sender, ObjectDataSourceStatusEventArgs e) +940
System.Web.UI.WebControls.ObjectDataSourceView.OnSelected(ObjectDataSourceStatusEventArgs e) +103
System.Web.UI.WebControls.ObjectDataSourceView.InvokeMethod(ObjectDataSourceMethod method, Boolean disposeInstance, Object& instance) +431
System.Web.UI.WebControls.ObjectDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1953
System.Web.UI.WebControls.BaseDataList.GetData() +56
System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +177
System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +64
System.Web.UI.WebControls.BaseDataList.DataBind() +55
Company.Website.Controls.Recipes.CategoryControl.OnPreRender(EventArgs e) +138
System.Web.UI.Control.PreRenderRecursiveInternal() +103
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496
我不知道什么被处理为空。这是来自 SearchManager.cs 的代码和错误消息引用的 GetRecipes 方法。数据都在数据库中,任何内容都不应该为空。在我升级该项目所依赖的程序集之前,它曾经一度工作。唯一改变的是程序集使用 int64 而不是 int,但是为了构建该死的项目,我不得不将它们转换为 int。尽管我认为在这种情况下应该没关系。我不知道我在这里抓住空气。
public ContentBase[] GetRecipes(long folderId, string searchTerm, int pageIndex, int pageSize, out int categoryCount, out int pageCount)
{
ContentBase[] mergedResultset = null;
IndexSearch idx = new IndexSearch();
idx.XmlConfigId = 8;
idx.FolderId = folderId;
idx.Recursive = true;
// if a search term is provided, search this term
if (!string.IsNullOrEmpty(searchTerm))
{
searchTerm = searchTerm.Replace("'", "''");
// INDEX SEARCH BASED ON INGREDIENTS
Ektron.Cms.Controls.IndexSearch.SearchPram paramTerm = new Ektron.Cms.Controls.IndexSearch.SearchPram();
paramTerm.DataType = Ektron.Cms.Common.EkEnumeration.XMLDataType.String;
paramTerm.SearchType = Ektron.Cms.Common.EkEnumeration.XMLSearchRangeType.Contains;
paramTerm.XPath = "/root/Ingredients";
paramTerm.Value1 = searchTerm;
idx.AddParm(paramTerm);
idx.Search();
mergedResultset = (ContentBase[])idx.EkItems;
// CUSTOM SEARCH BASED ON TITLE
FolderData[] childFolders = GetChildFolders(folderId, true);
// Search based on title
Ektron.Cms.API.Search.SearchManager search = new Ektron.Cms.API.Search.SearchManager();
Ektron.Cms.ContentSearchCondition conditionAll = new Ektron.Cms.ContentSearchCondition();
conditionAll.setType = EkEnumeration.SearchType.AND;
ContentSearchCondition condFolderIds = new ContentSearchCondition();
// add condition folder Id for current folder and for each sub folder
condFolderIds.setType = EkEnumeration.SearchType.OR;
AddFolderIdCondition(condFolderIds, folderId);
foreach (FolderData fd in childFolders)
{
AddFolderIdCondition(condFolderIds, fd.Id);
}
conditionAll.AddCondition(condFolderIds);
ContentSearchCondition condTerm = new ContentSearchCondition();
condTerm.setType = EkEnumeration.SearchType.LIKE;
condTerm.setValue = searchTerm;
condTerm.setVariable = "content.content_title";
conditionAll.AddCondition(condTerm);
ContentSearchCondition condType = new ContentSearchCondition();
condType.setType = EkEnumeration.SearchType.EQUAL;
condType.setValue = 8;
condType.setVariable = "content.xml_config_id";
conditionAll.AddCondition(condType);
ContentData[] contents = search.Execute(conditionAll);
mergedResultset = MergeResultsets(idx.EkItems, contents, "/Recipes/Detail.aspx");
// rewrite all quicklinks with url alias
IDictionary<int, string> aliases = new UrlAliasApi().GetUrlAliasesByType(Company.DataLayer.Enumeration.UrlAliasType.Recipe);
foreach (ContentBase recipe in mergedResultset)
{
// if alias exists, overwrite quicklink!
string alias;
if (aliases.TryGetValue((int)recipe.Id, out alias))
{
recipe.QuickLink = alias;
}
}
}
// otherwise search based without parameter (fake param)
else
{
// if category recipes not already in cache, get them through ektron, otherwise, just get them from cache
if (RecipeCategoryCache.Current.Categories.ContainsKey((int)folderId) && RecipeCategoryCache.Current.Categories[(int)folderId] != null && RecipeCategoryCache.Current.Categories[(int)folderId].Length > 0)
{
mergedResultset = RecipeCategoryCache.Current.Categories[(int)folderId];
}
else
{
Ektron.Cms.Controls.IndexSearch.SearchPram param = new Ektron.Cms.Controls.IndexSearch.SearchPram();
param.DataType = Ektron.Cms.Common.EkEnumeration.XMLDataType.Boolean;
param.SearchType = Ektron.Cms.Common.EkEnumeration.XMLSearchRangeType.True;
param.XPath = "/root/Viewable";
idx.AddParm(param);
idx.Search();
mergedResultset = (ContentBase[])idx.EkItems;
// rewrite all quicklinks with url alias
IDictionary<int, string> aliases = new UrlAliasApi().GetUrlAliasesByType(Company.DataLayer.Enumeration.UrlAliasType.Recipe);
foreach (ContentBase recipe in mergedResultset)
{
// if alias exists, overwrite quicklink!
string alias;
if (aliases.TryGetValue((int)recipe.Id, out alias))
{
recipe.QuickLink = alias;
}
}
RecipeCategoryCache.Current.Categories[(int)folderId] = mergedResultset;
}
}
categoryCount = mergedResultset.Length;
// if page size provided is 0, No paging,
// if more than 0, calculate paging
if (pageSize > 0 && mergedResultset.Length > 0)
{
PagingHelper pgHelper = new PagingHelper();
pgHelper.CalculatePagingInfo(pageIndex, categoryCount, pageSize);
pageCount = pgHelper.NumberOfPages;
List<ContentBase> lst = new List<ContentBase>();
for (int i = pgHelper.StartIndex; i < pgHelper.EndIndex; i++)
{
lst.Add(mergedResultset[i]);
}
return lst.ToArray();
}
else
{
pageCount = 1;
return mergedResultset;
}
}