C# 列表<;T>;。addrange()不工作
我有财产:C# 列表<;T>;。addrange()不工作,c#,asp.net,C#,Asp.net,我有财产: public List<RequestCheckListDetail> DocumentChecklistMasterList { get { if (ViewState["DocumentChecklistMasterList"].IsObjectUsable()) _documentChecklistMasterList = (List<RequestCheckListDetail>)ViewStat
public List<RequestCheckListDetail> DocumentChecklistMasterList
{
get
{
if (ViewState["DocumentChecklistMasterList"].IsObjectUsable())
_documentChecklistMasterList = (List<RequestCheckListDetail>)ViewState["DocumentChecklistMasterList"];
else
this._documentChecklistMasterList = new List<RequestCheckListDetail>();
return this._documentChecklistMasterList;
}
set { ViewState["DocumentChecklistMasterList"] = value; }
}
这些代码都不能正常工作。
我仍然无法将项目添加到DocumentChecklistMasterList
请帮助我:
编辑:
IsObjectUsable()是我为检查对象是否为null而添加的扩展方法
public static bool IsObjectUsable(this object checkObject)
{
bool isUsable = true;
if (checkObject == null || checkObject == DBNull.Value)
{
isUsable = false;
}
return isUsable;
}
您收到的错误是什么?我没有收到任何错误,但列表始终显示计数为“0”。您如何检查列表中的值?此行
ViewState[“DocumentChecklistMasterList”]。IsObjectUsable()
可能总是返回false
。找出原因。我只是使用调试器点调试代码,并将列表绑定到gridview
List<RequestCheckListDetail> newList = new List<RequestCheckListDetail>();
int i = 0;
foreach (DocumentCheckListMaster item in list)
{
this.DocumentChecklistMasterList.Add(new RequestCheckListDetail
{
Id = i,
CheckListMaster = item
});
i++;
}
List<RequestCheckListDetail> newList = new List<RequestCheckListDetail>();
int i = 0;
foreach (DocumentCheckListMaster item in list)
{
this.DocumentChecklistMasterList.Insert(i,
new RequestCheckListDetail {
Id = i,
CheckListMaster = item
});
i++;
}
public static bool IsObjectUsable(this object checkObject)
{
bool isUsable = true;
if (checkObject == null || checkObject == DBNull.Value)
{
isUsable = false;
}
return isUsable;
}