我已经阅读了一些看起来与此类似的线程,但是找不到解决我的问题的方法,我没有太多使用堆栈溢出,所以请耐心等待]
我有一个使用SqlDataReader的while循环,它从数据库中提取信息并将其放入如下所示的开发请求列表中
public ListOfDevelopmentRequestsModel GetDevRequests(List<SelectListItem> evaluators)
{
SqlCommand cmd = new SqlCommand(StoredProcedures.DevRequests.GetDevRequests, Conn);
cmd.CommandType = CommandType.StoredProcedure;
ListOfDevelopmentRequestsModel ListOfDevRequests = new ListOfDevelopmentRequestsModel();
Conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
DateTime requestDate = Convert.ToDateTime(reader["DateCreated"].ToString());
string requestorFirstName = reader["Staff First Name"].ToString();
string requestorLastName = reader["Staff Last Name"].ToString();
string requestorEmailAddress = reader["Staff Email"].ToString();
string solutionName = reader["SolutionName"].ToString();
string solutionDescription = reader["SoultionDescription"].ToString();
string solutionElementName = reader["SolutionElementName"].ToString();
string solutionElementDescription = reader["SolutionElementDescription"].ToString();
string itemToChange = reader["ItemChange"].ToString();
string changeDetails = reader["ChangeDetail"].ToString();
List<SelectListItem> evaluatorList = new List<SelectListItem>(DisplayCurrentEvaluator(evaluators, evaluator));
DevelopmentRequestModel DevRequest = new DevelopmentRequestModel
{
RequestDate = requestDate,
RequestorName = $"{requestorFirstName} {requestorLastName}",
RequestorEmailAddress = requestorEmailAddress,
SolutionName = solutionName,
SolutionDescription = solutionDescription,
SolutionElementName = solutionElementName,
SolutionElementDescription = solutionElementDescription,
ItemToChange = itemToChange,
ChangeDetails = changeDetails,
AccordionHeading = $"{(changeID.PadLeft(4, '0'))} - {requestorFirstName} {requestorLastName} - {itemToChange}"
};
ListOfDevRequests.DevelopmentRequests.Add(DevRequest);
}
Conn.Close();
return ListOfDevRequests;
}
我也有一个清单来获取请求的评估者
public static List<SelectListItem> GetEvaluators()
{
List<SelectListItem> evaluators = new List<SelectListItem>();
SqlCommand cmd = new SqlCommand(StoredProcedures.DevRequests.GetEvaluators, Conn);
cmd.CommandType = CommandType.StoredProcedure;
Conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
evaluators.Add(
new SelectListItem
{
Text = reader["Staff Name"].ToString(),
Value = reader["Staff Code"].ToString(),
});
}
Conn.Close();
return evaluators;
}
最后,我具有一个列表,该列表将传递上述评估者列表,并从数据库中提取评估者:string evaluator = reader["Evaluator"].ToString();
,并将根据评估者名称是否与文本值匹配来设置选择列表的默认值,并且将其设置为选定的选择列表项。
public List<SelectListItem> DisplayCurrentEvaluator(List<SelectListItem> evaluators, string evaluator)
{
foreach (var item in evaluators)
{
if (item.Text == evaluator)
{
item.Selected = true;
}
else
{
item.Selected = false;
}
}
return evaluators;
}
问题是,循环中的第一项具有评估者“ Bill”,并且“ Bill”被选中,并且工作正常,但是循环中的第二项是“ John”,并且将“ John”设置为selected ,它将“ Bill”作为第一项中的选定值替换为“ John”
由于我尝试了多种修复方法,但最终陷入困境,但是我很沮丧,不胜感激。
很抱歉,如果帖子的格式不好看,我可以尝试重新格式化并根据需要提供更多信息。
欢呼声
编辑代码:
GetDevRequests()
public ListOfDevelopmentRequestsModel GetDevRequests(List<SelectListItem> evaluators)
{
SqlCommand cmd = new SqlCommand(StoredProcedures.DevRequests.GetDevRequests, Conn);
cmd.CommandType = CommandType.StoredProcedure;
ListOfDevelopmentRequestsModel ListOfDevRequests = new ListOfDevelopmentRequestsModel();
Conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
List<SelectListItem> evaluatorList = new List<SelectListItem>();
while (reader.Read())
{
string changeID = reader["ChangeID"].ToString();
string evaluator = reader["Evaluator"].ToString();
string status = reader["Status"].ToString();
string priority = reader["Priority"].ToString();
string eliteID = reader["RequestorID"].ToString();
DateTime requestDate = Convert.ToDateTime(reader["DateCreated"].ToString());
string requestorFirstName = reader["Staff First Name"].ToString();
string requestorLastName = reader["Staff Last Name"].ToString();
string requestorEmailAddress = reader["Staff Email"].ToString();
string solutionName = reader["SolutionName"].ToString();
string solutionDescription = reader["SoultionDescription"].ToString();
string solutionElementName = reader["SolutionElementName"].ToString();
string solutionElementDescription = reader["SolutionElementDescription"].ToString();
string itemToChange = reader["ItemChange"].ToString();
string changeDetails = reader["ChangeDetail"].ToString();
evaluatorList = DisplayCurrentEvaluator(evaluators, evaluator);
DevelopmentRequestModel DevRequest = new DevelopmentRequestModel
{
ChangeID = (changeID.PadLeft(4, '0')),
Evaluator = evaluator,
Evaluators = evaluatorList,
Status = status,
Priority = priority,
EliteID = eliteID,
RequestDate = requestDate,
RequestorName = $"{requestorFirstName} {requestorLastName}",
RequestorEmailAddress = requestorEmailAddress,
SolutionName = solutionName,
SolutionDescription = solutionDescription,
SolutionElementName = solutionElementName,
SolutionElementDescription = solutionElementDescription,
ItemToChange = itemToChange,
ChangeDetails = changeDetails,
AccordionHeading = $"{(changeID.PadLeft(4, '0'))} - {requestorFirstName} {requestorLastName} - {itemToChange}"
};
ListOfDevRequests.DevelopmentRequests.Add(DevRequest);
}
Conn.Close();
return ListOfDevRequests;
}
DisplayCurrentEvaluator()
public List<SelectListItem> DisplayCurrentEvaluator(List<SelectListItem> selectListItems, string selectListDefaultItem)
{
foreach (var item in selectListItems)
{
item.Selected = item.Text == selectListDefaultItem;
}
return selectListItems;
}
问题在此行:
List<SelectListItem> evaluatorList = new List<SelectListItem>(DisplayCurrentEvaluator(evaluators, evaluator));
首先,这也可以写成
List<SelectListItem> evaluatorList = DisplayCurrentEvaluator(evaluators, evaluator);
您的DisplayCurrentEvaluator
已经返回了正确的列表,因此无需将其复制到新列表中。
但是这是次要的要点,就我所知,您不使用该evaluatorList。在该while循环的每次迭代中,您都在创建一个新的(可能不是您想要的),然后您就忘了它。我也看不到evaluator
设置在哪里,但这可能是在您未显示的代码中。
因此,您需要在循环之外一次生成此列表,并将其保存(可能在类级字段或属性中。)>
还有一个提示,该DisplayCurrentEvaluator方法也可以写成
public List<SelectListItem> DisplayCurrentEvaluator(List<SelectListItem> evaluators, string evaluator)
{
foreach (var item in evaluators)
{
item.Selected = item.Text == evaluator;
}
return evaluators;
}
EDIT
设置evaluator
,并使用得到的evaluatorList
您的DisplayCurrentEvaluator更新原始的评估者列表并返回它。这有效地导致每个evaluatorList指向相同的列表,最后一个更新将赢得该列表。因此,请确保您返回一个新列表。public List<SelectListItem> DisplayCurrentEvaluator(List<SelectListItem> evaluators, string evaluator)
{
var result = new List<SelectListItem>(evaluators.Count);
foreach (var item in evaluators)
{
result.Add(new SelectListItem { Text = item.Text, Value = item.Value, Selected= item.Text == evaluator};
}
return result;
}
另外,在循环内部声明evaluatorList(仅)。
var evaluatorList = DisplayCurrentEvaluator(evaluators, evaluator);