C# 获取linq查询上下文之外的count变量

如何将计数分配给totalCases变量

我只是想知道我是否可以做如下的事情

 let count = DbContext.Set<CaseAction>().Count(c => c.IsToDo == isToDo) into totalCases 

let count=DbContext.Set（）

使用let声明的变量是否可以在查询上下文之外访问

 public PagedList GetCatTaskByCompanyId(int companyId, int? isToDo, int pageIndex, int pageSize)
            {
                var totalCases = 200;
                var caseModels = (from casemodel in DbContext.Set<CaseAction>()
                                  where casemodel.IsToDo == isToDo
                                  let count = DbContext.Set<CaseAction>().Count(c => c.IsToDo == isToDo)
                                  orderby casemodel.TaskCreatedOn descending
                                  select new CaseDetailsModel
                                  {
                                      TaskId = casemodel.Id,
                                      CompanyId = companyId,
                                      Title = casemodel.Title,
                                      TaskTypeId = casemodel.TaskTypeId,
                                      TaskTypeGroupId = casemodel.TaskTypeGroupId,
                                      CaseSubject = casemodel.TaskName,
                                      CurrentComment = casemodel.CurrentComment,
                                      IsPinned = casemodel.Pinned,
                                      CurrentActionTypeId = casemodel.CurrentActionTypeId,
                                      CurrentActionTypeName = casemodel.CurrentActionTypeName,
                                      NextActionDueOn = casemodel.NextActionDueOn,
                                      CurrentActionCreatedOn = casemodel.CurrentActionCreatedOn,
                                      CurrentActionAssignedTo = casemodel.AssignedToStaffName,
                                      NextActionTypeName = casemodel.NextActionTypeName,
                                      ActionCount = casemodel.ActionCount
                                  }).Skip(pageIndex * pageSize)
                                    .Take(pageSize)
                                    .ToList();

                return new PagedList
                {
                    Data = caseModels,
                    PageIndex = pageIndex,
                    PageSize = pageSize,
                    Count = totalCases
                };
            }

public PagedList GetCatTaskByCompanyId（int companyId，int？isToDo，int pageIndex，int pageSize）
{
var totalCases=200；
var caseModels=（来自DbContext.Set（）中的casemodel）
其中casemodel.IsToDo==IsToDo
让count=DbContext.Set（）.count（c=>c.IsToDo==IsToDo）
orderby casemodel.TaskCreatedOn
选择新案例详情模型
{
TaskId=casemodel.Id，
CompanyId=CompanyId，
Title=casemodel.Title，
TaskTypeId=casemodel.TaskTypeId，
TaskTypeGroupId=casemodel.TaskTypeGroupId，
CaseSubject=casemodel.TaskName，
CurrentComment=casemodel.CurrentComment，
IsPinned=casemodel.Pinned，
CurrentActionTypeId=casemodel.CurrentActionTypeId，
CurrentActionTypeName=casemodel.CurrentActionTypeName，
NextActionDueOn=casemodel.NextActionDueOn，
CurrentActionCreatedOn=casemodel.CurrentActionCreatedOn，
CurrentActionAssignedTo=casemodel.AssignedToStaffName，
NextActionTypeName=casemodel.NextActionTypeName，
ActionCount=casemodel.ActionCount
}).Skip（页面索引*页面大小）
.Take（页面大小）
.ToList（）；
返回新的页面列表
{
数据=案例模型，
PageIndex=PageIndex，
PageSize=PageSize，
计数=总案例数
};
}

删除

let

行，同时删除

totalCases

返回数据时，只需调用

Count（）

，将谓词传递到列表中

即

 return new PagedList
                {
                    Data = caseModels,
                    PageIndex = pageIndex,
                    PageSize = pageSize,
                    Count = caseModels.Count(c => c.IsToDo == isToDo)
                };