如何在OrderBy中使用Linq查询结果？

Question

Here i had scenario to get the data in date wise of this month(Present month)

Excepted Result
     Date_time        sum(collection.amountreceived )  Sum(bank_deposit.depositamount)
       1/07/2014                 2000                 1000
       2/07/2014                 3000                 3000

Schema

bank_deposit

   agentid         (nvarchar(30))   
   depositamount   (DECIMAL(10,0))    
   date_time       (TIMESTAMP)

collection

   customeridn       (varchar(30))
   amountreceived    (DECIMAL(10,0))
   date_time         (TIMESTAMP)  
   agentid           (nvarchar(30))

Here I used union to get the datetime column data in one column

 var unionDateColumn = ((from agent in db.collections select agent.Date_Time)
        .Union(from u in db.bank_deposit select u.Date_Time)).ToList();

How can i use this unionDateColumn data for orderby and to get expected output?

Below is query for sum of amount but here my issue is how to

var model = (from coll in db.collections.Where(e => e.AgentID == item.AgentID)
                          let depositedAmount = db.bank_deposit.Where(d => d.AgentID == item.AgentID ).Sum(c => c.DepositedAmount) == null ? 0
                          : db.bank_deposit.Where(d => d.AgentID == item.AgentID).Sum(x => x.DepositedAmount)
                          let collectionAmount = db.collections.Where(c => c.AgentID == item.AgentID).Sum(c => c.AmountReceived) == null ? 0
                          : db.collections.Where(v => v.AgentID == item.AgentID).Sum(m => m.AmountReceived)
                          select new GetBalanceAmount
                          {
                              DepositedAmount = depositedAmount,
                                 CollectionAmount = collectionAmount
                          });

Answer 1

我假设您想按date_time排序结果

var result = unoinDateColumn.OrderBy(t=>t.Date_Time).ToList().;

Answer 2

Why FirstOrDefault ? i asume you want every row.

Sajeetharan's example: var result = unoinDateColumn.OrderBy(t=>t.Date_Time).ToList(); result is the same as "select * from unionDateColumn order by DateTime"

Your example: model.ToList().OrderByDescending(unoinDateColumn).FirstOrDefault();

is the same as "Select * from model orderby unionDateColumn" May i ask why you are handling each column seperately? insted of in one large array ?

Handle it in one array, and do like this model.OrderByDescending(x => x.Date_Time);

it will affect the object model and order it like this model = model.sortedBy(model.Date_Time);