1

我有一个要插入到字典中的集合,并且已经在 KVP 中输入了一些值。假设我已经有一个“4000”键并且值再次出现,该值会发生什么?它是否将键实例的值添加到该键已经存在的值中?它是否覆盖了值?

如果它覆盖,我如何在它们遍历值集合时添加值?

public class AccountBalance
{
    public decimal balance { get; set; }
    public bool balancesheetact { get; set; }

    public AccountBalance()
    {
        balance = 0;
        balancesheetact = false;
    }

}

Dictionary<string, List<AccountBalance>> balances = new Dictionary<string, List<AccountBalance>>();
var jentries = from je in gl.JEHeaders
               where je.ped_int_id >= beginperiod && je.ped_int_id <= endperiod
               orderby je.ped_int_id
               select je;

bool isBalanceSheet;

foreach (JEHeader header in jentries)
{
    foreach (JEDetail entry in header.JEDetails)
    {
        string subAccount = entry.ChartOfAccounts.acc_ext_id.Trim();
        string key = subAccount.Remove(0, 4);

        if (entry.ChartOfAccounts.acc_ty >= 15320 && entry.ChartOfAccounts.acc_ty <= 15322)
            isBalanceSheet = true;
        else
            isBalanceSheet = false;


        AccountBalance value = null;

        if (!balances.ContainsKey(key))
        {
            List<AccountBalance> account_balances = new List<AccountBalance>();
            //   for (int i = 0; i < 12; ++i)
            for (int i = 0; i < 14; ++i)
                account_balances.Add(new AccountBalance());

            balances.Add(key, account_balances);
        }

        //   value = balances[key][header.ped_int_id % beginperiod];
        value = balances[key][(header.ped_int_id % beginperiod) + 1];


        /// NEW
        if (header.ped_int_id == 637)
            value = balances[key][0];
        ///  end NEW

        if (entry.jnl_pst_deb_at != null)
            value.balance += entry.jnl_pst_deb_at.HasValue ? entry.jnl_pst_deb_at.Value : 0;
        if (entry.jnl_pst_crd_at != null)
            value.balance -= entry.jnl_pst_crd_at.HasValue ? entry.jnl_pst_crd_at.Value : 0;

        if (isBalanceSheet == true)
            value.balancesheetact = true;
        else
            value.balancesheetact = false;


    }
}

balances = balances.OrderBy(kvp => kvp.Key).ToDictionary(xyz => xyz.Key, xyz => xyz.Value);
int row = 0;
decimal ytdbalance;
foreach (KeyValuePair<string, List<AccountBalance>> account in balances)
{
    row++;
    //string subAccount = account.Key.Remove(0, 4);
    workbook.AddCell(row, 0, account.Key);
    ytdbalance = 0;

    bool BS = account.Value[0].balancesheetact;

    for (int i = 1; i < 13; ++i)
    {
        ytdbalance = ytdbalance + account.Value[i].balance;
        if (BS == true)
            workbook.AddCell(row, i + 1, ytdbalance);
        else
            workbook.AddCell(row, i + 1, account.Value[i].balance);

    }

}
4

3 回答 3

1

字典是一对一的映射,如果你需要一对多的映射,你可以创建一个Lookup

副本添加到字典将导致ArgumentException

于 2013-06-25T15:05:23.007 回答
1

它会覆盖。如果您想将价值添加到现有价值中,我相信您正在寻找:

if (dict.ContainsKey(key)) {
    dict[key] += newVal;
} else {
    dict[key] = newVal;
}

// or

int currentVal;
dict.TryGetValue(key, out currentVal);
dict[key] = currentVal + newVal;

您必须首先检查它是否存在,如果存在,则添加值并重新插入字典。如果它不存在,您可以像平常一样设置它。

注意这里的线程安全 - 如果您的字典是通过多个线程访问的,则此代码可能会使您的字典失控。

于 2013-06-25T15:07:05.387 回答
1

如果您只想在进行过程中添加值,而不是说Dictionary<String,String>您想要 Dictionary<String,List<String>>而不是仅仅调用 add 类似的东西

if (!myDict.ContainsKey(someKey))
{
   myDict.Add(someKey,new List<String>());
}
myDict[somekey].Add(somevalue);

无论如何,一种方法。

于 2013-06-25T15:10:43.493 回答