Question

I'm trying to filter with LINQ a list of this type List<Dictionary<String, Object>> but I can't find the way.

I have this code:

private List<Dictionary<String, Object>> ValidateScenarioProductItemData(List<Dictionary<String, Object>> pList)
{
    foreach (var tItem in pList)
    {
        if (!string.IsNullOrEmpty(tItem["IsInternal"].ToString()))
        {
            var i = 0;
            foreach (var item in tPeriods)
            {
                i++;
                var tHasSails = tCycleProductItemSales.Where(
                        CPIS => CPIS.CycleId == Convert.ToInt32(tItem["CycleId"].ToString()) &&
                        CPIS.ProductItemId == Convert.ToInt32(tItem["ProductItemId"].ToString()) && 
                        CPIS.PeriodId == Convert.ToInt32(item.Id.ToString()));
                if (tHasSails.Count() == 0)
                {
                    tItem[string.Format("Datasource{0}Id", i)] = 0;
                }
            }
        }

    }
    return pList;
}

I want to filter pList in the foreach to avoid by the Key IsInternal to avoid asking the next if and to avoid unnecessary calls.

I have tried this but it does not work: Filtering out values from a C# Generic Dictionary

Answer 1

如果我说得对，你需要过滤掉键是“IsInternal”且对象不为空的字典项，那么这个怎么样 -

var filteredList = pList.Where(d => d.Keys.Contains("IsInternal") && d.Values != null);

Answer 2

当您遍历2个数据源时，我认为您无法将其加入1个LINQ。您可以做的最好的事情是将第一个条件加入.Where子句

private List<Dictionary<String, Object>> ValidateScenarioProductItemData(List<Dictionary<String, Object>> pList)
{
    var tPeriods = new List<dynamic>();
    var tCycleProductItemSales = new List<dynamic>();
    foreach (var tItem in pList.Where(x=>!string.IsNullOrEmpty(x["IsInternal"].ToString())))
    {
        var i = 0;
        foreach (var item in tPeriods)
        {
            i++;
            var tHasSails = tCycleProductItemSales.Where(CPIS => CPIS.CycleId == Convert.ToInt32(tItem["CycleId"].ToString()) && CPIS.ProductItemId == Convert.ToInt32(tItem["ProductItemId"].ToString()) && CPIS.PeriodId == Convert.ToInt32(item.Id.ToString()));
            if (!tHasSails.Any())
            {
                tItem[string.Format("Datasource{0}Id", i)] = 0;
            }
        }
    }
    return pList;
}

Filter generic list with generic dictionary

2 个答案: