var results = multiColQuery.ToList(); // Find out how many columns you have in results. int columnCount = results[0].Count(); // Perform aggregate calculations Average, Max, and // Min on each column. // Perform one iteration of the loop for each column // of scores. // You can...
var results = multiColQuery.ToList(); // Find out how many columns you have in results. int columnCount = results[0].Count(); // Perform aggregate calculations Average, Max, and // Min on each column. // Perform one iteration of the loop for each column // of scores. ...
select many:将序列的每个元素投影到一个 System.Collections.Generic.IEnumerable`1,并将结果序列组合为一个序列。 参考:https://www.cnblogs.com/zhangyuanbo12358/p/4107882.html 例子1:select 1string[] text = {"Today is 2018-06-06","weather is sunny","I am happy"};23vartokens = text.Select(s...
我很确定你的括号被吉米偷走了。但它仍然可以编译。您需要的括号如下：
{min}"); }staticvoidMultiColumns(IEnumerable<string> strs){ Console.WriteLine("Multi Column Query:");// Create a query, multiColQuery. Explicit typing is used// to make clear that, when executed, multiColQuery produces// nested sequences. However, you get the same results b...
IEnumerable<T>,其項目是執行下列動作後所產生的結果:對collectionSelector的各個項目叫用一對多轉換函式source,然後再將每個序列項目及其對應的來源項目對應到結果項目。 例外狀況 ArgumentNullException source、collectionSelector或resultSelector為null。 範例
Note This example that nullable columns map to nullable types in the CLR (nullable types first appeared in version 2.0 of the .NET Framework), and that for SQL types that don't have a 1:1 correspondence with a CLR type (for example, nvarchar, char, text), the original SQL type is re...
Note This example that nullable columns map to nullable types in the CLR (nullable types first appeared in version 2.0 of the .NET Framework), and that for SQL types that don't have a 1:1 correspondence with a CLR type (for example, nvarchar, char, text), the original SQL type is re...
DataTable dt = new DataTable(); dt.Columns.Add("questionnaireId", typeof(int)); dt.Columns.Add("coachNodeId", typeof(int)); dt.Columns.Add("questionnaireNumber", typeof(int)); dt.Columns .Add("score", typeof(int)); dt.Rows.Add(new object[] {1,30, 1, 2}); dt.Rows.Add(...
.IncludeMany(a => a.Tags, then => then.Where(sub => sub.Name =="xxx")) .Where(s => s.Tags.AsSelect().Any(t => t.Name =="国语")) .ToList();//Otherfsql.Select<Xxx>() .Where(a => a.IsDelete ==0) .WhereIf(keyword !=null, a => a.UserName.Contains(keyword)) ...