This value could be // passed in dynamically at run time. // Variable columnQuery is an IEnumerable<int>. // The following query performs two steps: // 1) use Split to break each row (a string) into an array //
This list could also be dynamically populated at run time. string[] wordsToMatch = [ "Historically", "data", "integrated" ]; // Find sentences that contain all the terms in the wordsToMatch array. // Note that the number of terms to match is not specified at compile time....
(); MultiColumns(lines); }staticvoidSingleColumn(IEnumerable<string> strs,intexamNum){ Console.WriteLine("Single Column Query:");// Parameter examNum specifies the column to// run the calculations on. This value could be// passed in dynamically at run time.// Variable columnQ...
One way to dynamically specify multiple predicate filters is to use the Contains method, as shown in the following example. The query returns different results based on the value of id when the query is executed. C# Copy int[] ids = [ 111, 114, 112 ]; var queryNames = from student ...
If you're going to end up using LINQ queries right in the UI layer and databinding the data directly to a DataSources there's not much of a problem. The DataSource controls understand and can bind to the data no problem because they are already using Reflection to dynamically figure out ...
Need to perform a Custom Join in LINQ dynamically between two collections. The required behavior is explained using he SQL use-case scenario. Table Item1 columns ( Id, FloatField,DateField etc ) Table Item2 columns ( Id, Amount,DateField etc) ...
We could instead chain Union operators, but this would be inefficient. The ideal approach is to dynamically construct a lambda expression tree that performs anor-based predicate. Of all the things that will drive you to manually constructing expression trees, the need for dynamic predicates is the...
= delegate (string s) { return s.Length == 5; }; Func<string, string> extract = delegate (string s) { return s; }; Func<string, string> project = delegate (string s) { return s.ToUpper(); }; IEnumerable<string> query = names.Where(filter) .OrderBy(extract) .Select(project);...
Transposes the rows of a sequence into columns. Traverses a tree in a breadth-first fashion, starting at a root node and using a user-defined function to get the children at each node of the tree. Traverses a tree in a depth-first fashion, starting at a root node and using a user...
Selecting ColumnsMost times we get the entire row from the database:from p in db.Product where p.ProductID == 5 select p;However, sometimes getting all the fields is too wasteful so we want only certain fields, but still use our POCOs; something that is challenging for libraries that ...