Language-Integrated Query (LINQ) is the name for a set of technologies of .NET Framework. This component adds data query capabilities directly into the C# language.
LINQ expressions are like SQL statements and can be used to extract and process data from arrays, classes, XML and databases.
Data Source - Query Expression - Execute
Methods
Examples
Example 1. Fundamental query concepts
// data source
int[] int_array = new int[] { 5, 4, 2, 8, 10 }; // query expression
IEnumerable<int> intQuery =from int_v in int_array
where int_v >= 5
select int_v;
// Execute the query
foreach (int i in intQuery)
{
MessageBox.Show(i.ToString());
}
Example 2. Order by query
IEnumerable<int> intQuery =
from int_v in int_array
where int_v >= 5
orderby int_v ascending
select int_v;
Example 3. Implement RANK function
Example 4. IsNumeric
Example 5. Order By Key Dictionary
