Compiler Error CS0745
Expected contextual keyword 'by'
The pattern for the group clause is group...by followed by an optional into, as shown in the following example:
string[] names = { "Bob", "Bill", "Jonetta", "Mary" };
var query = from name in names
group name by name[0];
or
var query2 = from name in names
group name by name[0] into g
//...additional query clauses
To correct this error
- Add the by keyword to the group clause.
Example
The following code generates CS0745:
// cs0745.cs
using System;
using System.Linq;
public class C
{
public static int Main()
{
string[] names = { "Bob", "Bill", "Jonetta", "Mary" };
var query = from name in names
group name name[0]; // CS0745
return 1;
}
}
See Also
Concepts
LINQ Query Expressions (C# Programming Guide)