Comparison operators not supported for type 'System.String[]'

Question

why this line:

var category = _dataContext.Categories.Where(p => p.Keywords.Split(\' \').Contains(context.Request.QueryStrin         


        

Answer 1

string.split is not supported in LINQ-to-SQL.

There's an easy fix. Select all the data and do the filtering in the client. This may not be very efficient depending on the number of categories.

var category = 
    _dataContext.Categories.ToList()
    .Where(p => p.Keywords.Split(' ').Contains(context.Request.QueryString["q"])).First();

Calling .ToList() will force enumeration of all the categories from your datasource, and the subsequent operations will be performed in the client code.