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LINQ and Dynamic Predicate Construction at Runtime

, 13 Aug 2008 CPOL
Illustrating a multi-predicate injection pattern now possible with the new features of C# 3.0.
LINQDynamicPredicate_demo.zip
LINQDynamicSearchDemo
App_Data
Global.asax
NorthwindDB.dbml
NorthwindDB.dbml.layout
Properties
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace LINQDynamicSearchDemo {

    public static class Config {
        public static NorthwindDBDataContext GetCurrentContext() {

            NorthwindDBDataContext ctx = HttpContext.Current.Items["RequestContext"] as NorthwindDBDataContext;
            if (ctx != null)
                return ctx;

            // huh? how did that get disposed of?
            throw new NullReferenceException("Somehow the context wasn't created when the request began, or has since been destroyed. Might needs be checking on that.");
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

dave.dolan

United States United States
Dave works all day, and stays up all night coding and reading, surfing the intertubes.

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