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LINQ and Dynamic Predicate Construction at Runtime

, 13 Aug 2008 CPOL 119.6K 1.7K 83
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;
using System.ComponentModel;

namespace LINQDynamicSearchDemo {
    [DataObject]
    public partial class Employee : INotifyPropertyChanging, INotifyPropertyChanged {
        
        /// <summary>
        /// this actually doesn't need to be here, 
        /// I just used it so that I could generate the 
        /// list of columns on the GridView faster by 
        /// binding an ObjectDataSource to this datatype, 
        /// hooking it up, refreshing the schema, and then deleteing it.
        /// </summary>
        /// <returns></returns>
        public static IQueryable<Employee> GetAll() {
            var ctx = Config.GetCurrentContext();

            return ctx.Employees;
        }
        
    }
}

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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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