August 17, 2014

LINQ to SqlServer

  • Create new project.
  • Add the linq2db.SqlServer nuget to the project.
  • Copy the LinqToDB.Templates\ to a folder where you would like to generate your data model, rename it, and delete .txt extension.
  • Modify the connection settings in the T4 template to connect to your database.
    <#@ template language="C#" debug="True" hostSpecific="True"                           #>
    <#@ output extension=".generated.cs"                                                  #>
    <#@ include file="$(ProjectDir)LinqToDB.Templates\LinqToDB.SqlServer.Tools.ttinclude" #>
    <#@ include file="$(ProjectDir)LinqToDB.Templates\PluralizationService.ttinclude"     #>
        NamespaceName = "DataModel";
        LoadSqlServerMetadata(@"DBHost\SqlServer2012", "Northwind", "sa", "TestPassword");
  • Add connection string to the web/app.config file:
    <?xml version="1.0" encoding="utf-8" ?>
            <add name="Northwind" providerName="System.Data.SqlClient"
                connectionString="Data Source=DBHost\SqlServer2012;Database=Northwind;User Id=sa;Password=TestPassword;" />
  • To access your database use the following code:
    using System;
    using System.Diagnostics;
    using System.Linq;
    using DataModel;
    using LinqToDB.Data;
    namespace LinqToDBDemo
        // Watch video on
        class Program
            static void Main(string[] args)
    #if DEBUG
                DataConnection.WriteTraceLine = (s, s1) => Debug.WriteLine(s, s1);
                using (var db = new NorthwindDB())
                    var q =
                        from c in db.Customers
                        select new
                            OrderCount = c.Orders.Count()
                    foreach (var c in q)

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