ITDevSpace - Development Tips & Tricks

public class LambdaComparer<T> : IComparer<T> { public enum Direction { Asc = 1, Desc = -1 } private readonly Comparison<T> _comparison; public LambdaComparer(Comparison<T> comparison) { _comparison = comparison; } int IComparer<T>.Compare(T x, T y) { return _comparison(x, y); } public static LambdaComparer<T> IgnoreSortComparer() { return IgnoreSortComparer(Direction.Asc); } public static LambdaComparer<T> IgnoreSortComparer(Direction direction) { return new LambdaComparer<T>((x, y) => x.Equals(y) ? 0 : ( int )direction); } } public class Data { public int X; public int Y; } [Test] public void TestLambdaComparer() { var data = new Data[] { new Data() { X = 1, Y = 1 }, new Data() { X = 3, Y = 2 }, new Data() { X = 5, Y = 3 }, new Data() { X = 2, Y = 4 }, new Data() { X = 4, Y = 5 } }; Console.WriteLine(&quo

[Test] public void FindAndReplace() { var sql = @" SELECT * FROM Table_{@AsOf} WHERE Date='{@AsOf-1}' "; Console.WriteLine(" BEFORE: {0} ", sql); var asOf = DateTime.Today; //(?: )+ means repeat the inner groups var regexExpr = @" (?:{@(?<parameter>\w+)(?<operation>\S)?(?<number>\d+)?})+ "; var regex = new Regex(regexExpr); foreach (Match match in regex.Matches(sql)) { sql = sql.Replace(match.Value, Substitute(match.Value, asOf)); } Console.WriteLine(" AFTER : {0} ", sql); } private string Substitute( string parameterText, DateTime asOf) { var regexExpr = @" {@(?<parameter>\w+)(?<operation>\S)?(?<number>\d+)?} "; var regex = new Regex(regexExpr); var match = regex.Match(parameterText); if (match.Success) { var parameter = match.Groups[" parameter "].Value; if (match.Groups[" operation "].Success &&a

PRINT ' CREATE TABLE ' GO IF EXISTS ( SELECT * FROM dbo.sysobjects where id = object_id(N' [Table1] ') and OBJECTPROPERTY(id, N' IsUserTable ') = 1) DROP TABLE [ Table 1] GO CREATE TABLE [dbo].[ Table 1]( [Id] [ uniqueidentifier ] NOT NULL , [Name] [ varchar ](50) NULL , [DateUpdated] [ datetime ] NULL , CONSTRAINT [PK_Table1] PRIMARY KEY CLUSTERED ( [Id] ) ) GO GRANT SELECT , INSERT , UPDATE , DELETE ON [ Table 1] TO [SampleUser] GO PRINT ' CREATE STORED PROCEDURE ' GO IF EXISTS ( SELECT * FROM dbo.sysobjects where id = object_id(N' [StoredProcedure1] ') and OBJECTPROPERTY(id, N' IsProcedure ') = 1) DROP PROCEDURE [dbo].[StoredProcedure1] GO CREATE PROCEDURE [dbo].[StoredProcedure1] AS SET NOCOUNT ON UPDATE dbo. Table 1 SET [DateUpdated]=GETDATE() GO GRANT EXECUTE ON [StoredProcedure1] TO [SampleUser] GO PRINT ' CREATE VIEW ' GO

This is an example how to recreate non serialized member of the class on deserialization. class TestSerialization { [Test] public void Test() { var parent = new Parent(2,3); // serialize byte [] data = SerializationHelper.Serialize(parent); // deserialize var parentCopy = SerializationHelper.Deserialize(data) as Parent; Assert.AreEqual(2, parentCopy.Value1); //confirm that constructor is not called on deserialization Assert.AreEqual(6, parentCopy.Value2); } [Serializable] class Parent { public Parent( int value 1, int value 2) { _value1 = value 1; _value2 = value 2 * 2; //Child object is not serialized, so needs to be recreated on deserialization (see below) _child = new Child() { Value1 = _value1, Value2 = _value2 }; } private int _value1; private int _value2; [NonSerialized] private Child _child; public int Value1 { get { return _child.Value1; } }

This is useful if you want to select a lot of data by key and writing IN statement is not efficient (too much data etc..). You load the keys to temp table and then select data using a join. CREATE TABLE [dbo].[Table_1]( [Id] [ int ] NOT NULL , [Name] [ varchar ](50) NULL ) [TestFixture] public class TestSelectWithTempTableJoin { [Test] public void Test() { const string nbTempCreate = @" CREATE TABLE #Ids( Id INT ) "; const string nbTempDrop = @" DROP TABLE #Ids "; const string query = @" SELECT * FROM Table_1 t JOIN #Ids temp ON t.Id = temp.Id "; var ids = new List< int >( new int []{1,3,4}); var rows = new List<KeyValuePair< int , string >>(); var sqlConnectionStringBuilder = new SqlConnectionStringBuilder(); sqlConnectionStringBuilder.DataSource = " (local) "; sqlConnectionStringBuilder.InitialCatalog =

* Add reference to System.DirectoryServices static string GetMail( string user) { using (var connection = new DirectoryEntry()) { using (var search = new DirectorySearcher(connection) { Filter = " (samaccountname= " + user + " ) ", PropertiesToLoad = {" mail "}, }) { return ( string ) search.FindOne().Properties[" mail "][0]; } } }