DECLARE @TagNames XML;SET @TagNames = '<?xml version="1.0" encoding="utf-8"?><ArrayOfString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><string>asp.net</string><string>sql</string><string>ajax</string></ArrayOfString>';DECLARE @TagNameTable TABLE([IndexId] INT IDENTITY(1,1) NOT NULL PRIMARY KEY, [TagName] NVARCHAR(200) NOT NULL) INSERT INTO @TagNameTable SELECT tab.col.value('text()[1]','nvarchar(200)') AS [TagName] FROM @TagNames.nodes('/ArrayOfString/string') AS tab(col);select * from @TagNameTable order by [IndexId]<head> <base target="_blank" /></head> static void Main(string[] args)
{
var strs = new List<string> { "A1", "A2", "A3" };
var strs 
List<string> list = new List<string>(); //使用匿名委托 strs.ForEach(delegate(string str) { Console.WriteLine(str); }); //使用Lambda表达式 strs.ForEach(x => list.Add(x.TrimStart('A'))); list.ForEach(x => Console.WriteLine(x)); Console.ReadLine();
}5、如何成功调用wsHttpBinding邦定的WCF服务?
服务器定义了dns，如：
<system.serviceModel> <services> <service behaviorConfiguration="passportServiceBehavior" name="CJB.Passport.Service.PassportService"> <endpoint address="" binding="wsHttpBinding" contract="CJB.Passport.Contract.IPassportService"> <identity> <dns value="localhost" /> </identity> </endpoint> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> </services> <behaviors> <serviceBehaviors> <behavior name="passportServiceBehavior"> <serviceMetadata httpGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="true" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> <system.serviceModel> <client> <endpoint address="http://passport2.ruiya.com/WcfService/PassportService.svc" binding="wsHttpBinding" bindingConfiguration="" contract="CJB.Passport.Contract.IPassportService" name="iisHostEndpoint"> <identity> <dns value="cjb"/> </identity> </endpoint> </client> </system.serviceModel>6、注意between ... and ...在使用变量和使用拼接字符串中不过的执行计划导致的性能问题：
declare @handleTime datetime; declare @beginTime datetime; declare @endTime datetime; set @handleTime = DateAdd(day, -1, getdate()); set @beginTime = CONVERT(datetime, CONVERT(char(10), @handleTime, 120)); set @endTime = DateAdd(day, 1, @beginTime); declare @sql nvarchar(1000); set @sql = 'SELECT * FROM [UserPosts] WITH(NOLOCK) WHERE ([AddTime] between ''' + cast(@beginTime as nvarchar(100)) + ''' AND ''' + cast(@endTime as nvarchar(100)) + ''')'; --print @sql declare @st datetime declare @et datetime set @st = getdate(); exec(@sql); set @et = getdate(); select datediff(millisecond, @st, @et); set @st = getdate(); select * from [UserPosts] WITH(NOLOCK) WHERE ([AddTime] between @beginTime and @endTime); set @et = getdate(); select datediff(millisecond, @st, @et);使用变量：23106ms
7、SQL拆分字符串
CREATE PROCEDURE [dbo].[ec_System_SplitString] @strs nvarchar(4000), @separator nchar(1)=','ASBEGIN SET NOCOUNT ON; DECLARE @tbNames table([Name] nvarchar(256) NOT NULL PRIMARY KEY) DECLARE @Num int; DECLARE @Pos int; DECLARE @NextPos int; DECLARE @Name nvarchar(256); SET @Num = 0; SET @Pos = 1; WHILE(@Pos <= LEN(@strs)) BEGIN SELECT @NextPos = CHARINDEX(@separator, @strs, @Pos) IF (@NextPos = 0 OR @NextPos IS NULL) SELECT @NextPos = LEN(@strs) + 1 SELECT @Name = RTRIM(LTRIM(SUBSTRING(@strs, @Pos, @NextPos - @Pos))) SELECT @Pos = @NextPos+1 INSERT INTO @tbNames VALUES (@Name) SET @Num = @Num + 1 END SELECT [Name] FROM @tbNamesEND