{"id":52,"date":"2013-10-02T17:46:00","date_gmt":"2013-10-02T22:46:00","guid":{"rendered":"https:\/\/www.chrystalsander.com\/blog\/?p=52"},"modified":"2023-07-26T15:58:27","modified_gmt":"2023-07-26T20:58:27","slug":"linq-use-with-lambdas","status":"publish","type":"post","link":"https:\/\/www.chrystalsander.com\/blog\/?p=52","title":{"rendered":"LINQ : Use With Lambdas"},"content":{"rendered":"
\nThe two examples below show two LINQ
\nqueries utilizing Lambdas:<\/div>\n
\n<\/div>\n
\n
\n\/\/First,
\ncreate  two  classes  that  we  will 
\nuse  later<\/span><\/span><\/span><\/div>\n
\npublic<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>class<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>Rider<\/span><\/span><\/span><\/div>\n
\n{<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>public<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>string<\/span><\/span><\/span> 
\nname;<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>public<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>int<\/span><\/span><\/span> 
\nnumber;<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>public<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>override<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>string<\/span><\/span><\/span> 
\nToString()<\/span><\/span><\/span><\/div>\n
\n 
\n      {<\/span><\/span><\/span><\/div>\n
\n 
\n              <\/span>return<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>this<\/span><\/span><\/span>.name;<\/span><\/span><\/span><\/div>\n
\n 
\n      }<\/span><\/span><\/span><\/div>\n

<\/p>\n

\n}<\/span><\/span><\/span><\/div>\n
\n
<\/span><\/span><\/span><\/div>\n
\npublic<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>class<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>Team<\/span><\/span><\/span><\/div>\n
\n{<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>public<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>string<\/span><\/span><\/span> 
\nteamName;<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>public<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>int<\/span><\/span><\/span> 
\nnumber;<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>public<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>override<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>string<\/span><\/span><\/span> 
\nToString()<\/span><\/span><\/span><\/div>\n
\n 
\n      {<\/span><\/span><\/span><\/div>\n
\n 
\n              <\/span>return<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>this<\/span><\/span><\/span>.teamName;<\/span><\/span><\/span><\/div>\n
\n 
\n      }<\/span><\/span><\/span><\/div>\n
\n<\/div>\n
\n}<\/span><\/span><\/span><\/div>\n
\n
<\/span><\/span><\/span><\/div>\n
\n\/\/Second,
\nadd some data for the purpose of this example<\/span><\/span><\/span><\/div>\n
\n\/\/utility 
\nmethod  to  populate  list<\/span><\/span><\/span><\/div>\n
\npublic<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>static<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Rider<\/span><\/span><\/span>> 
\ncreateRider()<\/span><\/span><\/span><\/div>\n
\n{<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Rider<\/span><\/span><\/span>> 
\nrl  =  <\/span><\/span><\/span>new<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Rider<\/span><\/span><\/span>>();<\/span><\/span><\/span><\/div>\n
\n
\n<\/span>\n<\/div>\n
\n 
\n      <\/span>Rider<\/span><\/span><\/span> 
\nr  =  <\/span><\/span><\/span>new<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>Rider<\/span><\/span><\/span>();<\/span><\/span><\/span><\/div>\n
\n 
\n      r.name 
\n=  <\/span><\/span><\/span>“JorgeLorenzo”<\/span><\/span><\/span>;<\/span><\/span><\/span><\/div>\n
\n 
\n      r.number 
\n=  99;<\/span><\/span><\/span><\/div>\n
\n 
\n      rl.Add(r);<\/span><\/span><\/span><\/div>\n
\n 
\n      r 
\n=  <\/span><\/span><\/span>new<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>Rider<\/span><\/span><\/span>();<\/span><\/span><\/span><\/div>\n
\n 
\n      r.name 
\n=  <\/span><\/span><\/span>“ValentinoRossi”<\/span><\/span><\/span>;<\/span><\/span><\/span><\/div>\n
\n 
\n      r.number 
\n=  46;<\/span><\/span><\/span><\/div>\n
\n 
\n      rl.Add(r);<\/span><\/span><\/span><\/div>\n
\n
\n<\/span>\n<\/div>\n
\n 
\n      <\/span>return<\/span><\/span><\/span> 
\nrl;            <\/span><\/span><\/span>\n<\/div>\n
\n}<\/span><\/span><\/span><\/div>\n
\n
\n<\/span>\n<\/div>\n
\n\/\/utility 
\nmethod  to  populate  list<\/span><\/span><\/span><\/div>\n
\npublic<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>static<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Team<\/span><\/span><\/span>> 
\ncreateTeam()<\/span><\/span><\/span><\/div>\n
\n{<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Team<\/span><\/span><\/span>> 
\ntl  =  <\/span><\/span><\/span>new<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Team<\/span><\/span><\/span>>();<\/span><\/span><\/span><\/div>\n
\n
\n<\/span>\n<\/div>\n
\n 
\n      <\/span>Team<\/span><\/span><\/span> 
\nt  =  <\/span><\/span><\/span>new<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>Team<\/span><\/span><\/span>();<\/span><\/span><\/span><\/div>\n
\n 
\n      t.teamName 
\n=  <\/span><\/span><\/span>“Yamaha”<\/span><\/span><\/span>;<\/span><\/span><\/span><\/div>\n
\n 
\n      t.number 
\n=  99;<\/span><\/span><\/span><\/div>\n
\n 
\n      tl.Add(t);<\/span><\/span><\/span><\/div>\n
\n 
\n      t 
\n=  <\/span><\/span><\/span>new<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>Team<\/span><\/span><\/span>();<\/span><\/span><\/span><\/div>\n
\n 
\n      t.teamName 
\n=  <\/span><\/span><\/span>“Yamaha”<\/span><\/span><\/span>;<\/span><\/span><\/span><\/div>\n
\n 
\n      t.number 
\n=  46;<\/span><\/span><\/span><\/div>\n
\n 
\n      tl.Add(t);<\/span><\/span><\/span><\/div>\n
\n 
\n      t 
\n=  <\/span><\/span><\/span>new<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>Team<\/span><\/span><\/span>();<\/span><\/span><\/span><\/div>\n
\n 
\n      t.teamName 
\n=  <\/span><\/span><\/span>“Ducati”<\/span><\/span><\/span>;<\/span><\/span><\/span><\/div>\n
\n 
\n      t.number 
\n=  69;<\/span><\/span><\/span><\/div>\n
\n 
\n      tl.Add(t);<\/span><\/span><\/span><\/div>\n
\n
\n<\/span>\n<\/div>\n
\n 
\n      <\/span>return<\/span><\/span><\/span> 
\ntl;<\/span><\/span><\/span><\/div>\n
\n}<\/span><\/span><\/span><\/div>\n
\n<\/div>\n
\n\n<\/div>\n
\n\/\/Now,
\nuse  Linq  query  with  a  Lambda 
\nexpression  to  list  riders<\/span><\/span><\/span><\/div>\n
\npublic<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>static<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>void<\/span><\/span><\/span> 
\nlinqLambdaRiders()<\/span><\/span><\/span><\/div>\n
\n{<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Rider<\/span><\/span><\/span>> 
\nriders  =  createRider();         
\n            <\/span><\/span><\/span>\n<\/div>\n
\n 
\n                   
\n  <\/span>\n<\/div>\n
\n 
\n      <\/span>var<\/span><\/span><\/span> 
\nlinqQuery  =  riders.Select<<\/span><\/span><\/span>Rider<\/span><\/span><\/span>, 
\n<\/span><\/span><\/span>string<\/span><\/span><\/span>>(r 
\n=>  r.name);<\/span><\/span><\/span><\/div>\n
\n
\n<\/span>\n<\/div>\n
\n 
\n      <\/span>foreach<\/span><\/span><\/span> 
\n(<\/span><\/span><\/span>var<\/span><\/span><\/span> 
\nn  <\/span><\/span><\/span>in<\/span><\/span><\/span> 
\nlinqQuery)<\/span><\/span><\/span><\/div>\n
\n 
\n      {<\/span><\/span><\/span><\/div>\n
\n 
\n             
\n<\/span>Console<\/span><\/span><\/span>.WriteLine(n);<\/span><\/span><\/span><\/div>\n
\n 
\n      }<\/span><\/span><\/span><\/div>\n
\n 
\n      <\/span>Console<\/span><\/span><\/span>.ReadLine();<\/span><\/span><\/span><\/div>\n
\n<\/div>\n
\n}<\/span><\/span><\/span><\/div>\n
\n
<\/span><\/span><\/span><\/div>\n
\nEXAMPLE
\n#1<\/b><\/span><\/span><\/span><\/div>\n
\n\/\/Use 
\nLinq  query  with  a  Lambda  expression 
\nto  list  riders<\/span><\/span><\/span><\/div>\n
\npublic<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>static<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>void<\/span><\/span><\/span> 
\nlinqLambdaRiders()<\/span><\/span><\/span><\/div>\n
\n{<\/span><\/span><\/span><\/div>\n
\n        <\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Rider<\/span><\/span><\/span>> 
\nriders  =  createRider();         
\n            <\/span><\/span><\/span>\n<\/div>\n
\n             
\n          <\/span>\n<\/div>\n
\n        <\/span>var<\/span><\/span><\/span> 
\nlinqQuery  =  riders.Select<<\/span><\/span><\/span>Rider<\/span><\/span><\/span>, 
\n<\/span><\/span><\/span>string<\/span><\/span><\/span>>(r 
\n=>  r.name);<\/span><\/span><\/span><\/div>\n
\n <\/span>\n<\/div>\n
\n        <\/span>foreach<\/span><\/span><\/span> 
\n(<\/span><\/span><\/span>var<\/span><\/span><\/span> 
\nn  <\/span><\/span><\/span>in<\/span><\/span><\/span> 
\nlinqQuery)<\/span><\/span><\/span><\/div>\n
\n        {<\/span><\/span><\/span><\/div>\n
\n             
\n  <\/span>Console<\/span><\/span><\/span>.WriteLine(<\/span><\/span><\/span>“Rider: 
\n{0}”<\/span><\/span><\/span>, 
\nn);<\/span><\/span><\/span><\/div>\n
\n        }<\/span><\/span><\/span><\/div>\n
\n        <\/span>Console<\/span><\/span><\/span>.ReadLine();<\/span><\/span><\/span><\/div>\n
\n}<\/span><\/span><\/span><\/div>\n
\n\n<\/div>\n
\n RESULT #1:<\/b><\/span><\/span><\/span><\/div>\n
\n
<\/b><\/span><\/span><\/span><\/div>\n
\n<\/a><\/div>\n
\n<\/div>\n
\n\n<\/div>\n
\nEXAMPLE
\n#2<\/b><\/span><\/span><\/span><\/div>\n
\n
<\/b><\/span><\/span><\/span><\/div>\n
\n\/\/Use 
\njoins  in  a  Linq  query  using  a 
\nLambda  to  query  for  specific  riders<\/span><\/span><\/span><\/div>\n
\npublic<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>static<\/span><\/span><\/span> 
\n<\/span><\/span><\/span>void<\/span><\/span><\/span> 
\nlinqLambdaRiderTeams()<\/span><\/span><\/span><\/div>\n
\n{<\/span><\/span><\/span><\/div>\n
\n        <\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Rider<\/span><\/span><\/span>> 
\nriders  =  createRider();<\/span><\/span><\/span><\/div>\n
\n        <\/span>List<\/span><\/span><\/span><<\/span><\/span><\/span>Team<\/span><\/span><\/span>> 
\nteam  =  createTeam();<\/span><\/span><\/span><\/div>\n
\n <\/span>\n<\/div>\n
\n        <\/span>\/\/<\/span><\/span><\/span><\/div>\n
\n        <\/span>var<\/span><\/span><\/span> 
\nlinqQuery  =  riders.Join<<\/span><\/span><\/span>Rider<\/span><\/span><\/span>, 
\n<\/span><\/span><\/span>Team<\/span><\/span><\/span>, 
\n<\/span><\/span><\/span>int<\/span><\/span><\/span>, 
\n<\/span><\/span><\/span>Rider<\/span><\/span><\/span>><\/span><\/span><\/span><\/div>\n
\n             
\n  (team, 
\nr1  =>  r1.number,  t  =>  t.number, 
\n(t,  r2)  =>  t);<\/span><\/span><\/span><\/div>\n
\n <\/span>\n<\/div>\n
\n        <\/span>foreach<\/span><\/span><\/span> 
\n(<\/span><\/span><\/span>var<\/span><\/span><\/span> 
\nr  <\/span><\/span><\/span>in<\/span><\/span><\/span> 
\nlinqQuery)<\/span><\/span><\/span><\/div>\n
\n        {<\/span><\/span><\/span><\/div>\n
\n             
\n  <\/span>Console<\/span><\/span><\/span>.WriteLine(<\/span><\/span><\/span>“Rider 
\nin  teams  with  matching  number  is 
\n#{0},    {1}”<\/span><\/span><\/span>, 
\nr.number,  r.name);<\/span><\/span><\/span><\/div>\n
\n        }<\/span><\/span><\/span><\/div>\n
\n        <\/span>Console<\/span><\/span><\/span>.ReadLine();<\/span><\/span><\/span><\/div>\n
\n}<\/span><\/span><\/span><\/div>\n
\n
<\/span><\/span><\/span><\/div>\n
\nRESULT #2 (<\/b><\/span><\/span><\/span>Note
\nthat Rider #69 is excluded due to the join criteria<\/b><\/i><\/span><\/span><\/span>):<\/b><\/span><\/span><\/span><\/div>\n
\n<\/div>\n
\n<\/div>\n
\n<\/a><\/div>\n
\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

The two examples below show two LINQ queries utilizing Lambdas: \/\/First, create  two  classes  that  we  will  use  later public  class  Rider {         public  string  name;         public  int  number;         public  override  string  ToString()         {           … Continue reading “LINQ : Use With Lambdas”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,33],"tags":[83],"_links":{"self":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/52"}],"collection":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=52"}],"version-history":[{"count":1,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions"}],"predecessor-version":[{"id":241,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions\/241"}],"wp:attachment":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}