List of tuples to list of first elements in that list of tuple C#

up vote
0
down vote

favorite

In Dictionary I can get a list of its Key/Values like in the below code:

    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);

Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:

        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";

asked Nov 10 at 15:14

Ahmed Salah

1691213

4

Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
– Klaus Gütter
Nov 10 at 15:17

2

There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
– 2kay
Nov 10 at 15:20

Thank you guys!
– Ahmed Salah
Nov 10 at 15:26

1

In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
– 2kay
Nov 10 at 15:27

add a comment |

up vote
0
down vote

favorite

In Dictionary I can get a list of its Key/Values like in the below code:

    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);

Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:

        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";

asked Nov 10 at 15:14

Ahmed Salah

1691213

4

Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
– Klaus Gütter
Nov 10 at 15:17

2

There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
– 2kay
Nov 10 at 15:20

Thank you guys!
– Ahmed Salah
Nov 10 at 15:26

1

In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
– 2kay
Nov 10 at 15:27

add a comment |

up vote
0
down vote

favorite

In Dictionary I can get a list of its Key/Values like in the below code:

    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);

Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:

        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";

asked Nov 10 at 15:14

Ahmed Salah

1691213

In Dictionary I can get a list of its Key/Values like in the below code:

    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);

Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:

        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";

asked Nov 10 at 15:14

Ahmed Salah

1691213

asked Nov 10 at 15:14

Ahmed Salah

1691213

asked Nov 10 at 15:14

Ahmed Salah

1691213

asked Nov 10 at 15:14

Ahmed Salah

1691213

asked Nov 10 at 15:14

Ahmed Salah

1691213

4

Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
– Klaus Gütter
Nov 10 at 15:17

2

There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
– 2kay
Nov 10 at 15:20

Thank you guys!
– Ahmed Salah
Nov 10 at 15:26

1

In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
– 2kay
Nov 10 at 15:27

add a comment |

4

Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
– Klaus Gütter
Nov 10 at 15:17

2

There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
– 2kay
Nov 10 at 15:20

Thank you guys!
– Ahmed Salah
Nov 10 at 15:26

1

In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
– 2kay
Nov 10 at 15:27

Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
– Klaus Gütter
Nov 10 at 15:17

There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
– 2kay
Nov 10 at 15:20

Thank you guys!
– Ahmed Salah
Nov 10 at 15:26

In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
– 2kay
Nov 10 at 15:27

add a comment |

1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:

list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();

answered Nov 10 at 15:46

Ahmed Salah

1691213

add a comment |

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53240305%2flist-of-tuples-to-list-of-first-elements-in-that-list-of-tuple-c-sharp%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:

list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();

answered Nov 10 at 15:46

Ahmed Salah

1691213

add a comment |

up vote
1
down vote

accepted

As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:

list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();

answered Nov 10 at 15:46

Ahmed Salah

1691213

add a comment |

up vote
1
down vote

accepted

As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:

list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();

answered Nov 10 at 15:46

Ahmed Salah

1691213

As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:

list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();

answered Nov 10 at 15:46

Ahmed Salah

1691213

answered Nov 10 at 15:46

Ahmed Salah

1691213

answered Nov 10 at 15:46

Ahmed Salah

1691213

answered Nov 10 at 15:46

Ahmed Salah

1691213

add a comment |

draft saved

draft discarded

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Ndtyjky