C# How to create a generic List of KeyValuePair

Question

I have created a list of KeyValuePair to populate the content as the data for the HttpClient.

List<KeyValuePair<string, string>> keyValues = new List<KeyValuePair<string, string>>();

keyValues.Add(new KeyValuePair<string, string>("email", email));
keyValues.Add(new KeyValuePair<string, string>("password", password));
keyValues.Add(new KeyValuePair<string, string>("plan_id", planId));

var content = new FormUrlEncodedContent(keyValues);

But later I found I have to send a int value as the plan_id. How can change the above list to accept KeyValuePair. Or is there any better way to do this?

Ultimately everything in HTTP is sent as an ASCII string, so why not just call `planId.ToString(CultureInfo.InvariantCulture)`? — Dai, Apr 21 '15 at 02:52
I am calling an external API. When I send a string value for the plan id I am getting a Bad Request. But with a int value it is getting success. — Yasitha, Apr 21 '15 at 02:56
Is it possible to create generic list as follow in java. List> keyValues = new List>(); — Yasitha, Apr 21 '15 at 02:59
Well `FormUrlEncodedContent` will only accept an `IEnumerable> nameValueCollection` so unless you encode your content differently that's what you will have to do and as @Dai mentioned, convert your integer to its string representation. — Alex, Apr 21 '15 at 03:03

score 4 · Answer 1 · answered Apr 21 '15 at 02:56

4

If you want to create a KeyValuePair list, you should create Dictionary.

Dictionary<string, string> dic = new Dictionary<string,string>();
dic.Add("email", email);
dic.Add("password", password);
dic.Add("plan_id", planId.ToString());

answered Apr 21 '15 at 02:56

Black Frog

11,595
1
35
66

Here what need to create is something like this. Like generic ArrayList in java. List> keyValues = new List>(); – Yasitha Apr 21 '15 at 02:58
1

This solution does not allow duplicates! – Flimtix May 25 '22 at 09:50

score 4 · Answer 2 · answered Mar 14 '19 at 13:26

Use KeyValuePair<string, object> to put values and create or convert the list to KeyValuePair<string, string> when to use FormUrlEncodedContent

Creating a new list

List<KeyValuePair<string, object>> keyValues = new List<KeyValuePair<string, object>>();

keyValues.Add(new KeyValuePair<string, object>("email", "asdasd"));
keyValues.Add(new KeyValuePair<string, object>("password", "1131"));
keyValues.Add(new KeyValuePair<string, object>("plan_id", 123));
keyValues.Add(new KeyValuePair<string, object>("other_field", null));

var content = new FormUrlEncodedContent(keyValues.Select(s => 
    new KeyValuePair<string, string>(s.Key, s.Value != null ? s.ToString() : null)
));

Convert list

public static KeyValuePair<string, string> ConvertRules(KeyValuePair<string, object> kv)
{
    return new KeyValuePair<string, string>(kv.Key, kv.Value != null ? kv.ToString() : null);
}

static Task Main(string[] args) 
{
    List<KeyValuePair<string, object>> keyValues = new List<KeyValuePair<string, object>>();

    keyValues.Add(new KeyValuePair<string, object>("email", "asdasd"));
    keyValues.Add(new KeyValuePair<string, object>("password", "1131"));
    keyValues.Add(new KeyValuePair<string, object>("plan_id", 123));
    keyValues.Add(new KeyValuePair<string, object>("other_field", null));

    var content = new FormUrlEncodedContent(keyValues.ConvertAll(ConvertRules)));
));

score 0 · Answer 3 · answered Apr 21 '15 at 03:01

0

Don't use List<KeyValuePair<string,string>>, instead of Dictionary<string, string>. use planId.ToString().

answered Apr 21 '15 at 03:01

zhangyiying

414
4
15

C# How to create a generic List of KeyValuePair

3 Answers3

Creating a new list

Convert list