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C# Dictionaryのkeyとvalueを連結する

Last updated at Posted at 2019-01-29

やりたいこと

Dictionaryの例
// サンプルデータ
var profile = new Dictionary<string, string>() {
	{"name", "お名前"},
	{"age", "30歳"},
	{"address", "日本"},
	{"blood", "AB型"},
};

という Dictionary を、以下のように keyとvalueを :で連結し、さらにそれらを 改行コード\n で連結する。
結果として、以下のような出力をしたい。

結果
name : お名前
age : 30歳
address : 日本
blood : AB型

やり方

以下のように、 String.Json と LinqのSelect で ワンライナーで実装する

実装
// サンプルデータ
var profile = new Dictionary<string, string>() {
	{"name", "お名前"},
	{"age", "20歳"},
	{"address", "日本"},
	{"blood", "AB型"},
};

var result = String.Join("\n", profile.Select(kvp => kvp.Key + " : " + kvp.Value));
Debug.Log(result);

おまけ:拡張メソッド

よく使われそうなので拡張メソッドにする

拡張メソッド実装
public static class DictionaryExtensions {

	public static string ToJoin<TKey, TValue>(
		this IDictionary<TKey, TValue> source, string separator, string join) 
	{
		return string.Join(separator, source.Select(kvp => kvp.Key.ToString()+join+kvp.Value.ToString()));
	}
}
使用例
// サンプルデータ
var profile = new Dictionary<string, string>() {
	{"name", "お名前"},
	{"age", "20歳"},
	{"address", "日本"},
	{"blood", "AB型"},
};

var result = profile.ToJoin("\n", " : ");
Debug.Log(result);

参考

How to use Aggregate method of Dictionary<> in C#?

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