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「Unity/Csharp/linq」の版間の差分

提供: 初心者エンジニアの簡易メモ
移動: 案内検索
(条件一行だけ(fetchRow))
(条件複数行でソート(fetchAll))
 
(同じ利用者による、間の17版が非表示)
行52: 行52:
 
     return scores.FirstOrDefault(score => score.yyyymmdd == yyyymmdd);
 
     return scores.FirstOrDefault(score => score.yyyymmdd == yyyymmdd);
 
}
 
}
検索にひっかからないとnullが帰ってくる
+
// 検索にひっかからないとnullが帰ってくる
 
ScoreDay score = dao.FindRowByYyyymmdd("201903");
 
ScoreDay score = dao.FindRowByYyyymmdd("201903");
 
if (score == null) return;
 
if (score == null) return;
行63: 行63:
 
     List<ScoreDay> scores = FindAll();
 
     List<ScoreDay> scores = FindAll();
 
     return scores.Where(score => score.yyyymmdd == yyyymmdd);
 
     return scores.Where(score => score.yyyymmdd == yyyymmdd);
 +
}
 +
</pre>
 +
 +
==条件複数行でソート(fetchAll)==
 +
<pre>
 +
public IOrderedEnumerable <ScoreDay> FindAllByYyyymmdd(string yyyymmdd)
 +
{
 +
    List<ScoreDay> scores = FindAll();
 +
    return scores.Where(score => score.yyyymmdd == yyyymmdd).OrderByDescending( value => value.age);
 +
}
 +
</pre>
 +
 +
==条件を複数指定==
 +
<pre>
 +
public IOrderedEnumerable <ScoreDay> FindAllByYyyymmdd(string yyyymmdd, string cate)
 +
{
 +
    List<ScoreDay> scores = FindAll();
 +
    return scores.Where(score => score.yyyymmdd == yyyymmdd).Where(score => score.cate.Equals(cate));
 
}
 
}
 
</pre>
 
</pre>
行69: 行87:
 
<pre>
 
<pre>
 
// 年下順
 
// 年下順
IOrderedEnumerable<User>   orderedUsers   = users.OrderBy( value => value.age );
+
IOrderedEnumerable<User> orderedUsers = users.OrderBy(value => value.age);
 
// 年上順
 
// 年上順
IOrderedEnumerable<User>   orderedDescUsers   = users.OrderByDescending( value => value.age );
+
IOrderedEnumerable<User> orderedDescUsers = users.OrderByDescending(value => value.age);
 
foreach (User user in orderedUsers) {
 
foreach (User user in orderedUsers) {
 
     Debug.Log(user.name);
 
     Debug.Log(user.name);
行79: 行97:
 
参考:https://doruby.jp/users/ino/entries/%E3%80%90C--Unity%E3%80%91LINQ%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E3%81%BF%E3%81%9F%E3%82%89%E3%81%A8%E3%81%A6%E3%82%82%E3%82%B9%E3%83%9E%E3%83%BC%E3%83%88%E3%81%A0%E3%81%A3%E3%81%9F
 
参考:https://doruby.jp/users/ino/entries/%E3%80%90C--Unity%E3%80%91LINQ%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E3%81%BF%E3%81%9F%E3%82%89%E3%81%A8%E3%81%A6%E3%82%82%E3%82%B9%E3%83%9E%E3%83%BC%E3%83%88%E3%81%A0%E3%81%A3%E3%81%9F
  
==取得件数を絞る==
+
==取得件数(limit)を絞る==
 
  List<Score> scores = new List<Score>();
 
  List<Score> scores = new List<Score>();
 
  IEnumerable<Score> tmpScores = scores.Skip(0).Take(100);
 
  IEnumerable<Score> tmpScores = scores.Skip(0).Take(100);
行87: 行105:
 
  IEnumerable<Score> tmpScores = scores.Where(score => score.sec > 6);
 
  IEnumerable<Score> tmpScores = scores.Where(score => score.sec > 6);
 
  List<Score> scores = tmpScores.ToList();
 
  List<Score> scores = tmpScores.ToList();
 +
 +
 +
==条件に引っかからなかった時==
 +
List<ScoreDay> scores = FindAll();
 +
IEnumerable<Score> tmpScores = scores.Where(score => score.sec > 6);
 +
if (!tmpScores.Any()) {
 +
    return 0;
 +
}
  
 
==IEnumerableをListへ変換==
 
==IEnumerableをListへ変換==
行112: 行138:
 
  List<Score> scores = FindAll();
 
  List<Score> scores = FindAll();
 
  IEnumerable<Score> scores = scores.Where(record => record.yyyymmdd.EndsWith("0316"));
 
  IEnumerable<Score> scores = scores.Where(record => record.yyyymmdd.EndsWith("0316"));
 +
 +
==GroupByを使う場合==
 +
件数をkeyにgroupbyを行った場合
 +
<pre>
 +
public IEnumerable<IGrouping<int ,User>>FindAllGroupByIdOrderByCntDesc()
 +
{
 +
  List<User> users = FindAll();
 +
  return users
 +
      .GroupBy(value => value.id)
 +
    .OrderByDescending(value => value.Count());
 +
}
 +
 +
List<IGrouping<int, User>> groups = FindAllGroupByIdOrderByCntDesc.FindAllGroupByIdOrderByCntDesc().ToList();
 +
if (groups != null && groups.Count > 0)
 +
{
 +
    foreach (IGrouping<int, User> users in groups)
 +
    {
 +
        Debug.Log("key=" + users.Key);
 +
        User user = new User();
 +
        foreach (User tmpUser in users)
 +
        {
 +
            user = tmpUser;
 +
        }
 +
        if (users.Count() == 0)
 +
        {
 +
            continue;
 +
        }
 +
        Debug.Log(user.name);
 +
    }
 +
}
 +
</pre>
 +
参考:https://www.sejuku.net/blog/47220
 +
 +
==最大値最小値==
 +
<pre>
 +
int ageMax = ages.Max();
 +
int ageMin = ages.Min();
 +
</pre>
 +
 +
==条件に当てはまる件数を取得==
 +
tmpScores.Where(n => n.point > 0).Count();
 +
pointが0以上であるものの件数

2022年8月5日 (金) 04:23時点における最新版

準備

using System.Linq;

配列データの用意

users

User.cs

[Serializable]
public class User
{
    [SerializeField]
    public int age;
    [SerializeField]
    public string name;
}

List<User> users = new List<User>();
users.Add(new User() { age = 10, name = "taro" });
users.Add(new User() { age = 13, name = "jiro" });
users.Add(new User() { age = 12, name = "saburo" });
users.Add(new User() { age = 15, name = "siro" });

scores

Score.cs
[Serializable]
public class Score 
{
    [SerializeField]
    public string yyyymmdd;
    [SerializeField]
    public int missCnt;
    [SerializeField]
    public int finishCnt;
}

List<Score> scores = new List<Score>();
scores.Add(new Score() { yyyymmdd = "20190316", missCnt = 10, finishCnt = 1 });
scores.Add(new Score() { yyyymmdd = "20190315", missCnt = 13, finishCnt = 2 });
scores.Add(new Score() { yyyymmdd = "20190314", missCnt = 12, finishCnt = 3 });
scores.Add(new Score() { yyyymmdd = "20190313", missCnt = 15, finishCnt = 4 });

条件一行だけ(fetchRow)

public ScoreDay FindRowByYyyymmdd(string yyyymmdd)
{
    List<ScoreDay> scores = FindAll();
    return scores.FirstOrDefault(score => score.yyyymmdd == yyyymmdd);
}
// 検索にひっかからないとnullが帰ってくる
ScoreDay score = dao.FindRowByYyyymmdd("201903");
if (score == null) return;

条件複数行(fetchAll)

public IEnumerable<ScoreDay> FindAllByYyyymmdd(string yyyymmdd)
{
    List<ScoreDay> scores = FindAll();
    return scores.Where(score => score.yyyymmdd == yyyymmdd);
}

条件複数行でソート(fetchAll)

public IOrderedEnumerable <ScoreDay> FindAllByYyyymmdd(string yyyymmdd)
{
    List<ScoreDay> scores = FindAll();
    return scores.Where(score => score.yyyymmdd == yyyymmdd).OrderByDescending( value => value.age);
}

条件を複数指定

public IOrderedEnumerable <ScoreDay> FindAllByYyyymmdd(string yyyymmdd, string cate)
{
    List<ScoreDay> scores = FindAll();
    return scores.Where(score => score.yyyymmdd == yyyymmdd).Where(score => score.cate.Equals(cate));
}

順序

// 年下順
IOrderedEnumerable<User> orderedUsers = users.OrderBy(value => value.age);
// 年上順
IOrderedEnumerable<User> orderedDescUsers = users.OrderByDescending(value => value.age);
foreach (User user in orderedUsers) {
    Debug.Log(user.name);
}

参考:https://doruby.jp/users/ino/entries/%E3%80%90C--Unity%E3%80%91LINQ%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E3%81%BF%E3%81%9F%E3%82%89%E3%81%A8%E3%81%A6%E3%82%82%E3%82%B9%E3%83%9E%E3%83%BC%E3%83%88%E3%81%A0%E3%81%A3%E3%81%9F

取得件数(limit)を絞る

List<Score> scores = new List<Score>();
IEnumerable<Score> tmpScores = scores.Skip(0).Take(100);

指定条件だけに絞る

List<ScoreDay> scores = FindAll();
IEnumerable<Score> tmpScores = scores.Where(score => score.sec > 6);
List<Score> scores = tmpScores.ToList();


条件に引っかからなかった時

List<ScoreDay> scores = FindAll();
IEnumerable<Score> tmpScores = scores.Where(score => score.sec > 6);
if (!tmpScores.Any()) {
    return 0;
}

IEnumerableをListへ変換

IEnumerable<Score> tmpScores = //  略・・・
List<Score> scores = tmpScores.ToList());

数値の合計

List<Score> scores = FindAll();
return scores.Sum(record => record.missCnt);

like検索

List<Score> scores = FindAll();
IEnumerable<Score> scores = scores.Where(record => record.yyyymmdd.Contains("201903")); 
// .Contains("/201903/")); // こういうスラッシュはいらない

likeしたあとの合計

IEnumerable<Score> scores = scores.Where(record => record.yyyymmdd.Contains("201903")); 
Debug.Log("sum=" + scores.Sum(record => record.missCnt));

like前方一致

List<Score> scores = FindAll();
IEnumerable<Score> scores = scores.Where(record => record.yyyymmdd.StartsWith("201903"));

like後方一致

List<Score> scores = FindAll();
IEnumerable<Score> scores = scores.Where(record => record.yyyymmdd.EndsWith("0316"));

GroupByを使う場合

件数をkeyにgroupbyを行った場合

public IEnumerable<IGrouping<int ,User>>FindAllGroupByIdOrderByCntDesc()
{
   List<User> users = FindAll();
   return users
      .GroupBy(value => value.id)
     .OrderByDescending(value => value.Count());
}

List<IGrouping<int, User>> groups = FindAllGroupByIdOrderByCntDesc.FindAllGroupByIdOrderByCntDesc().ToList();
if (groups != null && groups.Count > 0)
{
    foreach (IGrouping<int, User> users in groups)
    {
        Debug.Log("key=" + users.Key);
        User user = new User();
        foreach (User tmpUser in users)
        {
            user = tmpUser;
        }
        if (users.Count() == 0)
        {
            continue;
        }
        Debug.Log(user.name);
    }
}

参考:https://www.sejuku.net/blog/47220

最大値最小値

int ageMax = ages.Max();
int ageMin = ages.Min();

条件に当てはまる件数を取得

tmpScores.Where(n => n.point > 0).Count();

pointが0以上であるものの件数