在列表中搜索一個值<Dictionary <string，object >>

Question

我有一個List< Dictionary < string, object >>變量，如下所示。

private static List<Dictionary<string, object>> testData = new List<Dictionary<string, object>>(100); 

// Just Sample data for understanding. 
for (int i = 0; i < 100; i++) 
{ 
    var test = new Dictionary<string, object> 
     { 
      { "aaa", "aaa" + i % 4 }, 
      { "bbb", "bbb" + i % 4 }, 
      { "ccc", "ccc" + i % 4 }, 
      { "ddd", "ddd" + i % 4 }, 
      { "eee", "eee" + i % 4 }, 
      { "fff", "fff" + i % 4 }, 
      { "ggg", "ggg" + i % 4 }, 
      { "hhh", "hhh" + i % 4 }, 
      { "iii", "iii" + i % 4 } 
     }; 
    testData.Add(test); 
} 

我想搜索鍵，值的字典的列表，並返回List< Dictionary < string, object >>包含我通過是searchPattern。

Dictionary<string, object> searchPattern = new Dictionary<string, object>(); 
searchPattern .Add("aaa", "aaa4"); 
searchPattern .Add("eee", "eee2"); 
searchPattern .Add("fff", "fff1"); 
searchPattern .Add("ddd", "ddd3"); 


public List<Dictionary<string, object>> SearchList(List<Dictionary<string, object>> testData, Dictionary<string, object> searchPattern) 
{ 
    List<Dictionary<string, object>> result; 

    // Search the list. 

    return result; 
} 

任何其他建議，搜索也讚賞。 非常感謝！

Answer 1

這將返回一個包含搜索模式的所有鍵值對列表中的第一部字典，或null如果重複的值，這將失敗沒有一個。

public Dictionary<string, object> SearchList 
(
    List<Dictionary<string, object>> testData, 
    Dictionary<string, object> searchPattern 
) 
{ 
    return testData.FirstOrDefault(x => searchPattern.All(x.Contains)); 
} 

如果你想把所有的匹配（而不只是第一種）使用Where([...]).ToList()而不是FirstOrDefault([...])。

Answer 2

讓我試試：

public static List<Dictionary<string, object>> SearchList(List<Dictionary<string, object>> testData, Dictionary<string, object> searchPattern) 
    { 
     return testData.Where(t => 
      { 
       bool flag = true; 
       foreach (KeyValuePair<string, object> p in searchPattern) 
       { 
        if (!t.ContainsKey(p.Key) || !t[p.Key].Equals(p.Value)) 
        { 
         flag = false; 
         break; 
        } 
       } 
       return flag; 
      }).ToList(); 

    } 

OR

public static List<Dictionary<string, object>> SearchList(List<Dictionary<string, object>> testData, Dictionary<string, object> searchPattern) 
    { 
     return testData 
        .Where(t => searchPattern.All(p => t.ContainsKey(p.Key) && 
                t[p.Key].Equals(p.Value))) 
        .ToList(); 
    } 

Answer 3

有幾個這樣做的方法。 _Individuals1 = file1.fileIndividuals; _Individuals2 = file2.fileIndividuals;

foreach (KeyValuePair<int, Individual> kvpInd in _Individuals1) 
    { 
     foreach (KeyValuePair<int, Individual> kvpInd2 in _Individuals2) 
     { 
      if (kvpInd.Value.name.name == kvpInd2.Value.name.name) 
      { 
       similarInds.Add(kvpInd.Key, kvpInd.Value); 
      } 
     } 
    } 

var similarInds = file1.fileIndividuals. 
Where(kv1 => file2.fileIndividuals.Any(kv2 => kv1.Value.name.name == kv2.Value.name.name)). 
ToDictionary(kv => kv.Key, kv => kv.Value); 

如果您在使用LINQ，你可以像這樣

Answer 4

如果我理解正確：

var result = testData.Where(dic => searchPattern.All(dic.Contains)) 
        .ToList(); 

Answer 5

我同意armen.shimoon，但是這樣的事情：

public static List<Dictionary<string, object>> SearchList(this List<Dictionary<string, object>> list, 
     Dictionary<string, object> searchPattern) 
    { 
     return list.Where(item => 
      searchPattern.All(x => item.ContainsKey(x.Key) && 
       x.Value.Equals(item[x.Key]) 
      )).ToList(); 
    } 

，然後使用這樣的：

searchResult = testData.SearchList(searchPattern);