[英]Getting distinct values from an ArrayList in C#
我有一個看起來像這樣的ArrayList
這就是clientArray的形成方式:
ArrayList clientArray = new ArrayList();
foreach (Dictionary<string, object> media in mediaList)
{
// get the Advertisers container object
Dictionary<string, object> clientContainer = (Dictionary<string, object>)media["Advertisers"];
//get the list of Advertisers (clients)
var clientList = clientContainer["Advertiser"] as ArrayList;
var clientListList = clientList.Cast<Dictionary<string, object>>().ToList();
//add fields not olalready in the dictionary
clientListList.ForEach(d => d.Add("MediaCode", media["Code"].ToString()));
clientListList.ForEach(d => d.Add("MediaName", media["Name"].ToString()));
clientListList.ForEach(d => d.Add("AgencyAlpha", mediaResponse["AgencyAlpha"].ToString()));
clientListList.ForEach(d => d.Add("CreatedBy", System.Reflection.Assembly.GetExecutingAssembly().FullName.ToString()));
clientListList.ForEach(d => d.Add("CreatedDt", DateTime.Now));
foreach (Dictionary<string, object> client in clientListList)
{
clientArray.Add(client);
}
}
這就是clientArray的樣子:
{
"client": [
{
"Code": "ABC",
"Name": "ABC Inc",
"BusinessKey": "ABC123",
"MediaCode": "I",
"MediaName": "Interactive",
"AgencyAlpha": "UB",
"CreatedBy": "DataApi, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
"CreatedDt": "2014-04-08T12:47:54.5855957-04:00"
},
{
"Code": "DEF",
"Name": "DEF Inc",
"BusinessKey": "DEF456",
"MediaCode": "I",
"MediaName": "Interactive",
"AgencyAlpha": "UB",
"CreatedBy": "DataApi, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
"CreatedDt": "2014-04-08T12:47:54.5855957-04:00"
},
etc...
我需要將所有DISTINCT Code
放入一個列表中。 到目前為止我所擁有的是返回所有 Code
(不是我想要的)。 我該怎么做呢?
List<string> listOfCodes = new List<string>();
foreach (Dictionary<string, object> obj in clientArray as IEnumerable)
{
listOfCodes.Insert(0, obj["Code"].ToString());
}
listOfCodes.Distinct().ToList();
這樣的事應該對你有用:
ArrayList = GetMyArrayList() ;
...
List<string> ListOfCodes = clientArray
.Cast<Dictionary<string,object>>()
.Select( x => x["Code"] as string)
.Distinct( StringComparer.OrdinalIgnoreCase )
.ToList()
;
另一種方法是使用HashSet<T>
或SortedSet<T>
,類似於:
IEnumerable<string> codeBag = clientArray
.Cast<Dictionary<string,object>>()
.Select( x => x["Code"] as string)
.Where( s => !string.IsNullOrEmpty(s) )
;
HashSet<string> codeSet = new HashSet<string>( codeBag , StringComparer.OrdinalIgnoreCase ) ;
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