IDictionary上的LINQ操作

Question

假设我有以下词典:

private Dictionary<int, string> dic1 = new Dictionary<int, string>()
{
      { 1, "a" },
      { 2, "b" },
      { 3, "c" }
}

private Dictionary<SomeEnum, bool> dic2 = new Dictionary<SomeEnum, bool>()
{
      { SomeEnum.First, true },
      { SomeEnum.Second, false },
      { SomeEnum.Third, false }
}

我想将这两个词典转换成一个 Dictionary<string, object>

例如:

 dic1 = new Dictionary<string, object>()
 {
     { "1", "a" },
     { "2", "b" },
     { "3", "c" }
 }

 dic2 = new Dictionary<string, object>()
 {
     { "First", true },
     { "Second", false },
     { "Third", false }
 }

正如您所看到的,string这些词典的关键仅仅string是之前词典的表示.

负责转换的方法具有以下签名:

 public static object MapToValidType(Type type, object value)
 {
     //....

     if(typeof(IDictionary).IsAssignableFrom(type))
     {
         //I have to return a Dictionary<string, object> here
         return ??;
     }
 }

我尝试过以下方法:

 ((IDictionary)value).Cast<object>().ToDictionary(i => ...);

但是i被转换为一个对象,所以我无法访问键或值项.为此,我需要将它投射到适当的KeyValuePair<TKey, TValue>,但我不知道TKey或TValue输入.

另一个解决方案是这样做:

IDictionary dic = (IDictionary)value;
IList<string> keys = dic.Keys.Cast<object>().Select(k => Convert.ToString(k)).ToList();
IList<object> values = dic.Values.Cast<object>().ToList();
Dictionary<string, object> newDic = new Dictionary<string, object>();
for(int i = 0; i < keys.Count; i++)
   newDic.Add(keys[0], values[0]);
return newDic;

但是,我并不喜欢这种方法,我真的在寻找一个更简单,更友好的单行LINQ语句.

Answer 1

你可以试试这个，虽然没有 LINQ，但我认为你不需要：

 Dictionary<string, object> ConvertToDictionary(System.Collections.IDictionary iDic) {
            var dic = new Dictionary<string, object>();
            var enumerator = iDic.GetEnumerator();
            while (enumerator.MoveNext()) {
                dic[enumerator.Key.ToString()] = enumerator.Value;
            }
        return dic;
    }

或 Linq 之一：

return iDic.Keys.Cast<object>().ToDictionary(k=> k.ToString(), v=> iDic[v]);