将 IEnumerable<string> 转换为字典

Question

将 bool distinct 添加到方法 Splitter 并检查 distinct is true 代码是否损坏后。现在的查询不是字典而是 IEnumerable<string>，而是 Dictionary<string, int>。怎么解决的？

这是错误：

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.Dictionary'. An explicit conversion exists (are you missing a cast?)

代码：

private Dictionary<string, int> Splitter(string[] file, bool distinct)
{
    var query = file
        .SelectMany(i => File.ReadLines(i)
        .SelectMany(line => line.Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries))
        .AsParallel()
        .Select(word => word.ToLower())
        .Where(word => !StopWords.Contains(word))
        .Where(word => !StopWordsPl.Contains(word))
        .Where(word => !PopulatNetworkWords.Contains(word))
        .Where(word => !word.All(char.IsDigit)));
        if (distinct)
        {
        query = query.Distinct();
        }

       query.GroupBy(word => word)
            .ToDictionary(g => g.Key, g => g.Count());
       return query;
}

Answer 1

ToDictionaryreturn就是您所需要的。只是 return 而不是 returning query.

return query.GroupBy(word => word)
            .ToDictionary(g => g.Key, g => g.Count());

将 IEnumerable<string> 转换为字典

Converting IEnumerable<string> to Dictionary

c#

dictionary

casting

ienumerable

deferred-execution