c# - 我如何写入文本文件并从文本文件读回字典>？

Question

为了阅读，我尝试了这段代码:

在 Form1 的顶部我做了:

Dictionary<string, List<string>> LocalyKeyWords = new Dictionary<string, List<string>>();

在我做的构造函数中:

keywords = @"d:\Keywords.txt";
            if (File.Exists(keywords))
            {
                LoadKeys(LocalyKeyWords, keywords);
            }

LoadKeys函数:

private void LoadKeys(Dictionary<string,List<string>> disctionary, string FileName)
        {
            var lines = File.ReadAllLines(keywords).Select(l => l.Split(','));
            var dict = new Dictionary<string, List<string>>();
            foreach(var splits in lines)
            {
                var key = splits.First();
                var value = splits.Skip(1).ToList();
                try {dict.Add(key, value);
                }
                catch(Exception ex)
                {  } } 
        }

没有异常，但在调用函数并完成所有操作后的构造函数中，LocalyKeyWords 为空。

---

这就是我今天将键和值写入文件的方式:

private void button6_Click(object sender, EventArgs e)
        {

            using (var w = new StreamWriter(keywords))
            {
                crawlLocaly1 = new CrawlLocaly();
                crawlLocaly1.StartPosition = FormStartPosition.CenterParent;
                DialogResult dr = crawlLocaly1.ShowDialog(this);
                if (dr == DialogResult.OK)
                {
                    if (LocalyKeyWords.ContainsKey(mainUrl))
                    {
                        LocalyKeyWords[mainUrl].Clear();
                        LocalyKeyWords[mainUrl].Add(crawlLocaly1.getText());
                    }
                    else
                    {
                        LocalyKeyWords[mainUrl] = new List<string>();
                        LocalyKeyWords[mainUrl].Add(crawlLocaly1.getText());
                    }
                    foreach (KeyValuePair<string, List<string>> kvp in LocalyKeyWords)
                    {
                        w.WriteLine(kvp.Key + "," + string.Join(",", kvp.Value));
                    }
                }
            } 
        }

也许现在您将能够解决在构造函数中加载键和值的问题，并解决每次我在 button6 单击事件中更改键或值时如何编写的问题。

Answer 1

var lines = File.ReadAllLines("path/to/file").Select(l => l.Split(','));
var dict = new Dictionary<string, List<string>();
foreach(var splits in lines) 
{
    var key = splits.First();
    var value = splits.Skip(1).ToList();
    try {dict.Add(key, value);}
    catch(Exception ex) { //TODO: handle }
}
return dict;