Question

我正在学习C＃＆amp; amp;有以下代码。

private static Policy ConstructNode(Policy policy, Dictionary<string, dynamic> noticeDictionary)
    {
        Policy policy = new Policy();

        foreach (var pair in noticeDictionary)
        {
        policy.Emails = pair.Value; // HERE, I GET RUNTIME ERROR
        ...
        }
    return policy;
 }

Emails类中的Policy类型为Dictionary<string, uint>＆amp; pair.Value包含Dictionary<string, dynamic>

Noticedictionary如下所示：

noticeDictionary.Add("Notice", JsonConvert.DeserializeObject<Dictionary<string, dynamic>>(val));

val包含JSON字符串，该字符串可以包含带字符串键的字符串或int值。

如何投射它们以免它出错？

Answer 1

Dictionary<string, uint> Converted =  noticeDictionary
    // Next steps converts to an IEnumerable<anonymoustype<string,uint>>
    .Select(kvp=> new { key = kvp.Key , val = (uint)kvp.Value})
    // Now that we have strongly typed data in enumerable form, get it back into a dictionary
    .ToDictionary(item=>item.Key,item=>item.Value);

关于你的第二个问题（如果类型是混合的，我如何转换为无错误），这是不可能的，但如果字符串只是编码uint你可以通过修改选择值来处理这两个

    .Select(kvp=> new { key = kvp.Key , val = (kvp.Value is int) ? (kvp.Value) : uint.Parse((string)kvp.Value)}) // This is untested, let me know if you have trouble

如何将Dictionary <string，dynamic =“”>转换为Dictionary <string，uint =“”>？</string，> </string，>

1 个答案: