创建字典<enum, list<objec> &gt; 从列表<object>使用 LINQ C#<div id="text_translate"><p> 我有以下枚举和 class：</p><pre> public enum SymbolTypeEnum { [Description("Forex")] forex = 0, [Description("Metals")] metals = 1, [Description("Commodities")] commodities = 2, [Description("Indices")] indices = 3, [Description("Cryptocurrency")] cryptocurrency = 4, [Description("Other")] other = 5 } public enum SymbolClassificationEnum { [Description("None")] none = 0, [Description("Major")] major = 1, [Description("Minor")] minor = 2, [Description("Exotic")] exotic = 3 } public class SymbolSettingsModel { [PrimaryKeyAttribute, Unique] public string symbolName { get; set; } public SymbolTypeEnum symbolType { get; set; } public SymbolClassificationEnum symbolClassification { get; set; } }</pre><p> 我有一个List&lt;SymbolSettingsModel&gt; symbolSettings;</p><p> 我的目标是生成Dictionary&lt;SymbolTypeEnum, List&lt;SymbolDescr&gt;&gt; typeSymbolsSettingsData;</p><p> SymbolDescr 在哪里：</p><pre> class SymbolDescr { public string symbol { get; set; } public int classification { get; set; } }</pre><p> 想法是按 symbolType 对它们进行分组，并将其用作字典的 Key，并生成 SymbolDescr 列表。 到目前为止，这是我的代码：</p><pre> typeSymbolsSettingsData = symbolSettings.GroupBy(p =&gt; p.symbolType).ToDictionary(p =&gt; p.Key, p =&gt; p.ToList());</pre><p> 我被困在这一点上，你有什么想法我该怎么做吗？</p></div></object></enum,>

Question

我有以下枚举和 class：

public enum SymbolTypeEnum
{
    [Description("Forex")]
    forex = 0,
    [Description("Metals")]
    metals = 1,
    [Description("Commodities")]
    commodities = 2,
    [Description("Indices")]
    indices = 3,
    [Description("Cryptocurrency")]
    cryptocurrency = 4,
    [Description("Other")]
    other = 5
}

public enum SymbolClassificationEnum
{
    [Description("None")]
    none = 0,
    [Description("Major")]
    major = 1,
    [Description("Minor")]
    minor = 2,
    [Description("Exotic")]
    exotic = 3
}
public class SymbolSettingsModel
{
    [PrimaryKeyAttribute, Unique]
    public string symbolName { get; set; }
    public SymbolTypeEnum symbolType { get; set; }
    public SymbolClassificationEnum symbolClassification { get; set; }
}

我有一个List<SymbolSettingsModel> symbolSettings;

我的目标是生成Dictionary<SymbolTypeEnum, List<SymbolDescr>> typeSymbolsSettingsData;

SymbolDescr 在哪里：

class SymbolDescr
{
    public string symbol { get; set; }
    public int classification { get; set; }
}

想法是按 symbolType 对它们进行分组，并将其用作字典的 Key，并生成 SymbolDescr 列表。 到目前为止，这是我的代码：

typeSymbolsSettingsData = symbolSettings.GroupBy(p => p.symbolType)
            .ToDictionary(p => p.Key, p => p.ToList());

我被困在这一点上，你有什么想法我该怎么做吗？

Answer 1

您可以使用Select将您的SymbolSettingsModel实例投影到SymbolDescr实例中：

typeSymbolsSettingsData = symbolSettings
    .GroupBy(p => p.symbolType)
    .ToDictionary(
        p => p.Key,
        p => p.Select(x => new SymbolDescr
        {
            symbol = x.symbolName,
            classification = (int)x.symbolClassification
        })
        .ToList());

您还应该尝试遵守强制使用 PascalCase 的.Net 属性命名约定。