c# - 在C#中通过字符串获取字典名称

Question

我有一个包含 4 个词典的类。

public class FishInformation
    {
        public int FishId { get; set; }
        public Dictionary<string,int> DicGroup { get; set; }
        public Dictionary<string, int> DicEvent { get; set; }
        public Dictionary<string, int> DicAudience { get; set; }
        public Dictionary<string, int> DicType { get; set; }
    }

我想通过字符串获取字典名称并向其中添加项目。所以this question建议使用 System.Reflection 来这样做。这是我试过的代码:

 FishInformation fishinfo =new Global.FishInformation
            {
                FishId = fishId,
                DicAudience =  new Dictionary<string, int>(),
                DicEvent =  new Dictionary<string, int>(),
                DicGroup =  new Dictionary<string, int>(),
                DicType =  new Dictionary<string, int>()
            };
string relatedDictionary  //It's the variable which contains the string to merge with "Dic" to get the property

fishinfo.GetType().GetProperty("Dic" + relatedDictionary).SetValue(fishinfo, myKey, myValue);

我只是想知道如何让它发挥作用!

Answer 1

您的代码设置整个字典的值，而不是将字符串添加到现有字典。

您需要调用GetValue , 不是 SetValue , 转换到 IDictionary<string,int> ，并为其添加值:

var dict = (IDictionary<string,int>)fishinfo
    .GetType()
    .GetProperty("Dic" + relatedDictionary)
    .GetValue(fishinfo);
dict[myKey] = myValue;

这不是执行此操作的最有效方法 - 您可以使用 enum相反:

enum InfoDict {Group, Event, Audience, Type};
public class FishInformation {
    public int FishId { get; set; }
    private IDictionary<string,int>[] infos = new IDictionary<string,int>[] {
        new Dictionary<string,int>()
    ,   new Dictionary<string,int>()
    ,   new Dictionary<string,int>()
    ,   new Dictionary<string,int>()
    };
    public IDictionary<string,int> GetDictionary(InfoDict index) {
        return infos[index];
    }
}