通过字符串路径获取对象值 [英] Get Object value by string path

问题描述

我有这个字符串
Member.User.Name

和此实例:

Root root = new Root();
root.Member.User.Name = "user name";

如何从成员 Member.User.Name

例如:

string res = GetDeepPropertyValue(root, "Member.User.Name");

res 将为用户名"

谢谢

推荐答案

尝试一下:

public object GetDeepPropertyValue(object instance, string path){
  var pp = path.Split('.');
  Type t = instance.GetType();
  foreach(var prop in pp){
    PropertyInfo propInfo = t.GetProperty(prop);
    if(propInfo != null){
      instance = propInfo.GetValue(instance, null);
      t = propInfo.PropertyType;
    }else throw new ArgumentException("Properties path is not correct");
  }
  return instance;
}
string res = GetDeepPropertyValue(root, "Member.User.Name").ToString();

注意:我们不需要递归解决方案，因为预先知道了循环次数.如果可能，使用 foreach 会更有效.仅当实现因 for -foreach 而变得复杂时，我们才使用递归.

NOTE: We don't need recursive solution for this because the number of loops is known beforehand. Using foreach would be more efficient if possible. We use recursion only when the implementation becomes complicated with for - foreach.

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