C# 如何使用字符串属性路径获取/设置属性值？

假设我们有一个具有BasicDetails类属性的类根，然后BasicDetails有两个属性。字符串“Name”和动态对象“CustomAttributes”

我希望通过以下方式获取值：

  var root = new Root();
  root.BasicDetails.Name = "Samurai";
  root.BasicDetails.CustomAttributes.phone = "12345";
  string res1 = GetDeepPropertyValue(root, "BasicDetails.CustomAttributes.Phone").ToString();
  string res2 = GetDeepPropertyValue(root, "BasicDetails.Name").ToString();

public static object GetDeepPropertyValue(object src, string propName)
{
    if (propName.Contains('.'))
    {
        string[] Split = propName.Split('.');
        string RemainingProperty = propName.Substring(propName.IndexOf('.') + 1);
        return GetDeepPropertyValue(src.GetType().GetProperty(Split[0]).GetValue(src, null), RemainingProperty);
    }
    else
        return src.GetType().GetProperty(propName).GetValue(src, null);
}

public class Root
{
    public Root()
    {
        BasicDetails = new BasicDetails();
    }
    public BasicDetails BasicDetails { get;set;}
}
public class BasicDetails
{
    public BasicDetails()
    {
        CustomAttributes = new ExpandoObject();
    }
    public string Name { get; set; }
    public dynamic CustomAttributes { get; set; }
}

以下是我尝试过的代码（基于SO的另一个答案）：

  var root = new Root();
  root.BasicDetails.Name = "Samurai";
  root.BasicDetails.CustomAttributes.phone = "12345";
  string res1 = GetDeepPropertyValue(root, "BasicDetails.CustomAttributes.Phone").ToString();
  string res2 = GetDeepPropertyValue(root, "BasicDetails.Name").ToString();

public static object GetDeepPropertyValue(object src, string propName)
{
    if (propName.Contains('.'))
    {
        string[] Split = propName.Split('.');
        string RemainingProperty = propName.Substring(propName.IndexOf('.') + 1);
        return GetDeepPropertyValue(src.GetType().GetProperty(Split[0]).GetValue(src, null), RemainingProperty);
    }
    else
        return src.GetType().GetProperty(propName).GetValue(src, null);
}

public class Root
{
    public Root()
    {
        BasicDetails = new BasicDetails();
    }
    public BasicDetails BasicDetails { get;set;}
}
public class BasicDetails
{
    public BasicDetails()
    {
        CustomAttributes = new ExpandoObject();
    }
    public string Name { get; set; }
    public dynamic CustomAttributes { get; set; }
}

以下是课程：

  var root = new Root();
  root.BasicDetails.Name = "Samurai";
  root.BasicDetails.CustomAttributes.phone = "12345";
  string res1 = GetDeepPropertyValue(root, "BasicDetails.CustomAttributes.Phone").ToString();
  string res2 = GetDeepPropertyValue(root, "BasicDetails.Name").ToString();

public static object GetDeepPropertyValue(object src, string propName)
{
    if (propName.Contains('.'))
    {
        string[] Split = propName.Split('.');
        string RemainingProperty = propName.Substring(propName.IndexOf('.') + 1);
        return GetDeepPropertyValue(src.GetType().GetProperty(Split[0]).GetValue(src, null), RemainingProperty);
    }
    else
        return src.GetType().GetProperty(propName).GetValue(src, null);
}

public class Root
{
    public Root()
    {
        BasicDetails = new BasicDetails();
    }
    public BasicDetails BasicDetails { get;set;}
}
public class BasicDetails
{
    public BasicDetails()
    {
        CustomAttributes = new ExpandoObject();
    }
    public string Name { get; set; }
    public dynamic CustomAttributes { get; set; }
}

---

我尝试过的函数抛出空引用错误。不幸的是，我不太理解反射，所以目前我正在修补。如果有人能解释一下如何做到这一点，那就太好了。提前感谢。

以下方法从嵌套属性获取值：

    public static object GetPropertyValue(object src, string propName)
    {
        if (src == null) throw new ArgumentException("Value cannot be null.", "src");
        if (propName == null) throw new ArgumentException("Value cannot be null.", "propName");

        if (propName.Contains("."))//complex type nested
        {
            var temp = propName.Split(new char[] { '.' }, 2);
            return GetPropertyValue(GetPropertyValue(src, temp[0]), temp[1]);
        }
        else
        {
            if (src is ExpandoObject)
            {
                var expando = src as IDictionary<string, object>;

                if (expando != null)
                {
                    object obj;
                    expando.TryGetValue(propName, out obj);
                    return obj;
                }

                return null;
            }
            else
            {
                var prop = src.GetType().GetProperty(propName);
                return prop != null ? prop.GetValue(src, null) : null;
            }
        }
    }

---

大家好，

ExpandoObject

来自哪里？似乎是missing@Scircia它是

System.Dynamic

namespaceAh@PavelAnikhouski中的一个内置类。我的坏哈哈。@SamuraiJack，问题来自

src.GetType（）.GetProperty（propName）。GetValue（src，null）

由于

GetProperty

将在

ExpandoObject

上返回null，这将导致NullReferenceException。德里克很好地解释了这一点。您需要更改

GetDeepPropertyValue

的逻辑，并在调用

GetValue

之前检查

src.GetType（）.GetProperty（propName）

是否返回任何内容。如果它没有得到值，则需要创建一个检查来确定什么是src，并基于该值获取它的值value@SamuraiJack,我附上了一个工作代码示例。对于ExpandoObject，需要另一个解决方案。它可以完美地工作！我明白，对于expando对象，我需要以不同的方式处理它，但即使存在另一个类对象而不是ExpandoObject，解决方案也不起作用。我想知道为什么/你也有打字错误，属性“phone”是通过设置用小写字母写的，通过获取它是大写字母。