让我们创建一个扩展类来扩展对象类型。然后，我们可以在任何对象类中使用下面的扩展，例如苹果，香蕉和橙子。;）

// Object Extensions
public static class ObjectExtensions
{
    public static List<string> GetStringValues(this object o)
    {
        var values = new List<string>(); // List of string property values
        var properties = o.GetType().GetProperties(); // Get all properties
        foreach (var property in properties) // Loop through properties
        {
            if (property.PropertyType == typeof(string)) // Check if property is string
                values.Add(property.GetValue(o).ToString()); // Add value to values
            else if (property.PropertyType.GetProperties().Length > 0) // Check if property has properties
            {
                var subValues = GetStringValues(property.GetValue(o)); // Recursion
                values.AddRange(subValues); // Add sub values to values
            }
        }
        return values;
    }
}

public class Apple
{
    public string Name { get; set; }
    public string ReleasedYear { get; set; }
    public string SweetnessType { get; set; }
    public string Color { get; set; }
    public Stem StemType { get; set; }
}

public class Stem
{
    public string name { get; set; }
    public string supplier { get; set; }
}

var apple = new Apple()
{
    Name = "hodor", ReleasedYear = "1999",
    SweetnessType = "FruitLevel",
    Color = "Green",
    StemType = new Stem()
    {
        name = "stemar",
        supplier = "apple"
    }
};

// Now you can simply call the method 'GetStringValues'
// that has been extended to all of your objects.
apple.GetStringValues();

好吧，这里有一个解决问题的方法：

private static List<string> GetAllStringValuesFromObject(object model)
{
    var result = new List<string>();

    PropertyInfo[] properties = model.GetType().GetProperties();

    foreach (PropertyInfo modelProp in properties)
    {
        if (modelProp.PropertyType == typeof(string))
        {
            result.Add(modelProp.GetValue(model).ToString());
        }
        else if (modelProp.PropertyType.IsClass)
        {
            // Pass in the value of the class, not the property itself, then add the result to the list.
            result.AddRange(GetAllStringValuesFromObject(modelProp.GetValue(model)));
        }
    }

    return result;
}

在你最初的GetAllStringValuesFromObject()中，你有一个关键的错误。如果迭代的modelProp是一个类，则传入PropertyInfo对象而不是属性的**Value。**此外，您将其设置为在该点返回，而不是添加到result列表，因此它将不返回任何内容。
希望这有助于澄清这个问题！