c# - 使用反射循环遍历类变量

Question

我想遍历一个类并列出它的变量。这已在 SO 上被多次询问，我已经尝试了所有答案。

出于某种原因，我无法使解决方案起作用。当我运行下面的代码时(它应该循环遍历类两次，只是为了尝试不同的方式)，答案只是读取“Test1”，这意味着它没有循环遍历类。

有谁知道为什么循环没有运行？

public partial class Tables : Form
{
  private void dataGridViewNodes_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        Debug.WriteLine("test1");
        //Simple Test
        foreach (PropertyInfo prop in typeof(NodeHeaders).GetProperties())
        {
            Debug.WriteLine("test2");
            Debug.WriteLine(prop.Name);
        }

        //the above should have looped through the class so let's try again
        var nodeHeaders = new NodeHeaders();
        Type t = nodeHeaders.GetType();
        string fieldName;
        object propertyValue;

        // Use each property of the object passed in
        foreach (PropertyInfo pi in t.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
        {
            // Get the name of the property
            fieldName = pi.Name;

            // Get the value of the property
            propertyValue = pi.GetValue(nodeHeaders, null);
            Debug.WriteLine("test3");
            Debug.WriteLine(fieldName + ": " + (propertyValue == null ? "null" : propertyValue.ToString()));
        }

    }
}

public class NodeHeaders
{
    public static string node_name = "Conduit Name";
    public static string x = "Easting (m)";
    public static string y = "Northing (m)";
    public static string z_cover = "Cover Level (m)";

}

---

编辑:

根据评论表 Nico Schertler 解释说我需要循环遍历字段而不是属性我也尝试了以下结果相同。

Type type = typeof(NodeHeaders);
foreach (var p in type.GetFields(System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic))
{
    var v = p.GetValue(null); // static classes cannot be instanced, so use null...
    Debug.WriteLine(v.ToString());
}

Answer 1

因为你要访问的东西是公共(public)静态字段，你应该使用t.GetFields(BindingFlags.Static | BindingFlags.Public)

foreach (var field in typeof(NodeHeaders).GetFields(BindingFlags.Static | BindingFlags.Public))
{        
    // Get the name of the property
    string fieldName = field.Name;
    // Get the value of the property
    object propertyValue = field.GetValue(null);
    Console.WriteLine("test3");
    Console.WriteLine(fieldName + ": " + (propertyValue == null ? "null" : propertyValue.ToString()));
}

这将正确访问字段值: