公共类 – “由于其保护级别而无法访问。 只能处理公共类型。“

我正在做一个测试项目来了解一个对象的XML序列化，我得到一个奇怪的运行时错误：

namespace SerializeTest { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { } private void serializeConnection(Conn connection) { XmlSerializer serializer = new XmlSerializer(typeof(Conn)); TextWriter textWriter = new StreamWriter(@"serialized.xml"); serializer.Serialize(textWriter, connection); textWriter.Close(); } static List deserializeConnection() { XmlSerializer deserializer = new XmlSerializer(typeof(List)); TextReader textReader = new StreamReader(@"serialized.xml"); List connectionList; connectionList = (List)deserializer.Deserialize(textReader); textReader.Close(); return connectionList; } private void btnSerialize_Click(object sender, EventArgs e) { Conn conn = getConnection(); serializeConnection(conn); } private Conn getConnection() { Conn connection = new Conn(); connection.connectionName = txtName.Text; connection.address = txtAddress.Text; connection.height = 2542; connection.width = 4254; connection.password = txtPassword.Text; connection.smartSizing = false; connection.username = txtUsername.Text; connection.port = 474; return connection; } private void btnDeserialize_Click(object sender, EventArgs e) { int count = deserializeConnection().Count; lblStatus.Text = "Count: " + count; } } class Conn { public Conn() { } public string connectionName { get; set; } public int height { get; set; } public int width { get; set; } public string address { get; set; } public string username { get; set; } public string password { get; set; } public int port { get; set; } public bool smartSizing { get; set; } } } 

该类是公开的 – 我不明白可能导致此错误的原因。 任何帮助，将不胜感激。

Answer 1

class级是公开的

不，这不对。 这是宣言：

 class Conn { ... } 

您尚未指定任何访问修饰符，因此它默认为internal （假设它是非嵌套的）。 仅仅因为它有一个公共构造函数不会公开。 您需要明确公开：

 public class Conn { ... }