C# 试图存储在变量'；s弦

我的解决方案中有两个项目：HomeworkCalendar（VB.net Windows窗体应用程序）和HWLib（C#.dll类库）。在库中的CurrentUser类中，我有一个变量定义为

HWLib.User CurrentUser

。这来自HWLib中的用户类：

namespace HWLib
{
    public class User
    {
        /// <summary>
        /// The Name of the User
        /// </summary>
        public String name = null;
        /// <summary>
        /// The Age of the User
        /// </summary>
        public int age = 0;
        /// <summary>
        /// The School Type of the User
        /// </summary>
        public String school = null;
        /// <summary>
        /// The Amount of Classes the User
        /// </summary>
        public int classesCount = 0;
        /// <summary>
        /// The String Array that holds all the classes
        /// </summary>
        public string[] classes;
    }
 }

好的，要让它运行，您需要初始化

currentUser

：

public class CurrentUser
{
    /// <summary>
    /// The current User using the program
    /// </summary>
    public static HWLib.User currentUser = new HWLib.User() ;
}

公共类CurrentUser
{
/// 
///使用该程序的当前用户
/// 
public static HWLib.User currentUser=new HWLib.User（）；
}

但是：

为什么只有一个静态属性的非静态类？只需将当前用户设置为静态

更好的做法是使用属性（带有getter/setter）而不是字段。这允许您在不破坏客户机代码的情况下向get/set添加逻辑

---

currentUser

未初始化。哪一行引发异常？使用调试器！！在该行上放置断点，然后运行程序。当它到达该断点时，将鼠标悬停在各种变量上。它会告诉你哪一个是空的；10个左右，就在那边===>下面谢谢！我犯了一个愚蠢的错误。我真的应该知道这是需要的。

Try
    If intClasses <= 11 Then
        CurrentUser.currentUser.name = txtName.Text
        CurrentUser.currentUser.classesCount = intClasses
        CurrentUser.currentUser.school = cboSchool.SelectedItem
        CurrentUser.currentUser.age = Convert.ToInt32(cboAge.SelectedItem)
    End if
Catch exx As NullReferenceException
   'It does catch! This is the issue! Why does it catch here and how do I fix it?
    File.Delete(Base.filePath)
    MsgBox(exx.ToString())
End Try

public class CurrentUser
{
    /// <summary>
    /// The current User using the program
    /// </summary>
    public static HWLib.User currentUser = new HWLib.User() ;
}