c# - 命名空间导致 NullReferenceException？

Question

我有以下程序，这是一段示例代码，展示了 C# 反射如何对类进行操作。一切正常，完全没有问题。

public class Program
{

public static void Main()
{

    Type T = Type.GetType("Customer");
    Console.WriteLine("Information about the Type object: ");
    Console.WriteLine(T.Name);
    Console.WriteLine(T.FullName);
    Console.WriteLine();

    Console.WriteLine("Property info:");
    PropertyInfo[] myPropertyInfoArray = T.GetProperties();

    foreach(PropertyInfo myProperty in myPropertyInfoArray)
    {
        Console.WriteLine(myProperty.PropertyType.Name);
    }
    Console.WriteLine();

    Console.WriteLine("Methods in Customer:");
    MethodInfo[] myMethodInfoArray = T.GetMethods();

    foreach(MethodInfo myMethod in myMethodInfoArray)
    {
        Console.WriteLine(myMethod.Name);
    }


    Console.ReadKey();
}

}


class Customer
{

public int ID {get;set;}
public string Name {get;set;}

public Customer()
{
    this.ID = -1;
    this.Name = string.Empty;
}

public Customer(int ID, string Name)
{
    this.ID = ID;
    this.Name = Name;
}

public void PrintID()
{
    Console.WriteLine("ID: {0}", this.ID);
}

public void PrintName()
{
    Console.WriteLine("Name: {0}", this.Name);
}

}

我遇到的问题是，当我将所有代码包装在一个命名空间中时，我突然在 Type 对象上得到一个 NullReferenceException。为什么会这样？

Answer 1

因为它不再知道客户在哪里。你需要

Type T = Type.GetType("NameSpaceName.Customer");