对象引用未设置到对象的实例 - 错误

Question

我有一个枚举，它是数组列表（它是可选的，您最多可以添加 5 次）

Public DiseaseTreatment() As TreatmentsetDiseaseTreatment

Public Enum TreatmentsetDiseaseTreatment
'''<remarks/>
<System.Xml.Serialization.XmlEnumAttribute("01")>  _
Item01

''<remarks/>
Antibiotics
''<remarks/>
<System.Xml.Serialization.XmlEnumAttribute("02")>  _
Item02

'''<remarks/>
<System.Xml.Serialization.XmlEnumAttribute("Pain Killers)")>  _
PainKillers

中断

Dim temptreatment As List(Of TreatmentsetDiseaseTreatment)= New List(Of TreatmentsetDiseaseTreatment)()
temptreatment.Add("Painkiller")
For i As Integer = 0 To temptreatment(i) - 1
   test.TreatmentTypes(i) = temptreatment(i)
Next

当我将鼠标悬停在 tempTreatment(i) 上时，它有正确的字符串 "painkiller" 所以我不明白它是如何抛出 NullReferenceException?

Answer 1

您想在数组末尾停止，而不是在数组中第 x 项的末尾。

For i As Integer = 0 To temptreatment.Count - 1

没有

For i As Integer = 0 To temptreatment(i) - 1

对象引用未设置到对象的实例 - 错误

Object reference not set to an instance of an object - Error

vb.net

arrays

list

nullreferenceexception