In this class, I am setting elp
to ElType
in the constructor.
I can access properties of elp
fine when in the constructor (the // ...
bit is where I'm accessing elp
's properties), but when I try to access elp
in another method - ucp()
- my program crashes with NullReferenceException
.
I can't figure out what I'm doing wrong here, although it would probably be something pretty straight forward.
[Serializable]
public class ElBase : RectangleNode
{
public ElementParameters elp;
public ElBase(ElementParameters ElType)
{
this.elp = ElType;
// ...
}
private void ucp()
{
int i = 0;
if (this.elp.HasInput)
{
// ...
}
}
Either:
elp
is set to null, possibly even in the constructor if there's not a null check there HasInput
property getter is throwing the NullReferenceException
based on code inside it. elp
is a publicly accessible field . Anything can set it to null. :o This should be number 1, but I looked straight past it since no one makes publicly accessible fields, hence it's never a problem. 在不查看调用代码的情况下不能说太多,但看起来传递给构造函数的ElementParameters
是NULL还是未初始化。
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