To be more lazy, I just want to write less code but do the same thing, so I did a test. Just want to use some Attribute and use mono.cecil to inject the .dll file with some il code. And the following is the detail: When coding these:
[FillProperty("Counter")]
public int Counter
{
get;
set;
}
After injecting, there is the new code generated(By ILSpy)(C# code):
public int Counter
{
[CompilerGenerated]
get
{
return this.<Counter>k__BackingField;
}
[CompilerGenerated]
set
{
if (this.<Counter>k__BackingField != value)
{
this.<Counter>k__BackingField = value;
this.<Counter>k__BackingField.TriggerEvent("Counter");
}
}
}
The definition code:
`private int <Counter>k__BackingField;`
can not be seen, but the IL code is fine:
IL_0000: ldarg.0
IL_0001: ldfld int32 AssemblyTest::'<Counter>k__BackingField'
IL_0006: ldarg.1
IL_0007: beq IL_0023
IL_000c: ldarg.0
IL_000d: ldarg.1
IL_000e: stfld int32 AssemblyTest::'<Counter>k__BackingField'
IL_0013: ldarg.0
IL_0014: ldfld int32 AssemblyTest::'<Counter>k__BackingField'
IL_0019: ldstr "Counter"
IL_001e: callvirt void ['Assembly-CSharp']ExMethod::TriggerEvent<int32>(!!0, string)
IL_0023: ret
And the definition code is fine too:
.field private int32 '<Counter>k__BackingField'
.custom instance void [mscorlib]System.Runtime.CompilerServices.CompilerGeneratedAttribute::.ctor() = (
01 00 00 00
)
But when I run the injected code, it throws an exception as: "NullReferenceException: Object reference not set to an instance of an object AssemblyTest.set_Counter (Int32 value)". So is there anyone who can give me some tips.
The method void ['Assembly-CSharp']ExMethod::TriggerEvent<int32>(!!0, string)
is an extension method, therefore it is static
. Calls to static methods are made using OpCodes.Call
. Switch Callvirt
to Call
and it should fix your issue.
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