I've been playing with PostSharp a bit and I ran into a nasty problem.
Following IL in Silverlight assembly:
.method public hidebysig specialname newslot virtual final instance void
set_AccountProfileModifiedAt(valuetype [mscorlib]System.DateTime 'value') cil managed
{
.maxstack 2
.locals (
[0] bool ~propertyHasChanged,
[1] bool CS$4$0000)
L_0000: nop
L_0001: nop
L_0002: ldarg.0
L_0003: call instance valuetype [mscorlib]System.DateTime
Accounts.AccountOwner::get_AccountProfileModifiedAt()
L_0008: ldarg.1
L_0009: call bool [mscorlib]System.DateTime::op_Inequality(valuetype
[mscorlib]System.DateTime, valuetype [mscorlib]System.DateTime)
L_000e: stloc.0
L_000f: ldarg.0
L_0010: ldarg.1
L_0011: stfld valuetype [mscorlib]System.DateTime
Accounts.AccountOwner::accountProfileModifiedAt
L_0016: br.s L_0018
L_0018: ldloc.0
L_0019: ldc.i4.0
L_001a: ceq
L_001c: stloc.1
L_001d: ldloc.1
L_001e: brtrue.s L_002b
L_0020: ldarg.0
L_0021: ldstr "AccountProfileModifiedAt"
L_0026: call instance void
Accounts.AccountOwner::NotifyPropertyChanged(string)
L_002b: nop
L_002c: leave.s L_002e
L_002e: ret
}
triggers System.Security.VerificationException: Operation could destabilize the runtime. exception. Reflector parses it OK. What could be wrong with it?
Update 1 Code is intended to work as follows:
public void set_AccountProfileModifiedAt(DateTime value)
{
bool propertyHasChanged = this.AccountProfileModifiedAt != value;
this.accountProfileModifiedAt = value;
if (propertyHasChanged)
{
this.NotifyPropertyChanged("AccountProfileModifiedAt");
}
}
Update 2 I get specified exception inside the setter itself
Update 3 Making non-static calls as callvirt (NotifyPropertyChanged) does not help
Update 4 Commenting out (for test purposes) code:
L_0018: ldloc.0
L_0019: ldc.i4.0
L_001a: ceq
L_001c: stloc.1
L_001d: ldloc.1
and replacing L_001e: brtrue.s L_002b with L_001e: br.s L_002b does the trick but it's an unconditional return - not what I want.
Update 5 If I use C# compiler to mimic required behavior (I still need to do that with Postsharp) I get following IL:
.method public hidebysig specialname newslot virtual final instance void
set_AccountProfileModifiedAt(valuetype [mscorlib]System.DateTime 'value') cil managed
{
.maxstack 2
.locals init (
[0] bool val,
[1] bool CS$4$0000)
L_0000: nop
L_0001: ldarg.0
L_0002: call instance valuetype [mscorlib]System.DateTime
Accounts.AccountOwner::get_AccountProfileModifiedAt()
L_0007: ldarg.1
L_0008: call bool [mscorlib]System.DateTime::op_Inequality(valuetype
[mscorlib]System.DateTime, valuetype [mscorlib]System.DateTime)
L_000d: stloc.0
L_000e: ldarg.0
L_000f: ldarg.1
L_0010: stfld valuetype [mscorlib]System.DateTime
Accounts.AccountOwner::accountProfileModifiedAt
L_0015: ldloc.0
L_0016: ldc.i4.0
L_0017: ceq
L_0019: stloc.1
L_001a: ldloc.1
L_001b: brtrue.s L_0029
L_001d: ldarg.0
L_001e: ldstr "AccountProfileModifiedAt"
L_0023: call instance void
Accounts.AccountOwner::NotifyPropertyChanged(string)
L_0028: nop
L_0029: ret
}
Note there are minor differences - extra br.s jump at L_0016 and some strange jump L_001e: brtrue.s L_002b. In compiler version I get direct jump to ret.