| Reporter |
Lauri Kotilainen (rytmis)
|
|---|---|
| Created | Apr 10, 2012 12:01:58 PM |
| Updated | Apr 11, 2012 1:16:47 AM |
| Priority | Normal |
| Type | Bug |
| Fix versions | No Fix versions |
| State | Submitted |
| Assignee | Evgeny Pasynkov (pasynkov) |
| Subsystem | Code Analysis |
| Affected versions | 7.0 Preview |
| Fixed in build | No Fixed in build |
Given the following code (using DirectShowNet):
var evr = new EnhancedVideoRenderer();
filter = evr as IBaseFilter;
var videoRenderer = filter as IMFVideoRenderer;
if (videoRenderer == null)
throw new Exception("Could not QueryInterface for the IMFVideoRenderer");
ReSharper underlines both 'as' casts, marking them as 'suspicious', then determines that the if condition is always true, and grays out all the code following the if clause saying it's heuristically unreachable. Unfortunately, that's wrong, as the classes in question are COM RCWs, and the casts are actually QueryInterface calls (that succeed at runtime, too).
var evr = new EnhancedVideoRenderer();
filter = evr as IBaseFilter;
var videoRenderer = filter as IMFVideoRenderer;
if (videoRenderer == null)
throw new Exception("Could not QueryInterface for the IMFVideoRenderer");
ReSharper underlines both 'as' casts, marking them as 'suspicious', then determines that the if condition is always true, and grays out all the code following the if clause saying it's heuristically unreachable. Unfortunately, that's wrong, as the classes in question are COM RCWs, and the casts are actually QueryInterface calls (that succeed at runtime, too).