Insert null check

emoacht · emoacht · commit dcd535a5b1cb · 2026-03-22T00:16:47.000+09:00
diff --git a/Source/Monitorian.Core/Models/Monitor/DisplayMonitorProvider.cs b/Source/Monitorian.Core/Models/Monitor/DisplayMonitorProvider.cs
@@ -115,7 +115,8 @@ public static async Task<DisplayItem[]> GetDisplayMonitorsAsync()
 			{
 				foreach (var device in devices)
 				{
-					if (!device.Properties.TryGetValue(deviceInstanceIdKey, out object value))
+					// Null check is inserted because NullReferenceException is observed in this method.
+					if ((device is null) || !device.Properties.TryGetValue(deviceInstanceIdKey, out object value))
 						continue;
 
 					var deviceInstanceId = value as string;

Original file line number	Diff line number	Diff line change
`@@ -115,7 +115,8 @@ public static async Task<DisplayItem[]> GetDisplayMonitorsAsync()`
`115`	`115`	`{`
`116`	`116`	`foreach (var device in devices)`
`117`	`117`	`{`
`118`		`- if (!device.Properties.TryGetValue(deviceInstanceIdKey, out object value))`
	`118`	`+ // Null check is inserted because NullReferenceException is observed in this method.`
	`119`	`+ if ((device is null) \|\| !device.Properties.TryGetValue(deviceInstanceIdKey, out object value))`
`119`	`120`	`continue;`
`120`	`121`
`121`	`122`	`var deviceInstanceId = value as string;`