Fix ActivityTracker ES_BUILD_STANDALONE build

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>

diff --git a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs
index 254df1a..4b465b5 100644 (file)
--- a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs
+++ b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs
@@ -273,11 +273,19 @@ namespace System.Diagnostics.Tracing
 
             if (activityName.EndsWith(EventSource.s_ActivityStartSuffix, StringComparison.Ordinal))
             {
+#if ES_BUILD_STANDALONE
+                return string.Concat(providerName, activityName.Substring(0, activityName.Length - EventSource.s_ActivityStartSuffix.Length));
+#else
                 return string.Concat(providerName, activityName.AsSpan(0, activityName.Length - EventSource.s_ActivityStartSuffix.Length));
+#endif
             }
             else if (activityName.EndsWith(EventSource.s_ActivityStopSuffix, StringComparison.Ordinal))
             {
+#if ES_BUILD_STANDALONE
+                return string.Concat(providerName, activityName.Substring(0, activityName.Length - EventSource.s_ActivityStopSuffix.Length));
+#else
                 return string.Concat(providerName, activityName.AsSpan(0, activityName.Length - EventSource.s_ActivityStopSuffix.Length));
+#endif
             }
             else if (task != 0)
             {