If FileStream.Lock is not supported, show an error message about mode…

…=Exclusive
Lovecxgood · Feb 16, 2018 · 731e311 · 731e311
1 parent 79e2dbb
commit 731e311
Showing 1 changed file with 17 additions and 1 deletion.
diff --git a/LiteDB/Utils/Extensions/StreamExtensions.cs b/LiteDB/Utils/Extensions/StreamExtensions.cs
@@ -48,6 +48,10 @@ public static bool TryUnlock(this FileStream stream, long position, long length)
             {
                 return false;
             }
+            catch (PlatformNotSupportedException pex)
+            {
+                throw CreateLockNotSupportedException(pex);
+            }
         }
 
         /// <summary>
@@ -59,9 +63,21 @@ public static void TryLock(this FileStream stream, long position, long length, T
 
             FileHelper.TryExec(() =>
             {
-                stream.Lock(position, length);
+                try
+                {
+                    stream.Lock(position, length);
+                }
+                catch (PlatformNotSupportedException pex)
+                {
+                    throw CreateLockNotSupportedException(pex);
+                }
             }, timeout);
         }
+
+        private static Exception CreateLockNotSupportedException(PlatformNotSupportedException innerEx)
+        {
+            throw new InvalidOperationException("Your platform does not support FileStream.Lock. Please set mode=Exclusive in your connnection string to avoid this error.", innerEx);
+        }
 #endif
     }
 }