Allow for a missing datasource which means that the datasource is a FullUri like:

FullUri=file::memory:?cache=shared;Version=3

Author: jonkeda

SQLite.CodeFirst/Internal/Utility/ConnectionStringParser.cs

@@ -17,10 +17,17 @@ internal static class ConnectionStringParser
 
         public static string GetDataSource(string connectionString)
         {
-            var path = ExpandDataDirectory(ParseConnectionString(connectionString)[DataSourceToken]);
-            // remove quotation mark if exists
-            path = path.Trim('"');
-            return path;
+            // Check if the datasource token exists and return Null if it doesn't.
+            // This will allow connection strings with FullUri to work.
+            IDictionary<string, string> strings = ParseConnectionString(connectionString);
+            if (strings.ContainsKey(DataSourceToken))
+            {
+                var path = ExpandDataDirectory(ParseConnectionString(connectionString)[DataSourceToken]);
+                // remove quotation mark if exists
+                path = path.Trim('"');
+                return path;
+            }
+            return null;
         }
 
         [SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase", Justification = "ToUppercase makes no sense.")]

SQLite.CodeFirst/Internal/Utility/InMemoryAwareFile.cs

@@ -52,7 +52,9 @@ public static void CreateDirectory(string path)
 
         private static bool IsInMemoryPath(string path)
         {
-            return string.Equals(path, ":memory:", StringComparison.OrdinalIgnoreCase);
+            // If the path doesn't exists then the datasource was empty as probably a FullUri was specified instead.
+            return string.IsNullOrEmpty(path)
+                   || string.Equals(path, ":memory:", StringComparison.OrdinalIgnoreCase);
         }
     }
 }