fix: preserve connection string values containing equals signs

ParseConnectionString split each pair on every '=' and kept only the second
segment, truncating any Data Source value that contains '=' at the first one.
Split on the first '=' only. Also assign via the dictionary indexer (last value
wins) instead of Add, so a repeated key no longer throws.

Author: msallin

SQLite.CodeFirst.Test/UnitTests/Utility/ConnectionStringParserTest.cs

@@ -106,5 +106,33 @@ public void GetDataSource_ReturnsCorrectDataSource_RemovesQuotationMark()
             // Assert
             Assert.AreEqual(@".\db\footballDb\footballDb.sqlite", result);
         }
+
+        [TestMethod]
+        public void GetDataSource_ReturnsCorrectDataSource_WhenValueContainsEqualsSign()
+        {
+            // Arrange
+            string connectionString = @"data source=.\db\foo=bar\footballDb.sqlite;foreign keys=true";
+
+
+            // Act
+            string result = ConnectionStringParser.GetDataSource(connectionString);
+
+            // Assert
+            Assert.AreEqual(@".\db\foo=bar\footballDb.sqlite", result);
+        }
+
+        [TestMethod]
+        public void GetDataSource_ReturnsLastValue_WhenKeyIsRepeated()
+        {
+            // Arrange
+            string connectionString = @"data source=first.sqlite;data source=second.sqlite";
+
+
+            // Act
+            string result = ConnectionStringParser.GetDataSource(connectionString);
+
+            // Assert
+            Assert.AreEqual(@"second.sqlite", result);
+        }
     }
 }

SQLite.CodeFirst/Internal/Utility/ConnectionStringParser.cs

@@ -42,10 +42,13 @@ private static IDictionary<string, string> ParseConnectionString(string connecti
             IDictionary<string, string> keyValuePairDictionary = new Dictionary<string, string>();
             foreach (var keyValuePair in keyValuePairs)
             {
-                string[] keyValue = keyValuePair.Split(KeyValueSeperator);
+                // Split on the first '=' only so a value that itself contains '=' is preserved.
+                // Input:  "data source=C:\a=b.sqlite"  ->  key="data source", value="C:\a=b.sqlite"
+                string[] keyValue = keyValuePair.Split(new[] { KeyValueSeperator }, 2, StringSplitOptions.None);
                 if (keyValue.Length >= 2)
                 {
-                    keyValuePairDictionary.Add(keyValue[KeyPosition].Trim().ToLower(CultureInfo.InvariantCulture), keyValue[ValuePosition]);
+                    // Indexer assignment (last value wins) so a repeated key does not throw.
+                    keyValuePairDictionary[keyValue[KeyPosition].Trim().ToLower(CultureInfo.InvariantCulture)] = keyValue[ValuePosition];
                 }
             }