Manually apply pull request #96 via olegKoshmeliuk

Dapper NET40/SqlMapper.cs

@@ -3389,7 +3389,7 @@ protected void AddParameters(IDbCommand command, SqlMapper.Identity identity)
                     {
                         p.Size = param.Size.Value;
                     }
-                    if (dbType != null)
+                    if (dbType != null && p.DbType != dbType)
                     {
                         p.DbType = dbType.Value;
                     }

Tests/Tests.cs

@@ -2656,12 +2656,31 @@ public void TestDoubleDecimalConversions_SO18228523_Nulls()
         public void TestParameterInclusionNotSensitiveToCurrentCulture()
         {
             CultureInfo current = Thread.CurrentThread.CurrentCulture;
+            try
+            {
                 Thread.CurrentThread.CurrentCulture = new CultureInfo("tr-TR");
 
                 connection.Query<int>("select @pid", new { PId = 1 }).Single();
-
+            }
+            finally
+            {
                 Thread.CurrentThread.CurrentCulture = current;
             }
+        }
+
+        public void TestProcedureWithTimeParameter()
+        {
+            var p = new DynamicParameters();
+            p.Add("a", TimeSpan.FromHours(10), dbType: DbType.Time);
+
+            connection.Execute(@"CREATE PROCEDURE #TestProcWithTimeParameter
+    @a TIME
+    AS 
+    BEGIN
+    SELECT @a
+    END");
+            connection.Query<TimeSpan>("#TestProcWithTimeParameter", p, commandType: CommandType.StoredProcedure).First().IsEqualTo(new TimeSpan(10, 0, 0));
+        }
 
         class HasDoubleDecimal
         {