Added support for ICustomQueryParameters to be members of a dictionary that...

Added support for ICustomQueryParameters to be members of a dictionary that can then be passed into a new DynamicParameters object.

Generally, working with an IDictionary<string,object> and DynamicParameters has worked well.  However, when one of the entries in the dictionary is an ICustomQueryParameter, it would blow up in the SqlMapper.LookupDbType method.  This allows parameters that are part of a dictionary to simply call 'AddParameter' passing in the command and name.

Dapper NET40/SqlMapper.cs

@@ -3112,8 +3112,9 @@ protected void AddParameters(IDbCommand command, SqlMapper.Identity identity)
                 var dbType = param.DbType;
                 var val = param.Value;
                 string name = Clean(param.Name);
+                var isCustomQueryParameter = typeof(SqlMapper.ICustomQueryParameter).IsAssignableFrom(val.GetType());
 
-                if (dbType == null && val != null) dbType = SqlMapper.LookupDbType(val.GetType(), name);
+                if (dbType == null && val != null && !isCustomQueryParameter) dbType = SqlMapper.LookupDbType(val.GetType(), name);
 
                 if (dbType == DynamicParameters.EnumerableMultiParameter)
                 {
@@ -3121,6 +3122,10 @@ protected void AddParameters(IDbCommand command, SqlMapper.Identity identity)
                     SqlMapper.PackListParameters(command, name, val);
 #pragma warning restore 612, 618
                 }
+                else if (isCustomQueryParameter)
+                {
+                    ((SqlMapper.ICustomQueryParameter)val).AddParameter(command, name);
+                }
                 else
                 {
 
@@ -3610,4 +3615,4 @@ public partial class FeatureSupport
 
 #endif
 
-}
\ No newline at end of file
+}