prefer an exact-case backing-field match over a wrong-case regular field...

prefer an exact-case backing-field match over a wrong-case regular field (essentially: this promotes get-only properties over regular fields)

Dapper/DefaultTypeMap.cs

@@ -168,11 +168,11 @@ public SqlMapper.IMemberMap GetMember(string columnName)
             var backingFieldName = $"<{columnName}>k__BackingField";
 
             // preference order is:
-            // exact match over underscre match, backing fields over regular fields, exact case over wrong case
+            // exact match over underscre match, exact case over wrong case, backing fields over regular fields, match-inc-underscores over match-exc-underscores
             var field = _fields.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.Ordinal))
-               ?? _fields.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase))
-               ?? _fields.FirstOrDefault(p => string.Equals(p.Name, backingFieldName, StringComparison.Ordinal))
-               ?? _fields.FirstOrDefault(p => string.Equals(p.Name, backingFieldName, StringComparison.OrdinalIgnoreCase));
+                ?? _fields.FirstOrDefault(p => string.Equals(p.Name, backingFieldName, StringComparison.Ordinal))
+                ?? _fields.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase))
+                ?? _fields.FirstOrDefault(p => string.Equals(p.Name, backingFieldName, StringComparison.OrdinalIgnoreCase));
 
             if (field == null && MatchNamesWithUnderscores)
             {
@@ -180,8 +180,8 @@ public SqlMapper.IMemberMap GetMember(string columnName)
                 backingFieldName = $"<{effectiveColumnName}>k__BackingField";
 
                 field = _fields.FirstOrDefault(p => string.Equals(p.Name, effectiveColumnName, StringComparison.Ordinal))
-                    ?? _fields.FirstOrDefault(p => string.Equals(p.Name, effectiveColumnName, StringComparison.OrdinalIgnoreCase))
                     ?? _fields.FirstOrDefault(p => string.Equals(p.Name, backingFieldName, StringComparison.Ordinal))
+                    ?? _fields.FirstOrDefault(p => string.Equals(p.Name, effectiveColumnName, StringComparison.OrdinalIgnoreCase))
                     ?? _fields.FirstOrDefault(p => string.Equals(p.Name, backingFieldName, StringComparison.OrdinalIgnoreCase));
             }