- 增加 FreeSqlBuilder UseNameConvert 方法，类名、属性名都生效；

- 调整 FreeSqlBuilder，准备移除 UseEntityPropertyNameConvert/UseSyncStructureToLower/UseSyncStructureToUpper 方法；#260

FreeSql/Internal/StringConvertType.cs

@@ -1,4 +1,6 @@
-namespace FreeSql.Internal
+using System;
+
+namespace FreeSql.Internal
 {
     public enum StringConvertType
     {
@@ -42,4 +44,54 @@
         /// </summary>
         Lower
     }
+
+    public enum NameConvertType
+    {
+        /// <summary>
+        /// 不进行任何处理
+        /// </summary>
+        None = 0,
+
+        /// <summary>
+        /// 将帕斯卡命名字符串转换为下划线分隔字符串
+        /// <para></para>
+        /// BigApple -> Big_Apple
+        /// </summary>
+        PascalCaseToUnderscore,
+
+        /// <summary>
+        /// 将帕斯卡命名字符串转换为下划线分隔字符串，且转换为全大写
+        /// <para></para>
+        /// BigApple -> BIG_APPLE
+        /// </summary>
+        PascalCaseToUnderscoreWithUpper,
+
+        /// <summary>
+        /// 将帕斯卡命名字符串转换为下划线分隔字符串，且转换为全小写
+        /// <para></para>
+        /// BigApple -> big_apple
+        /// </summary>
+        PascalCaseToUnderscoreWithLower,
+
+        /// <summary>
+        /// 将下划线分隔字符串命名字符串转换为帕斯卡
+        /// <para></para>
+        /// big_apple -> BigApple
+        /// </summary>
+        UnderscoreToPascalCase,
+
+        /// <summary>
+        /// 将字符串转换为大写
+        /// <para></para>
+        /// BigApple -> BIGAPPLE
+        /// </summary>
+        ToUpper,
+
+        /// <summary>
+        /// 将字符串转换为小写
+        /// <para></para>
+        /// BigApple -> bigapple
+        /// </summary>
+        ToLower
+    }
 }

FreeSql/Internal/StringUtils.cs

@@ -1,20 +0,0 @@
-using System.Linq;
-
-namespace FreeSql.Internal
-{
-    public static class StringUtils
-    {
-        /// <summary>
-        /// 将帕斯卡命名字符串转换为下划线分隔字符串
-        /// <para></para>
-        /// BigApple -> Big_Apple
-        /// </summary>
-        /// <param name="str"></param>
-        /// <returns></returns>
-        public static string PascalCaseToUnderScore(string str)
-        {
-            return string.Concat(str.Select((x, i) =>
-                i > 0 && char.IsUpper(x) ? "_" + x.ToString() : x.ToString()));
-        }
-    }
-}