- 增加 "x1".First/FirstOrDefault 表达式函数解析；

2025-11-04 17:20:49 +08:00 · 2020-07-31 02:28:37 +08:00
parent f63a69c55c
commit af153295f8
33 changed files with 364 additions and 1 deletions
--- a/Providers/FreeSql.Provider.SqlServer/SqlServerExpression.cs
+++ b/Providers/FreeSql.Provider.SqlServer/SqlServerExpression.cs
@@ -105,6 +105,16 @@ namespace FreeSql.SqlServer
                        objExp = callExp.Arguments.FirstOrDefault();
                        objType = objExp?.Type;
                        argIndex++;
+
+                        if (objType == typeof(string))
+                        {
+                            switch (callExp.Method.Name)
+                            {
+                                case "First":
+                                case "FirstOrDefault":
+                                    return $"substring({getExp(callExp.Arguments[0])}, 1, 1)";
+                            }
+                        }
                    }
                    if (objType == null) objType = callExp.Method.DeclaringType;
                    if (objType != null || objType.IsArrayOrList())