- 优化 表达式中不能使用 c# 函数的问题，

> 如：where(a => HttpContext.Session.GetString("UserID") == a.UserId)

FreeSql.Tests/FreeSql.Tests/UnitTest1.cs

@@ -322,10 +322,12 @@ namespace FreeSql.Tests
         [Fact]
         public void Test1()
         {
-            g.sqlite.Aop.ParseExpression += parseExp;
+            //g.sqlite.Aop.ParseExpression += parseExp;
 
             var sqddddl = g.sqlite.Select<TaskBuild>().ToSql(t => t.OptionsEntity04 == "1".TryTo<int>());
 
+            //var sqdddd2 = g.sqlite.Select<TaskBuild>().ToSql(t => t.OptionsEntity04 == t.NamespaceName.TryTo<int>());
+
             var sqksdkfjl = g.sqlite.Select<TaskBuild>()
                 .LeftJoin(a => a.Templates.Id2 == a.TemplatesId)
                 .LeftJoin(a => a.Parent.Id == a.Id)

FreeSql/Extensions/LambadaExpressionExtensions.cs

@@ -86,6 +86,13 @@ namespace System.Linq.Expressions
             var body = Expression.Not(exp.Body);
             return Expression.Lambda<Func<T, bool>>(body, candidateExpr);
         }
+
+        internal static bool IsParameter(this Expression exp)
+        {
+            var test = new TextParameterExpressionVisitor();
+            test.Visit(exp);
+            return test.Result;
+        }
     }
 
     internal class NewExpressionVisitor : ExpressionVisitor
@@ -102,4 +109,15 @@ namespace System.Linq.Expressions
         protected override Expression VisitParameter(ParameterExpression node) =>
             node == _oldParameter ? this._newParameter : node;
     }
+
+    internal class TextParameterExpressionVisitor : ExpressionVisitor
+    {
+        public bool Result { get; private set; }
+
+        protected override Expression VisitParameter(ParameterExpression node)
+        {
+            if (!Result) Result = true;
+            return node;
+        }
+    }
 }

FreeSql/Internal/CommonExpression.cs

@@ -837,6 +837,7 @@ namespace FreeSql.Internal
                     //}
                     var other3Exp = ExpressionLambdaToSqlOther(exp3, tsc);
                     if (string.IsNullOrEmpty(other3Exp) == false) return other3Exp;
+                    if (exp3.IsParameter() == false) return formatSql(Expression.Lambda(exp3).Compile().DynamicInvoke(), tsc.mapType);
                     throw new Exception($"未实现函数表达式 {exp3} 解析");
                 case ExpressionType.Parameter:
                 case ExpressionType.MemberAccess:
@@ -1097,7 +1098,11 @@ namespace FreeSql.Internal
                 case ExpressionType.Coalesce:
                     return _common.IsNull(ExpressionLambdaToSql(expBinary.Left, tsc), ExpressionLambdaToSql(expBinary.Right, tsc));
             }
-            if (dicExpressionOperator.TryGetValue(expBinary.NodeType, out var tryoper) == false) return "";
+            if (dicExpressionOperator.TryGetValue(expBinary.NodeType, out var tryoper) == false)
+            {
+                if (exp.IsParameter() == false) return formatSql(Expression.Lambda(exp).Compile().DynamicInvoke(), tsc.mapType);
+                return "";
+            }
             return ExpressionBinary(tryoper, expBinary.Left, expBinary.Right, tsc);
         }