From 00fa46087d268c08380afc34202aa911a68adf4d Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Sat, 1 Apr 2023 18:39:24 +0800
Subject: [PATCH] Synchronization code

---
 .../ExpressionsToSql/DbMethods/DefaultDbMethod.cs   | 13 ++++++++++---
 .../SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs  |  1 +
 .../MethodCallExpressionResolve_Helper.cs           |  9 ++++++++-
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
index 6a1a902df..f164bad08 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
@@ -370,9 +370,16 @@ namespace SqlSugar
 
         public virtual string MappingColumn(MethodCallExpressionModel model)
         {
-            var parameter = model.Args[0];
-            var parameter1 = model.Args[1];
-            return string.Format("{0}", parameter1.MemberValue);
+            if (model.Args.Count == 1)
+            {
+                return string.Format("{0}", model.Args[0].MemberValue);
+            }
+            else
+            {
+                var parameter = model.Args[0];
+                var parameter1 = model.Args[1];
+                return string.Format("{0}", parameter1.MemberValue);
+            }
         }
 
         public virtual string IsNull(MethodCallExpressionModel model)
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
index 299e14647..e7f289f0a 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
@@ -241,6 +241,7 @@ namespace SqlSugar
         public static int AggregateCount<TResult>(TResult thisValue) { throw new NotSupportedException("Can only be used in expressions"); }
         public static int AggregateDistinctCount<TResult>(TResult thisValue) { throw new NotSupportedException("Can only be used in expressions"); }
         public static TResult MappingColumn<TResult>(TResult type,string newColumnName) { throw new NotSupportedException("Can only be used in expressions"); }
+        public static TResult MappingColumn<TResult>(string newColumnName) { throw new NotSupportedException("Can only be used in expressions"); }
         /// <summary>
         ///Example: new NewT(){name=SqlFunc.GetSelfAndAutoFill(it)}  Generated SQL   it.*
         /// </summary>
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs
index ae8b1817f..1c2c80846 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs
@@ -675,7 +675,14 @@ namespace SqlSugar
                         var mappingColumnResult = this.Context.DbMehtods.MappingColumn(model);
                         var isValid = model.Args[0].IsMember && model.Args[1].IsMember == false;
                         //Check.Exception(!isValid, "SqlFunc.MappingColumn parameters error, The property name on the left, string value on the right");
-                        this.Context.Parameters.RemoveAll(it => it.ParameterName == model.Args[1].MemberName.ObjToString());
+                        if (model.Args.Count > 1)
+                        {
+                            this.Context.Parameters.RemoveAll(it => it.ParameterName == model.Args[1].MemberName.ObjToString());
+                        }
+                        else 
+                        {
+                            this.Context.Parameters.RemoveAll(it => it.ParameterName == model.Args[0].MemberName.ObjToString());
+                        }
                         if (mappingColumnResult == "")
                         {
                             return model.Args[1].MemberName.ObjToString().TrimStart('\'').TrimEnd('\'');