Update exp to sql

Src/Asp.Net/SqlSugar/ExpressionsToSql/Subquery/Items/SubWhere.cs

@@ -55,7 +55,7 @@ namespace SqlSugar
             }
             if (Regex.IsMatch(result, regex))
             {
-                result = "WHERE " + this.Context.Parameters.First(it => it.ParameterName == Regex.Match(result, regex).Groups[1].Value).Value;
+                result = "WHERE " + GetValue(result, regex);
                 return result;
             }
 
@@ -64,5 +64,10 @@ namespace SqlSugar
                 result = result.Replace(selfParameterName, SubTools.GetSubReplace(this.Context));
             return result;
         }
+
+        private object GetValue(string result, string regex)
+        {
+            return this.Context.Parameters.First(it => it.ParameterName == Regex.Match(result, regex).Groups[1].Value).Value;
+        }
     }
 }