Add demo

Src/Asp.NetCore2/SqlSeverTest/Demo/Demo1_Queryable.cs

@@ -97,6 +97,15 @@ namespace OrmTest
                      .Select(o => o.Id))
                      .OrderBy("id desc")
                      .ToPageList(1, 10);
+
+            var methodInfo = typeof(UnitTool).GetMethod("GetName");
+
+            var list8 = db.Queryable<Order>()
+              .Select(it => new
+              {
+                  n = it.Name,
+                  name = SqlFunc.OnlyInSelectConvertToString(it.Name, methodInfo)
+              }).ToList();
             Console.WriteLine("#### Examples End ####");
         }
 

Src/Asp.NetCore2/SqlSeverTest/UnitTest/UnitTool.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OrmTest
+{
+    internal class UnitTool
+    {
+        public static string GetName(string name) 
+        {
+            return "name" + 111;
+        }
+    }
+}