c#统计字符个数LINQ

 private void CountCharTest()
        {
            string strTest = "11111abcaabb!@??d";

            var query =
                from ch in strTest
                group ch by (int)ch into gr                            //分组条件以ASCII大小排序，因为想不出其它方法
                orderby gr.Key
                select gr;

            foreach (var groupText in query)
                Console.Write("-------------------{0,3} ", (char)groupText.Key);

            Console.WriteLine();
            foreach (var groupText in query)
            {
                Console.Write("-------------------{0,3}", groupText.Count());

            }
            foreach(var groupText in query)
            {
                if((char)groupText.Key=='1')
                {
                    Console.WriteLine("1的数量：-------------------{0,3}", groupText.Count());
                }
            }
            /*
             * ----------------------------abcdefg
“WaferSawRouteInspection.exe”(CLR v4.0.30319: WaferSawRouteInspection.exe): 已加载“D:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\Remote Debugger\x64\Runtime\Microsoft.VisualStudio.Debugger.Runtime.Desktop.dll”。已跳过加载符号。模块进行了优化，并且调试器选项“仅我的代码”已启用。
-------------------  ! -------------------  ? -------------------  @ -------------------  a -------------------  b -------------------  c -------------------  d 
-------------------  1-------------------  2-------------------  1-------------------  3-------------------  3-------------------  1-------------------  1

             * */

            Console.WriteLine();
            Console.WriteLine("中文显示-------------------abcdefg");
        }