C#把日期转化成星期

显示效果：

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前台页面代码：

 <TextBlock Grid.Row="" x:Name="lb_txt_0" Text="选中日期" FontSize=""/>
 <TextBlock Grid.Row="" x:Name="lb_txt_1" Text="哪年" FontSize=""/>
 <TextBlock Grid.Row="" x:Name="lb_txt_2" Text="哪月" FontSize=""/>
 <TextBlock Grid.Row="" x:Name="lb_txt_3" Text="当月第几天" FontSize=""/>
 <TextBlock Grid.Row="" x:Name="lb_txt_4" Text="星期几" FontSize=""></TextBlock>
 <TextBlock Grid.Row="" x:Name="lb_txt_5" Text="当月总天数" FontSize=""></TextBlock>
 <TextBlock Grid.Row="" x:Name="lb_sum" Text="所有日期" FontSize=""></TextBlock>

后台代码：

             //指定日期
             DateTime selectTime = Convert.ToDateTime(rdp_schedule.SelectedValue);
             lb_txt_0.Text = "选中时间：" + selectTime;
             //哪年
             int year = selectTime.Year;
             lb_txt_1.Text = "哪年：" + year + "年";
             //哪月
             int month = selectTime.Month;
             lb_txt_2.Text = "哪月：" + month + "月";
             //第几天
             int day = selectTime.Day;
             lb_txt_3.Text = "当月第几天：" + day;

             // 星期几
             string week_EN = selectTime.DayOfWeek.ToString();//英文星期几
             string[] weekRemarks = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
             string week_CN = weekRemarks[Convert.ToInt16(selectTime.DayOfWeek)];//中文星期几
             lb_txt_4.Text = "星期几：" + week_EN + "[" + week_CN + "]";

             //一个月的总天数
             int totalDays = DateTime.DaysInMonth(year, month);
             lb_txt_5.Text = "该月天数：" + totalDays;

             //显示该月所有日期是星期几

             string timedays = "";
             for (int i = ; i <= totalDays; i++)
             {
                 string cols = i + "号/" + week_str[Convert.ToInt16(selectTime.AddDays(i - selectTime.Day).DayOfWeek)];
                 timedays += "该月第" + i + "天是" + selectTime.AddDays(i - selectTime.Day).DayOfWeek;
                 timedays += "  // "+week_str[Convert.ToInt16(selectTime.AddDays(i - selectTime.Day).DayOfWeek)] + "\n";
             }

             lb_sum.Text = timedays;