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="0" x:Name="lb_txt_0" Text="选中日期" FontSize="13"/>
<TextBlock Grid.Row="1" x:Name="lb_txt_1" Text="哪年" FontSize="13"/>
<TextBlock Grid.Row="2" x:Name="lb_txt_2" Text="哪月" FontSize="13"/>
<TextBlock Grid.Row="3" x:Name="lb_txt_3" Text="当月第几天" FontSize="13"/>
<TextBlock Grid.Row="4" x:Name="lb_txt_4" Text="星期几" FontSize="13"></TextBlock>
<TextBlock Grid.Row="5" x:Name="lb_txt_5" Text="当月总天数" FontSize="13"></TextBlock>
<TextBlock Grid.Row="6" x:Name="lb_sum" Text="所有日期" FontSize="13"></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 = 1; 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)] + "
";
            }

            lb_sum.Text = timedays;