import org.apache.spark.sql.expressions.Window
val df = Seq(
(24, "Dev", "Sales", 30, "0"), (24, "Dev", "Sales", 40, "0"),
(24, "Dev", "Sales", 20, "0"), (24, "Dev", "Sales", 10, "0"),
(24, "Dev", "HR", 30, "0"), (24, "Dev", "HR", 20, "0"),
(24, "Dev", "Retail", 50, "0"), (24, "Dev", "Retail", 50, "0")
).toDF("job_id", "job_name", "department", "age", "old")
val w = Window.partitionBy($"job_id", $"job_name", $"department").orderBy($"job_id")
val dfOut = df.withColumn("sum_age", sum(col("age")).over(w))
.withColumn("old", when($"sum_age" === lit(100), lit("X")).otherwise($"old"))
.drop($"sum_age")
dfOut.show()
+------+--------+----------+---+---+
|job_id|job_name|department|age|old|
+------+--------+----------+---+---+
| 24| Dev| HR| 30| 0|
| 24| Dev| HR| 20| 0|
| 24| Dev| Retail| 50| X|
| 24| Dev| Retail| 50| X|
| 24| Dev| Sales| 30| X|
| 24| Dev| Sales| 40| X|
| 24| Dev| Sales| 20| X|
| 24| Dev| Sales| 10| X|
+------+--------+----------+---+---+
在iOS上不起作用，但在Android上却起作用，我正在使用xamarin。
这是我的代码：
CurrentItem启动此异常：
Shell.Current.CurrentItem = new MyPageTest();
有什么方法可以更改CurrentItem吗？
答案 0 :(得分：0)
解决了，我从项目中删除了Xamarin.forms，并再次从nuget中安装了它。并且此代码Shell.Current.CurrentItem = new MyPageTest();是正确的，但是没有得到我通过await Shell.Current.GoToAsync("//myshellapproot/shellcontentview");更改的正确结果