ArcGIS Bug？ （脚本参数属性：从中获取）

Question

我目前在脚本参数

中的从获取属性时遇到问题

当我点击 Obtained From 面板时，它应该显示一个下拉列表（在这里我用来从数据集数据类型中获取东西）。

但现在我不能再这样做了

我甚至无法编辑我之前使用过的参数中所选的 。

我想知道是什么原因造成的？我需要快速解决它......

我认为这是在编辑脚本属性中的验证标签后发生的。

默认情况下应该显示如下

import arcpy
class ToolValidator(object):
  """Class for validating a tool's parameter values and controlling
  the behavior of the tool's dialog."""

  def __init__(self):
    """Setup arcpy and the list of tool parameters."""
    self.params = arcpy.GetParameterInfo()

  def initializeParameters(self):
    """Refine the properties of a tool's parameters.  This method is
    called when the tool is opened."""
    return

  def updateParameters(self):
    """Modify the values and properties of parameters before internal
    validation is performed.  This method is called whenever a parameter
    has been changed."""
    return

  def updateMessages(self):
    """Modify the messages created by internal validation for each tool
    parameter.  This method is called after internal validation."""
    return

然后我将其编辑为此，因此我可以从列

获取特定值

import arcpy
class ToolValidator(object):
  """Class for validating a tool's parameter values and controlling
  the behavior of the tool's dialog."""

  def __init__(self):
    """Setup arcpy and the list of tool parameters."""
    self.params = arcpy.GetParameterInfo()

  def initializeParameters(self):
    """Refine the properties of a tool's parameters.  This method is
    called when the tool is opened."""
    return

  def updateParameters(self):
    """Modify the values and properties of parameters before internal
    validation is performed.  This method is called whenever a parameter
    has been changed."""
    if self.params[1].value and self.params[2].value:
        self.params[3].filter.list = sorted({row[0] for row in arcpy.da.SearchCursor(self.params[1].value, self.params[2].value.value) if row[0]})

  def updateMessages(self):
    """Modify the messages created by internal validation for each tool
    parameter.  This method is called after internal validation."""
    return

Dunno如果触发了某些东西，我已经恢复了变化，但没有任何作用......我是否点击了其他内容？我不这么认为