我正在使用Monotouch.Dialog,并遇到此错误:
The RootElement's Group is null or is not a RadioGroup
我正在使用的代码如下,我添加了注释,告诉你变量的状态:
var groupSortChoices = new RadioGroup("S", Extensions.GetValues<PeopleDirectoryGroupSortEnum>().IndexOfItem (i => i.Element == Extensions.GetValue<PeopleDirectoryGroupSortEnum>(Options.GroupAndSort)).Value);
// new RadioGroup("S", 0)
var nameDisplayChoices = new RadioGroup("N", Extensions.GetValues<PeopleDirectoryNameDisplayEnum>().IndexOfItem (i => i.Element == Extensions.GetValue<PeopleDirectoryNameDisplayEnum>(Options.NameDisplay)).Value);
// new RadioGroup("N", 0)
var gsElems = Extensions.GetValues<PeopleDirectoryGroupSortEnum>()
.Select(e => new RadioElement(e, "S"))
.ToArray();
// String[4] array of this enum's values
var ndElems = Extensions.GetValues<PeopleDirectoryNameDisplayEnum>()
.Select(e => new RadioElement(e, "N"))
.ToArray();
// String[2] array of this enum's values
groupSortElement = new RootElement("Grouping and Sorting", groupSortChoices)
{
new Section("Grouping and Sorting")
{
gsElems
},
};
nameDisplayElement = new RootElement("Name Display", nameDisplayChoices)
{
new Section("Name Display")
{
ndElems
}
};
var root = new RootElement("Directory Options")
{
groupSortElement,
nameDisplayElement
};
this.Root = root;
我打破了这段代码以尝试调试它。该错误肯定来自groupSortElement和nameDisplayElement。我尝试初始化我的组而不使用“S”和“N”仍然得到相同的错误。我之前已经做了几次这样的事情,并且不能为我的生活弄清楚我做错了什么。有任何想法吗?两个RadioGroups不为null,如果我注释掉groupSortElement和nameDisplayElement,则会出现一个空视图,告诉我它与这些元素有关。
答案 0 :(得分:4)
我明白了。我试图将RootElements直接添加到RootElement,而不是RootElement包含的部分。