问题描述
我想要实现的目标就像将ItemIndex设置为-1一样，就像在普通ComboBox中一样，以便清除所选的项目。
What I tried to achieve is like setting ItemIndex to -1 as like in normal ComboBox, so that the selected item will be cleared.
DBLookupComboBox没有ItemIndex，并且Text属性是只读的。那么，如何清除所选项目？请帮忙。
There is no ItemIndex for DBLookupComboBox, and the Text property is read only. So how do I clear the selected item? Please help. Many thanks in advance.
PS：关闭并重新打开DBLookupComboBox-> ListSource数据集无济于事。
PS: Closing and reopening the DBLookupComboBox->ListSource DataSet does not help.
推荐答案
两种方式：
1）在运行时：DbLookupComboBox。 KeyValue：= null;
1) at runtime: DbLookupComboBox.KeyValue := null;
2）：在设计时：将DbLookupComboBox.NullValueKey属性设置为DEL（或在运行时将空值使用的任何键）
2) at design-time: set the DbLookupComboBox.NullValueKey property to DEL (or whatever key you want to use to null the value during runtime)
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