Winforms .net 2.0：将文本框绑定到父属性
我有一个强类型的数据集，带有两个数据表：父级和子级，带有以您期望的方式链接它们的关系（例如父级有很多子级）。
在我的“孩子详细信息”表单上，我显示了有关当前孩子的大量信息，带有如下所示的绑定调用：
me.txtBirthDate.DataBindings.add(New Windows.Forms.Binding("Text", MyDataset, "Child.Birthdate"))
但我还想显示有关孩子父母的一些信息 - 例如父母的姓名。 我已经尝试过：
me.txtParentName.DataBindings.add(New Windows.Forms.Binding("Text", MyDataset, "Child.Parent.Name"))
和
me.txtParentName.DataBindings.add(New Windows.Forms.Binding("Text", MyDataset, "Parent.Name"))
但这都会导致空白文本框。
我当然可以将父属性直接放在子数据表上 用底层数据库表之间的联接结果填充它们，但如果可能的话，我想避免这种情况（我真正的应用程序只涉及几个父母，每个父母都有很多孩子，我不想成为移动了很多不必要的数据）。
那可能吗？
非常感谢！
-罗伊
I've got a strongly typed dset, w/two datatables: Parent and Child, w/a relation linking them in the way you'd expect (e.g. parent-has-many-children).
On my Child Detail form, I show lots of info on the current child, w/binding calls like so:
me.txtBirthDate.DataBindings.add(New Windows.Forms.Binding("Text", MyDataset, "Child.Birthdate"))
But I would also like to show some info on the child's parent--say, the parent's name. I have tried:
me.txtParentName.DataBindings.add(New Windows.Forms.Binding("Text", MyDataset, "Child.Parent.Name"))
and
me.txtParentName.DataBindings.add(New Windows.Forms.Binding("Text", MyDataset, "Parent.Name"))
But these both result in a blank text box.
I can of course put the parent properties directly on the Child DataTable & fill them w/the results of a join between the underlying db tables, but I'd like to avoid that if it's possible (my real app involves just a few Parents each w/many many Children & I'd like not to be moving so much unnecessary data).
Is that possible?
Many thanks!
-Roy
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我通常在
DataSet和控件之间使用BindingSource。 使用此方法时，如果我想要将控件绑定到不同表中的相关行，我会创建一个新的BindingSource，它指向相关行（他的DataSourcecode> 属性是原来的BindingSource，他的DataMember是父表），然后将其他控件绑定到第二个BindingSource。我通常在设计器视图中完成这一切，它只是在我进行过程中创建那些
BindingSource对象。希望有帮助。
I usually use a
BindingSourcebetween theDataSetand the controls. When using this approach, if I have controls that I want to bind to a related row from a different table, I create a newBindingSource, which points at the related row (hisDataSourceproperty is the originalBindingSource, hisDataMemberis the parent table), and then bind the other controls to the 2ndBindingSource.I usually do it all in the designer view, which just creates those
BindingSourceobjects as I go along.Hope that helps.