如何设置值到TableAdapter参数 [英] How To Set a Value to a TableAdapter Parameter

问题描述

我想要能够有两个ComboBoxes，其中一个是第二个的父级或所有者。这意味着每当我在第一个 ComboBox 中选择一个值时，第二个 ComboBox 将过滤它的结果，与 ComboBox 相关的值

I want to be able to have two ComboBoxes where one is the parent or owner of the second one. This means that whenever I select a value in the first ComboBox, the second ComboBox will filter it's results to display the corresponding values related to the first ComboBox.

例如：

注意：此示例已通过编程方式完成...我想了解如何使用Visual Studio的用户界面执行此操作

Note: This example has been completed programmatically... I want to figure out how to do it using the user interface of Visual Studio

我有一个数据集，其中包含两个数据表：

I have a dataset with two DataTables like so:

img src =https://i.stack.imgur.com/510Bh.pngalt =DataSet>

如您所见，我有一个参数在我的 BakerySubSectionsTableAdapter 中调用 @FK_BakerySection 。我想将其链接到 BakerySection的 PK_BakerySection 属性。

As you can see, I have a parameter in my BakerySubSectionsTableAdapter called @FK_BakerySection. I want to link that to the BakerySection's PK_BakerySection attribute.

以下是我当前的结果：

在我的TableAdapter中使用以下查询：

Using the following query in my TableAdapter:

所以...如何使用用户界面为参数设置值？

So ... How do we set a value to a parameter using the User Interface?

推荐答案

你在两个表之间添加一个 DataRelation （IIRC，你可以在DataSet设计器中这样做）。

It's easy if you add a DataRelation between your two tables (IIRC you can simply do this in the DataSet designer).

您只需要将第二个 ComboBox 的 DisplayMember 设置为 ParentTable.NameOfRelation.NameToDisplay 。

Then you only have to set the DisplayMember of your second ComboBox to ParentTable.NameOfRelation.NameToDisplay.

这是一个小而完整的例子：

Here's a small, complete example:

Dim data = New DataSet()
Dim section = data.Tables.Add("Section")
section.Columns.Add("ID", GetType(Integer))
section.Columns.Add("Name", GetType(String))

Dim sub_section = data.Tables.Add("SubSection")
sub_section.Columns.Add("ID", GetType(Integer))
sub_section.Columns.Add("Name", GetType(String))
sub_section.Columns.Add("Section", GetType(Integer))

section.Rows.Add(New Object() {1, "Foo"})
section.Rows.Add(New Object() {2, "Bar"})

sub_section.Rows.Add(New Object() {1, "Sub Foo", 1})
sub_section.Rows.Add(New Object() {2, "Another Sub Foo", 1})

sub_section.Rows.Add(New Object() {3, "Sub Bar", 2})
sub_section.Rows.Add(New Object() {4, "bar bar bar", 2})
sub_section.Rows.Add(New Object() {5, "more bar", 2})

section.ChildRelations.Add("SectionToSub", section.Columns("ID"), sub_section.Columns("Section"))

Dim f = New Form()
Dim c1 = New ComboBox() With { _
    .DataSource = data, _
    .DisplayMember = "Section.Name", _
    .ValueMember = "Id" _
}
Dim c2 = New ComboBox() With { _
    .DataSource = data, _
    .DisplayMember = "Section.SectionToSub.Name", _
    .ValueMember = "Id" _
}
Dim fl = New FlowLayoutPanel()
fl.Controls.Add(c1)
fl.Controls.Add(c2)
f.Controls.Add(fl)
f.ShowDialog()

只需确保您的 BakerySubSections 已完全填充（不需要参数）。

Just make sure your BakerySubSections is completly filled (no need for the parameter).

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