In this lesson, you will learn how to provide several customized variants of the same View, and allow an end-user to choose a desired View variant at runtime. Variants can be applied to both List Views and Detail Views. In this lesson, the Contact List View will be used. Two variants of this List View will be constructed via the Module Editor. To switch between these View variants, the special ChangeVariant Action will be used. To add this Action, the ViewVariants module will be referenced in the application.
In this lesson, you will learn more than how to provide custom variants of the same view, and allows the end user to select the desired view variant at run time. Variants may be applied simultaneously "list view" and "Detail View." In this lesson, you will use your contact list view. Two variants of the list view through the module configuration editor. To switch between these views variants, using special variables change operation. To add this operation, the reference to "Viewing variant" module in the application.
Note Note
Before proceeding, take a moment to review the following lessons.
Before proceeding, please take a moment to review the following courses.
- Inherit from the Business Class Library Class (XPO/EF)
- (XPO / EF) business class inherits from the class library
- Change Field Layout and Visibility in a List View
- Change the field layout and visibility in list view
- Add the View Variants module to your MySolution.Module project. Find the Module.cs (Module.vb) file in the MySolution.Module project displayed in the Solution Explorer, and double-click this file. The Module Designer will be invoked.
In the Toolbox, navigate to the DX.19.2: XAF Modules tab. Drag the ViewVariantsModule item from this tab to the Designer's Required Modules section.
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Add the "View variant" module to MySolution. Module project. MySolution.module items displayed in the Solution Explorer find Module.cs (Module.vb) file, and then double-click the file. The calling module designer.
In the toolbox, navigate to DX.19.2: XAF Modules tab. The "View Variants Module" project this tab and drag it to "designer required module" section.
- Rebuild your solution so that the changes made in the Module Designer are loaded to the Application Model.
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Invoke the Model Editor for the MySolution.Module project. Right-click the Views node and select Add... | ListView.
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Rebuild Solution to the module designer changes loaded into the application model.
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Call MySolution. Model Editor module project. Right-click on the "View" node and select "Add ..." | Listview.
For the new node, set the Id property to "Contact_ListView_AllColumns" and the ModelClass property to "Contact".
对于新节点，将 Id 属性设置为"Contact_ListView_AllColumns"，将 ModelClass 属性设置为"联系人"。
- Right-click the newly created node and select Generate content. Columns will be generated using information on the specified class (BOModel | Contact node) and its ancestors. Leave these columns as is. This List View will represent the complete variant for the Contact List View.
- 右键单击新创建的节点并选择"生成内容"。将使用指定类上的信息生成列（BOModel |联系节点）及其祖先。保持这些列不变。此列表视图将表示联系人列表视图的完整变体。
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Right-click the Views node and select Add... | ListView. For the new node, set the Id property to "Contact_ListView_Varied" and the ModelClass property to "Contact". Do not generate content for the new node.
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右键单击"查看"节点并选择"添加..." |Listview。对于新节点，将 Id 属性设置为"Contact_ListView_Varied"，将 ModelClass 属性设置为"联系人"。不要为新节点生成内容。
Expand the newly added Contact_ListView_Varied node, right-click the Variants child node and select Add... | Variant.
展开新添加的Contact_ListView_Varied节点，右键单击变体子节点并选择"添加..." |变异。
For the new node, set the View property to "Contact_ListView", and set the Id and Caption properties to "Few columns".
对于新节点，将 View 属性设置为"Contact_ListView"，并将 Id 和标题属性设置为"很少列"。
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Right-click the Variants node and select Add... | Variant. For the new node, set the View property to "Contact_ListView_AllColumns", and set the Id and Caption properties to "All columns".
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右键单击变体节点并选择"添加..." |变异。对于新节点，将 View 属性设置为"Contact_ListView_AllColumns"，并将 Id 和标题属性设置为"所有列"。
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Navigate to the NavigationItems | Items | Default | Items | Contact node. Its View property, specifying the View displayed when choosing the Contact navigation item, is "Contact_ListView" by default. Change it to "Contact_ListView_Varied".
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导航到导航项 |项目 |默认值 |项目 |联系节点。默认情况下，其 View 属性（指定选择"联系人"导航项时显示的视图）为"Contact_ListView"。将其更改为"Contact_ListView_Varied"。。
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Run the WinForms or ASP.NET application. Select the Contact item in the navigation control. For the displayed Contact List View, the ChangeVariant Action will be activated. This Action's items represent the view variants specified in the Model Editor.
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运行 WinForms 或ASP.NET应用程序。选择导航控件中的"联系人"项。对于显示的联系人列表视图，将激活"更改变量"操作。此操作的项表示模型编辑器中指定的视图变体。
Note 注意
You can use the Index property to specify the sort order of variants in the ChangeVariant Action drop-down list. Additionally, you can set the Current property of the Variants node to specify the default variant.
可以使用 Index 属性在"更改变体操作"下拉列表中指定变体的排序顺序。此外，还可以设置变体节点的"当前"属性以指定默认变体。
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Optionally, you can add view variants to the navigation control. For this purpose, invoke the Model Editor and set the GenerateRelatedViewVariantsGroup property of the NavigationItems node to true.
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或者，您可以将视图变体添加到导航控件。为此，调用模型编辑器，并将导航项节点的"生成相关视图VariantsGroup"属性设置为 true。
Note 注意
Ensure that the IModelChoiceActionItemChildItemsDisplayStyle.ChildItemsDisplayStyle property of the current navigation group node is set to List (see Change Style of Navigation Items). Otherwise, the view variants will not be added to the navigation control in the WinForms application.
确保 IModelChoiceActionItemItem 显示样式.子项显示当前导航组节点的样式属性设置为"列表"（请参阅更改导航项的样式）。否则，视图变体将不会添加到 WinForms 应用程序中的导航控件中。
As a result, the Contact navigation item will expose child items for each view variant.
因此，"联系人"导航项将公开每个视图变体的子项。
You can see the changes made in this lesson in the Model Editor invoked for the Model.DesignedDiffs.xafml file, located in the Main Demo | MainDemo.Module project. The MainDemo application is installed in %PUBLIC%\Documents\DevExpress Demos 19.2\Components\eXpressApp Framework\MainDemo by default. The ASP.NET version is available online at http://demos.devexpress.com/XAF/MainDemo/
Change the model editor you can model calls you made in this lesson. The main demonstration module project. The demo application is installed in the main % the PUBLIC% \ Documents \ DevExpress the Demos 19.2 \ Components \ eXpressApp Framework \ MainDemo by default. The Available Online at The ASP.NET Version IS AT http://demos.devexpress.com/XAF/MainDemo/
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