c# - 如何使用tabControl在XAML中使用两个ViewModels代码

Question

我是WPF的新手，请帮助我。我有两个 View 模型1.ItemCategoryViewModel和2.TypeViewmodel这两个 View 模型来自不同的两个表

<tabcontrol>
    <TabItem x:Name="itemtype" Header="ItemType" IsSelected="True" MinHeight="10"> 
        <Grid/>
    </tabitem> 
    <TabItem Header="ItemCategory"  Margin="-1,0" MinHeight="10">
        <grid/>
    </tabitem>
</tabcontrol>

在xaml.cs代码中，我想同时使用两个 View 模型。

TypeViewmodel povm = new TypeViewmodel();

ItemCategoryViewModel tcvm=new ItemCategoryViewModel();

public PurchaseOrderEntry()
{
    InitializeComponent();
    this.DataContext = povm;
    this.DataContext = tcvm;
    txtPONumber.Focus();

    if (povm.FocusMoveTo == null)
        povm.FocusMoveTo = new Action(() => this.FieldNumberToChange());

    if (povm.FocusMoveByTabId == null)
        povm.FocusMoveByTabId = new Action(() =>this.GoToFocusByTabId());

    if (povm.OpenDialogue == null)
        povm.OpenDialogue = new Action<string>(this.OpenDialogue);

    if (tcvm.FocusMoveTo == null)
        tcvm.FocusMoveTo = new Action(() => this.FieldNumberToChange());

    if (tcvm.FocusMoveByTabId == null)
        tcvm.FocusMoveByTabId = new Action(() =>this.GoToFocusByTabId());

    if (tcvm.OpenDialogue == null)
        tcvm.OpenDialogue = new Action<string>(this.OpenDialogue);
}

当我仅执行一个选项卡项目时，另一个项目无法正常工作.viewmodel覆盖。我该如何解决，请帮助我

Answer 1

替换此代码

  this.DataContext = povm;
    this.DataContext = tcvm;

用这个代码

 this.itemtype.DataContext = povm;
 this.ItemCategory.DataContext = tcvm;