WPF comboBox selectedIndex = 0不起作用 [英] wpf comboBox selectedIndex=0 is not working

问题描述

.xaml

<ComboBox Grid.Row="0" Grid.Column="1" x:Name="cbx_srchResOrg" HorizontalAlignment="Stretch" Style="{DynamicResource ComboBoxStyle}"
                      ItemsSource="{Binding InfoCombo}" SelectedIndex="0" DisplayMemberPath="Dis_name" SelectedValuePath="Hide_id" SelectedItem="{Binding SelectInfo}"/>

这是我的源代码的一部分。
为什么 'SelectedIndex = 0' 不起作用？
我想在第一次选择[0]值作为默认值，但是在运行时它只是一个空框。除此之外没有其他错误。我该如何解决？

Here is a part of my source code. Why 'SelectedIndex=0' is not working? I want to select [0] value to default at first time, but it just empty box at run time. There are no errors except it. How can I fix it?

推荐答案

如Hej所说，您已将 SelectedItem 绑定到一个属性在视图模型中为 null 。

As Hej said, you have binded the SelectedItem with a property in your view model which was null.

您可以通过分配 SelectedItem来解决此问题在您的Viewmodel构造函数中

You can fix this by assigning the SelectedItem in your Viewmodel constructor

Public MyViewModel()
{
    SelectInfo = InfoCombo[0];
}

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