WPF ComboBox显示所选值? [英] WPF ComboBox display selected value?

问题描述

在显示UI之前，将从数据库中检索数据，并将这些数据显示在屏幕上.

Before displaying the UI, data will be retrieved from database and these data to be displayed on screen.

现在我有一个包含2个字段的屏幕.一个文本框和一个 combobox .

Now I have a screen with 2 fields. One textbox and one combobox.

文本框的值被绑定，如下所示:

Value of textbox being bind as below:

<TextBox Text="{Binding [someViewModel].person.name, Mode=TwoWay, 
ValidatesOnDataErrors=True, ValidatesOnExceptions=True,
ValidatesOnNotifyDataErrors=True}"

现在，我有一个ComboBox，它可以从数据库中获取值列表，黄色，绿色，蓝色以下是我绑定 ComboBox 的方法:

Now I have a ComboBox that get the list of value from database, says Yellow, Green, Blue Below is the way I bind ComboBox:

<ComboBox IsSynchronizedWithCurrentItem="True" 
ItemSource="{Binding [someViewModel].ColorList}" 
DisplayMemberPath="ColorName" SelectedValuePath="ColorID" 
SelectedValue="{Binding [someViewModel].person.ColorID}"

现在的问题是，当我加载页面时，默认选择的值将基于 [someViewModel] .person.ColorID ，但是显示为空.ComboBox中有值.当我调试它时， [someViewModel] .person.ColorID 中有值，但是它不会显示出来?

My problem now is when I load the page, the default selected value will be based on [someViewModel].person.ColorID but it's showing empty instead. There are values in the ComboBox. When I debug it, there are value in [someViewModel].person.ColorID but it just wouldn't show?

当我将值从黄色更改为绿色时，该值也会反映到 [someViewModel] .person.ColorID 符合我的需求

When I change the value from Yellow to Green, the value will be reflected to [someViewModel].person.ColorID as well which fits what I need

推荐答案

您的Color类是否具有ColorID属性，或者只是ID?

Has your Color class ColorID property, or just Id?

如果是这样: SelectedValuePath ="Id"

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