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ArgumentException when TabViewItem.Header is null or empty string

See original GitHub issue

Describe the bug ArgumentException when a TabViewItem with empty or null Header displayed.

Steps to reproduce the bug

<TabView>
    <TabViewItem Header="">
        <TextBlock Text="123" />
    <TabViewItem>
<TabView>

<TabView>
    <TabViewItem Header="{x:Null}">
        <TextBlock Text="123" />
    <TabViewItem>
<TabView>

<TabView>
    <TabViewItem>
        <TextBlock Text="123" />
    <TabViewItem>
<TabView>

Does not reproduce if TabViewItem.Content is not set, or set to a string instead of a control.

Version Info

NuGet package version:

Microsoft.UI.Xaml 2.4.3 Microsoft.UI.Xaml.2.5.0-prerelease.200923002 Microsoft.WinUI 3.0.0-preview2.200713.0

Windows app type:

UWP	Win32
Yes	Yes

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2020 Update (19041)
November 2019 Update (18363)	Yes
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Issue Analytics

State:
Created 3 years ago
Comments:13 (12 by maintainers)

Top GitHub Comments

1reaction

StephenLPeterscommented, Sep 25, 2020

In teaching tip we ended up doing a content presenter who’s content is a border, who’s content is template bound to the property. that way we could put the foreground on the parent content presenter. I think that same model would work here?

0reactions

StephenLPeterscommented, Oct 1, 2020

That, unfortunately, makes sense. I think you are right and setting the content presenter’s content from code behind makes sense… 😦