MaterialDesignInXAML/MaterialDesignInXamlToolkit

Unable to cast object of type 'Mocks.MaterialDesignDemo_ColorToolViewModel_2_47133230' to type 'System.Windows.Media.SolidColorBrush'.

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#1,411 opened on Sep 11, 2019

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 (7 comments) (0 reactions) (0 assignees)C# (3,500 forks)batch import
Hacktoberfestdemo appgood first issueup-for-grabs

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Description

Hi

After downloading the source code, I installed .netcore3.0 and .net 4.7.2. After running with vs2019, the demo can run normally but the WPF view page is prompted to report an error. The screenshot is as follows. What is the reason? Is there a library missing?

Error message

Unable to cast object of type 'Mocks.MaterialDesignDemo_ColorToolViewModel_2_47133230' to type 'System.Windows.Media.SolidColorBrush'. MaterialDesignDemo ColorTool.xaml 1

image

Contributor guide

Research direction
The error suggests a binding issue in ColorTool.xaml where a mock object is being cast to SolidColorBrush. Check the XAML markup and ensure the DataTemplate or converter returns the correct type. Look at the ColorToolViewModel and its associated views. The issue was reported in 2019 and has 7 comments but no resolution. Investigate if the problem persists in the current codebase and if any changes have been made to the relevant files.
Tech stack
csharp
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
C# basicsWPF XAML basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30