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What is the format in VS 2022 for "Custom Expression"?

Nicholas Piazza 536 Reputation points
2024-07-04T17:40:34.44+00:00

In working on a WPF application in Visual Studio 2022, if you expand the property window for Brush, you get the following display.

VS XAML Properties

If you click the small down arrow in the Editor tab, you get the following menu:

VS XAML Properties Color Editor Dropdown Menu

If you select Custom Expression..., you get a TextBox labeled "Custom Expression". What exactly is the format for entering a "custom expression". Can you give an example of one for setting a Brush color?

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  1. Hui Liu-MSFT 47,256 Reputation points Microsoft Vendor
    2024-07-05T03:03:23.32+00:00

    Hi,@Nicholas Piazza. Welcome to Microsoft Q&A.

    For custom expression under the color option, just enter the color.

    User's image

    The numbers 1 and 2 in the following picture represent the solid color brush and gradient brush respectively. Currently it is in the solid color brush options and the color is AliceBlue.

    SolidColorBrush custom Expression : input lightpink (The background color will change from aliceblue to lightpink)

    User's image

    GradientBrush custom Expression : input color you want((The background color will become the color you enter with the gradient brush)

    User's image

    1.Linear gradient 2.Radial gradient3.reserve gradient stops

    For the custom expression under the Offset option, just enter a number of type double.

    User's image

    You could set these options in the Properties window to help you set the color, and you can click the color card to directly select a custom color.

    Note: When entering custom expressions in the Visual Studio Property Window, you might need to ensure the expression is syntactically correct and does not break the XAML parser. If you encounter any issues, consider setting the property directly in the XAML file instead of using the Property Window's custom expression feature.

    If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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