This chapter goes into detail on the actual hooks in the metadata that accept expressions as input.
Values
When a property is assigned a value generator, it is considered to be a calculated propertyMetadata Calculated Properties. The methods for creating calculated properties build on the SetValueExpression() family of methods.
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propertyBuilder.ValueExpression("UtcNow")
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Default values
Any property can have a default value. Where possible, this value is mapped as the default value in the database. It is also used to initialize objects in memory.
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propertyBuilder.DefaultValueExpression("UtcToday")
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UI features
There are convenience methods for many common visual settings.
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For all of these methods, note that the "last call wins": any existing expression is replaced by the new call.
Visible
Set a constant visibility.
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propertyBuilder.IsVisible("Salary > 10000")
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Enabled
Set a constant enabled.
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property.IsEnabled(false) |
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property.IsEnabled("Salary > 10000")
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Read-only
Set a constant read-only.
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property.IsReadOnly("Salary > 10000")
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Instruction text
Set a constant read-only.
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