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Performs validation and raises the OnValueChanging event.
Namespace: Microsoft.VisualStudio.Modeling
Assembly: Microsoft.VisualStudio.Modeling.Sdk.12.0 (in Microsoft.VisualStudio.Modeling.Sdk.12.0.dll)
Syntax
'Declaration
Protected Sub ValueChanging ( _
element As TElement, _
oldValue As TValue, _
newValue As TValue _
)
protected void ValueChanging(
TElement element,
TValue oldValue,
TValue newValue
)
protected:
void ValueChanging(
TElement element,
TValue oldValue,
TValue newValue
)
member ValueChanging :
element:'TElement *
oldValue:'TValue *
newValue:'TValue -> unit
protected function ValueChanging(
element : TElement,
oldValue : TValue,
newValue : TValue
)
Parameters
element
Type: TElementThe element.
oldValue
Type: TValueThe current value of the property.
newValue
Type: TValueThe new value of the property.
Exceptions
| Exception | Condition |
|---|---|
| InvalidOperationException | Operation is invoked outside of modeling transaction scope or there was an attempt to set a calculated property. |
Remarks
This method is called by SetValue before the value is changed.
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.