DomainPropertyValueHandler<TElement, TValue>.ValueChanging Method

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: TElement

  The element.

• oldValue
  Type: TValue

  The current value of the property.

• newValue
  Type: TValue

  The 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.

See Also

Reference

DomainPropertyValueHandler<TElement, TValue> Class

Microsoft.VisualStudio.Modeling Namespace