public static WhenFormulaChangesBuilder <TProp> When <TProp>(this DependencyEngine engine, Expression <Func <TProp> > sourceFunction, string expressionId = null)
{
var parameterExpression = Expression.Parameter(typeof(TProp));
var wrapped = Expression.Lambda <Func <TProp, TProp> >(sourceFunction.Body, new[] { parameterExpression });
return(new WhenFormulaChangesBuilder <TProp>(wrapped, expressionId, engine));
}
public AssignPropertyBuilder(DependencyEngine engine, Expression <Func <T> > targetMemberExpression, string nodeId)
{
var memberExpression = targetMemberExpression.Body as MemberExpression;
if (memberExpression == null)
{
throw new ArgumentException("Expression must be a member (field/property) accessor, for example foo.Bar", "targetMemberExpression");
}
var propertyInfo = memberExpression.Member as PropertyInfo;
var fieldInfo = memberExpression.Member as FieldInfo;
if (propertyInfo == null && fieldInfo == null)
{
throw new ArgumentException("Only fields and properties are supported", "targetMemberExpression");
}
if (propertyInfo != null && !propertyInfo.CanWrite)
{
throw new ArgumentException("Property must be writable", "targetMemberExpression");
}
if (fieldInfo != null && fieldInfo.IsInitOnly)
{
throw new ArgumentException("Field cannot be read-only", "targetMemberExpression");
}
this.engine = engine;
targetMemberDefinition = CreateMemberDefinition(targetMemberExpression, nodeId, true, true);
}
public WhenFormulaChangesBuilder(Expression <Func <T, T> > sourceFunction, string nodeId, DependencyEngine dependencyEngine)
{
this.dependencyEngine = dependencyEngine;
if (sourceFunction.IsWritable())
{
sourceDefinition = CreateMemberDefinition(sourceFunction, nodeId, true, true);
}
else
{
sourceDefinition = CreateFormulaDefinition(sourceFunction, nodeId, true);
}
}
public static AssignPropertyBuilder <TProp> Assign <TProp>(this DependencyEngine engine, Expression <Func <TProp> > targetMemberExpression, string expressionId = null)
{
return(new AssignPropertyBuilder <TProp>(engine, targetMemberExpression, expressionId));
}
