private bool TryGetCompiledExpressionRootAtDesignTime(Activity expression, Activity target, out ICompiledExpressionRoot compiledExpressionRoot, out int exprId)
{
exprId = -1;
compiledExpressionRoot = null;
if (!CompiledExpressionInvoker.TryGetCompiledExpressionRoot(expression, target, out compiledExpressionRoot) ||
!CanExecuteExpression(compiledExpressionRoot, out exprId))
{
return(FindCompiledExpressionRoot(out exprId, out compiledExpressionRoot));
}
return(true);
}
private bool TryGetCurrentCompiledExpressionRoot(ActivityContext activityContext, out ICompiledExpressionRoot compiledExpressionRoot, out int expressionId)
{
var current = activityContext.CurrentInstance;
while (current != null && current.Activity != this.metadataRoot)
{
if (CompiledExpressionInvoker.TryGetCompiledExpressionRoot(current.Activity, true, out var currentCompiledExpressionRoot))
{
if (CanExecuteExpression(currentCompiledExpressionRoot, out expressionId))
{
compiledExpressionRoot = currentCompiledExpressionRoot;
return(true);
}
}
current = current.Parent;
}
compiledExpressionRoot = null;
expressionId = -1;
return(false);
}
private bool FindCompiledExpressionRoot(out int exprId, out ICompiledExpressionRoot compiledExpressionRoot)
{
var root = this.metadata.CurrentActivity.Parent;
while (root != null)
{
if (CompiledExpressionInvoker.TryGetCompiledExpressionRoot(metadata.CurrentActivity, root, out var currentCompiledExpressionRoot))
{
if (CanExecuteExpression(currentCompiledExpressionRoot, out exprId))
{
compiledExpressionRoot = currentCompiledExpressionRoot;
return(true);
}
}
root = root.Parent;
}
exprId = -1;
compiledExpressionRoot = null;
return(false);
}