public static SimpleOperationTarget Build(Expression expression)
{
IFastCollection rootFastCollection = null;
var operationTargetExpression = ExpressionNodeReplacer.ReplaceNode(expression, expr =>
{
if (expr != null &&
expr is FastCollectionReferenceExpression fastCollectionReferenceExpression)
{
if (rootFastCollection != null)
{
throw new ArgumentException("Multiple fast collections were found in expression tree when build operation target.");
}
rootFastCollection = fastCollectionReferenceExpression.FastCollection;
return(expr);
}
return(null);
});
if (rootFastCollection == null)
{
throw new ArgumentException($"No {nameof(FastCollectionReferenceExpression)} were found in expression tree when build operation target.");
}
return(new SimpleOperationTarget(operationTargetExpression, rootFastCollection));
}
public void ReplaceTest1()
{
Expression <Func <float, float> > expr = x => x * 2 + 3;
Expression <Func <float, float> > exprReplacedValid = x => x * 8 + 3;
var exprReplaced = ExpressionNodeReplacer.ReplaceNode(expr, expression =>
{
if (expression.NodeType == ExpressionType.Constant &&
((ConstantExpression)expression).Value is float val &&
val == 2)
{
return(Expression.Constant(8.0f));
}
return(null);
});