大约有 30,000 项符合查询结果（耗时：0.0330秒） [XML]
What's the difference between lists and tuples?
...ples are heterogeneous data structures (i.e., their entries have different meanings), while lists are homogeneous sequences. Tuples have structure, lists have order.
Using this distinction makes code more explicit and understandable.
One example would be pairs of page and line number to reference...
ASP.NET MVC Html.DropDownList SelectedValue
...s,
Type: System.String
The name of the form field to return.
This just means the final html it generates will use that parameter as the name of the select input. But, it actually means more than that.
I guess the designer assumes that user will use a view model to display the dropdownlist, also...
Strangest language feature
...owever, the lesser known form (which really does work!) is:
10[a]
which means the same as the above.
share
edited Jan 3 '10 at 15:57
...
Are class names in CSS selectors case sensitive?
...n quirks mode for all browsers, classes and IDs are case-insensitive. This means case-mismatching selectors will always match. This behavior is consistent across all browsers for legacy reasons, and is mentioned in this article.
2 For what it's worth, Selectors level 4 contains a proposed syntax fo...
Is it better to return null or empty collection?
...think that "always" is a little excessive. While an empty collection might mean "0 items", returning Null could mean "no collection at all" - eg. if you are parsing HTML, looking for an <ul> with id="foo", <ul id="foo"></ul> could return empty collection; if there is no <ul> ...
Why use the INCLUDE clause when creating an index?
...DE columns are not key columns in the index, so they are not ordered.
This means it isn't really useful for predicates, sorting etc as I mentioned above. However, it may be useful if you have a residual lookup in a few rows from the key column(s)
Another MSDN article with a worked example
...
In CSS what is the difference between “.” and “#” when declaring a set of styles?
...y - an id selector is deemed to be more specific than class selector. This means that where styles conflict on an element, the ones defined with the more specific selector will override less specific selectors. For example, given <div id="sidebar" class="box"> any rules for #sidebar with overr...
How can I use NSError in my iPhone App?
...corresponding error code. End users will have no clue what error code 1002 means though, so now we need to implement some nice messages for each code.
For the error messages we have to keep localisation in mind (even if we don't implement localized messages right away). I've used the following appr...
Proper REST response for empty table?
...
@sempasha It depends on what you mean by GET /severalCoins. If you mandate that GET /severalCoins must return some coins then it shouldn’t be 200 because it’s not OK; server failed to provide what client want. For /singleCoin this is obvious because clie...
Can I use CASE statement in a JOIN condition?
...
what conditional join means? Each join (excluding cross) is a conditional. How this case is different from any other? Your sample has inner join with condition, as well as OPs query has join with condition.
– zerkms
...