大约有 30,000 项符合查询结果（耗时：0.0521秒） [XML]
Converting XDocument to XmlDocument and vice versa
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Why does ToXDocument() contain call to MoveToContent()? This looks liek it would skip over any content ahead of the document element, e.g. any comments and processing instructions at the top of the XML doc.
– redcalx
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String.IsNullOrWhiteSpace in LINQ Expression
...ion method to make use of it. It requires no special config to use, simply call WhereEx instead of Where.
public class QueryVisitor: ExpressionVisitor
{
protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (node.Method.IsStatic && node.Method.Name ==...
When to use Common Table Expression (CTE)
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Interesting fact about CTE. I always wondered why NEWID() in the CTE changes when the CTE is referenced more than once. select top 100 * into #tmp from master..spt_values order by 1,2,3,4 select A.number, COUNT(*) from #tmp A inner join #tmp B ON A.number = B.number+1 group by...
How to create composite primary key in SQL Server 2008
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CREATE TABLE UserGroup
(
[User_Id] INT NOT NULL,
[Group_Id] INT NOT NULL
CONSTRAINT PK_UserGroup PRIMARY KEY NONCLUSTERED ([User_Id], [Group_Id])
)
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Using regular expression in css?
I have an html page with divs that have id (s) of the form s1 , s2 and so on.
8 Answers
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Node.js Mongoose.js string to ObjectId function
Is there a function to turn a string into an objectId in node using mongoose? The schema specifies that something is an ObjectId, but when it is saved from a string, mongo tells me it is still just a string. The _id of the object, for instance, is displayed as objectId("blah") .
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is node.js' console.log asynchronous?
...sole.error() are blocking. They do not return until the underlying system calls have succeeded.
Yes, it is possible for a program to exit before everything written to stdout has been flushed. process.exit() will terminate node immediately, even if there are still queued writes to stdout. You sho...
Select Multiple Fields from List in Linq
... in your code:
var cats = listObject
.Select(i => new { i.category_id, i.category_name })
.Distinct()
.OrderByDescending(i => i.category_name)
.ToArray();
Since you (apparently) need to store it for later use, you could use the GroupBy operator:
Data[] cats = listObject
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Get a CSS value with JavaScript
...the CSS properties that were defined as inline in that element (programmatically, or defined in the style attribute of the element), you should get the computed style.
Is not so easy to do it in a cross-browser way, IE has its own way, through the element.currentStyle property, and the DOM Level 2 ...
How to use null in switch
...ing with String and enum types. Perhaps the enum implementation relies on calling ordinal() behind the scenes (though even so, why not treat null as having an 'ordinal' of -1?), and the String version does something using intern() and pointer-comparison (or otherwise relies upon something that stri...