大约有 10,700 项符合查询结果（耗时：0.0336秒） [XML]
Getting unique items from a list [duplicate]
...s old, but it shows up easily on Google and you're wrong (at least, as of .NET 4 - I haven't checked in older versions). yourList.Distinct().ToList() performs one enumeration, new HashSet<T>(yourList).ToList() performs two. And the implementations of HashSet and Distinct's internal Set class a...
ApartmentState for dummies
...
COM is the grand father of .NET. They had pretty lofty goals with it, one of the things that COM does but .NET completely skips is providing threading guarantees for a class. A COM class can publish what kind of threading requirements it has. And the...
Swapping column values in MySQL
...a temporary variable. Thanks to Antony from the comments of http://beerpla.net/2009/02/17/swapping-column-values-in-mysql/ for the "IS NOT NULL" tweak. Without it, the query works unpredictably. See the table schema at the end of the post. This method doesn't swap the values if one of them is NULL. ...
Good or bad practice? Initializing objects in getter
....com/en-us/library/dd997286(v=vs.100).aspx. If you have older versions of .NET, you have to use the code pattern illustrated in the question. This code pattern has become so common that Microsoft saw fit to include a class in the latest .NET libraries to make it easier to implement the pattern. In a...
The source was not found, but some or all event logs could not be searched
I am getting the following exception. I have given full control to Asp.net account on Eventlogs in Registry edit.
10 Answer...
Why are mutable structs “evil”?
...rom property setters) which mutate "this" are somewhat evil, only because .net doesn't provide a means of distinguishing them from methods which do not. Struct methods that do not mutate "this" should be invokable even on read-only structs without any need for defensive copying. Methods which do m...
HttpWebRequest using Basic authentication
...tions what to check ? It works when I do " webRequest.Credentials = new NetworkCredential(UserID, Password);" .
– RollerCosta
Jun 24 '19 at 5:29
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Check if list is empty in C# [closed]
...late which is shown if the datasource is empty. This is an approach in ASP.NET:
<emptydatarowstyle backcolor="LightBlue" forecolor="Red"/>
<emptydatatemplate>
<asp:image id="NoDataErrorImg"
imageurl="~/images/NoDataError.jpg" runat="server"/>
No Data Found!
</em...
CSS overflow-x: visible; and overflow-y: hidden; causing scrollbar issue
...s for you.
UPDATE - New Solution:
Original problem -> http://jsfiddle.net/xMddf/1/
(Even if I use overflow-y: visible it becomes "auto" and actually "scroll".)
#content {
height: 100px;
width: 200px;
overflow-x: hidden;
overflow-y: visible;
}
The new solution -> http://jsf...
Why do we always prefer using parameters in SQL statements?
...ployee would then be deleted.
In your case, it looks like you're using .NET. Using parameters is as easy as:
C#
string sql = "SELECT empSalary from employee where salary = @salary";
using (SqlConnection connection = new SqlConnection(/* connection info */))
using (SqlCommand command = new SqlC...