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How do you create an asynchronous method in C#?
...s = new TaskCompletionSource<T>();
ThreadPool.QueueUserWorkItem(_ =>
{
try
{
T result = function();
tcs.SetResult(result);
}
catch(Exception exc) { tcs.SetException(exc); }
});
return tcs.Task;
}
Fro...
How to check file MIME type with javascript before upload?
...adAsDataURL(blob);
}
// Add more from http://en.wikipedia.org/wiki/List_of_file_signatures
function mimeType(headerString) {
switch (headerString) {
case "89504e47":
type = "image/png";
break;
case "47494638":
type = "image/gif";
break;
case "ffd8ff...
Copy file remotely with PowerShell
...
@klm_ Can you please explain what you mean?
– FastTrack
Dec 8 '16 at 15:46
add a comment
...
Rails formatting date
...
Use
Model.created_at.strftime("%FT%T")
where,
%F - The ISO 8601 date format (%Y-%m-%d)
%T - 24-hour time (%H:%M:%S)
Following are some of the frequently used useful list of Date and Time formats that you could specify in strftime metho...
Catching java.lang.OutOfMemoryError?
...
In OpenJdk1.7.0_40, I don't get any error or exception when I run this code. Even I changed the MEGABYTE to GIGABYTE (1024*1024*1024). Is that because of optimizer removes the variable 'byte[] bytes' as it is not used in the rest of the cod...
How to pass a class type as a function parameter
...lass: AnyClass = type(of: self)
Swift 2.x
let myClass: AnyClass = object_getClass(self)
and you can pass it as paramater later, if you'd like.
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Tools for JPEG optimization? [closed]
...anFromGermany is right. See reviews here: download.cnet.com/RIOT/3000-12511_4-10911908.html#summaryList
– RNickMcCandless
Mar 17 '14 at 17:08
...
C++11 range based loop: get item by value or reference to const
...se, but in the way it is written):
long long SafePop(std::vector<uint32_t>& v)
{
auto const& cv = v;
long long n = -1;
if (!cv.empty())
{
n = cv.back();
v.pop_back();
}
return n;
}
Here, the author has created a const reference to v to use for...
data.table vs dplyr: can one do something well the other can't or does poorly?
..., keyby = .(x,y)][DT2][, z := z*mul][]
# dplyr equivalent
DF1 %>% group_by(x, y) %>% summarise(z = sum(z)) %>%
right_join(DF2) %>% mutate(z = z * mul)
2) do it all in one go (using by = .EACHI feature):
DT1[DT2, list(z=sum(z) * mul), by = .EACHI]
What is the advantage?
We do...
What should I do if the current ASP.NET session is null?
...s doing initialization logic during startup, for example on the Application_Start event or by using a static constructor, Session state might not be available. It all boils down to whether there is a current request and AcquireRequestState has been run.
Also, should the client have disabled cookies,...