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Purpose of Activator.CreateInstance with example?
...eInstance("MyAssembly", ClassName))
and can then do stuff like:
obj.A = 100;
That's its purpose. It also has many other overloads such as providing a Type instead of the class name in a string. Why you would have a problem like that is a different story. Here's some people who needed it:
Crea...
C# 4.0 optional out/ref arguments
.../ .. do something
if (outResult != null) {
outResult.Result = 100;
}
return value;
}
public void bar ()
{
string str = "bar";
string result;
OptionalOut<int> optional = new OptionalOut<int> ();
// example: call without the optional out parameter
...
How do I extract a sub-hash from a hash?
...
Ruby 2.5 added Hash#slice:
h = { a: 100, b: 200, c: 300 }
h.slice(:a) #=> {:a=>100}
h.slice(:b, :c, :d) #=> {:b=>200, :c=>300}
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...
Preview an image before it is uploaded
...g the file data in-memory):
<img id="blah" alt="your image" width="100" height="100" />
<input type="file"
onchange="document.getElementById('blah').src = window.URL.createObjectURL(this.files[0])">
Generated URL will be like:
blob:http%3A//localhost/7514bc74-65d4-4...
Where to store global constants in an iOS application?
...ew string everytime the defined value is used.
– jbat100
Jul 19 '13 at 12:32
1
@jbat100 I don't t...
How to create a SQL Server function to “join” multiple rows from a subquery into a single delimited
...vant code from Lance's link on sqlteam.com:
DECLARE @EmployeeList varchar(100)
SELECT @EmployeeList = COALESCE(@EmployeeList + ', ', '') +
CAST(EmpUniqueID AS varchar(5))
FROM SalesCallsEmployees
WHERE SalCal_UniqueID = 1
...
Set attributes from dictionary in python
... self.z="name"
if you want to set the attributes at once
d = {'x':100,'y':300,'z':"blah"}
a = A()
a.__dict__.update(d)
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How to group dataframe rows into list in pandas groupby?
... pd.DataFrame({'a': np.random.randint(0, 60, 600), 'b': [1, 2, 5, 5, 4, 6]*100})
def f(df):
keys, values = df.sort_values('a').values.T
ukeys, index = np.unique(keys, True)
arrays = np.split(values, index[1:])
df2 = pd.DataFrame({'a':ukeys, 'b':[list(a) for a in ...
Delete with Join in MySQL
...n a row, it is going to run that query inside IN. That means, if there are 100 rows that needs to be checked against that WHERE, that subquery is going to be run 100 times. Whereas a JOIN will only run ONCE. So, as your db gets bigger and bigger, that query is going to take longer and longer to fini...
How to avoid soft keyboard pushing up my layout? [duplicate]
...tRootView().getHeight() - (r.bottom - r.top);
if (heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...
//ok now we know the keyboard is up...
view_one.setVisibility(View.GONE);
view_two.setVisibility(View.GONE);
} else {
...