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Covariance and contravariance real world example
...ariance in Generics on MSDN.
Classes:
public class Person
{
public string Name { get; set; }
}
public class Teacher : Person { }
public class MailingList
{
public void Add(IEnumerable<out Person> people) { ... }
}
public class School
{
public IEnumerable<Teacher> Get...
Convert Pandas column containing NaNs to dtype `int`
...
The OP wants a column of integers. Converting it to string does not meet the condition.
– Rishab Gupta
Feb 21 '19 at 1:33
1
...
Android Spinner : Avoid onItemSelected calls during initialization
...{
TextView textView = (TextView) findViewById(R.id.textView1);
String str = (String) parent.getItemAtPosition(pos);
textView.setText(str);
}
}
You can do it with boolean value and also by checking current and previous positions. See here
...
Download attachments using Java Mail
...MENT.equalsIgnoreCase(bodyPart.getDisposition()) &&
StringUtils.isBlank(bodyPart.getFileName())) {
continue; // dealing with attachments only
}
InputStream is = bodyPart.getInputStream();
// -- EDIT -- SECURITY ISSUE --
// do not do...
C# Create New T()
...;T> factory)
{ return factory(); }
and call it something like this:
string s = GetObject(() => "result");
You can use that to require or make use of available parameters, if needed.
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Is there a pretty print for PHP?
...(unless its second parameter is true), so you can't concatenate to another string. Use the following instead: function pr($var) { print '<pre>'; print_r($var); print '</pre>'; }
– Andrew Moore
Jul 23 '09 at 13:55
...
How to scroll up or down the page to an anchor using jQuery?
...
@Rob javascript does not have string interpolation, so using + with strings or vars concatenates them, like: "#some_anchor". Really, the second concat anchor_id + "" is not needed, I believe.
– onebree
Sep 26 '16 at ...
EF5: Cannot attach the file ‘{0}' as database '{1}'
...to use local server:
I changed the DataSource attribute in the connection string from:
Data Source=(LocalDb)\v11.0;blah
To:
Data Source=.\SQLEXPRESS;blah
Another solution is login to LocalDb via SQL Management Studio, and try to delete that database:
However it didn't work for me, when I t...
How to delete an object by id with entity framework
...Customer(int id)
{
using (var context = new Context())
{
const string query = "DELETE FROM [dbo].[Customers] WHERE [id]={0}";
var rows = context.Database.ExecuteSqlCommand(query,id);
// rows >= 1 - count of deleted rows,
// rows = 0 - nothing to delete.
}
}
...
android TextView: setting the background color dynamically doesn't work
...tBackGroundColor(), so I used android Color class to get int value of hex string and passed it to mentioned function. Everything worked.
This is example:
String myHexColor = "#CC2233";
TextView myView = (TextView) findViewById(R.id.myTextView);
myView.setBackGroundColor(Color.pasrsehexString(myHex...