大约有 47,000 项符合查询结果（耗时：0.0513秒） [XML]
Nullable type as a generic parameter possible?
...val = reader[columnName];
return (val == DBNull.Value ? null : val);
}
Now you don't need the explicit type hinting on the RHS:
int? value = myDataReader.GetNullableValue("MyColumnName");
In fact, you don't need it anywhere!
var value = myDataReader.GetNullableValue("MyColumnName");
value will...
Error “can't use subversion command line client : svn” when opening android project checked out from
...udio cannot find the svn command because it's not on PATH, and it doesn't know where svn is installed.
One way to fix is to edit the PATH environment variable: add the directory that contains svn.exe. You will need to restart Android Studio to make it re-read the PATH variable.
Another way is to s...
What's the better (cleaner) way to ignore output in PowerShell? [closed]
...
I just did some tests of the four options that I know about.
Measure-Command {$(1..1000) | Out-Null}
TotalMilliseconds : 76.211
Measure-Command {[Void]$(1..1000)}
TotalMilliseconds : 0.217
Measure-Command {$(1..1000) > $null}
TotalMilliseconds : 0.2478
Measure-Comm...
When would I need a SecureString in .NET?
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After 11 years, this answer looks now to be the 'new' correct one. The links seem to be going stale but guidance from MS is: SecureString shouldn't be used
– Richard Morgan
Jul 5 '19 at 11:24
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How to format strings using printf() to get equal length in the output?
... of whatever length the two strings header1 and header2 may have.
I don't know if all implementations have the %n but Solaris and Linux do.
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foll...
what is the difference between GROUP BY and ORDER BY in sql
...-+-----------+----------+
GROUP BY: arrange identical data into groups.
Now, CUSTOMERS table has the following records with duplicate names:
+----+----------+-----+-----------+----------+
| ID | NAME | AGE | ADDRESS | SALARY |
+----+----------+-----+-----------+----------+
| 1 | Ramesh ...
How to loop through files matching wildcard in batch file
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Use a single '%' if typing this on the command line. I know the OP doesn't ask about the command line, but that's what I was searching for when this question came up at the top of my Google search. Others may appreciate this bit.
– Jason
Feb...
What is the proper way to format a multi-line dict in Python?
...iously, I couldn't find an "authoritative" reference either. I'll let you know if I do! Perhaps someone should contact Guido.
– FogleBird
Jun 17 '11 at 19:00
2
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Using SQL Server 2008 and SQL Server 2005 and date time
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I voted this down by mistake, undid that, but now can't do what I really wanted to do which is vote it up! Thank you for finding the issue. If I understand correctly, does the value change from 2005 to 2008 due to updating the model from the database, where the database ...
When should one use final for method parameters and local variables?
...that affects the immutability.)
Final static fields - Although I use enums now for many of the cases where I used to use static final fields.
Consider but use judiciously:
Final classes - Framework/API design is the only case where I consider it.
Final methods - Basically same as final classes. ...