大约有 16,000 项符合查询结果（耗时：0.0504秒） [XML]
C# : 'is' keyword and checking for Not
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I like this but it doesn't seem to work right when introducing a variable, even though it should. if (a is TextReader reader == false) "should" work, but it won't let you use the variable in the true path saying it might not have been initialized.
– Dave...
OS X Bash, 'watch' command
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The shells above will do the trick, and you could even convert them to an alias (you may need to wrap in a function to handle parameters):
alias myWatch='_() { while :; do clear; $2; sleep $1; done }; _'
Examples:
myWatch 1 ls ## Self-explanatory
myWatch 5 "ls -lF $HOME" ## Ever...
LAST_INSERT_ID() MySQL
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You could store the last insert id in a variable :
INSERT INTO table1 (title,userid) VALUES ('test', 1);
SET @last_id_in_table1 = LAST_INSERT_ID();
INSERT INTO table2 (parentid,otherid,userid) VALUES (@last_id_in_table1, 4, 1);
Or get the max id frm table1
INSERT INTO table1...
p vs puts in Ruby
... on a new line. Each given object
that isn’t a string or array will be converted by calling its to_s
method. If called without arguments, outputs a single newline.
let's try it on irb
# always newline in the end
>> puts # no arguments
=> nil # return nil and writes a newline
>...
How to add a new row to datagridview programmatically
...w row first as it will include the columns you've created at design-time.
int rowId = dataGridView1.Rows.Add();
// Grab the new row!
DataGridViewRow row = dataGridView1.Rows[rowId];
// Add the data
row.Cells["Column1"].Value = "Value1";
row.Cells["Column2"].Value = "Value2";
// And that's it! Qu...
Position a CSS background image x pixels from the right?
... @ValentinE that works for me too :-) I definitely saw this converted to 90% though - and I had cut and pasted this directly from chrome. unless there was a strange bug in a dev build of chrome I'm not sure why
– Simon_Weaver
Jul 29 '14 at 19:06
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jQuery scroll to element
...oView(). No use loading a ~100k library just to select an element and then convert it to regular JavaScript.
– Gavin
Jun 23 '14 at 18:59
63
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How to define an enum with string value?
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You can't - enum values have to be integral values. You can either use attributes to associate a string value with each enum value, or in this case if every separator is a single character you could just use the char value:
enum Separator
{
Comma = ',',
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Rails 2.3-style plugins and deprecation warnings running task in Heroku
...eare gives you a nice walkthrough link (found in the page @yuri linked) to convert my simple rails 2.3 plugins to 3.2. I liked this solution because it didn't just silence the warnings, it actually fixes them.
– Jeremiah
Oct 8 '13 at 17:24
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Array slices in C#
... use the Array.Copy static method. However I think the other answers have interpreted the intent correctly, another array is not required just an IEnumberable<byte> that over the first 41 bytes.
– AnthonyWJones
Jan 2 '09 at 11:09
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