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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
.../proc 目录下包含了很多系统当前状态的参数，例如 /proc/sys/kernel/pid_max，/proc/sys/net/ipv4/ip_local_port_range 等等，从文件的名字大致可以猜出所限制的资源种类。由于该目录下涉及的文件众多，在此不一一介绍。有兴趣的读者可打开...
How To Set Text In An EditText
...ext(text);
Check it out EditText accept only String values if necessary convert it to string.
If int, double, long value, do:
String.value(value);
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Properly removing an Integer from a List
...in the second case '(Integer) n' can only be of type Integer. 'n' will be converted/boxed/unboxed as required or you will get a compiler errors if it cannot.
– Peter Lawrey
Dec 26 '10 at 14:53
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How to get enum value by string or int
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public static T GetEnumValue<T>(string str) where T : struct, IConvertible
{
Type enumType = typeof(T);
if (!enumType.IsEnum)
{
throw new Exception("T must be an Enumeration type.");
}
T val;
return Enum.TryParse<T>(st...
How do I export UIImage array as a movie?
...e
{
// This command grabs the next UIImage and converts it to a CGImage
buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:i] CGImage]];
}
if (buffer)
{
// Give the CGImage to the AVAssetWriter...
SQL: IF clause within WHERE clause
...rderNumber = CASE
WHEN (IsNumeric(@OrderNumber) = 1)
THEN CONVERT(INT, @OrderNumber)
ELSE -9999 -- Some numeric value that just cannot exist in the column
END
OR
FirstName LIKE CASE
WHEN (IsNumeric(@OrderNumber) = 0)
THEN '%' + @OrderNumber
...
How can I pad an integer with zeros on the left?
How do you left pad an int with zeros when converting to a String in java?
16 Answers
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LINQ query on a DataTable
...ensions
AsEnumerable() returns IEnumerable<DataRow>. If you need to convert IEnumerable<DataRow> to a DataTable, use the CopyToDataTable() extension.
Below is query with Lambda Expression,
var result = myDataTable
.AsEnumerable()
.Where(myRow => myRow.Field<int>("RowN...
How can I generate a list or array of sequential integers in Java?
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An IntInterval is an ImmutableIntList which extends IntList. It also has converter methods.
IntInterval ints = IntInterval.oneTo(10);
IntSet set = ints.toSet();
IntList list = ints.toList();
IntBag bag = ints.toBag();
An Interval and an IntInterval do not have the same equals contract.
Update ...
How do you round to 1 decimal place in Javascript?
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// fixed is always to 1 d.p.
// NOTE: .toFixed() returns a string!
// To convert back to number format
parseFloat(number.toFixed(2))
// 12.34
// but that will not retain any trailing zeros
// So, just make sure it is the last step before output,
// and use a number format during calculations!
E...