标签：des class code java c ext
今天趁着看源代码的同时，记录学习的小知识。
一、String.Split 方法有6个重载函数：
1) public string[] Split(params char[]
separator)
2) public string[] Split(char[] separator, int count)
3) public
string[] Split(char[] separator, StringSplitOptions options)
4) public
string[] Split(string[] separator, StringSplitOptions options)
5) public
string[] Split(char[] separator, int count, StringSplitOptions options)
6)
public string[] Split(string[] separator, int count, StringSplitOptions
options)
下边我们通过一些实例来说明下怎么使用(以下string words = "1,2.3,,4";)：
1.
public string[] Split(params char[] separator)
返回值：
类型：System.String[]
separator.‘
data-guid="7b28a9466989f487697b9306b7388e52">一个数组，其元素包含此实例中的子字符串，这些子字符串由 separator 中的一个或多个字符分隔。 有关更多信息，请参见“备注”一节。
string[] split = words.Split(new Char[] { ‘,‘
});//返回:{"1","2.3","","4"}
string[] split = words.Split(new Char[] { ‘,‘, ‘.‘
});//返回:{"1","2","3","","4"}
2. public string[] Split(char[] separator, int
count)
string[] split = words.Split(new Char[] { ‘,‘, ‘.‘
}, 2);//返回:{"1","2.3,,4"}
string[] split = words.Split(new Char[] { ‘,‘, ‘.‘
}, 6);//返回:{"1","2","3","","4"}
3. public string[] Split(char[] separator,
StringSplitOptions options)
string[] split = words.Split(new Char[] { ‘,‘, ‘.‘
}, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2","3","4"}
不保留空元素
string[] split = words.Split(new Char[] { ‘,‘, ‘.‘ },
StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素
4. public string[] Split(string[] separator,
StringSplitOptions options)
string[] split = words.Split(new string[] { ",",
"." }, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2","3","4"}
不保留空元素
string[] split = words.Split(new string[] { ",", "." },
StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素
5. public string[] Split(char[] separator, int count,
StringSplitOptions options)
string[] split = words.Split(new Char[] { ‘,‘, ‘.‘
}, 2, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2.3,,4"}
不保留空元素
string[] split = words.Split(new Char[] { ‘,‘, ‘.‘ }, 6,
StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素
6. public string[] Split(string[] separator, int
count, StringSplitOptions options)
string[] split = words.Split(new string[] { ",",
"." }, 2, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2.3,,4"}
不保留空元素
string[] split = words.Split(new string[] { ",", "." }, 6,
StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素
需要注意的是没有重载函数public string[] Split(string[]
separator)，所以我们不能像VB.NET那样使用words.Split(",")，而只能使用words.Split(‘,‘)！很多人都很奇怪为什么把双引号改为单引号就可以了？看了上边的重载函数该知道答案了吧^_^
二、JSON.stringify 函数
将 JavaScript 转换为 JavaScript 对象表示法
(JSON) 字符串。
JSON.stringify(value [, replacer] [, space])
Converts a JavaScript value to a JavaScript Object Notation (JSON)
string.
Parameters:
- value
-
Required. A JavaScript value, usually an object or array, to be
converted.
- replacer
-
Optional. A function or array that transforms the results.
If replacer is a
function, JSON.stringify calls the
function, passing in the key and value of each member. The return value is
used instead of the original value. If the function returns undefined,
the member is excluded. The key for the root object is an empty string:
"".
If replacer is an array, only
members with key values in the array will be converted. The order in which the
members are converted is the same as the order of the keys in the array.
The replacer array is ignored when
the value argument is also an
array.
- space
-
Optional. Adds indentation, white space, and line break characters to the
return-value JSON text to make it easier to read.
If space is omitted, the
return-value text is generated without any extra white space.
If space is a number, the
return-value text is indented with the specified number of white spaces at
each level. If space is greater than
10, text is indented 10 spaces.
If space is a non-empty string,
such as ‘\t‘, the return-value text is indented with the characters in the
string at each level.
If space is a string that is
longer than 10 characters, the first 10 characters are use。
Example：
var contact = new Object();
contact.firstname = "Jesper";
contact.surname = "Aaberg";
contact.phone = ["555-0100", "555-0120"];
var memberfilter = new Array();
memberfilter[0] = "surname";
memberfilter[1] = "phone";
var jsonText = JSON.stringify(contact, memberfilter, "\t");
document.write(jsonText);
// Output:
// { "surname": "Aaberg", "phone": [ "555-0100", "555-0120" ] }
三、DeserializeObject 方法
public Object DeserializeObject(
string input
)
Json与数组,布布扣,bubuko.com
Json与数组
标签：des class code java c ext
原文地址：http://www.cnblogs.com/abc8023/p/3728749.html
