ASP. NET Status Management 2 (querystring)

The query string is the data appended to the URL (which is also commonly used)

For example:
Http://www.cnblogs.com/aierong/admin/EditPosts.aspx? Opt = ABC
Here? The later opt = 1 is the query string

This method can be used when data is transmitted to another page on one page.

Use the following method to receive data:
String STR = request. querystring ["Opt"]
In this way, STR is equal to "ABC".

Here we are passing English characters. If we want to pass Chinese characters, do we have to encode and reconcile them:
When sending the message, use the server. urlencode method to parse the response. When receiving the message, use server. urldecode to parse the response.

For example:
Transfer:
String url = "http://www.cnblogs.com/aierong/admin/EditPosts.aspx? Opt = "+ server. urlencode (" we ");
Response. Redirect (URL );
Receive:
String STR = server. urldecode (request. querystring ["Opt"]);
In this way, STR is equal to "we"

Of course, we have another easy-to-use method:

Modify globalization in Web. config
<Globalization
Requestencoding = "gb2312"
Responseencoding = "gb2312"
/>

Summary

The query string is the information appended at the end of the page url.

You can use a query string to submit data back to your page or another page through a URL.
Querying strings provides a simple but limited way to maintain certain State information.
For example, they are a simple way to transfer information from one page to another (for example, to another page that will process the product number ).

Advantages of using a query string
1. No server resource is required: the query string is contained in an HTTP request to a specific URL.
2. Extensive support: almost all browsers and client devices support using query strings to pass values.
3. Simple implementation: ASP. NET fully supports the string query method, including the method for reading the query string using the Params attribute of the httprequest object.

Disadvantages of using a query string
1. potential security risks
You can directly view the information in the query string on the browser user interface.
You can set this URL as a bookmark or send it to another user to pass the information in the query string through this URL.
If you are concerned about querying any sensitive data in a string, consider using a hidden field in a form (using post instead of a query string.

2. Limited Capacity
Some browsers and client devices have a URL length limit of 2083 characters.

 

 

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