HttpRequest.Params Property

HttpRequest.Params Property

Remarks

Name-value pairs are added to the collection in the following order:

1. Query-string parameters.

2. Form fields.

3. Cookies.

4. Server variables.

 

In ASP.NET, the Request.Params property provides access to a collection of name-value pairs that represent the data submitted to the server from a variety of sources, including:

1. Query string parameters: These are key-value pairs appended to the URL after the question mark (?). For example, https://www.example.com/search?q=keyword contains a query string parameter named q with the value keyword.

2. Form data: This is the data submitted from HTML forms using the POST or GET methods. Form data is typically encoded in a format like name=value&name2=value2.

3. Cookies: These are small pieces of data stored on the client's computer that the server can access and modify. Cookies are often used to store user preferences or authentication information.

4. Server variables: These are variables provided by the web server that contain information about the request, such as the client's IP address, the request method, and the HTTP headers.

The Request.Params property is a NameValueCollection object, which means it can be accessed using either a string key or an integer index. To access a value using a key, you can use the indexer notation:

C#

string value = Request.Params["key"];

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To access a value using an integer index, you can use the GetValues() method:

C#

string[] values = Request.Params.GetValues(index);

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The Request.Params property is a convenient way to access all of the data submitted to the server in a single collection.

 

However, it is important to be aware of the different sources of data and to use the appropriate access method for each source.

 

For example, if you want to access a query string parameter, you should use the Request.QueryString property instead of the Request.Params property.

Here is an example of how to access a query string parameter using the Request.QueryString property:

C#

string keyword = Request.QueryString["q"];

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Here is an example of how to access a form field value using the Request.Form property:

C#

string name = Request.Form["name"];

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Here is an example of how to access a cookie value using the Request.Cookies property:

C#

string username = Request.Cookies["username"].Value;

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Here is an example of how to access a server variable using the Request.ServerVariables property:

C#

string remoteAddress = Request.ServerVariables["REMOTE_ADDR"];

 

作者:Chuck Lu    GitHub