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WebRequest.Create Method (String)

Initializes a new WebRequest instance for the specified URI scheme.

Namespace: System.Net
Assembly: System (in system.dll)

public static WebRequest Create (
	string requestUriString
)
public static WebRequest Create (
	String requestUriString
)
public static function Create (
	requestUriString : String
) : WebRequest
Not applicable.

Parameters

requestUriString

The URI that identifies the Internet resource.

Return Value

A WebRequest descendant for the specific URI scheme.

Exception typeCondition

NotSupportedException

The request scheme specified in requestUriString has not been registered.

ArgumentNullException

requestUriString is a null reference (Nothing in Visual Basic).

SecurityException

The caller does not have permission to connect to the requested URI or a URI that the request is redirected to.

UriFormatException

The URI specified in requestUriString is not a valid URI.

The Create method returns a descendant of the WebRequest class determined at run time as the closest registered match for requestUri.

For example, when a URI beginning with http:// is passed in requestUri, an HttpWebRequest is returned by Create. If a URI beginning with file:// is passed instead, the Create method will return a FileWebRequest instance.

The .NET Framework includes support for the http://, https://, and file:// URI schemes. Custom WebRequest descendants to handle other requests are registered with the RegisterPrefix method.

The Create method uses the requestUriString parameter to create a Uri instance that it passes to the new WebRequest.

NoteNote:

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following example uses Create to instantiate an HttpWebRequest instance. A string representing the target URL is used as the constructor parameter.

Uri ourUri = new Uri(url);            

// Create a 'WebRequest' object with the specified url. 
WebRequest myWebRequest = WebRequest.Create(url); 

// Send the 'WebRequest' and wait for response.
WebResponse myWebResponse = myWebRequest.GetResponse(); 

// Use "ResponseUri" property to get the actual Uri from where the response was attained.
if (ourUri.Equals(myWebResponse.ResponseUri))
    Console.WriteLine("\nRequest Url : {0} was not redirected",url);   
else
    Console.WriteLine("\nRequest Url : {0} was redirected to {1}",url,myWebResponse.ResponseUri);   
// Release resources of response object.
myWebResponse.Close(); 


Uri ourUri = new Uri(url);
// Create a 'WebRequest' object with the specified url. 
WebRequest myWebRequest = WebRequest.Create(url);
// Send the 'WebRequest' and wait for response.
WebResponse myWebResponse = myWebRequest.GetResponse();
// Use "ResponseUri" property to get the actual Uri from where the 
// response was attained.
if (ourUri.Equals(myWebResponse.get_ResponseUri())) {
    Console.WriteLine("\nRequest Url : {0} was not redirected", url);
}
else {
    Console.WriteLine("\nRequest Url : {0} was redirected to {1}", 
        url, myWebResponse.get_ResponseUri());
} // Release resources of response object.
myWebResponse.Close();

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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