WebClient Class
Important
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Provides common methods for sending data to and receiving data from a resource identified by a URI.
public ref class WebClient : System::ComponentModel::Component
public ref class WebClient sealed : System::ComponentModel::Component
public class WebClient : System.ComponentModel.Component
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class WebClient : System.ComponentModel.Component
[System.Runtime.InteropServices.ComVisible(true)]
public class WebClient : System.ComponentModel.Component
type WebClient = class
inherit Component
[<System.Runtime.InteropServices.ComVisible(true)>]
type WebClient = class
inherit Component
Public Class WebClient
Inherits Component
Public NotInheritable Class WebClient
Inherits Component
- Inheritance
- Attributes
The following code example takes the URI of a resource, retrieves it, and displays the response.
#using <System.dll>
using namespace System;
using namespace System::Net;
using namespace System::IO;
int main()
{
array<String^>^args = Environment::GetCommandLineArgs();
if ( args == nullptr || args->Length == 1 )
{
throw gcnew ApplicationException( "Specify the URI of the resource to retrieve." );
}
WebClient^ client = gcnew WebClient;
// Add a user agent header in case the
// requested URI contains a query.
client->Headers->Add( "user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)" );
Stream^ data = client->OpenRead( args[ 1 ] );
StreamReader^ reader = gcnew StreamReader( data );
String^ s = reader->ReadToEnd();
Console::WriteLine( s );
data->Close();
reader->Close();
delete client;
}
using System;
using System.Net;
using System.IO;
public class Test
{
public static void Main(string[] args)
{
if (args == null || args.Length == 0)
{
throw new ApplicationException("Specify the URI of the resource to retrieve.");
}
using WebClient client = new WebClient();
// Add a user agent header in case the
// requested URI contains a query.
client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
using Stream data = client.OpenRead(args[0]);
using StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();
Console.WriteLine(s);
}
}
Imports System.Net
Imports System.IO
Public Class Test
Public Shared Sub Main(args() As String)
If args Is Nothing OrElse args.Length = 0 Then
Throw New ApplicationException("Specify the URI of the resource to retrieve.")
End If
Using client As New WebClient()
' Add a user agent header in case the
' requested URI contains a query.
client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)")
Using data As Stream = client.OpenRead(args(0))
Using reader As New StreamReader(data)
Dim s As String = reader.ReadToEnd()
Console.WriteLine(s)
End Using
End Using
End Using
End Sub
End Class
Caution
WebRequest
, HttpWebRequest
, ServicePoint
, and WebClient
are obsolete, and you shouldn't use them for new development. Use HttpClient instead.
The WebClient class provides common methods for sending data to or receiving data from any local, intranet, or Internet resource identified by a URI.
The WebClient class uses the WebRequest class to provide access to resources. WebClient instances can access data with any WebRequest descendant registered with the WebRequest.RegisterPrefix method.
Note
By default, .NET Framework supports URIs that begin with http:
, https:
, ftp:
, and file:
scheme identifiers.
The following table describes WebClient methods for uploading data to a resource.
Method | Description |
---|---|
OpenWrite | Retrieves a Stream used to send data to the resource. |
OpenWriteAsync | Retrieves a Stream used to send data to the resource, without blocking the calling thread. |
UploadData | Sends a byte array to the resource and returns a Byte array containing any response. |
UploadDataAsync | Sends a Byte array to the resource, without blocking the calling thread. |
UploadFile | Sends a local file to the resource and returns a Byte array containing any response. |
UploadFileAsync | Sends a local file to the resource, without blocking the calling thread. |
UploadValues | Sends a NameValueCollection to the resource and returns a Byte array containing any response. |
UploadValuesAsync | Sends a NameValueCollection to the resource and returns a Byte array containing any response, without blocking the calling thread. |
UploadString | Sends a String to the resource and returns a String containing any response. |
UploadStringAsync | Sends a String to the resource, without blocking the calling thread. |
The following table describes WebClient methods for downloading data from a resource.
Method | Description |
---|---|
OpenRead | Returns the data from a resource as a Stream. |
OpenReadAsync | Returns the data from a resource, without blocking the calling thread. |
DownloadData | Downloads data from a resource and returns a Byte array. |
DownloadDataAsync | Downloads data from a resource and returns a Byte array, without blocking the calling thread. |
DownloadFile | Downloads data from a resource to a local file. |
DownloadFileAsync | Downloads data from a resource to a local file, without blocking the calling thread. |
DownloadString | Downloads a String from a resource and returns a String. |
DownloadStringAsync | Downloads a String from a resource, without blocking the calling thread. |
You can use the CancelAsync method to attempt to cancel asynchronous operations.
A WebClient instance does not send optional HTTP headers by default. If your request requires an optional header, you must add the header to the Headers collection. For example, to retain queries in the response, you must add a user-agent header. Also, servers may return 500 (Internal Server Error) if the user agent header is missing.
AllowAutoRedirect is set to true
in WebClient instances.
Derived classes should call the base class implementation of WebClient to ensure the derived class works as expected.
Web |
Obsolete.
Initializes a new instance of the WebClient class. |
Allow |
Obsolete.
Gets or sets a value that indicates whether to buffer the data read from the Internet resource for a WebClient instance. |
Allow |
Obsolete.
Gets or sets a value that indicates whether to buffer the data written to the Internet resource for a WebClient instance. |
Base |
Gets or sets the base URI for requests made by a WebClient. |
Cache |
Gets or sets the application's cache policy for any resources obtained by this WebClient instance using WebRequest objects. |
Can |
Gets a value indicating whether the component can raise an event. (Inherited from Component) |
Container |
Gets the IContainer that contains the Component. (Inherited from Component) |
Credentials |
Gets or sets the network credentials that are sent to the host and used to authenticate the request. |
Design |
Gets a value that indicates whether the Component is currently in design mode. (Inherited from Component) |
Encoding |
Gets or sets the Encoding used to upload and download strings. |
Events |
Gets the list of event handlers that are attached to this Component. (Inherited from Component) |
Headers |
Gets or sets a collection of header name/value pairs associated with the request. |
Is |
Gets whether a Web request is in progress. |
Proxy |
Gets or sets the proxy used by this WebClient object. |
Query |
Gets or sets a collection of query name/value pairs associated with the request. |
Response |
Gets a collection of header name/value pairs associated with the response. |
Site |
Gets or sets the ISite of the Component. (Inherited from Component) |
Use |
Gets or sets a Boolean value that controls whether the DefaultCredentials are sent with requests. |
Cancel |
Cancels a pending asynchronous operation. |
Create |
Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject) |
Dispose() |
Releases all resources used by the Component. (Inherited from Component) |
Dispose(Boolean) |
Releases the unmanaged resources used by the Component and optionally releases the managed resources. (Inherited from Component) |
Download |
Downloads the resource as a Byte array from the URI specified. |
Download |
Downloads the resource as a Byte array from the URI specified. |
Download |
Downloads the resource as a Byte array from the URI specified as an asynchronous operation. |
Download |
Downloads the resource as a Byte array from the URI specified as an asynchronous operation. |
Download |
Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object. |
Download |
Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object. |
Download |
Downloads the resource with the specified URI to a local file. |
Download |
Downloads the resource with the specified URI to a local file. |
Download |
Downloads, to a local file, the resource with the specified URI. This method does not block the calling thread. |
Download |
Downloads, to a local file, the resource with the specified URI. This method does not block the calling thread. |
Download |
Downloads the specified resource to a local file as an asynchronous operation using a task object. |
Download |
Downloads the specified resource to a local file as an asynchronous operation using a task object. |
Download |
Downloads the requested resource as a String. The resource to download is specified as a String containing the URI. |
Download |
Downloads the requested resource as a String. The resource to download is specified as a Uri. |
Download |
Downloads the specified string to the specified resource. This method does not block the calling thread. |
Download |
Downloads the resource specified as a Uri. This method does not block the calling thread. |
Download |
Downloads the resource as a String from the URI specified as an asynchronous operation using a task object. |
Download |
Downloads the resource as a String from the URI specified as an asynchronous operation using a task object. |
Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
Get |
Serves as the default hash function. (Inherited from Object) |
Get |
Obsolete.
Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject) |
Get |
Returns an object that represents a service provided by the Component or by its Container. (Inherited from Component) |
Get |
Gets the Type of the current instance. (Inherited from Object) |
Get |
Returns a WebRequest object for the specified resource. |
Get |
Returns the WebResponse for the specified WebRequest using the specified IAsyncResult. |
Get |
Returns the WebResponse for the specified WebRequest. |
Initialize |
Obsolete.
Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject) |
Memberwise |
Creates a shallow copy of the current Object. (Inherited from Object) |
Memberwise |
Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject) |
On |
Raises the DownloadDataCompleted event. |
On |
Raises the DownloadFileCompleted event. |
On |
Raises the DownloadProgressChanged event. |
On |
Raises the DownloadStringCompleted event. |
On |
Raises the OpenReadCompleted event. |
On |
Raises the OpenWriteCompleted event. |
On |
Raises the UploadDataCompleted event. |
On |
Raises the UploadFileCompleted event. |
On |
Raises the UploadProgressChanged event. |
On |
Raises the UploadStringCompleted event. |
On |
Raises the UploadValuesCompleted event. |
On |
Obsolete.
Raises the WriteStreamClosed event. |
Open |
Opens a readable stream for the data downloaded from a resource with the URI specified as a String. |
Open |
Opens a readable stream for the data downloaded from a resource with the URI specified as a Uri. |
Open |
Opens a readable stream containing the specified resource. This method does not block the calling thread. |
Open |
Opens a readable stream containing the specified resource. This method does not block the calling thread. |
Open |
Opens a readable stream containing the specified resource as an asynchronous operation using a task object. |
Open |
Opens a readable stream containing the specified resource as an asynchronous operation using a task object. |
Open |
Opens a stream for writing data to the specified resource, using the specified method. |
Open |
Opens a stream for writing data to the specified resource. |
Open |
Opens a stream for writing data to the specified resource, by using the specified method. |
Open |
Opens a stream for writing data to the specified resource. |
Open |
Opens a stream for writing data to the specified resource, using the specified method. This method does not block the calling thread. |
Open |
Opens a stream for writing data to the specified resource. This method does not block the calling thread. |
Open |
Opens a stream for writing data to the specified resource. This method does not block the calling thread. |
Open |
Opens a stream for writing data to the specified resource as an asynchronous operation using a task object. |
Open |
Opens a stream for writing data to the specified resource as an asynchronous operation using a task object. |
Open |
Opens a stream for writing data to the specified resource as an asynchronous operation using a task object. |
Open |
Opens a stream for writing data to the specified resource as an asynchronous operation using a task object. |
To |
Returns a String containing the name of the Component, if any. This method should not be overridden. (Inherited from Component) |
Upload |
Uploads a data buffer to a resource identified by a URI. |
Upload |
Uploads a data buffer to the specified resource, using the specified method. |
Upload |
Uploads a data buffer to a resource identified by a URI. |
Upload |
Uploads a data buffer to the specified resource, using the specified method. |
Upload |
Uploads a data buffer to a resource identified by a URI, using the POST method. This method does not block the calling thread. |
Upload |
Uploads a data buffer to a resource identified by a URI, using the specified method and identifying token. |
Upload |
Uploads a data buffer to a resource identified by a URI, using the specified method. This method does not block the calling thread. |
Upload |
Uploads a data buffer that contains a Byte array to the URI specified as an asynchronous operation using a task object. |
Upload |
Uploads a data buffer that contains a Byte array to the URI specified as an asynchronous operation using a task object. |
Upload |
Uploads a data buffer that contains a Byte array to the URI specified as an asynchronous operation using a task object. |
Upload |
Uploads a data buffer that contains a Byte array to the URI specified as an asynchronous operation using a task object. |
Upload |
Uploads the specified local file to the specified resource, using the specified method. |
Upload |
Uploads the specified local file to a resource with the specified URI. |
Upload |
Uploads the specified local file to the specified resource, using the specified method. |
Upload |
Uploads the specified local file to a resource with the specified URI. |
Upload |
Uploads the specified local file to the specified resource, using the POST method. This method does not block the calling thread. |
Upload |
Uploads the specified local file to the specified resource, using the POST method. This method does not block the calling thread. |
Upload |
Uploads the specified local file to the specified resource, using the POST method. This method does not block the calling thread. |
Upload |
Uploads the specified local file to a resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified local file to a resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified local file to a resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified local file to a resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified string to the specified resource, using the specified method. |
Upload |
Uploads the specified string to the specified resource, using the POST method. |
Upload |
Uploads the specified string to the specified resource, using the specified method. |
Upload |
Uploads the specified string to the specified resource, using the POST method. |
Upload |
Uploads the specified string to the specified resource. This method does not block the calling thread. |
Upload |
Uploads the specified string to the specified resource. This method does not block the calling thread. |
Upload |
Uploads the specified string to the specified resource. This method does not block the calling thread. |
Upload |
Uploads the specified string to the specified resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified string to the specified resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified string to the specified resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified string to the specified resource as an asynchronous operation using a task object. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI, using the specified method. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI, using the specified method. |
Upload |
Uploads the data in the specified name/value collection to the resource identified by the specified URI. This method does not block the calling thread. |
Upload |
Uploads the data in the specified name/value collection to the resource identified by the specified URI, using the specified method. This method does not block the calling thread, and allows the caller to pass an object to the method that is invoked when the operation completes. |
Upload |
Uploads the data in the specified name/value collection to the resource identified by the specified URI, using the specified method. This method does not block the calling thread. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI as an asynchronous operation using a task object. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI as an asynchronous operation using a task object. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI as an asynchronous operation using a task object. |
Upload |
Uploads the specified name/value collection to the resource identified by the specified URI as an asynchronous operation using a task object. |
Disposed |
Occurs when the component is disposed by a call to the Dispose() method. (Inherited from Component) |
Download |
Occurs when an asynchronous data download operation completes. |
Download |
Occurs when an asynchronous file download operation completes. |
Download |
Occurs when an asynchronous download operation successfully transfers some or all of the data. |
Download |
Occurs when an asynchronous resource-download operation completes. |
Open |
Occurs when an asynchronous operation to open a stream containing a resource completes. |
Open |
Occurs when an asynchronous operation to open a stream to write data to a resource completes. |
Upload |
Occurs when an asynchronous data-upload operation completes. |
Upload |
Occurs when an asynchronous file-upload operation completes. |
Upload |
Occurs when an asynchronous upload operation successfully transfers some or all of the data. |
Upload |
Occurs when an asynchronous string-upload operation completes. |
Upload |
Occurs when an asynchronous upload of a name/value collection completes. |
Write |
Obsolete.
Occurs when an asynchronous operation to write data to a resource using a write stream is closed. |
Product | Versions |
---|---|
.NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
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