WebClient Constructor

Definition

Namespace:

System.Net

Assemblies:

netstandard.dll, System.Net.WebClient.dll

Source:

WebClient.cs

Caution

WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.

Initializes a new instance of the WebClient class.

C#

[System.Obsolete("WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.", DiagnosticId="SYSLIB0014", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public WebClient();

Attributes

ObsoleteAttribute

Examples

The following code example creates a WebClient instance and then uses it to download data from a server and display it on the system console, to download data from a server and write it to a file, and to upload form values to a server and receive the response.

C#

try {
    
// Download the data to a buffer.
    WebClient client = new WebClient();

Byte[] pageData = client.DownloadData("http://www.contoso.com");
string pageHtml = Encoding.ASCII.GetString(pageData);
Console.WriteLine(pageHtml);

// Download the data to a file.
        client.DownloadFile("http://www.contoso.com", "page.htm");

// Upload some form post values.
NameValueCollection form = new NameValueCollection();		
form.Add("MyName", "MyValue");		
Byte[] responseData = client.UploadValues("http://www.contoso.com/form.aspx", form);		
}
catch (WebException webEx) {
    Console.WriteLine(webEx.ToString());
    if(webEx.Status == WebExceptionStatus.ConnectFailure) {
        Console.WriteLine("Are you behind a firewall?  If so, go through the proxy server.");
    }
}

Remarks

The parameterless constructor creates a new instance of the WebClient class. The default HTTP method is GET. The default FTP method is RETR. The default Encoding is Default. The default value of AllowAutoRedirect is true.

Applies to