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# Friday, 23 March 2012

This time we update csharpxom to adjust it to C# 4.5. Additions are async modifier and await operator.

They are used to simplify asynchronous programming.

The following example from the msdn:

private async Task<byte[]> GetURLContentsAsync(string url)
{
  var content = new MemoryStream();
  var request = (HttpWebRequest)WebRequest.Create(url);

  using(var response = await request.GetResponseAsync())
  using(var responseStream = response.GetResponseStream())
  {
    await responseStream.CopyToAsync(content);
  }

  return content.ToArray();
}

looks like this in csharpxom:

<method name="GetURLContentsAsync" access="private" async="true">
  <returns>
    <type name="Task" namespace="System.Threading.Tasks">
      <type-arguments>
        <type name="byte" rank="1"/>
      </type-arguments>
    </type>
  </returns>
  <parameters>
    <parameter name="url">
      <type name="string"/>
    </parameter>
  </parameters>
  <block>
    <var name="content">
      <initialize>
        <new-object>
          <type name="MemoryStream" namespace="System.IO"/>
        </new-object>
      </initialize>
    </var>
    <var name="request">
      <initialize>
        <cast>
          <invoke>
            <static-method-ref name="Create">
              <type name="WebRequest" namespace="System.Net"/>
            </static-method-ref>
            <arguments>
              <var-ref name="url"/>
            </arguments>
          </invoke>
          <type name="HttpWebRequest" namespace="System.Net"/>
        </cast>
      </initialize>
    </var>

    <using>
      <resource>
        <var name="response">
          <initialize>
            <await>
              <invoke>
                <method-ref name="GetResponseAsync">
                  <var-ref name="request"/>
                </method-ref>
              </invoke>
            </await>
          </initialize>
        </var>
      </resource>
      <using>
        <resource>
          <var name="responseStream">
            <initialize>
              <invoke>
                <method-ref name="GetResponseStream">
                  <var-ref name="response"/>
                </method-ref>
              </invoke>
            </initialize>
          </var>
        </resource>
        <expression>
          <await>
            <invoke>
              <method-ref name="CopyToAsync">
                <var-ref name="responseStream"/>
              </method-ref>
              <arguments>
                <var-ref name="content"/>
              </arguments>
            </invoke>
          </await>
        </expression>
      </using>
    </using>

    <return>
      <invoke>
        <method-ref name="ToArray">
          <var-ref name="content"/>
        </method-ref>
      </invoke>
    </return>
  </block>
</method>

Friday, 23 March 2012 00:07:35 UTC  #    Comments [0] -
.NET | Announce | xslt
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