WebService calling through HTTP object programming in C #

1. WebService help class

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Public class webservicehelper
{
Public static string callservicebyget (string strurl)
{
// String strurl = "http: // localhost: 12074/service1.asmx/getproductprice? Productid = ";
// Strurl + = This. textbox1.text;
// Create an HTTP request
Httpwebrequest request = (httpwebrequest) webrequest. Create (strurl );
// Request. method = "get ";
Httpwebresponse response = (system. net. httpwebresponse) request. getresponse ();
Stream S = response. getresponsestream ();
// Convert to XML for processing
Xmltextreader reader = new xmltextreader (s );
Reader. movetocontent ();
String strvalue = reader. readinnerxml ();
Reader. Close ();
Strvalue = strvalue. Replace ("<", "<");
Strvalue = strvalue. Replace (">", "> ");
Return strvalue;
}
Public static string callservicebypost (string strurl, system. Collections. Specialized. stringdictionary parameters)
{
// String strurl = "http: // localhost: 12074/service1.asmx/getproductprice ";
// Create an HTTP request
Httpwebrequest request = (httpwebrequest) webrequest. Create (strurl );
// POST Request Method
Request. method = "Post ";
// Content type
Request. contenttype = "application/X-WWW-form-urlencoded ";
// Set parameters and perform URL Encoding
Stringbuilder codedstring = new stringbuilder ();
Foreach (string key in parameters. Keys)
{
Codedstring. append (httputility. urlencode (key ));
Codedstring. append ("= ");
Codedstring. append (httputility. urlencode (parameters [Key]);
Codedstring. append ("&");
}
String paraurlcoded = codedstring. Length = 0? String. Empty: codedstring. tostring (). substring (0, codedstring. Length-1 );
// String paraurlcoded = httputility. urlencode ("productid ");
// Paraurlcoded + = "=" + httputility. urlencode (this. textbox1.text );
Byte [] payload;
// Convert the URL-encoded string into bytes
Payload = system. Text. encoding. utf8.getbytes (paraurlcoded );
// Set the request contentlength
Request. contentlength = payload. length;
// Send a request to obtain the request stream
Stream writer = request. getrequeststream ();
// Write request parameters to the stream
Writer. Write (payload, 0, payload. Length );
// Close the request stream
Writer. Close ();
// Obtain the response stream
Httpwebresponse response = (httpwebresponse) request. getresponse ();
Stream S = response. getresponsestream ();
// Convert to XML for processing
Xmltextreader reader = new xmltextreader (s );
Reader. movetocontent ();
String strvalue = reader. readinnerxml ();
Reader. Close ();
Strvalue = strvalue. Replace ("<", "<");
Strvalue = strvalue. Replace (">", "> ");
Return strvalue;
}
}

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2. WebService Method

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/// <Summary>
/// Summary of service1
/// </Summary>
[WebService (namespace = "http://tempuri.org/")]
[Webservicebinding (conformsto = wsiprofiles. basicprofile1_1)]
[Toolboxitem (false)]
Public class service1: system. Web. Services. WebService
{

[Webmethod]
Public String helloworld1 ()
{
Return "Hello World ";
}

[Webmethod]
Public String helloworld2 (string P1, string P2)
{
Return string. Concat ("Hello World", P1, ",", P2 );
}
[Webmethod]
Public String helloworld3 (string datetime)
{
Return string. Concat ("Hello World", "Today is", datetime );
}
}

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3. Use the WebService help class to call the WebService Method

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// Call with two string Parameters
String url = "http: // localhost/bydif. WebService/service. asmx/helloworld2 ";
Stringdictionary parameters = new stringdictionary ();
Parameters. Add ("p1", "123 ");
Parameters. Add ("p2", "456 ");
String message = webservicehelper. callservicebypost (URL, parameters );
System. Console. writeline (Message );
// Call without Parameters
Url = "http: // localhost/bydif. WebService/service. asmx/helloworld1 ";
Parameters = new stringdictionary ();
Message = webservicehelper. callservicebypost (URL, parameters );
System. Console. writeline (Message );
// Call with a date string
Url = "http: // localhost/bydif. WebService/service. asmx/helloworld3 ";
Parameters = new stringdictionary ();
Parameters. Add ("datetime", system. datetime. Now. tow.datestring ());
Message = webservicehelper. callservicebypost (URL, parameters );
System. Console. writeline (Message );
System. Console. Read ();

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